Transmission driving device

A transmission driving device that is capable of preventing displacement of a shift operation member or a select operation member in a case where there is reverse input in the shift operation member or the select operation member by inhibiting rotation of a rotation member which is released from an input shaft. When an input shaft and a first rotor are connected, the first electromagnetic coil is an excitation state and a second electromagnetic coil is in a non-excitation state. In this state, a second magnetic ring is not attracted to the side of the second electromagnetic coil, a seventh facing, which is fixed to the second magnetic ring, and an eighth facing are engaged with each other, and a second rotor and a casing are connected to each other. In a connection state of the second rotor and the casing, the second rotor cannot be rotated.

TECHNICAL FIELD

The present invention relates to a transmission driving device.

BACKGROUND ART

Conventionally, a transmission driving device of an automated control manual transmission (Automated Manual Transmission) in which a manual transmission clutch is automated has been known.

For example, in a transmission driving device of PTL 1, two motors such as a motor for a shift operation and a motor for a select operation are provided, and an operation similar to a manual operation is performed using these motors.

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

Technical Problem

In PTL 1, since two electric motors are used, there is a concern that costs will be increased.

Therefore, the inventors have considered using a single electric motor to realize both a shift operation and a select operation. For example, a clutch mechanism can be adopted in order to selectively transmit the rotating torque of the electric motor to one of a shift operation member for the shift operation or a select operation member for the select operation. The clutch mechanism includes a first electromagnetic clutch that connects a first rotation member, which is connected to the shift operation member, to an input shaft, and releases the first rotation member from the input shaft, and a second electromagnetic clutch that connects a second rotation member, which is connected to the select operation member, to the input shaft, and releases the second rotation member from the input shaft. When the first electromagnetic clutch is in an excitation state, the second electromagnetic clutch is set to be in a non-excitation state, and when the second electromagnetic clutch is in an excitation state, the first electromagnetic clutch is set to be in a non-excitation state.

When the first electromagnetic clutch is connected, the second rotation member is released from the input shaft. In this case, if there is reverse input in the select operation member, the second rotation member is rotated, and there is a concern that the select operation member may be operated (moved) regardless of the control of a controller. In addition, similarly, if there is reverse input in the shift operation member in a state where the first rotation member is released from the input shaft, the first rotation member is rotated, and there is a concern that the shift operation member may be operated (moved) regardless of the control of the controller.

Therefore, an object of the present invention is to provide a transmission driving device capable of preventing displacement of the shift operation member or the select operation member in a case where there is a reverse input in the shift operation member or the select operation member by inhibiting rotation of the rotation member which is released from the input shaft.

Solution to Problem

According to a first aspect of the present invention, there is provided a transmission driving device (1;100) comprising: a casing (5;107); a shift operation member (8;101) which is configured to perform a shift operation; a select operation member (12;101) which is configured to perform a select operation; an input shaft (30;110) to which a rotating torque of an electric motor (9;103) is to be input; a first rotation member (31;112) which is configured to transmit the rotating torque to one of the shift operation member and the select operation member; a second rotation member (32;111) which is configured to transmit the rotating torque to the other of the shift operation member and the select operation member; a clutch mechanism (33;113) which includes: a first clutch (34;117) that is configured to connect the first rotation member to the input shaft and that is configured to release the first rotation member from the input shaft; and a second clutch (35;116) that is configured to connect the second rotation member to the input shaft and that is configured to release the second rotation member from the input shaft, the clutch mechanism which is configured to selectively transmit the rotating torque of the input shaft to the first rotation member or the second rotation member; a casing side engagement portion (60,75;169) which is provided on the casing or which is provided on a fixing member (171) that is provided to be fixed to the casing; and a first engagement portion (56;170) which is integrally and rotatably provided in the first rotation member, and which can be engaged with the casing side engagement portion, wherein the first clutch is configured of an electromagnetic clutch that includes a first electromagnetic coil (36;119), and the first engagement portion is attracted to a side of the first electromagnetic coil and the first engagement portion is engaged with the casing side engagement portion in a non-excitation state of the first electromagnetic coil in the first clutch, and an engagement between the first engagement portion and the casing side engagement portion is released in an excitation state of the first electromagnetic coil.

In addition, the reference numerals in brackets indicate the corresponding components or the like in embodiments described below. However, the claims are not limited to the embodiments. Hereinafter, this point is similarly applied.

According to this configuration, the first engagement portion that can be engaged with the casing side engagement portion is provided so as to be integrally rotated with the first rotation member. In the non-excitation state of the first electromagnetic coil, the first engagement portion is engaged with the casing side engagement portion. Moreover, in the excitation state of the first electromagnetic coil, the first engagement portion is attracted to the first electromagnetic coil, and the engagement between the first engagement portion and the casing side engagement portion is released.

When the input shaft and the first rotation member are connected to each other, since the first electromagnetic coil of the first clutch is in the excitation state, the engagement between the first engagement portion and the casing side engagement portion is released. That is, the first rotation member is released from the casing. Thereby, if the rotating torque is transmitted from the input shaft to the first rotation member, the first rotation member is integrally rotated with the input shaft.

On the other hand, when the input shaft and the second rotation member are connected to each other, since the first electromagnetic coil of the first clutch is in the non-excitation state, the first engagement portion and the casing side engagement portion are engaged with each other, and the first rotation member is connected to the casing. In the connection state of the first rotation member and the casing, the first rotation member cannot be rotated. Therefore, the first rotation member, which is in the state in which the first rotation member is released from the input shaft, cannot be rotated, and thereby, in a case where there is reverse input in the shift operation member or the select operation member, displacement (movement or rotation) of the operation member can be prevented.

Moreover, since the connection and the release of the first rotation member with respect to the casing are performed using the first electromagnetic coil of the first clutch, it is not necessary to provide a dedicated magnetic circuit for performing the connection and the release of the first rotation member with respect to the casing, and thereby, reduction in the costs can be improved.

According to a transmission driving device of a second aspect of the present invention, the transmission driving device may further comprise a magnetic ring (55,70) which can be integrally rotated with the first rotation member and which is disposed so as to be moved in an axial direction between the first electromagnetic coil and the casing side engagement portion, and the first engagement portion may be provided so as to be integrally moved with the magnetic ring.

According to this configuration, the magnetic ring is disposed between the first electromagnetic coil and the casing side engagement portion. That is, the first electromagnetic coil is disposed at a side opposite to the casing side engagement portion with respect to the magnetic ring.

In the non-excitation state of the first electromagnetic coil, the magnetic ring is not attracted to the side of the first electromagnetic coil, and thereby, the first engagement portion is not moved. Therefore, an engagement state between the first engagement portion and the casing side engagement portion is held. That is, the first rotation member is connected to the casing.

On the other hand, in the excitation state of the first electromagnetic coil, the magnetic ring is attracted to the side of the first electromagnetic coil and is moved to the side of the first electromagnetic coil. Therefore, the first engagement portion, which is provided so as to be integrally moved with the magnetic ring, is moved in a direction separated from the casing side engagement portion. Thereby, the engagement between the first engagement portion and the casing side engagement portion is released, and the first rotation member is released from the casing. Therefore, the connection and the release between the first rotation member and the casing can be switched by a relatively simple configuration.

