Source: https://patents.google.com/patent/US5286237A/en
Timestamp: 2018-12-12 17:58:46
Document Index: 695938772

Matched Legal Cases: ['art 114', 'art 14', 'art 114', 'art 114', 'art 214', 'art 214', 'art 314', 'art 314']

US5286237A - Inscribed meshing planetary gear construction - Google Patents
Inscribed meshing planetary gear construction Download PDF
US5286237A
US5286237A US07928124 US92812492A US5286237A US 5286237 A US5286237 A US 5286237A US 07928124 US07928124 US 07928124 US 92812492 A US92812492 A US 92812492A US 5286237 A US5286237 A US 5286237A
US07928124
In order to improve rigidity and stability, shorten a whole length, reduce the number of component parts and assembling steps in an inscribed meshing planetary gear construction, a flange part 114 of an output shaft 102 inner pins 107 and support ring 117 are supported at both ends by bearings 115a and 115b, and then a reduction mechanism part is assembled between bearings 115a and 115b. Axial position of the inner pins 107 are set by inner rings 124a and 124b of the bearings 115a and 115b. Subsequently, with respect to inner pins 107, it is not necessary to provide any shoulder or treading, and the shape is allowed to be simplified, so that machining for high hardness and high accuracy can be realized at low cost, and then a predetermined quality can be secured together with both supporting structures without requiring any expensive inner rollers. This constitution can also be applied in the inscribed meshing planetary gear construction having a carrier pin 116.
This invention relates to an inscribed meshing planetary gear construction which is preferably applied to a speed increasing gear or a reduction gear, more particularly, a small-sized speed increasing gear or a reduction gear in which a high output is required.
In the prior art, it is widely known to provide a speed increasing gear or a reduction gear employing an inscribed meshing planetary gear construction comprising a first shaft, an external-tooth gear assembled on the first shaft through a eccentric body in a state where the external-tooth gear can be rotated eccentric around the first shaft, an internal-tooth gear with which the external-tooth gear is inscribed and meshed, and a second shaft connected to the external-tooth gear through means for transmitting only the rotation component of the external-tooth gear.
An example of the prior art of this construction is shown in FIGS. 9 and 10. This prior art is constructed such that said first shaft is considered as an input shaft, said second shaft is considered as an output shaft and at the same time said construction is considered to a reduction gear by fixing the internal-tooth gear.
External teeth 9 such as trochoidal or circular teeth etc. are provided at outer circumferences of said external-tooth gears 5a, 5b. The external teeth 9 are inscribed and meshed with the internal-tooth gear 10 fixed to the casing 12. The internal teeth of the internal-tooth gear are constructed such that an outer pin 11 is loosely fitted to an inner pin hole 13 to allow rotation of outer pin 11.
When the input shaft 1 is rotated once, in conjunction the eccentric bodies 3a, 3b rotates once. The external-tooth gears 5a, 5b are apt to in an oscillating manner rotate on an eccentric axis around the input shaft 1 through this one revolution of the eccentric bodies 3a and 3b. However, since the rotation is restricted by the internal-tooth gear 10, the external-tooth gears 5a, 5b almost perform eccentric rotation while being inscribed with the internal-tooth gear 10.
Now, it is assumed that the number of teeth of the external-tooth gears 5a, 5b is N and the number of teeth of the internal-tooth gear 10 is N+1, then the difference between the numbers of teeth is 1. Consequently, the external-tooth gears 5a, 5b are displaced by one tooth relative to the internal-tooth gear 10 fixed to the casing 12 every time the input shaft 1 is rotated. This means that one revolution of the input shaft 1 is decelerated to a revolution of -1/N (-indicates opposite direction of input shaft of the internal-tooth gear.
Said inner pin 7 is rotatably assembled to the flange part 14 and the support ring 17 through bushes 18a, 18b. That is, since the inner pin 7 is not necessarily tightly connected to the output shaft 2 due to the presence of the carrier pin 16, it can be constructed to be rotatable, resulting in that the prior art inner roller 8 can be eliminated. Said annular support ring 17 is assembled to an extremity end portion of said carrier pin 16. Since the carrier pin 16 only has a function to transmit a rotational force of the support ring 17 to the output shaft 2, there are provided through-holes 20a, 20b which do not contact with the carrier pin 16 even if the carrier pin 16 oscillates at the corresponding portion on the external-tooth gear 5a, 5b.
However, such a supporting construction has been constructed such that the shoulder and the threads are machined at the inner pin which is required increased-hardness and an accuracy so as to be threaded engaged with the input shaft and to be fixed to the flange part, and the nut is fastened. Therefore, it has some disadvantages that the machining accuracy or assemblying accuracy is difficult to attain, and the cost is excessively high. Furthermore, the load concentrated at the shoulder section which effect both supporting structures is eliminated, and another countermeasure for preventing loosing of the plate is required whereby a structure is extremely complex. Therefore, the fact is that this prior art structure (FIG. 13) is no comparison for said structure shown in FIGS. 11 and 12.
