STARTER

Abstract: A starter (20) of magnetic pinion shift type wherein a waterproofing boot (21) is provided on a shift lever (8) for shifting a pinion slidably fitted into an output rotary shaft (3) of a motor provided for a vehicle engine to waterproof an electro-magnetic switch (5) disposed below the motor.

Description: The present invention relates to a starter of magnetic pinion shift type which shifts a pinion shifting member being slidably supported to an output rotary shaft by sliding it by a shift lever being connected with an electro-magnetic switch. Heretofore, this type of starter has been a well known apparatus disclosed in such as Japanese Utility Model Application Laid-Open No. 63-71474 (1988). In the accompanying drawings Fig. 1 is a sectional view illustrating a general configuration of this type of starter 1, and Fig. 2 is a perspective view illustrating the state how the parts of one portion thereof are being integrated. An output rotary shaft 3 rotates according to torque of a direct current motor 2, and a pinion shifting member 4 is slidably fitted on the output rotary shaft 3. The pinion shifting member 4 is engaged with a ring gear of an engine (not shown), transmitting the torque being generated in the direct current motor 2 to the engine. Beneath the direct current motor 2, there is arranged an electro-magnetic switch 5 which slides the pinion shifting member 4 on the output rotary shaft 3 and gives a power source to the direct current motor 2. At the front end of the electro-magnetic switch 5, there are arranged a plunger 6 being drawn by the electro-magnetic switch 5 and a hook 7 moving with the plunger 6. To the hook 7, there is caught the lower end 8a of a shift lever 8 of an arm-form which slides the pinion shifting member 4 on the output rotary shaft 3, so the upper end 8b of the shift lever 8 is caught to the pinion shifting member 4. And the middle portion in the longitudinal direction of the shift lever 8 is a swinging fulcrum 8c having roller-form projections on its both sides, and the shift lever 8 is swinging with the swinging fulcrum 8c as being the fulcrum. The front end of the starter 1 is covered with a front bracket 9, and a cover 9a of the upper half portion of the front bracket 9 covers the front end of the direct current motor 2, and a cover 9b of the lower half portion covers the front end of the electro-magnetic switch 5. On the cover 9a of the upper half portion of the front bracket 9, there are provided, in the middle portion of the cover 9a, with a bearing 10 supporting the front end of the output rotary shaft 3, and in the upper portion thereof, an opening 12 which opens upward so that a pinion 11 of the pinion shifting member 4 could be engaged with the ring gear of the engine in its full shifting position. Fig. 3 of the accompanying drawings is a perspective view seen from the inside of the middle portion of the front bracket 9. At a boundary between the cover 9a of the upper half portion and the cover 9b of the lower half portion of the front bracket 9, there is provided a lever box 13 which is surrounded by four walls and which has one open surface facing the inside of the starter and which houses the swinging fulcrum 8c of the shift lever 8 with the capability of swinging. And at the upper wall 13a and the lower wall 13b of the lever box 13, there are provided notches 14 of the size through which both arms of the shift lever 8 extending from the swinging fulcrum 8c toward their respective directions opposite to each other can pass, respectively. Those arms of the shift lever 8 which have gone through those notches 14, then, go through the cover 9a of the upper half portion and the cover 9b of the lower half portion of the front bracket 9, respectively, and, as has been described above, the upper end 8b of the shift lever 8 is caught to the pinion shifting member 4, so is the lower end 8a to the hook 7 of the electro-magnetic switch 5. And between the front end of the electro-magnetic switch 5 and the cover 9b of the lower half of the front bracket 9, there is produced a room 16 for housing the shift lever 8. A lever packing 15 comprised of a rubber plate whose front surface is coated with a steel plate is pressed onto the inner open surface 13c which is one open surface of the lever box 13 so as to close the lever box 13. At the conventional starter 1 with such a construction as described above, generally the electro-magnetic switch 5 is provided in the upper portion thereof. In a vehicle in which the electro-magnetic switch 5 is provided in the lower portion of the starter as shown in Fig. 1, in the case where water enters from the opening 12 of the front bracket 9 which opens upward, as shown in the arrows in Fig. 1, the water goes from internal of the cover 9a of the upper half portion of the front bracket 9 through the notches 14 of the lever box 13 to the room 16 formed between the cover 9b of the lower half potion of the front bracket 9 and the front end of the electromagnetic switch 5. And the water, then, goes along the circumference of the plunger 6 and enters into the electro-magnetic switch 5, the water preventing the electro-magnetic switch 5 from performing its normal operation. In order to prevent water from entering into the electro-magnetic switch 5, there is provided, in the lowest end of the cover 9b of the lower half portion of the front bracket 9, a hole for draining water 17 of a maze form which goes through windingly to the outside thereof. The hole for draining water 17 which is provided in the lowest end of the front bracket 9, however, has a limitation in its size because of the strength of the bracket 9. Accordingly, in the case where a large amount of water enters from the opening 12 of the front bracket 9, it takes a long time until the water is completely drained