According to a transmission driving device of third aspect of the present invention, the first clutch may further include an armature (167) that is provided so as to be integrally rotated with the first rotation member between the first electromagnetic coil and the casing side engagement portion, in the excitation state of the first electromagnetic coil, the armature is attracted to the side of the first electromagnetic coil, the armature is engaged with the input shaft, and thereby, the first rotation member and the input shaft may be connected to each other, and, in the non-excitation state of the first electromagnetic coil, an engagement between the armature and the first rotation member is released, and thereby, the first rotation member may be released from the input shaft, and the first engagement portion may be provided so as to be integrally moved with the armature.

According to this configuration, the first electromagnetic coil is disposed at a side opposite to the casing side engagement portion with respect to the armature. The first engagement portion can be integrally moved with the armature.

In the non-excitation state of the first electromagnetic coil, since the armature is not attracted to the side of the first electromagnetic coil, the armature is not engaged with the input shaft. Moreover, since the attraction of the armature is not generated, the first engagement portion is not moved, the engagement state between the first engagement portion and the casing side engagement portion is held. Therefore, in this state, the first rotation member is released from the input shaft and is connected to the casing.

On the other hand, in the excitation state of the first electromagnetic coil, the armature is attracted to the side of the first electromagnetic coil, is moved to the side of the first electromagnetic coil, and is engaged with the input shaft. Moreover, the first engagement portion, which is provided so as to be integrally moved with armature, is moved in the direction separated from the casing side engagement portion, and thereby, the engagement between the first engagement portion and the casing side engagement portion is released. Therefore, in the excitation state, the first rotation member is released from the casing and is connected to the input shaft. Thereby, the connection and the release of the first rotation member with respect to the casing can be switched by a relatively simple configuration.

In addition, the first engagement portion is provided so as to be integrally moved with the armature. Thereby, it is not necessary to separately provide a member for connecting the casing, and the reduction in the costs can be further improved.

According to a fourth aspect of the present invention, the first engagement portion may include a frictional portion (56) that is frictionally engaged with the casing side engagement portion. In this case, the frictional portion may be formed in an annular shape. In this configuration, the casing side engagement portion and the first engagement portion can be engaged with each other regardless of the rotation posture of the first rotation member with respect to the input shaft. Thereby, the mutual rotation posture in the connection state of the input shaft and the first rotation member is not limited.

In addition, according to a fifth aspect of the present invention, the first engagement portion may include an engagement piece (170) or an engagement recess that is locked and engaged with the casing side engagement portion. In this case, the casing side engagement portion and the first engagement portion can be securely engaged with each other. Thereby, the rotation of the first rotation member at the time of the release of the first clutch can be more reliably prevented. Moreover, the engagement recess may be configured of a groove or a hole.

According to a transmission driving device of a sixth aspect of the present invention, the transmission driving device may further comprise a second engagement portion (71) that can be engaged with the casing side engagement portion, the second clutch may be configured of an electromagnetic clutch that includes a second electromagnetic coil (37), the second engagement portion is attracted to a side of the second electromagnetic coil and the second engagement portion may be engaged with the casing side engagement portion in a non-excitation state of the second electromagnetic coil in the second clutch, and an engagement between the second engagement portion and the casing side engagement portion may be released in an excitation state of the second electromagnetic coil.

According to this configuration, the second engagement portion that can be engaged with the casing side engagement portion is provided so as to be integrally rotated with the second rotation member. In the non-excitation state of the second electromagnetic coil, the second engagement portion is engaged with the casing side engagement portion. Moreover, in the excitation state of the second electromagnetic coil, the second engagement portion is attracted to the second electromagnetic coil, and the engagement between the second engagement portion and the casing side engagement portion is released.

When the input shaft and the first rotation member are connected to each other, since the second electromagnetic coil of the second clutch is in the non-excitation state, the second engagement portion and the casing side engagement portion are engaged with each other, and the second rotation member is connected to the casing. In the connection state of the second rotation member and the casing, the second rotation member cannot be rotated.

Moreover, when the input shaft and the second rotation member are connected to each other, since the second electromagnetic coil of the second clutch is in the excitation state, the engagement between the second engagement portion and the casing side engagement portion is released. That is, the second rotation member is released from the casing. Therefore, if the rotating torque is transmitted from the input shaft to the second rotation member, the second rotation member is integrally rotated with the input shaft.

Thereby, both the first and second rotation members cannot be rotated at the release state from the input shaft. Therefore, in a case where there is reverse input in the shift operation member or the select operation member, displacement (movement or rotation) of the operation member can be prevented.

DESCRIPTION OF EMBODIMENTS

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.FIG. 1is a view showing a schematic configuration of a transmission2in which a transmission driving device1according to an embodiment (first embodiment) of the present invention is incorporated.FIG. 2is an exploded perspective view showing a schematic configuration of the transmission driving device1.

The transmission2is a known parallel gear type transmission (not shown) and is installed in a vehicle such as a car or a truck. The transmission2includes a gear housing4, a parallel gear type shifting mechanism (not shown) that is accommodated in the gear housing4, and the transmission driving device1for driving the shifting mechanism. The transmission driving device1includes a shift shaft (shift operation member)8that causes the shifting mechanism to perform the shift operation, a select shaft (select operation member)12that causes the shifting mechanism to perform the select operation, and an electrical actuator3that is used as a common drive source for driving the shift shaft8and the select shaft12.

One end10aof an internal lever10that is accommodated in the gear housing4is supported to a middle portion of the shift shaft8so as to be rotated along with the shift shaft and to be moved in an axial direction Y1of the shift shaft8. Specifically, a male spline8bof the shift shaft8is fitted to a female spline of the inner circumference of a spline hole that is provided at the one end10aof the internal lever10. The internal lever10is rotated along with the shift shaft8around a center axis line C1of the shift shaft8. One end8aof the shift shaft8protrudes outside the gear housing4.

The select shaft12extends along a direction that is approximately perpendicular to the shift shaft8. One end of the select shaft12is connected to one end13aof a select fork13. Thereby, the select fork13can be rotated along with the select shaft12around a center axis line C2of the select shaft12. A two-pronged fork14that is engaged with the internal lever is provided at the other end13bof the select fork13. The other end12aof the select shaft12protrudes outside the gear housing4.

A plurality of shift rods15,16, and17that are parallel to one another are accommodated in the gear housing4. Shift blocks18,19, and20engaged with the other end10bof the internal lever10are fixed to each of the shift rods15,16, and17. In addition, a shift fork21that is engaged with a clutch sleeve (not shown) is provided at each shift rod (InFIG. 2, only shift fork21that is provided at the shift rod17is shown).

The electrical actuator3is provided outside the gear housing4and includes a cylindrical casing5, a first output shaft6that is accommodated in the casing5, and a second output shaft7. The electrical actuator3is fixed to the outer surface of the gear housing4or a predetermined place of a vehicle. The electrical actuator includes an electric motor9that selectively outputs rotating torque with respect to the first output shaft6or the second output shaft7. The first output shaft6and the second output shaft7are coaxially disposed and are provided so as to be rotated independently to each other.

