JPS6332985B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starting device for an internal combustion engine with a torque limiter.

[Conventional techniques and their problems]

Conventionally, as a starting device for an internal combustion engine using an electric motor, a spline part provided with a cylindrical body and a spline part provided indirectly on a pinion shaft that meshes and supports a ring gear pinion that meshes with the ring gear of the internal combustion engine. Torque limiters each having multiple friction plates and engaging these multiple friction plates are well known (for example, see Japanese Patent No. 120994).

However, such a conventional starting device for an internal combustion engine with a torque limiter is provided with a separate speed reducer, so that the entire device cannot be configured compactly.

In addition, as a starting device for an internal combustion engine, a cylindrical body that supports a pinion shaft extending from an internal gear and supporting a ring gear pinion that meshes with the ring gear of the internal combustion engine, and a cylindrical body provided on the inner periphery of the cylindrical body. Torque limiters are known in which multi-friction plates are provided on a spline portion provided on a spline portion and a spline portion provided on a screw nut screwed into the pinion shaft, respectively, and these multi-friction plates are engaged (for example, as disclosed in Japanese Patent No. 133329). reference).

However, in such a conventional internal combustion engine starting device with a torque limiter, although the internal gear, the cylindrical body for the pinion shaft end bearing, and the spline part are integrally formed, the internal gear and the cylindrical body are Since a partition wall is created and a bearing protrusion into which the pinion shaft can be externally fitted protrudes from the partition wall, the length in the pinion axis direction becomes long, and the number of parts such as the partition wall and bearing protrusion increases, resulting in increased costs. ,
Moreover, it inevitably becomes heavy, which is not preferable when attached to an internal combustion engine. Of course, no technology has been disclosed for assembling the internal combustion engine starting device with such a torque limiter.

[Means for solving problems]

The present invention was created to eliminate these drawbacks, and provides a starting device for an internal combustion engine using a vane-type pneumatic motor equipped with a torque limiter, which is small and has a small number of parts. The gist of this is that an internal gear is provided on the extended end of the rotor shaft 3 of the vane-type pneumatic motor in a casing 12 that extends and is fixed to the side of the side housing 6 of the vane-type pneumatic motor. An internal gear 11 meshing with the pinion 11', and a ring gear pinion D extending from the internal gear 11 with substantially the same outer diameter.
The pinion shaft 14 is meshed and supported by a cylindrical body 13 that supports the pinion shaft 14 via a pinion shaft ball bearing ₇₂ that is slidably inserted in the axial direction of the pinion shaft 14. Extend with
and a spline portion 16 in which a multi-friction plate 18 is implanted to engage with a multi-friction plate 18′ implanted in a spline portion 17 formed directly on the pinion shaft 14;
and are formed from the same cylindrical member and are built in via a pair of cylindrical member ball bearings 7 ₁ , and the pinion shaft ball bearing 7 ₂
and a plate spring interposed between the stepped portion on the inner periphery of the cylindrical body 13.

〔Example〕

The configuration of the present invention will be explained in detail with reference to examples.
The illustrated one is a vane-type pneumatic starter, which is composed of a pneumatic motor A, a reduction mechanism B, a torque limiter C, and a pinion D. These will be explained in detail below.

The pneumatic motor A is a vane type air motor, which houses a rotor 2 eccentric to the cylinder 1 in a cylinder 1, and the rotor 2 has ball bearings mounted on both side housings 5, 6 by its rotor shafts 3, 4. It is rotatably supported via 7, 7.
A plurality of blades 8 are provided on the rotor 2 so as to be slidable radially around the center of the rotor 2, and the outer ends of the blades 8 are always housed in the cylinder 1 while the motor is being driven. The cylinder 1 is provided with a plurality of inlet passage grooves 9 on the inlet side and a plurality of outlet passage grooves 10 on the outlet side.

Next, the reduction mechanism B has the extended end of the rotor shaft 4 carved as a pinion 11' for the internal gear 11, and rotates the internal gear 11 at a reduced speed as the rotor 2 rotates. The internal gear 11 is supported by a casing 12 via ball bearings 7 ₁ , 7 ₁ .

Here, the internal gear 11 is carved approximately to the center of the inside of the cylindrical body 13, and a ball bearing ₇₂ that supports a pinion shaft 14, which will be described later, is inserted into the remaining portion so as to be slidable in the axial direction of the pinion shaft 14. As a result, a spline portion 16 is formed on the ring gear 15 side of the engine, in which a multi-friction plate 18 for the torque limiter C is installed.

