JP3000495U - Engine starter - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] In an engine starter supported by a plain bearing on the front wall of the casing via a pinion drive shaft that fits and slides on a gear shaft driven by a starter motor, Improve the wear resistance of the pinion drive shaft and bearing during run. A clutch inner portion 13a is formed on a ring gear 29 side of a portion supported by a plain bearing 15 provided on a front wall 1a of a pinion drive shaft 13,
A pinion 17a is formed at a front end of a clutch case 17 surrounding a plurality of clutch rollers 25 arranged on the outer peripheral surface of the clutch inner portion. Further, the clip groove 40 is formed in the tip end portion 13b of the pinion drive shaft, and the clip 42 is fitted therein, and the pinion 17a locks the clutch case 17 integrally provided in series. Furthermore, plain bearings 15
An oil seal 50 is provided on the front wall 1a adjacent to, and a vent hole 51 is formed from the front end surface of the gear shaft 8 to the hollow portion 16 formed in the pinion drive shaft to provide an oil-proof type.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine starting device, and more particularly, a front end portion of a gear shaft driven by a starting motor is supported by a front wall of a casing via a pinion drive shaft slidably and rotatably fitted to the gear shaft, An advance sleeve, which is slidably fitted to the gear shaft, is connected to the pinion drive shaft, and this advance sleeve is axially shifted by an electromagnetic actuator to form the front end of the pinion drive shaft. The present invention relates to an improvement of a structure in which a pinion is moved between a retracted position where it is disengaged from an engine ring gear and an advance position where it is meshed with the ring gear.

[0002]

[Prior art]

 Such an engine starting device has already been proposed by the present applicant (see Japanese Patent Application No. 4-153877).

[0003]

[Problems to be solved by the device]

 Such a starter is effective in achieving compactness in the axial direction by supporting the front end of the gear shaft by a plain bearing on the front wall of the housing via the pinion drive shaft fitted thereto. However, a clutch case that is integrated with the advance sleeve that is fitted to the outer circumference of the gear shaft through a helical spline is such that a plurality of clutch rollers arranged along the inner peripheral surface of this clutch case are sandwiched. Since the rear end of the pinion drive shaft is inserted, the rotation of the pinion is directly received by the plain bearing during overrun, and wear resistance may be a problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide the engine starter in which the wear resistance of the pinion drive shaft and the bearing is improved.

[0005]

Means for Solving the Problems In order to achieve the above object, the present invention relates to the engine starting device, wherein the front end of the pinion drive shaft is formed as a clutch inner part, and the clutch inner part is formed along the outer peripheral surface of the clutch inner part. A first feature is that a plurality of clutch rollers are provided, and a pinion is formed at a front end of a clutch case surrounding these clutch rollers.

In addition to the above features, the present invention has a second feature that a clip groove is formed at the tip end portion of the pinion drive shaft and a clip is fitted therein.

Further, in addition to the above-mentioned first or second feature, the present invention provides an oil seal on the front wall adjacent to the plain bearing, and forms the pinion drive shaft from the front end face of the gear shaft. The third feature is that a vent hole reaching the hollow portion is formed.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

First, a first embodiment of the present invention shown in FIG. 1 will be started. In FIG. 1, a casing 1 of the engine starting device has a front wall 1a, an intermediate wall 1b and a rear wall 1c in order from the right side in the figure, and a shift chamber 2 is provided between the front wall 1a and the intermediate wall 1b and an intermediate wall 1b. Gear chambers 3 are respectively defined between 1b and the rear wall 1c. The front end of the stator of the starting motor 4 is joined to the rear wall 1c, and the front end of the rotor shaft 6 of the starting motor 4 is rotatably supported via a ball bearing 7. A rear end portion of the gear shaft 8 penetrating the shift chamber 2 is rotatably supported by the intermediate wall 1b via a plain bearing 9.

The rotor shaft 6 and the gear shaft 8 are eccentric to each other by a predetermined distance and are arranged in parallel with each other, and are connected in the gear chamber 3 via a speed reducer 10. The speed reducer 10 is composed of a large-diameter internal gear 11 that is connected to the gear shaft 8 and a small-diameter external gear 12 that is machined on the rotor shaft 6 and meshes with the internal gear 11. To be done.

The pinion drive shaft 13 is rotatably and slidably supported on the front wall 1 a of the casing 1 via a plain bearing 15. The gear shaft 8 is slidably supported by a pinion drive shaft 13 at a front end thereof via a plain bearing 14. Therefore, the front wall 1a supports the front end portion of the gear shaft 8 via the pinion drive shaft 13.

The plain bearing 14 is fixed to the inner peripheral surface of the central portion of the pinion drive shaft 13, and a hollow portion 16 adjacent to the rear end of the plain bearing 14 and having an open rear end is provided on the pinion drive shaft 13. .

A plain bearing 15 is fixed to the front wall 1a of the casing, and a lubricating oil sump 19 is formed in a part of the plain bearing 15 to rotatably and slidably support the pinion drive shaft 13.