The first output shaft6is configured of a screw shaft and a first nut22is mounted on the first output shaft6via balls (not shown). The first output shaft6and the first nut22function as a ball screw mechanism. The second output shaft7is configured of a screw shaft and a second nut23is mounted on the second output shaft7via balls (not shown). The second output shaft7and the second nut23function as a ball screw mechanism. The one end8aof the shift shaft8penetrates the casing5and is connected to the first nut22.

Moreover, the other end12aof the select shaft12is connected to a second nut23that is mounted on the second output shaft7via a link mechanism24. The rotating torque of the second output shaft7is transmitted to the select shaft12through the link mechanism24. The link mechanism24includes a first link arm25that includes a first end25aand a second end25b, a second link arm26that includes a third end26aand a fourth end26b, and a third link arm27that includes a fifth end27aand a sixth end27b.

The first end25apenetrates the casing5and is rotatably connected to the second nut23. Moreover, the first end is rotatably supported through the first link arm25. The first link arm25can swing around a supporting point28. The third end26ais connected and fixed to the other end12aof the select shaft12. Thereby, the second link arm26is rotated along with the select shaft12around the center axis line C2. The third link arm27connects the second end25band the fourth end26b. Specifically, the fifth end27ais connected to the second end25b, and the sixth end27bis connected to the fourth end26b. Since the third link arm27connects the opened ends, the third link arm can change a posture with respect to the first and second link arms25and26. If the first link arm25swings around the supporting point28, the second link arm26is swung in association with the swing operation of the first link arm, and thereby, the select shaft12is rotated around the center axis line C2.

If the second output shaft7of the electric actuator3is rotated, according to this, the second output shaft7and the select fork13swing around the center axis line C2of the select shaft12. Thereby, the fork14of the other end of the select fork13causes the internal lever10to be moved in the axial direction Y1of the shift shaft8. As a result, the other end10bof the inter lever10is engaged with desired shift blocks18,19, and20, and thereby, the select operation is achieved.

On the other hand, if the first output shaft6of the electrical actuator3is rotated, according to this, the shift shaft8and the internal lever10swing around the center axis line C1of the shift shaft8. As a result, the shift blocks18,19, and20which are respectively engaged with the internal lever10are moved in an axial direction Z1of the shift rods15,16, and17, and thereby, the shift operation is achieved.

FIGS. 3 and 4are cross-sectional views of the electrical actuator3.FIG. 3shows when an input shaft described below and a first rotor described below (first rotation member)31are connected to each other, andFIG. 4shows the input shaft30and a second rotor (second rotation member)32are connected.

As described above, the input shaft30to which the rotating torque of the electric motor9(refer toFIG. 1) is input is accommodated in the casing5. The outline of the input shaft30has a cylindrical shape, and the input shaft is disposed so as to be in the same center as the first output shaft6and the second output shaft7. The input shaft30can be moved (reciprocate) in the axial direction. The first rotor31and the second rotor32are accommodated in the casing5so as to interpose the input shaft30in the axial direction. The first rotor31is disposed at one side of the input shaft30(right side shown inFIGS. 3 and 4). The second rotor32is disposed at the other side of the input shaft30(left side shown inFIGS. 3 and 4). Moreover, the first and second rotors31and32cannot be moved in the axial direction.

In addition, a clutch mechanism33for switching a destination of connection of the input shaft30between the first rotor31and the second rotor32(for selectively transmitting the rotating torque of the input shaft30to the first rotor31and the second rotor32) is accommodated in the casing5. The clutch mechanism33includes a first clutch34that connects the first rotor31to the input shaft30and releases the first rotor31from the input shaft30, and a second clutch35that connects the second rotor30to the input shaft30and releases the second rotor32from the input shaft30. The second clutch35is in a non-operating state (non-excitation state of a second electromagnetic coil37described below) at an operating state of the first clutch (excitation state of a first electromagnetic coil36described below), and the first clutch34is in a non-operating state (non-excitation state of the first electromagnetic coil36described below) at an operating state of the second clutch35(excitation state of the second electromagnetic coil37described below).

A first spring member (referFIG. 4and not shown inFIG. 3)38is disposed so as to be fixed to substantially the entire area of the side surface of the one side of the input shaft30(right side shown inFIGS. 3 and 4). For example, the first spring member38is configured of a disc-shaped plate spring or the like. A disc-shaped first magnetic plate39is disposed so as to be fixed to one side of the first spring member38(right side shown inFIGS. 3 and 4). Moreover, a disc-shaped first facing40is disposed so as to be fixed to one side (right side shownFIGS. 3 and 4) of the first magnetic plate39. A first armature41described below is configured by the first magnetic plate39and the first facing40. That is, the first spring member38, the first magnetic plate39, and the first facing40are disposed so as to be laminated in the order from the side of the input shaft30. Each of the members38,39, and40has substantially the same outer diameter as one another, and the members are disposed so that a gap is formed between outer circumferences of the members and the inner circumference of the casing5.

A second spring member (referFIG. 3and not shown inFIG. 4)42is disposed so as to be fixed to substantially the entire area of the side surface of the other side of the input shaft30(left side shown inFIGS. 3 and 4). For example, the second spring member42is configured of a disc-shaped plate spring or the like. A disc-shaped second magnetic plate43is disposed so as to be fixed to the other side of the second spring member42(left side shown inFIGS. 3 and 4). Moreover, a disc-shaped second facing44is disposed so as to be fixed to the other side (left side shownFIGS. 3 and 4) of the second magnetic plate43. A second armature45described below is configured by the second magnetic plate43and the second facing44. That is, the second spring member42, the second magnetic plate43, and the second facing44are disposed so as to be laminated in the order from the side of the input shaft30. Each of the members42,43, and44has substantially the same outer diameter as one another, and the members are disposed so that a gap is formed between outer circumferences of the members and the inner circumference of the casing5.

Thereby, each of the members38,39,40,42,43, and44is integrally rotated with the input shaft30and is moved in the axial direction along with the input shaft30.

Next, the first rotor31and the first clutch34will be described.

The first rotor31is coaxially and rotatably supported to the input shaft30via a first rolling bearing47and an annular first field48(described below). Specifically, the first field48is fitted and fixed into the easing5, and an outer ring of the first rolling bearing47is fitted and fixed into the inner circumference of the first field48. The first rotor31includes a main body portion80having an outline of an approximately cylindrical shape, a first armature hub49having a large diameter that protrudes outside in the radial direction from the outer circumference of the main body portion80, a first brake hub50having a large diameter that protrudes outside in the radial direction from the outer circumference of the main body portion80, and a first boss51for supporting an end of a first output shaft6. The first armature hub49is provided in the inner end (end of the side of the input shaft30and left end shown inFIGS. 3 and 4) in the axial direction. The first brake hub50is provided further outside (side opposite to the input shaft30and right side shown inFIGS. 3 and 4) in the axial direction than a supporting position of the first rolling bearing47. The first armature hub49and the first brake hub50have substantially the same diameter as each other. The first boss51is formed outside (side opposite to the side of the input shaft30and right side shown inFIGS. 3 and 4) in the axial direction of the first brake hub50. The end of the first output shaft6(left end shown inFIGS. 3 and 4) is mounted so as to be fixed to the first boss51.