from there. Then, there exists a problem that the water filled in the room 16 of the front end of the electro-magnetic switch 5 enters into the electro-magnetic switch 5. A primary object of the invention, is to provide a starter, wherein if water enters from an opening, which opens upward, of a front bracket, the water is not liable to enter a room housing a shift lever formed between the front end of the electro-magnetic switch and the front bracket, thereby preventing the electro-magnetic switch from being filled with water even in the case where an electro-magnetic switch is arranged in the lower portion of the starter. FR-A-2329866 discloses a starting mechanism for an internal combustion engine in which a sealing ring is provided in an annular recess in the bearing point of the engaging lever. However, in this arrangement water will collect above the sealing ring. According to the present invention there is provided a starter with a shifting member slidably fitted to an output rotary shaft of a motor to shift a pinion slidably fitted to said output rotary shaft by operation of a shift lever whose upper portion is connected to said shifting member and whose lower portion is connected to an electro-magnetic switch disposed below the motor, comprising: a front bracket, the upper and lower portions of which are respectively provided to cover front ends of said motor and electro-magnetic switch which bracket has an opening in the upper portion thereof for exposing the pinion to the outside of the starter; a shift lever supporting member which has a hole and is provided at the boundary between the upper and lower portions of the front bracket for supporting the shift lever passing through said hole characterised in that; a waterproofing boot is provided for covering over said hole of the shift lever supporting member having an opening in a middle portion thereof, in which the shift lever is located, the walls of the opening tightly pressing against the shift lever; and in that said upper portion of the front bracket has a drain passage for draining water in said upper portion to the outside. Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a sectional view illustrating a construction of a conventional starter; Fig. 2 is a perspective view illustrating the state how the parts of one portion of the starter are integrated in the starter; Fig. 3 is a perspective view seen from the inside of the middle portion of a front bracket; Fig. 4 is a sectional view illustrating a construction of an embodiment of a starter of this invention; Fig. 5 is an enlarged perspective view of a waterproofing boot shown in Fig. 4; Fig. 6 is a sectional view illustrating another embodiment of a lever packing of the invention; and Fig. 7 is a sectional view illustrating a construction of another embodiment of the starter of this invention. Fig. 4 is a sectional view illustrating a construction of one embodiment of a starter 20 of this invention. An output rotary shaft 3 rotates according to torque of a direct current motor 2, and a pinion shifting member 4 is slidably fitted on the output rotary shaft 3. The pinion shifting member 4 is engaged with a ring gear of an engine (not shown) and transmits the torque generated in the direct current motor 2 to the engine. Beneath the direct current motor 2, there is arranged an electro-magnetic switch 5 which slides the pinion shifting member 4 on the output rotary shaft 3 and gives a power source to the direct current motor 2. At the front end of the electro-magnetic switch 5, there are arranged a plunger 6 drawn to the electro-magnetic switch 5 and a hook 7 moving with the plunger 6. The lower end 8a of a shift lever 8 of an arm-form which slides the pinion shifting member 4 is caught to the hook 7, and the upper end 8b of the shift lever 8 is caught to the pinion shifting member 4. And the middle portion in the longitudinal direction of the shift lever 8 is a swinging fulcrum 8c which has roller-form projections on its both sides, the shift lever 8 swinging with the swinging fulcrum 8c as the fulcrum. In the vicinity of the swinging fulcrum 8c of the upper arm of the shift lever 8, there is mounted a waterproofing boot 21 made of rubber in the form of a square umbrella. Fig. 5 is an enlarged perspective view of the waterproofing boot 21, and in the middle portion thereof is provided with an opening 21a of the size that the shift lever 8 can go through. And owing to elasticity of rubber, the circumference of the opening 21a is tightly adhered to the shift lever 8, so is the outer periphery of the waterproofing boot 21 to the upper wall 13a of a lever box 13 which will be described later. The front end of the starter 1 is covered with a front bracket 9, whose upper half portion, a cover 9a, covers the front end of the direct current motor 2, and whose lower half portion, a cover 9b, covers the front end of the electro-magnetic switch 5. Under the cover 9a of the upper half portion of the front bracket 9, there are arranged, in its upper portion, an opening 12 which opens upward so that a pinion 11 of the pinion shifting member 4 can be engaged with a ring gear of an engine in its full shifting position, and in its middle portion, a bearing 10 for supporting the front end of the output rotary shaft 3, and in its lower portion, a drain passage 22 for draining the water being filled in the cover 9a of the upper half portion of the front bracket 9 to the outside thereof, respectively. Fig. 3 is a perspective view seen from the inside of the middle portion of the front bracket 9. At a boundary between the cover 9a of the upper half and the cover 9b of the lower half of the front bracket 9, there is provided a lever box 13 which is surrounded by four walls and which has one open surface facing to the inside of the starter so that it can house