The present first invention overcomes the aforesaid problem in such a manner. That is, an inscribed meshing planetary gear construction comprises a first shaft, a external-tooth gear eccentrically and rotatably attached to the first shaft through eccentric body mounted on the first shaft, an internal-tooth gear with which the external-tooth gear is inscribed and meshed, a second shaft connected to the external-tooth gear through means for transmitting only a rotating component of the external-tooth gears. As the means for transmitting the rotational component, inner pins acting as an "isokinetic inscribed meshing mechanism" in respect to internal pin holes placed in the external-tooth gear are fixed at their either-ends to a flange part formed in the second shaft, and the other end is fixed to an annular support ring. In the above construction, both the annular support ring and the flange part of the second shaft are supported by the casings through a pair of bearings. Axial position of the flange part, support ring and inner pins is set by holding either one of a part of these three elements by each of inner rings or outer rings of the pair of bearings (claim 1).
The present second invention overcomes the aforesaid problem. An inscribed meshing planetary gear construction comprises the first shaft, a external-tooth gear eccentrically and rotatably attached to the first shaft through eccentric body mounted on the first shaft, internal-tooth gears with which the external-tooth gear is inscribed and meshed, the second shaft connected to the external-tooth gear through means for transmitting only a rotational component of the external-tooth gears. As the means for transmitting the rotational component, inner rollers acting as an isokinetic inscribed meshing mechanism in respect to inner roller holes placed in the external-tooth gear and inner pins passing through the inner roller are fixed at their either-ends to a flange part formed in the second shaft and the other ends are fixed to the annular support ring. In the above construction, both the annular support ring and the flange part of the second shaft are supported at casings through a pair of bearings. Axial position settings of the flange part, the support ring and the inner pins are performed by holding any one of these three elements by each of inner rings or outer rings of the pair of bearings (claim 3).
Preferably, the axial positional settings of the flange part, the support ring and the inner pins are performed in such a manner that both ends of the inner pins are held by respective inner rings of the pair of bearings (claims 2, 4).
The present third invention overcomes the aforesaid problem. That is, an inscribed meshing planetary gear construction comprises a first shaft, a external-tooth gear eccentrically and rotatably attached to the first shaft through an eccentric body mounted on the first shaft, an internal-tooth gear with which the external-tooth gear is inscribed and meshed, a second shaft connected to the external-tooth gears through means for transmitting only a rotational component of the external-tooth gears. As the means for transmitting the rotational component, inner pins acting as an isokinetic inscribed meshing mechanism in respect to inner roller holes placed in the external-tooth gear, an annular support ring for receiving a rotation corresponding to a rotational component of external-tooth gear through the inner pins, and a carrier member projected from the flange part formed in the second shaft and connected and fixed to the supporting ring are provided.
In the above construction, the carrier member is placed through the external-tooth gear, both the annular support ring and the flange part of the second shaft are supported by casings through a pair of bearings, and axial position settings of the flange part, the carrier member, the support ring are performed by holding either one of the three elements by respective inner rings or outer rings of the pair of bearings (claim 5).
The axial position setting of the flange part, carrier member and supporting ring may be performed by holding both ends of the carrier member with respective inner rings of the pair of bearings (claim 6).
In addition, the axial position setting of the inner pins may be performed by holding both ends of the inner pins with respective outer rings of the pair of bearings (claim 7).
However, when the cost is allowed to be rased, the inner rollers similar to hose of the prior art are covered on outer circumferences of the inner pins so as to cause the "isokinetic inscribed meshing mechanism" in respect to the external-tooth gear to perform a more smooth function, resulting in that the operation becomes more superior (the second invention).
III) since a shape of each of the inner pin is simple, a high accurate machining with a hard raw material can be easily obtained at a low cost, and then an expensive inner roller can be left out (without reducing quality or durability) because the inner pins are held in a stable condition in respect to an external radial through both ends supported manner. Incidentally in this case, when the inner rollers are provided, the device will have better quality.
In this case, a more superior result can be attained through holding of both ends of the carrier member by the respective inner rings of the bearings. Because, these inner rings of the pairs of bearings and the carrier member have no rotation relative to each other.
FIG. 2 is a sectional view along a line II--II of FIG. 1;
FIG. 4 is a sectional view along a line IV--IV of FIG. 3;
FIG. 6 is a sectional view showing a reduction gear to which an inscribed meshing planetary gear construction according to the present third invention is applied:
FIG. 7 is a sectional view along a line VII--VII of FIG. 6;
FIG. 9 is a sectional view showing a fundamental reduction gear to which the prior art inscribed meshing planetary gear construction is applied:
FIG. 10 is a sectional view along a line X--X of FIG. 9,
FIG. 12 is a sectional view along a line XII--XII of FIG. 11; and
FIG. 1 is a sectional view showing a reduction gear to which the inscribed meshing planetary gear construction according to the present first invention is applied, and FIG. 2 is a sectional view along a line II--II.