The first clutch34includes the first field48and the first armature41. The first field48houses the first electromagnetic coil36in the yoke. A third facing53having a discoid shape is disposed so as to be fixed to the entire area of the side surface of the side of the input shaft30(left surface shown inFIGS. 3 and 4) of the first rotor (first armature hub49). The third facing is a facing for being frictionally engaged with the first facing40. The third facing53is disposed so that a gap is formed between the outer circumference of the third facing and the inner circumference of the casing5.

Moreover, an annular third spring member54(refer toFIG. 4and not shown inFIG. 3) is disposed so as to be fixed to the circumferential edge portion of the side surface (right surface shown inFIGS. 3 and 4) opposite to the side of the input shaft30in the first brake hub50. For example, the third spring member54is configured of a plate spring or the like. An annular plate-like first magnetic ring55is disposed so as to be fixed to the side (right side shown inFIGS. 3 and 4) opposite to the side of the input shaft30in the third spring member54. The first magnetic ring55is disposed at a position at which the circumferential edge portion of the first armature hub49is interposed between the first magnetic ring and the first field48. In addition, an annular plate-like fourth facing (a first engagement portion and a frictional portion)56is disposed so as to be fixed to the side (right side shown inFIGS. 3 and 4) opposite to the side of the input shaft30in the first magnetic ring55. That is, the third spring member54, the first magnetic ring55, and the fourth facing56are disposed so as to be laminated in the order from the side of the input shaft30. Each of the members54,55, and56has substantially the same inner diameter and outer diameter as one another, and the members are disposed so that a gap is formed between outer circumferences of the members and the inner circumference of the casing5. Each of the members54,55and56is integrally rotated with the first rotor31and is moved in the axial direction along with the first rotor31.

On the other hand, an annular plate-like first engagement ring58which encloses the first boss51and the first output shaft6is formed so as to protrude inward from the inner circumference in the casing5. The first engagement ring58is disposed at the side (right side shown inFIGS. 3 and 4) further separated from the side of the input shaft30than the first brake hub50in the axial direction. The first engagement ring58includes a first opposite surface59that is opposite to the circumferential edge portion (that is, the disposition area of the fourth facing56) of the side surface (right surface shown inFIGS. 3 and 4) opposite to the side of the input shaft30in the first brake hub50. A fifth facing (casing side engagement portion)60for being frictionally engaged with the fourth facing56is disposed so as to be fixed to the first opposite surface59. The fifth facing60is disposed so that a gap is formed between the outer circumference of the fifth facing and the inner circumference of the casing5.

The fourth facing56is frictionally engaged with the fifth facing60in the non-excitation state (refer toFIG. 4) of the first electromagnetic coil36. In addition, in the excitation state (refer toFIG. 3) of the first electromagnetic coil36, the first magnetic ring55that is integrally provided in the fourth facing56is attracted to the first field48including the first electromagnetic coil36, and the fourth facing56is moved toward a direction separated from the fifth facing60(left direction shown inFIGS. 3 and 4), and therefore, the engagement between the fourth facing56and the fifth facing60are released, and a gap is formed between the fourth facing56and the fifth facing60.

Next, the second rotor32and the second clutch35will be described.

The second rotor32is coaxially and rotatably supported to the input shaft30via a second rolling bearing62and an annular second field63(described below). Specifically, the second field63is fitted and fixed into the casing5, and an outer ring of the second rolling bearing62is fitted and fixed into the inner circumference of the second field63. The second rotor32includes a main body portion81having an outline of an approximately cylindrical shape, a second armature hub64having a large diameter that protrudes outside in the radial direction from the outer circumference of the main body portion81, a second brake hub65having a large diameter that protrudes outside in the radial direction from the outer circumference of the main body portion81, and a second boss66for supporting an end of the second output shaft7. The second armature hub64is provided in the inner end in the axial direction (end of the side of the input shaft30and right end shown inFIGS. 3 and 4). The second armature hub64is provided further outside (side opposite to the input shaft30and left side shown inFIGS. 3 and 4) in the axial direction than a supporting position of the second rolling bearing62. The second armature hub64and the second brake hub65have substantially the same diameter as each other. The second boss66is formed outside in the axial direction of the second brake hub65(side opposite to the side of the input shaft30and left side shown inFIGS. 3 and 4). The end of the second output shaft7(right end shown inFIGS. 3 and 4) is mounted so as to be fixed to the second boss66.

The second clutch35includes the second field63and the second armature45. The second field63houses the second electromagnetic coil37in the yoke. A sixth facing68having a discoid shape is disposed so as to be fixed to the entire area of the side surface (right surface shown inFIGS. 3 and 4) of the side of the input shaft30of the second rotor32(second armature hub64). The sixth facing68is a facing for being frictionally engaged with the second facing44. The sixth facing68is disposed so that a gap is formed between the outer circumference of the sixth facing and the inner circumference of the casing5.

Moreover, an annular fourth spring member69(refer toFIG. 3and not shown inFIG. 4) is disposed so as to be fixed to the circumferential edge portion of the side surface (left surface shown inFIGS. 3 and 4) opposite to the side of the input shaft30in the second brake hub65. For example, the fourth spring member69is configured of a plate spring or the like. An annular plate-like second magnetic ring70is disposed so as to be fixed to the side (left side shown inFIGS. 3 and 4) opposite to the side of the input shaft30in the fourth spring member69. The second magnetic ring70is disposed at a position at which the circumferential edge portion of the second armature hub64is interposed between the second magnetic ring and the second field63. In addition, an annular plate-like seventh facing71is disposed so as to be fixed to the side (left side shown inFIGS. 3 and 4) opposite to the side of the input shaft30in the second magnetic ring70. That is, the fourth spring member69, the second magnetic ring70, and the seventh facing71are disposed so as to be laminated in the order from the side of the input shaft30. Each of the members69,70, and71has substantially the same inner diameter and outer diameter as one another, and the members are disposed so that a gap is formed between outer circumferences of the members and the inner circumference of the casing5. Each of the members69,70and71is integrally rotated with the second rotor32and is moved in the axial direction along with the second rotor32.

On the other hand, an annular plate-like second engagement ring73which encloses the second boss66and the second output shaft7is formed so as to protrude inward from the inner circumference in the casing5. The second engagement ring73is disposed at the side (left side shown inFIGS. 3 and 4) further separated from the side of the input shaft30than the second brake hub65in the axial direction. The second engagement ring73includes a second opposite surface74that is opposite to the circumferential edge portion (that is, the disposition area of the seventh facing71) of the side surface (left surface shown inFIGS. 3 and 4) opposite to the side of the input shaft30in the second brake hub65. An eighth facing (casing side engagement portion)75for being frictionally engaged with the seventh facing71is disposed so as to be fixed to the second opposite surface74. The eighth facing75is disposed so that a gap is formed between the outer circumference of the eighth facing and the inner circumference of the casing5.

