JPS6148012B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a one-way roller clutch, and more particularly, to a one-way roller clutch that prevents displacement of the end of a compression spring that comes into contact with the side wall surface of a storage chamber and balances the amount of deflection of the compression spring. This invention relates to improving the side wall surface of a spring storage chamber.

Generally, one-way roller clutches are sometimes used in starters for starting internal combustion engines.

A conventional one-way roller clutch of this type, as shown in Japanese Utility Model Application Publication No. 49-146325, has a notch formed in the ring shear insertion portion of the crankshaft, and a roller is disposed in this notch. Some devices bias the rollers using a spring installed in a spring insertion portion provided in the crankshaft. However, in the device disclosed in Japanese Utility Model Application No. 49-146325, the inner peripheral surface of the ring gear itself is used as the guide surface of the roller, so depending on the position of the roller, the center of action of the spring coincides with the center of the roller. Without,
The problem was that it lacked operational safety.

On the other hand, instead of using the inner circumferential surface of the ring gear itself as a roller guide surface, a roller guide surface is specially formed on the inner circumferential surface of the ring gear, and a spring is placed on the ring gear side, as shown in FIG. There is a directional roller clutch. This is achieved by fitting an inner ring 1 and an outer ring 2 (only a portion of which is shown) into each other so as to be able to rotate freely, and forming an appropriate number of locations on the inner circumferential surface of the outer ring.
Only the parts are illustrated. same as below. ) has a ceiling wall 3A whose height changes in the circumferential direction, and a roller storage chamber 3 in which a wedge angle ε is formed between the ceiling wall 3A and the outer peripheral surface 1A of the inner ring 1; A pressure spring storage chamber 4 is formed in series with the enlarged side end of the roller storage chamber 3, and a roller 5 having a diameter D equal to the height H at a predetermined position of the storage chamber 3 is placed in the roller storage chamber 3 over a certain length. The press spring 6 is stored in the press spring storage chamber 4 so that it can freely move in the circumferential direction within the range of 100 degrees, and the press spring 6 is stored in the press spring storage chamber 4 so that one end thereof is in contact with the outer peripheral surface of the roller 5 and the other end is in contact with the side wall surface of the storage chamber 4. The pressure spring 6 is configured to bias the roller 5 so as to push it between the ceiling wall 3A and the outer peripheral surface of the inner ring 1 at a predetermined height H position of the roller storage chamber 3. .

In the one-way roller clutch having the above configuration, when the outer ring 2 moves relative to the inner ring 1 in the direction of the arrow (the direction in which the wedge angle ε increases), the roller 5 touches the ceiling wall 3A of the storage chamber 3 and the inner ring 1. The inner ring 1 and the outer ring 2 are firmly pushed in between the outer peripheral surface 1A and the inner ring 1 and the outer ring 2.
are connected to each other, and the clutch is turned ON.

Next, when the outer ring 2 rotates relative to the inner ring 1 in the opposite direction of the arrow (the direction in which the wedge angle ε decreases), the balls 5 are pushed into the gap between the ceiling wall 3A of the storage chamber 3 and the outer peripheral surface 1A of the inner ring 1. The clutch enters the escape state, releases the connection between the inner ring 1 and outer ring 2, and turns the clutch OFF.

By the way, in such a one-way roller clutch, in order to improve the initial pushing performance of the roller 5, as shown in FIG. The side wall surface 4A of the compression spring storage chamber is formed to be approximately perpendicular to the center line 7 of the wedge angle ε so as to coincide as much as possible with the wedge angle ε.

However, with the configuration of the push spring storage chamber 4 shown in FIG. 1, the push spring 6 is likely to be displaced at the contact end on the side wall surface 4A of the storage chamber, and due to this displacement, it is also likely to come off the roller 5. It has the disadvantage of becoming.