An advance sleeve 21 slidably fitted to the outer periphery of the gear shaft 8 via a helical spline 20 is coupled to the rear end of the pinion drive shaft 13 and is locked by a clip 22 so that the rotational force is It is being transmitted. The helical spline 20 is capable of converting a part of the rotational torque of the gear shaft 8 into a forward (rightward in the figure) thrust on the advance sleeve 21.

A stepped small-diameter clutch inner portion 13a is provided in front of a portion supported by the front wall 1a of the pinion drive shaft 13 (right side in the drawing), and a stepped small-diameter tip portion 13b is provided further forward. The pinion drive shaft 13 is provided with a plurality of clutch rollers 25 arranged along the outer peripheral surface of the clutch inner portion 13a, and the pinion 17a is integrally formed at the front end of the clutch case 17 that surrounds the clutch rollers 25 so as to sandwich them. An overrunning clutch 23 is provided that can form and transmit torque only in one direction.

A plain bearing 18 is fixed to the inner peripheral surface of a pinion 17 a integrally formed at the front end of the clutch case 17, and is rotatably supported via a pinion drive shaft 13.

A clip groove 40 is provided in the tip portion 13b of the pinion drive shaft 13, and a click latch case 17 integrally formed with a pinion 17a by fitting a clip 42 through a plain washer 41 (see FIG. Then, the right side) is regulated.

At the rear end of the clutch case 17, a cover plate 27 and a clip 28 in which a rubber packing is sandwiched between two metal washers are rotatably held while restricting the axial movement of the clutch roller 25. There is.

Therefore, the overrunning clutch 23 having the pinion 17a can slide on the gear shaft 8 together with the pinion drive shaft 13 between the retracted position A and the advanced position B. 17a is disengaged from the ring gear 29 of the engine, and at the forward drive position B, the pinion 17a meshes with the ring gear 29.

The retracted position A of the pinion 17a is regulated by the rear surface of the advance sleeve 21 contacting an annular shoulder 30 formed on the gear shaft 8 adjacent to the rear side of the helical spline 20. B is regulated by the front end of the advance sleeve 21 coming into contact with an annular pinion stopper 32 fixed to the gear shaft 8 by a locking ring 31 in the hollow portion 16 of the pinion drive shaft 13.

An electromagnetic actuator 33 for moving the pinion 17a back and forth is arranged parallel to the side of the starter motor. The yoke 34 of the electromagnetic actuating device 33 is fixed to the rear end of the lateral bulging portion 1d that is continuous with the front wall 1a of the casing 1. A solenoid (not shown) and a fixed core (not shown) are housed and supported in the yoke 34, and a movable core 35 facing the fixed core is arranged in the hollow portion of the solenoid. The movable core 35 is integrally provided with an operating rod 35a protruding into the bulging portion 1d, and the operating rod 35a is connected to the advance sleeve 21 via a lever 36.

That is, one end of the lever 36 is engaged with the connecting groove 37 at the front end of the operating rod 35 a, and the other end is engaged with the annular groove 38 on the outer periphery of the advance sleeve 21 via the roller 39. An intermediate portion of the lever 36 is swingably supported by a slider 43, which is supported by the casing 1 so as to be movable back and forth within a range of a small stroke, between a working rod 35a and the advance sleeve 21 via a pivot shaft 44. The slider 43 is biased forward (to the right in the figure) by a damper spring 45. Therefore, when a large rearward impact force is applied to the lever 36, the slider 43 retracts while compressing the damper spring 45, so that the impact force can be alleviated.

A return spring 46 for urging the actuating rod 35 a forward is attached to the actuating rod 35 a, and its elastic force acts on the advance sleeve 21 via the lever 36 as a retracting force.

At the rear end of the electromagnetic actuator 33, a starter switch (not shown) for operating the starter motor 4 is connected, and the solenoid is connected to a power source through a starter switch (not shown).

Next, the operation of this embodiment will be described.

When a start switch (not shown) is closed, the movable core 35 of the electromagnetic actuator 33 is attracted, and the lever 36 swings counterclockwise in FIG. 1 around the pivot shaft 44 against the return spring 46. Since the advance sleeve 21 is moved forward by the lever 36, the pinion drive shaft 13 is moved to the forward movement position B regulated by the pinion stopper 32, and the pinion 17a is meshed with the ring gear 29 of the engine. When the gear shaft 8 slides in the pinion drive shaft 13, air flows in and out through the ventilation holes 26.

When the pinion 17 a meshes with the ring gear 29 of the engine, the movable core 35 presses and closes the start switch in the electromagnetic actuator 33 to operate the start motor 4.

When the starter motor 4 operates, the rotor shaft 6 decelerates and drives the gear shaft 8 via the speed reducer 10, and further, via the advance sleeve 21 and the pinion drive shaft 13, to the clutch case 17 of the overrunning clutch 23. Since the pinion 17a formed integrally is driven, the ring gear 29 meshing with the pinion 17a rotates, the engine is cranked, and the engine can be started.