The seventh facing71is frictionally engaged with the eighth facing75in the non-excitation state (refer toFIG. 3) of the second electromagnetic coil37. In addition, in the excitation state (refer toFIG. 4) of the second electromagnetic coil37, the second magnetic ring70that is integrally provided in the seventh facing71is attracted to the second field63including the second electromagnetic coil37, and the seventh facing71is moved toward a direction (right direction shown inFIGS. 3 and 4) separated from the eighth facing75, and therefore, the engagement between the seventh facing71and the eighth facing75are released, and a gap is formed between the seventh facing71and the eighth facing75.

In addition, for example, first to eighth facings40,44,53,56,60,68,71, and75are formed using a friction material such as a cold rolled special steel strip (SK5M or the like).

When the input shaft30and the first rotor31are connected to each other (refer toFIG. 3), the first clutch34is in a connection state, and the second clutch is in a release state. At this time, the first electromagnetic coil36is in an excitation state and the second electromagnetic coil37is in a non-excitation state.

In this state, the second armature45is not attracted to the second field63while the first armature is attracted to the first field48. Therefore, the first armature41and the input shaft30are moved toward the side of the first rotor31(right direction shown inFIGS. 3 and 4). Moreover, the third facing53, which configures a portion of the first armature41, is frictionally engaged with the first facing40that is fixed to the first rotor31. Thereby, the engagement between the first armature41and the input shaft30is achieved, and the first output shaft6is connected to the input shaft30.

In addition, in the excitation state of the first electromagnetic coil36, the first magnetic ring55is attracted to the side of the first electromagnetic coil36and is moved in the axial direction toward the side of the first electromagnetic coil36(left side shown inFIGS. 3 and 4). Therefore, the fourth facing56that is fixed to the first magnetic ring55is moved toward a direction separated from the fifth facing60(first engagement ring58), and thereby, the engagement between the fourth facing56and the fifth facing60is released. Therefore, the rotating torque of the input shaft30is transmitted to the first rotor31. Moreover, the rotating torque of the first rotor31is transmitted to the first output shaft6that is fixed to the first rotor31. According to the rotation of the first output shaft6, the first nut22is moved in the axial direction, and thereby, the select shaft12is rotated.

In addition, in the connection state of the input shaft30and the first output shaft6, the first spring member38is interposed between the first magnetic plate and the input shaft30and is shrunk in the axial direction, and the third spring member54is interposed between the first magnetic ring55and the first brake hub and is shrunk in the axial direction. Thereby, the first spring member38and the third spring member54are not shown inFIG. 3.

Moreover, in the non-excitation state of the second electromagnetic coil37, the second magnetic ring70is not attracted to the side of the second electromagnetic coil37, and the second magnetic ring70is not moved in the axial direction. Thereby, the seventh facing71, which is fixed to the second magnetic ring70, and the eighth facing75(second engagement ring73) are in a state in which the seventh facing71and the eighth facing75are engaged with each other. That is, when the input shaft30and the first rotor31are connected to each other, the second rotor32is connected to the casing5. In the connection state of the second rotor32and the casing5, the second rotor32is held by the casing5and cannot be rotated.

On the other hand, as shown inFIG. 4, when the input shaft30and the second rotor32are connected to each other (refer toFIG. 4), the second clutch35is in a connection state, and the first clutch34is in a release state. At this time, the second electromagnetic coil37is in an excitation state and the first electromagnetic coil36is in a non-excitation state.

In this state, the first armature41is not attracted to the first field48while the second armature45is attracted to the second field63. Therefore, the second armature45and the input shaft30are moved toward the side of the second field63. Moreover, the sixth facing68, which configures a portion of the second armature45, is frictionally engaged with the second facing44that is fixed to the input shaft30. Thereby, the engagement between the second armature45and the input shaft30is achieved, and the second output shaft7is connected to the input shaft30.

In addition, in the excitation state of the second electromagnetic coil37, the second magnetic ring70is attracted to the side of the second electromagnetic coil37and is moved in the axial direction toward the side of the second electromagnetic coil37. Therefore, the seventh facing71that is fixed to the second magnetic ring70is moved toward a direction separated from the eighth facing75(second engagement ring73), and thereby, the engagement between the seventh facing71and the eighth facing75is released. Therefore, the rotating torque of the input shaft30is transmitted to the second rotor32. Moreover, the rotating torque of the second rotor32is transmitted to the second output shaft7that is fixed to the second rotor32. According to the rotation of the second output shaft7, the second nut23is moved in the axial direction, and thereby, the select shaft12is rotated.

In addition, since the input shaft30is moved to the side of the second field63, the first armature41and the third facing53that is fixed to the first rotor31are not engaged with each other. Moreover, in a non-excitation state of the first electromagnetic coil36, the first magnetic ring55is not attracted to the side of the first electromagnetic coil36, and the first magnetic ring is not moved in the axial direction. Thereby, the fourth facing56, which is fixed to the first magnetic ring55, and the fifth facing60(first engagement ring58) are in a state in which the fourth facing56and the fifth facing60are engaged with each other. That is, when the input shaft30and the second rotor32are connected to each other, the first rotor31is connected to the casing5. In the connection state of the first rotor31and the casing5, the first rotor31is held by the casing5and cannot be rotated.

In addition, in the connection state of the input shaft30and the second output shaft7, the second spring member42is interposed between the second magnetic plate and the input shaft30and is shrunk in the axial direction, and the fourth spring member69is interposed between the second magnetic ring70and the second brake hub65and is shrunk in the axial direction. Thereby, the second spring member42and the fourth spring member69are not shown inFIG. 4.

As described above, according to this embodiment, in the connection state of the first rotor31and the input shaft30, the second rotor32is connected to the casing5. In the connection state of the second rotor32and the casing5, the second rotor32cannot be rotated. Therefore, when there is reverse input in the second rotor32, the rotation of the shift shaft8can be prevented.

Moreover, in the connection state of the second rotor32and the input shaft30, the first rotor31is connected to the casing5. In the connection state of the first rotor31and the casing5, the first rotor31cannot be rotated. Therefore, when there is reverse input in the first rotor31, the rotation of the select shaft12can be prevented.

Moreover, the connection and the release of the rotors31and32with respect to the casing5are performed using the electromagnetic coils36and37of the clutches34and35. Therefore, it is not necessary to provide a dedicated magnetic circuit for performing the connection and the release of the rotors31and32with respect to the casing5, and thereby, reduction in the costs can be improved.

Moreover, since the seventh and eighth facings71and75are formed in an annular shape respectively, the seventh facing71and the eighth facing75are engaged with each other regardless of the rotation posture of the first rotor31with respect to the input shaft30. In addition, since the seventh and eighth facings71and75are formed in an annular shape respectively, the seventh facing71and the eighth facing75can be engaged with each other regardless of the rotation posture of the second rotor32with respect to the input shaft30. Thereby, the mutual rotation posture in the connection state of the input shaft30and the rotors31and32is not limited.

