JPS6120308Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine starting device using a motor, and more particularly to a pinion shaft support device.

This invention was devised under the following circumstances. As is well known, in the air starting system of an engine, starting air is sent to each cylinder through the starting valve in accordance with the ignition order by a distribution valve at the end of the camshaft to rotate the engine. As cylinders are becoming smaller, lighter and faster, it has become structurally difficult to install the starter valve that was conventionally provided on each cylinder. Therefore, it may be possible to replace it with an electric starter used in small engines, but
Electric starters required batteries, charging voltage regulators, etc., and were not suitable for large engines.

Therefore, it was considered to apply a vane type air motor to an engine starting device, and the present invention was devised during the development of this vane type air starting device.

First, a vane type air starter to which the present invention is applied will be explained. The outline of this vane type air starter device is comprised of a pneumatic motor A, a reduction mechanism B, a trilimiter C, and a pinion D, as shown in FIG. These will be explained in detail below.

First, the pneumatic motor A is a vane-type air motor, and is housed in a cylinder 1 with a rotor 2 eccentric to the cylinder 1, and the rotor 2 is connected to both side housings by its rotor shafts 3 and 4. 5 and 6 via ball bearings 7 and 7 so as to be rotatable. A plurality of blades 8 are provided on the rotor 2 so as to be slidable radially with respect to the center of the rotor 2, and the outer ends of the blades 8 are always housed in the cylinder 1 during driving. The cylinder 1 has an inlet passage groove 9 on the inlet side and an outlet passage groove 1 on the outlet side.
A plurality of 0's are provided for each.

Next is the speed reduction mechanism B, which is formed by carving the end of the rotor shaft 4 into a pinion 11 for an internal gear, 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 the remaining part accommodates a ball bearing ₇₂ that supports a pinion shaft 14 in which a reciprocating pinion D (described later) is meshed. As a result, the ring gear 15 side of the engine becomes a spring portion 16 in which a multi-friction plate 18 for the trilimiter C is installed.

Next, regarding the trigger limiter C, the starting device that rotates the ring gear 15 of this type of engine is caused by the pinion D caused by the shocking starting torque of the starting motor and the inertia rotation when starting operations are repeated. It is necessary to absorb the impact force caused by the engagement and disengagement with the ring gear 15 of the engine, and in this embodiment, the friction multi-plate 18 embedded in the spring portion 16 of the cylindrical body 13 extending to the internal gear 11 is used. The spring of the multi-friction plate 18' installed in the spring portion 17 provided on the pinion shaft 14 blocks or converts it into heat, absorbing the starting torque and impact force. Also, pinion D is ring gear 1 of the engine.
5, a reaction force is generated on the pinion shaft 14 that meshes with and supports the pinion D, but in order to cope with this, the pinion shaft 14 comes into contact with the outer race 7 ₂ ' of the ball bearing 7 ₂ supported at the end of the pinion shaft 14. A donut-shaped spring bearing 19 is housed in the cylindrical body 13, and two donut-shaped disc springs 21 are installed in parallel to the tube 20, and the pinion shaft 1
The reaction force of 4 is transferred to ball bearing 7 ₂ → spring receiver 19 →
It is absorbed by the disk spring → the cylindrical body 13. 22 is a spring for pressing the multi-friction plates 18, 18';
They are fitted into a plurality of protrusions 24 protruding from the disc 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, and the force of the trilimiter C is adjusted.
The transmission torque is adjusted. In addition, the nut 2
5 is fixed with a holosett bolt in a direction perpendicular to the axial direction.

Next, regarding the pinion D, a threaded spring 26 is carved into the pinion shaft 14, and the threaded spring 26 and the pinion D mesh with each other. Because of this threaded spring 26, when the pneumatic motor A begins to rotate, the pinion shaft 14 is decelerated and rotates at high speed (approximately 200 rpm, although it fluctuates). As a result, the pinion D moves to the ring gear 15 side, engages with the ring gear 15, and after a slight engagement, the pinion D moves more and more to the ring gear 15, and finally engages with the ring gear 15 and rotates the ring gear 15. Begins to move. Also, after the engine starts, the rotation of the ring gear 15 is 400 to 500 rpm.
Therefore, the pinion D itself has a rotation speed of 5,000 to 6,000 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 explain in more detail the transmission of power from the pneumatic motor A, the power from the pinion shaft 14 is transmitted to the pinion stopper 27, and the pinion stopper 27 and pinion D are integrally connected to the ring gear 15. It is designed to communicate. 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 spring 26 which functions to return the pinion D. Further, the pinion stopper 27 is connected to the pinion shaft 14 through a screw in the opposite direction of rotation of the pinion shaft 14.
Since it is fixed to , the pinion stopper 27 will not come off.