In order to overcome this drawback, a one-way roller clutch as shown in FIG. 2 has conventionally been used. This is done by forming the side wall surface 4A of the push spring storage chamber 4 at an acute angle with respect to the biasing direction of the push spring 6 to prevent displacement from occurring at the abutting end of the side wall surface 4A of the push spring 6. It was designed to do so.

However, with the configuration of the compression spring storage chamber 4 shown in FIG. 2, the amount of deflection is different between the inner and outer portions of the compression spring 6 relative to the storage chamber 4, that is, the amount of deflection is greater in the inner portion and less in the outer portion. In some cases, the biasing force of the pressure spring 6 deviates outward with respect to the center line 7 of the wedge angle ε, and the surface pressure between the roller 5 and the inner portion of the pressure spring 6 becomes very small. This has the drawback that the push-in performance deteriorates, and as a result, the engagement operation between the inner and outer rings by the rollers 5 becomes unstable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a one-way roller clutch in which displacement of the compression spring can be prevented and the amount of deflection of the compression spring is balanced.

In the present invention, the side wall surface of the compression spring storage chamber has a double structure of an inner bearing surface and an outer bearing surface, the inner bearing surface is inclined with respect to the axis of the compression spring to prevent displacement of the compression spring, and the outer bearing surface is inclined with respect to the inner receiving surface to correct the imbalance in the amount of deflection of the pressing spring caused by the inclination of the inner receiving surface.

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

FIG. 3 shows an embodiment in which the present invention is applied to a pinion clutch for a starter for starting an internal combustion engine. In FIG. A clutch sleeve 12 is integrally connected to each of the outer ring 2, and a washer 13 for closing off a storage chamber formed in the outer ring 2 is connected to a cover 15 via a sealing member 14 on the other end surface of the outer ring 2. is supported and joined.

FIG. 4 shows the main parts of the one-way roller clutch, and a roller storage portion 3 formed on a part of the inner circumferential surface of an outer ring 2 rotatably fitted to an inner ring 1 has a roller 5 therein. A press spring 6 is stored in a press spring storage chamber 4 connected to the storage chamber 3 so as to be freely movable within a certain length range. The ceiling wall 3A forming a wedge angle of the roller storage chamber 3 and the outer peripheral surface 1A of the inner ring 1
It can be pushed into a gap at a predetermined height between the two.

Accordingly, following the movement of the outer ring 2 relative to the inner ring 1, the roller 5 is displaced within the roller storage chamber 3 under the bias of the pressure spring 6, and the inner ring 1 and the ceiling wall 3A of the storage chamber 3 are displaced.
The process of connecting and releasing the inner ring 1 and outer ring 2 by firmly pressing the inner ring 1 and the outer circumferential surface 1A of the inner ring 1 and then releasing the inner ring 1 and the outer circumferential surface 1A of the inner ring 1 is substantially the same as in the conventional example.

In this one-way roller clutch, the side wall surface 4A of the compression spring storage chamber 4 has an outer receiving surface 8A that is located outside the storage chamber 4 and receives an outer portion 6A at one end of the compression spring 6, and an outer receiving surface 8A that is located on the outside of the storage chamber 4 and receives an outer portion 6A at one end of the compression spring 6; The outer receiving surface 8A and the inner receiving surface 8B are located at a distance from the roller 5. The outer portion 6A and the inner portion 6B at one end of the compression spring 6 are in line contact with the outer receiving surface 8A and the inner receiving surface 8B, respectively.

The inner receiving surface 8B is an extension surface B-B of that surface.
is a plane that intersects at an acute angle β of 75 degrees or less with the extended plane of the ceiling wall 4B of the compression spring housing chamber 6, which defines the axial direction of the compression spring 6.

The outer receiving surface 8A is a distance from the contact point of the outer portion of the other end of the push spring 6 that is in contact with the roller 5 pushed into the roller storage chamber 3 at a predetermined height position.
The extension surface A-A is appropriately inclined to the extension surface B-B of the inner receiving surface 8B so that LA is approximately equal to the distance LB to the contact point of the inner part of the compression spring 6 on the inner receiving surface 8B. They are formed as surfaces that intersect with corners. Therefore, this outer receiving surface 8
Angle α between the extension surface A-A of A and the ceiling wall 4B
is an appropriate angle larger than the acute angle β of 75 degrees or less.

