JPH0460172A - Device for absorbing meshing shock of starter - Google Patents

Abstract

PURPOSE:To shorten total length of an inner and axial length of a starter so as to realize its miniaturization by forming a structure in which a gear part, meshed with the inner, is arranged in a rear end side from a washer for preventing the inner from springing out, that is, in the internal periphery of the inner. CONSTITUTION:This meshing shock absorbing device l is constituted of an overrunning clutch 5 for transmitting rotation of an outer 3 to an inner 4 through a roller 2, pinion 7 arranged in the internal periphery of the inner 4 and integrally provided with a gear part 6 to which rotation of the inner 4 is transmitted and an elastic unit 8 for relaxing a shock when this pinion 7 collides against a ring gear. A roller 2, pressed by a spring, is arranged in a plurality of cam chambers formed in a space from a peripheral surface of the inner 4, in an internal peripheral part of the outer 3. Each roller 2 is prevented from springing out from the cam chamber by a washer 10 arranged brought into contact with a point end surface of the outer 3, and the inner 4 is fixed by a washer 11 arranged overlapped with this washer 10.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a meshing shock absorbing device for a starter.

[Prior Art] Conventionally, in starters that start internal combustion engines, when the pinion moves forward and collides with the ring gear, a technology has been developed to reduce the meshing impact between the pinion and the ring gear and prevent damage to the pinion or the ring gear. has been devised.

As the conventional technology, for example, Utility Model Publication No. 55-50376
The starter disclosed in the publication is shown in FIG.

This starter separates the inner 101 and pinion 102 of the overrunning clutch 100, and
．． 102 is spline-coupled, and the pinion 10
2 is provided so as to be movable in the axial direction with respect to the inner 101.

A spring 103 is interposed between the pinion 102 and the inner 101, and this spring 103 is bent when the front end surface of the pinion 102 collides with the rear end surface of a ring gear (not shown), thereby balancing the meshing of the two. This is to alleviate the impact.

[Problems to be Solved by the Invention] However, in the starter described above, the inner 101 is extended toward the tip side (left side in FIG. 7) from the washer 104 that prevents the inner 101 from popping out. Connection with the binion 102 is performed at the tip. Therefore, the axial length becomes longer due to the extension of the inner 101, leading to an increase in the size of the starter. In addition, the binion 102 and the inner 10
A snap ring 105 is attached to the connection part with 1 to prevent the binion 102 from being removed, but the installation space is narrow and assembly is difficult, which impairs the degree of freedom in designing the starter and reduces productivity. There were issues such as:

The present invention has been made based on the above circumstances, and its purpose is to shorten the shaft length to prevent the starter from increasing in size, and to improve productivity by simplifying assembly. An object of the present invention is to provide an interlocking shock absorbing device.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes an inner member having internal teeth formed on the inner circumferential surface, and an inner member disposed at the tip of the inner member,
The clutch has an overrunning clutch including a washer for preventing the inner from popping out, and a gear portion having outer teeth formed on the outer circumferential surface to engage with the inner teeth of the inner and being engaged with the washer at a side surface of the tip. A binion that rotates together with the inner and is movable in the axial direction with respect to the inner through a gear portion, and a binion that is interposed between the overrunning clutch and the nion in the axial direction. The technical means is to have an elastic body.

[Operations and Effects of the Invention] The present invention having the above configuration has a structure in which the gear portion that meshes with the inner is disposed on the rear end side of the washer, that is, on the inner periphery of the inner. Therefore, compared to conventional starters in which the tip of the inner is extended and the binion and the inner are connected on the tip side of the washer, the total length of the inner can be shortened, and the shaft of the starter The length is shortened, and the starter can be made smaller.

Furthermore, the pinion is prevented from coming out by locking the gear portion with a washer that prevents the inner from popping out. Therefore, compared to conventional starters that use snap rings to prevent the binion from being pulled out, the number of parts is reduced and assembly is easier, which improves starter design freedom and productivity. 6 [Example] Next, a meshing shock absorbing device for a starter according to the present invention will be described based on an example shown in the drawings.