FIG. 5is an exploded perspective view showing a schematic configuration of a transmission driving device100according to another embodiment (second embodiment) of the present invention. In the second embodiment, the same reference numerals as the first embodiment are denoted to portions corresponding to each portion of the embodiment (first embodiment) shown inFIGS. 1 to 4, descriptions thereof are omitted. Differences between a transmission driving device100shown inFIG. 5and the transmission driving device1shown inFIG. 1are that a shift select shaft (shift operation member and select operation member)101for performing a shift operation and a select operation instead of the shift shaft8and the select shaft12is provided in a shifting mechanism. The transmission driving device100includes an electrical actuator102(refer toFIG. 6) which is used as a common drive source for performing the shift operation and the select operation of the shift select shaft101.

One end10aof the internal lever10that is accommodated in the gear housing4is fixed to a middle portion of the shift select shaft101. One end10aof the shift select shaft101protrudes outside the gear housing4and penetrates into the electrical actuator102(refer toFIG. 6) that is provided outside the gear housing4. The shift select shaft101is moved in an axial direction Y2by the electrical actuator102and is rotated around a center axis line C3thereof. The electrical actuator102is fixed to the outer surface of the gear housing4or a predetermined place of a vehicle.

If the shift select shaft101is moved in an axial direction Y2by the electrical actuator102, the other end10bof the inter lever10is engaged with desired shift blocks18,19, and20, and thereby, the select operation is achieved. In addition, if the shift select shaft101is rotated around the center axis line C3by the electrical actuator102, the shift blocks18,19, and20which are respectively engaged with the internal lever10are moved the axial direction Z1of the shift rods15,16, and17, and thereby, the shift operation is achieved.

FIG. 6is a cross-sectional view of the electrical actuator of a transmission driving device shown inFIG. 5.FIG. 7is a cross-sectional view taken along a section line VII-VII ofFIG. 6.

The electrical actuator102includes an electric motor103, a shift conversion mechanism104for converting the rotating torque of the electric motor103to a force that rotates the shift select shaft101around the center axis line C3, a select conversion mechanism105for converting the rotating torque of the electric motor103to a force that is moved the shift select shaft101in the axial direction Y2, and a switching unit106for switching a destination of transmission of the rotation driving force of the electric motor103between the shift conversion mechanism104and the select conversion mechanism105. The electric motor103, the shift conversion mechanism104, the select conversion mechanism105, and the switching unit106are accommodated in a casing107having an approximately cylindrical shape.

For example, a brushless motor is adopted as the electric motor103. The electric motor103is disposed outside the casing107. An output shaft109of the electric motor103extends along a predetermined direction (left and right directions shown inFIG. 6) perpendicular to the shift select shaft101.

The switching unit106includes a first transmission shaft (input shaft)110that is coaxially connected to the output shaft109of the electric motor103, a first rotor (first rotation member)112that is coaxially and rotatably provided in the first transmission shaft110, a second rotor111that is coaxially and rotatably provided in the first transmission shaft110, and a clutch mechanism113for switching (selectively transmitting the rotating torque of the first transmission shaft110to the first rotor112and the second rotor111) a destination of connection of the first transmission shaft110between the first rotor112and the second rotor (second rotation member)111. The second rotor111is disposed at the side opposite to the electric motor103with respect to the first transmission shaft110.

The first transmission shaft110includes a main shaft portion114having a small diameter that is provided in the side of the electric motor103and a large diameter portion115that is provided in the side of the second rotor111so as to be continuous to the main shaft portion114and has a larger diameter than that of the main shaft portion114. The first rotor112that encloses the outer circumference of the main shaft portion114of the first transmission shaft110is provided at the side opposite to the second rotor111with respect to the large diameter portion115of the first transmission shaft. That is, the first and second rotors112and111are disposed so as to interpose the large diameter portion115of the first transmission shaft110.

The clutch mechanism113includes a first clutch117that connects the first rotor112to the first transmission shaft110, and releases the first rotor112from the first transmission shaft110, and a second clutch116that connects the second rotor111to the first transmission shaft110, and releases the second rotor111from the first transmission shaft110. The second clutch116is in a non-operating state (non-excitation state of a second electromagnetic coil118) at an operating state of the first clutch117(excitation state of a first electromagnetic coil119). The first clutch117is in a non-operating state (non-excitation state of the first electromagnetic coil119described below) at an operating state of the second clutch116(excitation state of the second electromagnetic coil118described below).

An annular first gear120having a relatively small diameter is externally fitted and fixed to the outer circumference of the first rotor112. The first gear120is coaxially provided on the first rotor112. The first gear120is supported by rolling bearings121and122. The outer rings of the rolling bearings121and122are fitted and fixed into the first gear120. The inner rings of the rolling bearings121and122are externally fitted and fixed to the outer circumference of the main shaft portion114of the first transmission shaft110.

The shift conversion mechanism104includes a ball screw mechanism140and a connection rod124that connects a nut123of the ball screw mechanism140and a shift select shaft101. The ball screw mechanism140includes a screw shaft125that is connected to the second rotor111and coaxially extends with the second rotor111, and a nut123that is mounted on the screw shaft125. A plurality of balls (not shown) are interposed so as to roll between a male screw of the screw shaft125and a female screw of the nut123, and the ball screw mechanism140converts a rotation motion of the second rotor111into an axial linear motion of the nut123.

One end of the screw shaft125(left end shown inFIG. 6) is supported by a rolling bearing126. The inner ring of the rolling bearing126is externally fitted and fixed to one end of the screw shaft125. Moreover, the outer ring of the rolling bearing126is fitted and fixed to a through-hole that penetrates inner and outer surfaces of a bottom wall127of a unit casing fixed to the casing. In addition, a lock nut is engaged to the outer ring of the rolling bearing126, and the movement of the rolling bearing toward the other side in the axial direction (right side shown inFIG. 6) is regulated. A portion that is positioned further toward the side of the electric motor103(left side shown inFIG. 6) than the rolling bearing126in one end of the screw shaft125is inserted into the inner circumference of the second rotor111and is integrally and rotatably connected to the second rotor111.

The other end of the screw shaft125(right end shown inFIG. 6) is supported by a rolling bearing128. The outer ring of the rolling bearing128is fixed to the casing107. In both side surfaces of the nut123, a pair of columnar engagement shafts129(only one is shown inFIG. 6) that extends in a direction (a direction perpendicular to the paper surface inFIG. 6and left and right directions shown inFIG. 7) parallel to the shift select shaft101is formed so as to protrude.

The shift select shaft101is supported so as to be linearly reciprocated in an axial direction Y2and to be rotated by a pair slide bearings130and131(refer toFIG. 7) that is fitted and fixed into the casing107. A plurality of rack teeth132(refer toFIG. 7) are formed on the outer circumference of the shift select shaft101with intervals in the axial direction Y2. A spline portion133is formed at a predetermined position close to a gear box2from the rack teeth132in the outer circumference of the shift select shaft101.