When the pinion 17a is rotated at a high speed from the ring gear 29 side with this start-up, the overrunning clutch 23 is brought into a free state, so that transmission of reverse load to the gear shaft 8 is prevented.

When the start switch is turned off after the start, the movable core 35 and the advance sleeve 21 are returned to their original positions by the return action of the return spring 46, so that the pinion 17 a retracts and disengages from the ring gear 29. On the other hand, since the start switch is deenergized, the starter motor 4 is stopped.

By the way, after the engine is started and before the pinion 17a is disengaged from the ring gear 29, if the peripheral speed of the ring gear 29 becomes faster than the peripheral speed of the pinion 17a, a so-called overrun state occurs, so that the pinion 17a reverses from the ring gear 29. Will be subject to rotational force.

At this time, the overrunning clutch 23 is in a free state and high-speed rotation is not transmitted to the pinion drive shaft 13, so that the wear resistance of the plain bearing 15 supporting the pinion drive shaft 13 is improved.

FIG. 2 shows a second embodiment of the present invention, in which an oil seal 50 is attached to the front wall 1a, the pinion drive shaft 13 has a cylindrical shape with a bottom, and a vent hole 51 is provided in the gear shaft 8. Except for the above, the configuration is the same as that of the previous embodiment, and in the figure, portions corresponding to those of the previous embodiment are denoted by the same reference numerals. According to this embodiment, it is possible to realize the oil-proof engine starting device that prevents the lubricant oil from entering from the engine side.

[0034]

[Effect of device]

 As described above, according to the first feature of the present invention, the front end of the pinion drive shaft, which is slidably and rotatably supported by the plain bearing mounted on the front wall of the casing, is formed as the clutch inner portion, and the clutch is formed. A plurality of clutch rollers are provided along the outer peripheral surface of the inner part, and a pinion is formed at the front end of the clutch case surrounding these clutch rollers, so that the high speed rotation of the pinion during overrun can be transmitted to the pinion drive shaft. Can be prevented and the wear resistance of the pinion drive shaft and bearing is improved. Further, since the pinion is integrally provided with the clutch case, forging can be performed at the same time during manufacturing, which can contribute to cost reduction.

Further, according to the second feature of the present invention, since the clip groove is formed at the tip of the pinion drive shaft and the clip is fitted, the pinion is integrally connected by removing the clip. Since the overrunning clutch can be replaced without disassembling the engine starter body, repair serviceability is improved.

Further, according to the third feature of the present invention, an oil seal is provided on the front wall adjacent to the plain bearing, and a vent hole extending from the front end face of the gear shaft to the hollow portion formed on the pinion drive shaft is provided. Since it is formed, it is possible to provide an oil-proof type engine starting device that prevents intrusion of lubricating oil from the engine side with a single oil seal.

[Brief description of drawings]

FIG. 1 is a side view in which a main part of an engine starting device according to a first embodiment of the present invention is longitudinally cut.

FIG. 2 is a side view similar to FIG. 1, showing a second embodiment of the present invention.

[Explanation of symbols]

 1 ... Casing 1a ... Front wall 4 ... Starter motor 8 ... Gear shaft 13 ... Pinion drive shaft 13a ... Clutch inner part 13b ... Tip Part 15 ... Plain bearing 16 ... Hollow part 17 ... Clutch case 17a ... Pinion 20 ... Helical spline 21 ... Advance sleeve 25 ... Clutch roller 33.・ ・ ・ Electromagnetic actuator 40 ・ ・ ・ Clip groove 42 ・ ・ ・ Clip 50 ・ ・ ・ ・ Oil seal 51 ・ ・ ・ ・ Vent hole A ・ ・ ・ Retracted position B ・ ・ ・ Advance position

Claims (3)

[Scope of utility model registration request] 1. A casing (1) via a pinion drive shaft (13) slidably fitted to the gear shaft (8) at the front end of a gear shaft (8) driven by a starting motor (4). Is supported by a plain bearing (15) on the front wall (1a) of the above, and the gear shaft (8) is supported on the pinion drive shaft (13).
An engine starter in which an advance sleeve (21) slidably fitted to a spline is connected to the shaft, and the advance sleeve (21) is axially shifted by an electromagnetic actuator (33), wherein the pinion drive shaft ( A clutch inner portion (13a) is formed at the front end of 13), and a plurality of clutch rollers (25) are provided along the outer peripheral surface of the clutch inner portion (13a),
An engine starting device characterized in that a pinion (17a) is formed at a front end of a clutch case (17) surrounding the clutch roller (25). 2. The clip groove (4) according to claim 1, wherein a tip portion (13b) of the pinion drive shaft (13) is provided.
0) is formed and a clip (42) is fitted therein. 3. The plain bearing (1) according to claim 1 or 2, wherein the front wall (1a) is provided with the plain bearing (1).
An oil seal (50) is provided adjacent to 5), and a vent hole (5) extending from the front end face of the gear shaft (8) to the hollow portion (16) formed in the pinion drive shaft (13) is provided.
An engine starting device characterized by forming 1).