FIG. 1 is a sectional view showing a meshing shock absorbing device for a starter, and FIG. 2 is a sectional view taken along line AA in FIG.

The starter meshing shock absorbing device 1 includes an overrunning clutch 5 that transmits the rotation of the outer 3 to the inner 4 via the rollers 2, and a gear section disposed on the inner periphery of the inner 4 to which the rotation of the inner 4 is transmitted. 6 and an elastic body 8 for mitigating the impact when the pinion 7 collides with a ring gear (not shown).

The outer 3 of the overrunning clutch 5 is integrally provided with a spline tube 9 fitted to the outer periphery of a shaft (not shown) via a helical spline, and torque generated in the shaft is transmitted via the spline tube 9.

A plurality of cam chambers (not shown) are formed in the inner circumferential portion of the outer 3 and between the outer circumferential surface of the inner 4, and each cam chamber includes:
Rollers 2 each pressed by a spring (not shown) are disposed.

In this overrunning clutch 5, the inner peripheral surface of the cam chamber is formed in a tapered shape, and as the outer 3 rotates,
By pressing each roller 2 toward the narrower side of the cam chamber, the outer 3 and inner 4 are locked, and the outer 3
rotation is transmitted to the inner 4. Furthermore, when the rotation of the inner 4 becomes faster than the rotation of the outer 3 after the engine is started, the roller 2 compresses the spring and moves to the wider side of the cam chamber, thereby freeing the outer 3 and the inner 4, and the armature ( (not shown) to prevent overruns.

Each roller 2 is prevented from coming out of the cam chamber by a washer 10 placed in contact with the front end surface of the outer 3, and the inner 4 is fixed by a washer 11 placed over the washer 10. There is. Note that the washer 10 and the washer 11 are held by a clutch cover 12 that covers the outer periphery of the outer 3.

The binion 7 consists of a tooth portion 7a that meshes with the ring gear and a gear portion 6, and the outer peripheral surface of the gear portion 6 has internal teeth 4a formed on the inner peripheral surface of the inner 4, as shown in FIG. External teeth 6a are formed to mesh with each other, and the two are spline-coupled.

This binion 7 is fitted onto the outer periphery of the shaft via a bearing 13 press-fitted into the inner periphery of the binion 7, rotates integrally with the inner 4 via the gear part 6, and rotates in the axial direction with respect to the inner 4. It is provided so as to be movable by a predetermined amount (shown in FIG. 1a).

The gear portion 6 of the pinion 7 is disposed on the rear end side of the washer 11 and is included in the overrunning clutch 5. By locking the front end side surface of the gear portion 6 with the washer 11, the pinion 7 7 is prevented from jumping out.

The elastic body 8 (for example, made of rubber) is formed in an annular shape, is disposed between the teeth 7a of the pinion 7 and the washer 11, and is positioned by an annular groove formed on the side surface of the teeth 7a. ing.

Moreover, this elastic body 8 has a state in which the side surface of the tip of the gear portion 6 is in contact with the washer 11! ! ! (the shape W shown in FIG. 1), the axial thickness W is a minute interval of Δd between both end surfaces of the elastic body 8, the side surfaces of the toothed portion 7a (bottom surface of the groove), and the side surface of the washer 11, respectively. It is sized to have .

This is to prevent wear of the elastic body 8 due to relative rotation between the binion 7 and the outer 3 when the binion 7 meshed with the ring gear overruns after the engine is started.

Next, the operation of this embodiment will be explained.

When the starter switch is turned on, the overrunning clutch 5 is pushed forward on the shaft via a shift lever (not shown). Along with this, the binion 7 moves forward and meshes with the ring gear (if the binion 7 and the ring gear mesh smoothly).

On the other hand, when the main contact of a magnetic switch (not shown) is closed, current flows through the armature and the shaft rotates, thereby transmitting the rotational force of the armature to the ring gear and starting the engine.