In the inner portion 6B of one end of the push spring 6 that is in contact with the inner receiving surface 8B having the above structure, the receiving surface 8B is inclined with respect to the axis of the push spring 6. The contact point between the portion 6B and the inner receiving surface 8B is slightly shifted outward from the average diameter position of the push spring 6, and the reaction force R received from the receiving surface 8B is not parallel to the axis, as shown in FIG. , it faces outward by an inclination angle θ. Therefore, the inner receiving surface 8B always pushes the push spring 6 outward with this reaction force R and prevents the push spring 6 from being freely displaced. Incidentally, the inclination angle (corresponding to the acute angle β) of the inner receiving surface 8B that generates this reaction force R with respect to the axis of the compression spring 6 depends on the pressing force of the compression spring 6, the mass, the vibration of the entire clutch, etc. Appropriately selected.

In this way, even when the press spring 6 is prevented from free displacement by the inner receiving surface 8B, the outer receiving surface 8A and the inner receiving surface 8B
Since the distances LA and LB are approximately equal, the amount of deflection of the compression spring 6 is
The inside and outside are balanced, so the push spring 6 always presses the roll 5 evenly, maintains a constant pushability, and creates a stable connection operating state.

As described above, according to the present invention, it is possible to prevent the press spring from being freely displaced with respect to the side wall surface of the storage chamber, and it is also possible to maintain a constant amount of deflection of the press spring as a whole.

[Brief explanation of the drawing]

1 and 2 are enlarged partial sectional views showing a conventional example, FIG. 3 is a partially cutaway side view showing an embodiment of the present invention, and FIG. 4 is an enlarged portion taken along the line shown in FIG. 3. FIG. 1...Inner ring, 2...Outer ring, 3...Roller storage chamber, 3A...Ceiling wall, 4...Press spring storage chamber, 4A
...Side wall surface, 4B...Ceiling wall, 5...Roller, 6
...Press spring, 6A...Outer part, 6B...Inner part, 8A...Outer receiving surface, 8B...Inner receiving surface, β...
...Acute angle, LA, LB...Distance between the pressure spring contact and the receiving surface.

Claims (1)

[Claims] 1. An inner ring and an outer ring are fitted together so that they can rotate freely, and a part of the inner circumferential surface of the outer ring has a ceiling wall whose height changes in the circumferential direction, and the ceiling wall and the outer circumferential surface of the inner ring are connected to each other. A roller storage chamber with a wedge angle formed therein and a pressure spring storage chamber connected to the enlarged end of this storage chamber are formed respectively, and the height of the roller storage chamber is equal to the height of the storage chamber at a predetermined position. A roller having a diameter is housed so as to be freely movable in the circumferential direction within a certain length range, and a press spring is placed in a press spring storage chamber so that one end thereof is in contact with the outer peripheral surface of the roller and the other end is in contact with the side wall surface of the storage chamber. The one-way roller clutch is configured such that the pressure spring is used to bias the roller to be pushed between the ceiling wall and the outer peripheral surface of the inner ring at a predetermined height position of the roller storage chamber. The side wall surface of the chamber is defined by an inner receiving surface that is located on the inside in the radial direction of the outer ring and receives the inner part of the pressure spring end, and an outer part that is located on the outside in the radial direction of the outer ring and receives the inner part of the pressure spring end. the inner receiving surface is formed to be a surface that intersects the axis of the compression spring at an acute angle; The distance to the contact point of the outer part of the other end of the compression spring that is in contact with the roller pushed into the height position is
A one-way roller clutch characterized in that the distance is approximately equal to the distance to the contact point of the inner portion of the compression spring on the inner receiving surface.