Next, the torque limiter C is a starting device that rotates the ring gear 15 of this type of engine.
In particular, starting devices using vane-type pneumatic motors are susceptible to shock starting torque of the starting motor, discontinuous torque transmission of compressed air, and elliptical rotation between the pinion D and the engine when starting operations are repeated. It is necessary to absorb the impact force caused by the engagement and disengagement with the ring gear 15, and in the torque limiter C of this embodiment, a multi-friction plate 18 installed in a spline portion 16 extending from the cylindrical body 13;
Spline portion 17 formed directly on pinion shaft 14
A method is adopted in which the above-mentioned starting torque and impact force are absorbed by blocking or converting them into heat by slipping with a multi-friction plate 18' installed in the actuator. Furthermore, when the pinion D meshes with the ring gear 15 of the engine,
A reaction force is generated on the pinion shaft 14 which engages and supports the pinion D, but in order to cope with this, the pinion shaft 1
A donut-shaped spring receiver 19 that comes into contact with the outer race 7 ₂ ′ of the ball bearing 7 ₂ that supports the end of the ball bearing 7 2 is housed in contact with the stepped portion in the cylindrical body 13 and is arranged in parallel therewith. , two donut-shaped disk springs 21 are installed in the single pipe 20, and the pinion shaft 14
The reaction force is transmitted to the ball bearing 7 ₂ -> spring receiver 19 -> disc spring -> cylindrical body 13 and absorbed. Reference numeral 22 denotes springs for pressing the friction multi-plates 18, 18', which are fitted into a plurality of protrusions 24 protruding from the disc spring 23, respectively. The position of the disc 23 is adjusted by a nut 25 screwed onto the pinion shaft 14, and the pressing force of the spring 22 is adjusted.
Adjusts the transmitted torque of torque limiter C. Note that the nut 25 is fixed with a holosett bolt in a direction perpendicular to the axial direction.

Next, regarding the pinion D, a threaded spline 26 is carved into the pinion shaft 14, and when the pneumatic motor A begins to rotate due to this threaded spline 26, the pinion shaft 14 is decelerated and rotates at high speed. If the pinion D, which has been stationary until then, engages with the ring gear 15 due to its inertia to remain stationary, the pinion D will increasingly shift to the ring gear 15, and will eventually engage with the ring gear 15, causing the ring gear 15 to rotate. I come to do it. Also, after the engine starts, the rotation of the ring gear 15 is
400 to 500 rpm, and the pinion D itself is 5000 to 500 rpm.
6000 rpm, but since the pinion shaft 14 has a constant rotation speed lower than that, the pinion D acts to move away from the ring gear 15 in the opposite direction to the above-mentioned protruding action. As a result, pinion D disengages from ring gear 15, and engine starting is completed.
Here, to further describe the transmission of power from the pneumatic motor A, the power from the pinion shaft 14 is as follows:
The signal is transmitted to the pinion stopper 27, and the pinion stopper 27 and pinion D are integrated to transmit the signal to the ring gear 15. A coil spring 28 is interposed between the pinion D and the pinion stopper 27 and is wound in the opposite direction to the threaded spline 26 that functions to return the pinion D. Furthermore, since the pinion stopper 27 is fixed to the pinion shaft 14 via a screw that rotates in the opposite direction of the pinion shaft 14, the pinion stopper 27 will not come off.

In the vane-type pneumatic motor starting device of this embodiment having the above-described configuration, high-pressure air from the starting air tank (not shown) is supplied to the inlet passage groove 9 of the pneumatic motor A, and the rotor shaft 2 is moved at high speed. Rotate. As a result, the pinion 11' and the internal gear 11
The rotation is decelerated by the engagement with the pinion shaft 14, and the pinion shaft 14 is rotated via the torque limiter C. The pinion D that meshes with the threaded spline 26 on the pinion 14 is the ring gear 15 of the engine.
It fits into the engine, starts to engage, and starts the engine. After the engine is started, the pinion D returns to its original position and disengages from the ring gear 15, stopping the supply of high-pressure air and completing the operation of the air starter.