In the above operation, when the pinion 7 collides with the ring gear, the main contact of the magnetic switch closes while the two remain in collision, current flows through the armature, and the shaft rotates. Due to this rotation and the action of the helical spline, the pressure on the tooth contact surface gradually becomes stronger, but as the pinion 7 rotates, the position of the colliding teeth shifts,
The binion 7 and the ring gear will mesh with each other.

Here, the impact caused by the collision between the binion 7 and the ring gear is absorbed by an elastic body between the overrunning clutch 5 including the inner 4 and the binion 7, since the binion 7 is provided so as to be movable in the axial direction with respect to the inner 4. 8, the elastic body 8 bends to absorb and relieve the stress.

As a result, damage and wear of the binion 1 and the ring gear due to collision can be prevented. Further, even if the binion 7 overruns after the engine is started, a gap is generated on both sides or one side of the elastic body 8, so that wear of the elastic body 8 due to relative rotation between the binion 7 and the outer 3 can be prevented.

The meshing shock absorbing device 1 of this embodiment has a structure in which the inner 4 and the gear portion 6 are connected on the rear end side of the washer 11. That is, since the gear part 6 is included in the overrunning clutch 5, the pinion 7 is disposed on the distal end side of the washer 11.
Compared to a conventional starter that connects the and inner 4,
The total length of the inner 4 can be shortened, and accordingly,
The axial length of the starter is shortened, making it possible to downsize the starter.

Furthermore, by locking the gear portion 6 with the washer 11 that fixes the inner 4, the pinion 7 is prevented from being pulled out. Therefore, the number of parts can be reduced compared to a conventional starter that uses a snap ring to prevent the binion 1 from being pulled out. Therefore, assembly becomes easy, and the degree of freedom in designing the starter and productivity can be improved.

Note that the elastic body 8 is not limited to an annular body made of rubber; for example, materials with spring elasticity such as disc springs, wave washers, helical springs, etc. are suitable in terms of shock absorption ability and durability. It may be processed and used as desired.

FIG. 3 shows a second embodiment of the invention.

In the first embodiment described above, an annular groove was formed on the side surface of the teeth 7a of the pinion 7 to position the elastic body 8, but in this embodiment, as shown in FIG. be.

A third embodiment of the present invention is shown in FIGS. 4 to 6.

In this embodiment, as shown in FIGS. 5 and 6, a portion of the washer 11 is cut and raised as appropriate, and the cut and raised portion 11a is given a spring action.

When the pinion 7 and the ring gear collide, as shown in FIG.
When it hits the side of a car, it deforms elastically and can absorb the impact of a collision.

In this way, by providing the functions of the washer 11 and the elastic body 8 shown in the first and second embodiments in one component, the number of components can be further reduced.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a half sectional view of the meshing shock absorbing device, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 4 is a sectional view of a main part showing a second embodiment of the present invention, FIGS. 4 to 6 are a sectional view of a third embodiment of the present invention, FIG. 4 is a half sectional view of a meshing shock absorbing device, and FIG. 6 are a front view and a sectional view of one side of the washer, and FIG. 7 is a sectional view of one side of a meshing shock absorbing device according to the prior art. In the diagram...Meshing shock absorber...Inner 5...Overrunning clutch...
... Gear part 7 ... Binion ... Elastic body 11 ... Washer Fig. 2 1゜

Claims (1)

[Scope of Claims] 1) (a) An overrunning clutch comprising: (a) an inner having internal teeth formed on its inner peripheral surface; and a washer disposed at the tip of the inner to prevent the inner from jumping out; (b) has a gear portion formed on the outer circumferential surface that meshes with the inner teeth of the inner, and has a gear portion that is locked to the washer on the tip side surface, and rotates integrally with the inner through the gear portion; and (c) an elastic body interposed between the overrunning clutch and the pinion in the axial direction to absorb a meshing shock of the starter. Device.