The connection rod124includes a first portion134that is connected to the nut123, a second portion135(refer toFIG. 7) that is connected to the shift select shaft101, and a connection portion136that connects the first portion134and the second portion135. The first portion134includes a pair of supporting plate portions138that has a U-shaped engagement groove137that is engaged with each engagement shaft129. The second portion135has a cylindrical shape and is externally fitted to the shift select shaft101. Spline grooves139(refer toFIG. 7) that are spline-fitted to the spline portion133formed on the outer circumference of the shift select shaft101are formed on the inner circumference of the second portion135. Thereby, the second portion135is connected to the shift select shaft101in a state where the second portion cannot be relatively rotated and can be relatively moved in the axial direction with respect to the shift select shaft101. Therefore, according to the rotation of the screw shaft125, if the nut123is moved along the axial direction of the screw shaft (left and right directions shown inFIG. 6and the direction perpendicular to the paper surface inFIG. 7), the connection rod124swings around the center axis line C3of the shift select shaft101.

The select conversion mechanism105includes a first gear120, a second transmission shaft141that extends to be parallel to the first transmission shaft110and is rotatably provided, a second gear142that is coaxially fixed at a predetermined position close to one end in the second transmission shaft141(left end shown inFIG. 6), and a pinion143having a small diameter that is coaxially fixed at a predetermined position close to the other end of the second transmission shaft141(right end shown inFIG. 6). Moreover, the second gear142is formed so as to have a larger diameter than those of the first gear120and the pinion143.

One end of the second transmission shaft141(left end shown inFIG. 6) is supported by a rolling bearing144. The inner ring of the rolling bearing144is externally fitted and fixed to one end of the second transmission shaft141(left end shown inFIG. 6). In addition, the outer ring of the rolling bearing144is fixed into a cylindrical recess that is formed on the inner surface of a cover which covers an opening of the casing107. Moreover, the other end of the second transmission shaft141(right end shown inFIG. 6) is supported by a rolling bearing145.

FIGS. 8 and 9are expanded cross-sectional views showing configurations of the first transmission shaft110, the first and second rotors112and111, and the clutch mechanism113.FIG. 8shows when the first transmission shaft110and the second rotor111are connected to each other, andFIG. 9shows when the first transmission shaft110and the first rotor112are connected to each other.

The first transmission110is coaxially and rotatably supported to the output shaft109of the electric motor103via a rolling bearing150and an annular first field151(described below). Specifically, the first field151is fitted and fixed into the casing107(the casing107is not shown inFIGS. 8 and 9), and the outer ring of the rolling bearing150is fitted and fixed into the first field151.

The large diameter portion115includes a main body152of the large diameter portion, a first armature hub153that extends outward in the radial direction from the outer circumference of the main body152of the large diameter portion, and an armature support hub154that extends outward in the radial direction from the outer circumference of the main body152of the large diameter portion. The first armature hub153is provided in the end of the side of the electric motor103of the large diameter portion115(left side shown inFIGS. 8 and 9). The armature support hub154is provided in the end of the side of the second rotor111of the large diameter portion115(right side shown inFIGS. 8 and 9).

An accommodation groove155that accommodates the rolling bearing150is formed between the first armature hub153and the armature support hub154in the outer circumference of the main body152of the large diameter portion. Moreover, the first field151that is externally fitted and fixed to the rolling bearing150is disposed so as to be adjacent to one side (right side shown inFIGS. 8 and 9) in the axial direction of the first armature hub153.

In addition, for example, the armature support hub154is formed of an annular plate spring. The armature support hub154includes a first opposite surface157that is opposed to a second armature hub156. A second armature158for being engaged with the second armature hub156is disposed so as to be fixed to the first opposite surface157.

As described above, the first rotor112is coaxially and rotatably supported to output shaft109of the electric motor103by the main shaft portion114of the first transmission shaft110via the rolling bearings121and122. The first rotor112includes a cylindrical main body portion164of the first rotor, and a plate spring portion165that is provided at the end (right end shown inFIGS. 8 and 9) of the side of the large diameter portion115in the first rotor112. The plate spring portion165includes a second opposite surface166that is opposed to the first armature hub153and has an annular plate shape, and the inner circumferential end of the plate spring portion is connected to the end of the side of the large diameter portion115of the main body portion164of the first rotor (right end shown inFIGS. 8 and 9). A first armature167for being engaged with the first armature hub153is disposed so as to be fixed to the second opposite surface166. That is, the first armature167and the first field151are disposed at a position in which the first armature hub153is interposed. The first field151houses the first electromagnetic coil119in the yoke. The first clutch117is configured by the first armature167, the first armature hub153and the first field151. In addition, the plate spring portion165may be integrally formed to the main body portion164of the first rotor or may be fixed to the main body portion164of the first rotor that is separately provided.

An engagement groove (casing side engagement portion)169and an engagement piece170that is locked and engaged with the groove, which are described below, are disposed so as to be fixed to a predetermined place of the middle portion in the radial direction of the other side surface168opposite to the second opposite surface166of the plate spring portion165(left surface shown inFIGS. 8 and 9).

In addition, an annular plate-like engagement plate (fixing member)171that encloses the main shaft portion114of the first transmission shaft110and the man body portion164of the first rotor is provided at the side opposite to the second rotor111(left side shown inFIGS. 8 and 9) with respect to the annular plate-like plate spring portion165. The engagement plate171is externally attached and fixed to the casing107. For example, a plate that prevents pull-off from the casing107of the switching unit106may be used as the engagement plate171. The engagement plate171includes an opposite surface172that is opposed to the other side surface168of the plate spring portion165. The engagement groove169which is locked and engaged with the engagement piece170is formed on the opposite surface172. The engagement grooves169are formed at a plurality of positions (for example, three positions) in the circumferential direction of the engagement plate171. As described above, since the shift select shaft101reciprocates in the axial direction according to the rotation of the first rotor112, the rotation posture of the first rotor112is in association with the position in the axial direction of the shift select shaft101. The formation position of the engagement groove169is set to a position in which the engagement groove is engaged with the engagement piece170of the first rotor112when the shift select shift select shaft101is predetermined select positions (three positions). Thereby, any one of the engagement grooves169is locked and engaged with the engagement piece170. Therefore, the first rotor112is connected to the casing107. In the connection state of the first rotor112and the casing107, the first rotor112is held by the casing107and cannot be rotated.

In the non-excitation state of the first electromagnetic coil119(refer toFIG. 8), the engagement piece170enters the engagement groove169, and the engagement piece170and the engagement groove169are locked and engaged with each other.

On the other hand, in the excitation sate of the first electromagnetic coil119(refer toFIG. 9), the first armature167is attracted to the first field151that includes the first electromagnetic coil119, the first armature167is moved toward the side of the second rotor111(right side shown inFIGS. 8 and 9), and the first armature167is frictionally engaged with the first armature hub153. At this time, the circumferential edge portion of the plate spring portion165is elastically deformed so as to approach the side of the first field151. According to the elastic deformation of the plate spring portion165, the engagement piece170is moved toward the direction separated from the engagement groove169(right side shown inFIGS. 8 and 9), and thereby, the lock-engagement between the engagement piece170and the engagement groove169is released.