the swinging fulcrum 8c of the shift lever 8 with the capability of swinging. At the upper wall 13a and the lower wall 13b of the lever box 13, there are provided two notches 14 of the size through which both arms of shift lever 8 extending from the swinging fulcrum 8c toward their respective directions opposite to each other can pass, respectively. Both of the arms of the shift lever 8 which have passed through the notches 14, then, go through the cover 9a of the upper half and the cover 9b of the lower half of the front bracket 9, respectively, and, as has been described above, the upper end 8b of the shift lever 8 is caught to the pinion shifting member 4, so is the lower end 8a to a hook 7 of the electro-magnetic switch 5. As a result, between the front end of the electro-magnetic switch 5 and the cover 9b of the lower half of the front bracket 9, there is produced a room 16 for housing the shift lever 8. A lever packing 15 of L-shaped cross section is pressed against the inner open surface 13c of the lever box 13 so as to close the lever box 13. The lever packing 15 has a pillar being composed of a rubber plate whose inner surface is put with a steel plate, and the steel plate is pressed against the inner open surface 13c. A leg of lever packing 15 made of rubber plate is placed over the upper wall 13a of the lever box 13 so as to cover one portion of those notches 14. And even when the waterproofing boot 21 is moved owing to swinging of the shift lever 8 and can not cover the notches 14, the leg of lever packing 15 can cover it so as to compensate for not covering the notches 14. Then, the inside of the cover 9a of the upper half is always cut off from the inside of the cover 9b of the lower half of the front bracket 9. Accordingly, the water which has entered from the opening 12 in the upper portion of the front bracket 9 is prevented from going through by the waterproofing boot 21 and is filled in the cover 9a of the upper half of the front bracket 9, however, it does not enter into the cover 9b of the lower half of the front bracket 9, thereby, the electro-magnetic switch 5 is not filled with the water. And the water filled in the upper half of the front bracket 9 is gradually drained, through the drain passage 22, to the outside thereof. In the case where the lever packing 15 is mounted when the starter is assembled, the waterproofing boot 21 together with the shift lever 8 are arranged in their predetermined positions, then the leg of lever packing 15 is slided under the outer periphery of the waterproofing boot 21, the lever packing 15 being pressed against the inner open surface 13c of the lever box 13 while the position of the lever packing 15 to be mounted being adjusted. And at that time, in the case where the leg of lever packing 15 made of rubber is employed, it is not smoothly slided under the outer periphery of the waterproofing boot 21, resulting in it taking longer time to mount the lever packing 15 to the starter. Fig. 6 is a sectional view of a lever packing 23 which can solve the above mentioned problem which the conventional lever packing has when it being mounted to the starter. In the lever packing 23, a pillar portion of a steel plate 24 of L-shaped section is covered with rubber 25, from which a leg 26 made of steel is exposed. Accordingly, the lever packing 23 can more smoothly be slided under the outer periphery of the waterproofing boot 21 than that whose leg is made of rubber, therefore, the lever packing 23 can easily be mounted to the starter. In addition, the mounting way of the starter 20 of this embodiment to an engine and a gear box casing is, what is called, the faucet type, however, a starter being mounted in the way of, what is called, the setting type will have the same advantages as this embodiment.

Claims: A starter with a shifting member (4) slidably fitted to an output rotary shaft (3) of a motor (2) to shift a pinion (11) slidably fitted to said output rotary shaft (3) by operation of a shift lever (8) whose upper portion is connected to said shifting member (4) and whose lower portion is connected to an electro-magnetic switch (5) disposed below the motor (2), comprising: a front bracket (9), the upper and lower portions (9a,9b) of which are respectively provided to cover front ends of said motor (2) and electro-magnetic switch (5) which bracket has an opening (12) in the upper portion (9a) thereof for exposing the pinion (11) to the outside of the starter (1); a shift lever supporting member (13) which has a hole (14) and is provided at the boundary between the upper and lower portions (9a,9b) of the front bracket for supporting the shift lever (8) passing through said hole (14) characterised in that; a waterproofing boot (21) is provided for covering over said hole (14) of the shift lever supporting member (13) having an opening in a middle portion thereof, in which the shift lever (8) is located, the walls of the opening tightly pressing against the shift lever (8); and in that said upper portion (9a) of the front bracket (9) has a drain passage (22) for draining water in said upper portion to the outside. A starter as set forth in claim 1, wherein said waterproofing boot is umbrella-shaped. A starter as set forth in claim 1, wherein said waterproofing boot (21) is square in shape. A starter as set forth in claim 1, 2 or 3, further comprising: a cover member (15), (23) for covering a part of the hole (14) of the shift lever supporting member (13). A starter as set forth in claim 4, wherein said cover member consists of rubber. A starter as set forth in claim 4, wherein said cover member consists of metal.

Inventors: SUGIYAMA, TAKESHI, SUGIYAMA, TAKESHI, C/O HIMEJI SEISAKUSHO
Applicants: MITSUBISHI DENKI KABUSHIKI KAISHA
Application year: 1990
Main classification: F02N15
IPC codes: F02N15, F02N11