By the way, in this embodiment, as described above, the spline portion 16 is further formed on the cylindrical body 13 that is integrated with the internal gear 11, and the spline portion 16 is also directly formed on the pinion shaft 14 that meshes and supports the pinion D. Part 1
7, frictional multi-plates 18, 18' are alternately superimposed and arranged in parallel on these spline parts 16, 17, respectively, these frictional multi-plates 18, 18' are pressed by a pressing spring 22, and an internal gear is formed. The power from the pinion shaft 11 is transmitted to the pinion shaft 14 by friction. Therefore, when the pinion D is fitted into the ring gear 15, the impact torque, etc., is caused by the multi-friction plates 18, 18' slipping because the pressing force of the pressing spring 22 is constant, so that excessive torque is not transmitted. That's what I do.

Further, one end of the pinion shaft 14 is connected to the casing 12.
The other end is supported by the cylindrical body 1 as described above.
3 and is supported via a ball bearing ₇₂ .

In summary, since the present invention adopts the configuration described in the claims, the following effects are achieved.

[Effect of the invention] As a starting device for an internal combustion engine with a torque limiter, the internal gear, the cylindrical body of the ball bearing for the pinion shaft, and the spline part are integrally formed, and the necessary parts are built-in without the need for a connecting part such as a flange. Moreover, since these parts have approximately the same outer diameter and are formed from the same cylindrical member, the structure is extremely simple and easy to manufacture (especially easy to assemble), which not only reduces costs but also makes it more compact.・It can be expected to be lightweight and can be conveniently mounted on an internal combustion engine.

On the other hand, pneumatic motors can achieve 4 to 5 times the output compared to electric motors by simply increasing the pressure of high-pressure air, but in other words, pneumatic motors can be made smaller and more compact to obtain the same output. Therefore, in combination with the above-mentioned reduction in size and weight, the internal combustion engine can be made even smaller and more compact, and the entire internal combustion engine can be made smaller.

In addition, a leaf spring is interposed between the ball bearing that supports the pinion shaft, which performs instantaneous high-speed rotation of the vane-type pneumatic motor, and the step on the inner circumference of the cylindrical body, so that the reaction force from the pinion ring gear is reduced. In addition to being able to absorb energy, the axial length of the internal gear, cylindrical body, and cylindrical member forming the spline portion can be shortened, which can be expected to reduce weight, which is convenient when suspended from an internal combustion engine. It can be done.

In addition, since the diameter of the internal gear, which requires the maximum diameter of the cylindrical member used as a material, is used as the diameter of the spline part, and the spline part is directly formed on the pinion shaft, the friction The contact area of multiple plates is large,
As a result, not only can the number of frictional plates be reduced and the size can be made smaller in the axial direction, but it can also be conveniently used as a severe torque limiter for vane-type pneumatic motors, which have many torque fluctuations.

Furthermore, since the diameter of the internal gear, which requires the largest diameter of the cylindrical member used as a raw material, is used as the diameter of the cylindrical body and spline portion, the diameter of the pinion shaft can also be increased, and large torque can be transmitted.

[Brief explanation of the drawing]

The accompanying drawings show general cross-sectional views of embodiments of the invention. 7... Ball bearing, 13... Cylindrical body, 1
4...Pinion shaft, 16...Spline part, 17
... Spline part, 18, 18' ... Friction multi-plate,
D...Pinion.

Claims (1)

[Claims] 1 Side housing 6 of vane type pneumatic motor
an internal gear 11 that meshes with an internal gear pinion 11' carved in the extended end of the rotor shaft 3 of the pneumatic motor; A pinion shaft 14 extending from the gear 11 with substantially the same outer diameter and meshingly supporting a ring gear pinion D is inserted through a pinion shaft ball bearing ₇₂ slidably inserted in the axial direction of the pinion shaft 14. and a supporting cylindrical body 13, extending from the cylindrical body 13 with substantially the same outer diameter, and
A spline part 16 in which a multi-friction plate 18 is embedded to engage with a multi-friction plate 18' embedded in a spline part 17 formed directly on the pinion shaft 14, are formed from the same cylindrical member, and a pair of For an internal combustion engine equipped with a torque limiter, which is built-in via a ball bearing ₇₁ for a cylindrical member, and has a leaf spring interposed between the ball bearing ₇₂ for the pinion shaft and a step on the inner periphery of the cylindrical body 13. Starting device.