One end of each of the inner pins 07 is fitted (press fitted) into a flange part 114 of an output shaft 102. The other end of each of the inner pins 107 is fitted (press fitted) into the support ring 117.
Reference numeral 130 in the figure is a stopper ring for assuring connection press fitting) of the bearing 115a, and this stopper ring makes up for a connection between the flange part 114 and the inner pins 107.
For example as shown in FIG. 5, either the flange part 214 or the supporting ring 217 is formed with a hole 230 having a limited depth the inner pin 207 is fitted into the hole until it contacts with the bottom 231 of the hole 230, and at the same time, the position setting in the axial direction may be carried out by holding a part of the flange part 214 or the support ring 217 by a pair of bearings 215a and 215b.
FIG. 6 shows a sectional view of the reduction gear to which the inscribed meshing planetary gear construction according to the present third invention is applied. FIG. 7 is a sectional view along a line VII--VII.
More practically the position setting of the carrier pins 316 is carried out by the inner rings 324a and 324b of the bearings 315a and 315b. As a result, each of the support ring 317, the inner rings 324a and 324b of the bearings 315a and 315b, the carrier pins 316 and the flange part 314 has no relative rotation, whereby durability of the rigid member can be kept for a long period of time.
Since the inner pins 307 are freely fitted to the flange part 314 of the output shaft 302 and the inner pin holding holes 326 of the support ring 317, the inner pins 307 can freely be rotated, thereby a sliding generated between the inner pin holes 319a and 319b and the inner pins 307 can be well absorbed even if the inner roller 8 may not be exist).
While the invention has been described with reference to specific embodiments, their descriptions are illustrative and are not to be constrected as limiting the scope of the invention. Various modifications and changes may occur to those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
1. An inscribed meshing planetary gear construction, comprising:
an eccentric body mounted on the first shaft;
an external-tooth gear eccentrically and rotatably attached to the first shaft through the eccentric body;
an internal-tooth gear with which the external-tooth gear is inscribed and meshed;
a second shaft connected to the external-tooth gear through means for transmitting only a rotating component of the external-tooth gear, said means for transmitting only a rotating component comprising inner pins acting as an isokinetic inscribed meshing mechanism in respect to internal pin holes placed in said external-tooth gear, said inner pins being supported at their either-ends by a flange part formed in the second shaft, and at the other ends by an annular support ring,
wherein both said annular support ring and said flange part of the second shaft are supported to a casing through a pair of bearings, said pair of bearings having inner rings and outer rings, and wherein an axial position of the inner pins is set in such a manner that both ends of the inner pins are held by one of respective inner rings and outer rings of said pair of bearings.
2. An inscribed meshing planetary gear construction comprising:
an eccentric body mounting on the first shaft;
an internal-tooth gear with which are external-tooth gear is inscribed and meshes; and
a second shaft connected to the external-tooth gear through means for transmitting only a rotational component of the external-tooth gear, said means for transmitting only a rotating component comprising inner rollers acting as an isokinetic inscribed meshing mechanism in respect to inner roller holes placed in said external-tooth gear, and inner pins passing through the inner rollers and supported at either-ends by a flange part formed in the second shaft and at the other ends by an annular support ring,
wherein both said annular support ring and said flange part of the second shaft are supported at a casing through a pair of bearings, said pair of bearings having inner rings and outer rings, and wherein an axial position of inner pins is set in such a manner that both ends of the inner pins are held by one of respective inner rings and outer rings of said pair of bearings.
3. An inscribed meshing planetary gear construction comprising:
a second shaft connected to the external-tooth gear through means for transmitting only a rotational component of the external-tooth gear, said means for transmitting only a rotating component comprising inner pins acting as an isokinetic inscribed meshing mechanism in respect to inner holes placed in said external-tooth gear, an annular support ring for receiving a rotation corresponding to a rotational component of the external-tooth gear through the inner pins, and a carrier member projected from a flange part formed in the second shaft, and connected and fixed to the support ring,
wherein said carrier member is placed through the external-tooth gear, both the annular support ring and the flange part of the second shaft are supported at a casing through a pair of bearings, said pair of bearings having inner and outer rings, and wherein an axial position of the inner pins is set by holding both ends of said inner pins by one of respective inner rings and respective outer rings of said pair of bearings.
US07928124 1991-08-13 1992-08-11 Inscribed meshing planetary gear construction Expired - Lifetime US5286237A (en)
JP3-228339 1991-08-13
JP3-228341 1991-08-13
US5286237A true US5286237A (en) 1994-02-15
US07928124 Expired - Lifetime US5286237A (en) 1991-08-13 1992-08-11 Inscribed meshing planetary gear construction
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