The second rotor111is coaxially and rotatably supported to the output shaft109of the electric motor103via the rolling bearing160and the annular second field159. The second rotor111includes a main body portion161of the second rotor, and the second armature hub156that is provided at the end of the side of the first transmission shaft110in the second rotor111, has a larger diameter than that of the main body portion161of the second rotor, and has a discoid shape. A step portion162for locking the outer ring of the rolling bearing160is formed on the side opposite to the first transmission shaft110with respect to the second armature hub156in the outer circumference of the main body portion161of the second rotor. The second field159that is externally fitted to the rolling bearing160is disposed so as to be adjacent to the second armature hub156. That is, the second armature hub156is interposed between the second armature158and the second field159.

The second field159houses the second electromagnetic coil118in the yoke. The second clutch116is configured by the second armature158, the second armature hub156, and the second field159.

When the first transmission shaft110and the second rotor111are connected to each other (refer toFIG. 8), the second clutch116is in a connection state and the first clutch117is in a release state. At this time, the second electromagnetic coil118is in an excitation state, and the first electromagnetic coil119is in a non-excitation state. In this state, the second armature158is attracted to the second field159, and the second armature158is frictionally engaged with the second armature hub156. Thereby, the engagement between the second armature158and the first transmission shaft110is achieved, and the second rotor111is connected to the first transmission shaft110. In addition, since the first electromagnetic coil119is in a non-excitation state, the engagement piece170and the engagement groove169are locked and engaged with each other, the first rotor112is connected to the casing107, and the first rotor cannot be rotated.

Moreover, the first transmission shaft110and the second rotor111are integrally rotated, and the rotating torque of the first transmission shaft110is transmitted to the second rotor111. If the rotating torque from the electric motor103is applied to the second rotor111, the screw shaft125is rotated according to the rotation of the second rotor111, and the nut123that is mounted on the screw shaft125is moved in the axial direction. Moreover, according to the movement in the axial direction of the nut123, the connection rod124swings around the center axis line C3of the shift select shaft101. Since the second portion135of the connection rod124is provided so as to be not relatively rotated to the shift select shaft101, the shift select shaft101is rotated around the center axis line C3according to the swing of the connection rod124.

When the first transmission shaft110and the first rotor112are connected to each other (refer toFIG. 9), the first clutch117is in a connection state and the first electromagnetic clutch116is in a release state. At this time, the first electromagnetic coil119is in an excitation state, and the second electromagnetic coil118is in a non-excitation state. In this state, as described above, the first armature167is frictionally engaged with the first armature hub153, and the lock-engagement between the engagement piece170and the engagement groove169is released. Moreover, the first transmission shaft110and the first rotor112are integrally rotated, and the rotating torque of the first transmission shaft110is transmitted to the first rotor112. The rotating torque from the electric motor103that is applied to the first rotor112is applied to the pinion143via the first gear120, the second gear142, and the second transmission shaft141. Moreover, due to the engagement between the rack teeth132and the pinion143, the shift select shaft101is moved in the axial direction Y2according to the rotation of the pinion143. Thereby, the rotating torque of the electric motor103is converted into a moving force in the axial direction Y2of the shift select shaft101.

As described above, according to this embodiment, in the connection state of the second rotor111and the first transmission shaft110, the first rotor112is connected to the casing107. In the connection state of the first rotor112and the casing107, the first rotor112cannot be rotated. Therefore, when there is reverse input in the first rotor112that is released from the first transmission shaft110, the movement in the axial direction of the shift select shaft101can be prevented.

Moreover, the connection/release with respect to the casing107of the first rotor112is performed using the first electromagnetic coil119of the first clutch117. Therefore, it is not necessary to provide a dedicated magnetic circuit for performing the connection/release of the first rotor112to the casing107, and thereby, reduction in the costs can be improved.

In addition, the engagement piece170is provided so as to be integrally moved with the first armature167. Therefore, it not necessary to separately provide a member for connecting the first armature to the casing107, and the reduction in the costs can be further improved.

In addition, as shown in a broken line inFIG. 6, in the mounting of the electrical actuator102on a vehicle, if the shift select shaft101extends in the up and down directions (vertical direction or direction near to the vertical direction), the downward force (downward direction force) due to the itself weight of the shift select shaft101acts on the shift select shaft, the rotating force based on the itself weight of the shift select shaft101acts on the first rotor112via the pinion143, the second transmission shaft141, and the first and second gears120and142. When the first transmission shaft110and the first roller112are connected to each other, the shift select shaft101does not lower (is not moved in the axial direction) due to itself weight. However, when the first transmission shaft110and the first rotor112are in a release state, the first rotor112receives the rotating force based on the itself weight of the shift select shaft101and is rotated, and as a result, there is a concern that the lowering of the shift select shaft101may be admitted.

On the other hand, in this embodiment, when the second rotor111is connected to the first transmission shaft110, the first rotor112is connected to the casing107. Thereby, the first rotor112is not rotated. Thereby, in the release state of the first transmission shaft110and the second rotor111, the lowering of the shift select shaft101can be reliably prevented.

As described above, two embodiments of the present invention are described. However, another embodiment of the present invention may be performed.

For example, in the second embodiment, the case where the engagement groove169is used as an engagement recess is described as an example. However, an engagement hole (through-hole that penetrates the plate spring portion165) may be adopted as the engagement recess. In addition, the configuration is described as an example in which the engagement piece170is adopted as the first engagement portion and the engagement recess is adopted as the casing side engagement portion. However, a configuration may be applied in which the engagement recess is adopted as the first engagement portion and the engagement piece170is adopted as the casing side engagement portion.

In the first embodiment, the engagement rings58and73are not a portion of the casing5and may be externally attached and fixed to casing5. Moreover, in the second embodiment, the engagement plate171is not externally attached and fixed to the casing107and may be configured as a portion of the casing107.

In addition, in the second embodiment, the shape of the engagement plate171is not limited to the annular plate shape. Moreover, a plurality of plates in which the engagement groove169is formed respectively may be combined and configured.

In addition, in the first embodiment, the connection state between the rotors31and32and the casing5may be realized by the lock-engagement (mesh) like the second embodiment.

Moreover, in the second embodiment, the connection state between the first rotor112and the casing107may be realized by the frictional engagement like the first embodiment.

In addition, in the second embodiment, the configuration is described as an example which connects the first rotor112for moving (performs the select operation) the shift select shaft101in the axial direction and the casing107. However, instead of this, a configuration may be adopted which connects the second rotor111for rotating (performs the shift operation) the shift select shaft101and the casing107. Moreover, both of the configuration which connects the first rotor112and the casing107and the configuration which connects the second rotor111and the casing107may be adopted.

In addition, various design modifications may be applied within a range of matters described in claims.

INDUSTRIAL APPLICABILITY

According to the present invention, in the transmission driving device, it is possible to prevent the displacement of the shift operation member or the select operation member in a case where there is the reverse input in the shift operation member or the select operation member by inhibiting rotation of the rotation member which is released from the input shaft.

REFERENCE SIGNS LIST