In the vane type air starter of this embodiment having the above-described configuration, air with a higher pressure than the starting air tank (not shown) is supplied to the inflow passage groove 9 of the pneumatic motor A, and the rotor shafts 3 and 4 are driven at high speed. Rotate. The rotation is decelerated by the meshing of the pinion 11 for the internal gear 11 carved on one end of the rotating rotor shaft 4 with the internal gear 11, and the pinion shaft 14 rotates via the trilimiter C. pinion shaft 1
4 threaded spring 26 coupled pinion D
starts to fit into the ring gear 15 of the engine and start to rotate and start the engine. After the engine is started, the pinion D returns to its original position and disengages from the ring gear 15, and the supply of high-pressure air is also stopped, completing the operation of the air starter.

Now, the present invention relates to a support device for the pinion shaft 14, but when the pinion D engages and disengages from the ring gear 15 of the engine, the shocking starting torque of the starting motor is affected by the impact force caused by starting the engine. The pinion shaft 14 is repeatedly rotated at high speed and simultaneously reciprocated in the axial direction. Therefore, the support device for the pinion shaft 14 must withstand severe motion.

Therefore, in the present invention, a pinion stopper 27 is threaded in the direction opposite to the rotation of the pinion D on one shaft end supported by the casing 12, as described above, so that the pinion stopper 27 is tightened. The pinion stopper 27 and the pinion shaft 14 are firmly connected by screwing together freely. Therefore, this shaft end of the pinion shaft 14 is supported by the casing 12 through the metal 35 through the pinion stopper 27, and is resistant to rotation and bending.

Further, plate-shaped caps 36 are attached to both outer end surfaces of the pinion shaft 14 and the pinion stopper 27, and lubricating oil such as grease is put into the caps 36, so that the oil is absorbed by the frictional heat between the pinion stopper 27 and the metal 35. It has been dissolved and introduced to perform its functions smoothly.

[Effect of idea]

Since the ring gear of the engine is fixed to the shoulder of the flywheel of the engine, the flywheel exists on the side of the ring gear, and the casing 12 overhangs and cannot be suspended, making it difficult to support the pinion shaft. . On the other hand, since the pinion shaft 14 instantaneously rotates at high speed, the PV value of the bearing is as high as 100 to 200, and the pinion shaft 14 is subjected to an impact force in the axial direction. Nevertheless, it is difficult to install lubrication means. In order to overcome such difficulties in support and lubrication, the present invention adopts the structure described in the claims of the utility model registration.

In other words, the pinion stopper is supported by the casing, which has to be made thinner at the bottom due to the presence of the flywheel. Although it absorbs shaft shock, there is severe axial sliding)
In addition, the pinion shaft and pinion stopper are screwed together in the opposite direction to the rotation of the pinion, so even if the pinion is operated frequently, the pinion stopper will not move. Since it does not come out and the end face of the casing in the pinion axis direction does not bulge (due to a lock nut, etc.), it does not come into contact with the flywheel, making it compact. Moreover, the metal, which protrudes in a cantilevered manner and is supported by the thin-walled casing, is lubricated by grease stored in a dish-shaped cap that covers both outer end surfaces of the pinion shaft and pinion stopper. , Not only does it provide sufficient lubrication for the above-mentioned harsh sliding of the pinion stopper, but it also has a disc-shaped cap, unlike a normal grease cap, so it can be used to protect the flywheel to which the ring gear is attached. Never come into contact with.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of the entire device. 12...Casing, 14...Pinion shaft, 1
5...Ring gear, 27...Pinion stopper, 36...Cap, D...Pinion.

Claims (1)

[Scope of utility model registration request] Power from the motor drives a pinion shaft 14 that moves slightly in the axial direction through a torque limiter made of multiple friction plates, and a pinion D that engages and disengages from the ring gear 15 of the engine is mounted on the pinion shaft 14. In the screwed engine starting device, a pinion stopper 27, which the pinion D comes into contact with, is screwed and fixed to one end of the pinion 14 in a direction opposite to the rotation of the pinion D. ,
It is attached via a metal 35 to the tip of the lower thin-walled casing 12 which is cantilevered over the ring gear 15 of the engine, and the casing 12 also controls the rotation and rotation of the pinion stopper 27. A lubricant such as grease is sealed in a dish-shaped cap 36 that supports slight axial movement and covers both outer end surfaces of the pinion shaft 14 and the pinion stopper 27, and the metal 35 is lubricated with the lubricant. A pinion shaft support device for engine starting, characterized by: