JP4484045B2 - Assembly method for one-way clutch - Google Patents

Description

The present invention relates to a method of assembling the one-way clutch using the Misosuri movement Organization give Misosuri movement relative to the axis to the original simple configuration.

  In order to reduce vibration and noise in a belt transmission mechanism that transmits the rotation of an automobile engine to an auxiliary machine such as an alternator, a one-way clutch is incorporated in a pulley on the driven side, for example, a pulley on the alternator side, and the pulley is driven by a belt. In the rotation direction, torque is transmitted to the pulley shaft, and in the opposite direction, a technique is known in which the pulley is idled with respect to the pulley shaft (see, for example, Patent Document 1), and is applied to an alternator. In some cases, it is called a clutch pulley alternator (CPA) or the like.

  An example thereof is shown in FIG. 3A as an axial parallel sectional view, and in FIG. 3B as a partial axis orthogonal sectional view. In this example, a pulley (outer member) 32 is arranged outside a cylindrical inner member 31 fixed to a pulley shaft, and both end portions of the pulley 32 can be rotated to the inner member 31 by ball bearings 33 and bearings 34. I support it. A roller type one-way clutch 35 is provided between the ball bearing 33 and the bearing 34.

  The one-way clutch 35 includes the outer peripheral surface of the inner member 31 and the inner peripheral surface of the pulley 32 as components, and holds a plurality of other rollers 351 and the rollers 351 at predetermined intervals in the circumferential direction. And a spring 353 that is attached to the retainer 352 and biases each roller 351 in the meshing direction of the one-way clutch 35, and is inserted into the annular space G between the inner member 31 and the pulley 32. ing. On the outer peripheral surface of the inner member 31, as many cam surfaces 31a as the number of rollers 351 are formed, while the inner peripheral surface 32a of the pulley 32 is an inner cylindrical surface.

  With the above configuration, when the pulley 32 rotates in the direction of the arrow L in the figure, the revolving direction of the roller 351 and the urging force of the spring 353 due to the rotation are the same direction, and each roller 351 has a cam surface 31a. And the inner member 31, the roller 351, and the pulley 32 are engaged with each other, and the rotation of the pulley 32 is transmitted to the inner member 31. .

  On the other hand, when the pulley 32 rotates in the direction indicated by the arrow F, the roller 351 resists the urging force of the spring 33 due to the revolution of the roller 351 due to the rotation, and the roller 351 causes the cam surface 31 a and the inner peripheral surface 32 a of the pulley 32 to rotate. The inner member 31, the roller 351, and the pulley 32 do not mesh with each other, and the pulley 32 idles, thereby suppressing the vibration in the belt traveling direction from being transmitted to the pulley shaft. The

  By the way, in the pulley with a one-way clutch configured as described above, a plurality of rollers 351 of the one-way clutch are held because the ball bearing 33 is incorporated between the inner member 31 and the pulley 32 which is the outer member. The container 352 and the spring 353 need to be inserted into the annular space G between the inner member 3 and the pulley 32 after the ball bearing 33 is incorporated between the inner member 31 and the pulley 32. Specifically, an annular space between the inner member 31 and the pulley 32 is formed as an assembly 350 having an axial parallel cross-sectional view in FIG. 4A and a partial orthogonal cross-sectional view in FIG. Insert into G.

  However, it is not possible to insert the assembly 350 into the annular space G between the inner member 31 and the pulley 32 simply by pushing the assembly 350 in the axial direction. . As apparent from a comparison between FIG. 4B and FIG. 3B, this is because the assembly 350 including the roller 351, the retainer 352, and the spring 353 has a spring 353 as shown in FIG. 4B. Thus, each roller 351 is positioned at the extreme end of the pocket of the cage 352, whereas in the state where it is incorporated in the annular space G between the inner peripheral surface of the inner member 31 and the pulley 32, FIG. As shown in FIG. 4B, due to the presence of the cam surface 31a, each roller 351 is located slightly in the center from the end of the pocket, and due to the change in the position of each roller 351, FIG. This is because the assembly 350 in the state cannot simply be pushed into the annular space G in the axial direction.

  In view of such a situation, the present inventor, as a result of earnest research, inclines the assembly 350 slightly or inserts it into the annular space G while changing its inclination in a razor motion, that is, the assembly. By giving a minute razor motion to the pressing member for pushing 350 into the annular space G, each roller 351 is appropriately moved to the wide space side against the biasing force of the spring 353 and inserted with a relatively small force. I found out that it was possible.

As a mechanism for performing a slashing movement, that is, a precession movement or a nutation movement, for example, a mechanism using a cam or an inclined axis between two horizontal axes, and both ends of the inclined axis are provided. The cones are brought into contact with each other at the conical surfaces with respect to the horizontal axis, and the rotation is applied from one horizontal axis to the inclined axis by frictional conduction. A mechanism that imparts a sliding motion is known (see, for example, Patent Document 2).
Japanese Patent Laid-Open No. 11-63025 JP 58-24647 A

  However, the conventional slashing movement mechanism has a complicated structure and not only a relatively large apparatus configuration, but also generates a small slashing movement (small swing angle) necessary for the above-described one-way clutch assembly process. It is difficult to make it.

The present invention has been made in view of such circumstances, a simple and compact configuration together with Misosuri movement mechanism capable of performing a fine Misosuri movement of assembling the one-way clutch easily An object of the present invention is to provide a method for assembling a one-way clutch that can be performed.

In the method of assembling the one-way clutch of the present invention, a plurality of rollers are held at predetermined intervals in the circumferential direction by a cage in an annular space formed between an inner member and an outer member arranged radially inside and outside. These rollers are urged in a constant circumferential direction by urging means provided on the cage, and the outer peripheral surface of the inner member and the inner peripheral surface of the outer member Is a method of assembling a one-way clutch in which a cam surface is formed so that the annular space becomes a wedge-shaped space narrowing in one circumferential direction at a plurality of circumferential positions corresponding to the rollers. In the state where the inner member and the outer member are arranged so that an annular space is formed between them, an assembly in which each roller and urging means are incorporated in a cage is inserted into the annular space at one end thereof. Insert from the side Upon applying seen, while Misosuri movement axis viewed Sosuri motion mechanism, as well as pressing the other end of the assembly by its axis, as a Misosuri motion mechanism, a shaft rotation is given from the outside, its The inner ring includes two ball bearings in which the inner ring is rotatably supported and the outer ring is fixed to the housing side, and at least one of the ball bearings is provided between the inner ring and the outer ring. Further, each of the plurality of balls arranged at a predetermined interval in the circumferential direction is characterized by using a structure in which the sizes are gradually different in the circumferential direction (claim 1 ).

Here, in the one-way clutch assembly method of the present invention, it is preferable that the ball bearing in the razor movement mechanism is an angular ball bearing.

According to the present invention, a compact razor movement mechanism capable of minute razor movement is used, and an assembly in which each roller and urging means are incorporated in a cage is connected to an annular space between an inner member and an outer member. Further, it can be inserted under a relatively small pressing force.

That is, in the razor movement mechanism used in the method of the present invention, a minute razor movement is possible as follows. To describe the operation, the shaft is rotatably supported by two bearings, and at least one of the bearings includes a plurality of balls interposed between an outer ring fixed to the housing and an inner ring to which the shaft is fixed. When the size is gradually changed in the circumferential direction and the inner ring is pressed in the axial direction against the outer ring, the inner ring is inclined with respect to the outer ring. When the shaft is rotated in this state, and thus the inner ring is rotated, the inner ring and the shaft move in a razor motion with respect to the outer ring. Therefore, the required movement can be performed by changing the size of the ball in the ball bearing that supports the shaft without using a separate mechanism for razor movement, and it rotates under a very simple and compact structure. Movement can be converted to razor movement. In addition, the inclination angle of this razor movement can be arbitrarily changed in a minute angle region depending on the difference in the ball size and the way of arrangement. For example, using a ball bearing having a pitch circle diameter of the ball of about several tens mm, A minute razor movement can be generated such that the inner ring is inclined by about several tens of μm on the pitch circle diameter.

  As is clear from the above description, for ball bearings that gradually vary the ball size in the circumferential direction, the inner ring, the ball, and the outer ring must be in close contact with each other in the axial direction. Need to be added. Accordingly, the ball bearing used in the present invention may be a deep groove ball bearing with a large gap, but for this application, it is preferable to use an angular ball bearing as in the invention according to claim 2.

Using small Misosuri movement can par Sosuri motion mechanism such as the following, while providing a small Misosuri motion axis, an inner member 31 of the assembly 350 illustrated in FIG. 4 by the shaft pulley 32 For example, the assembly 350 can be inserted into the annular space G under a relatively small pressing force.

According to the slashing motion mechanism used in the method of the present invention , the rotation applied to the shaft is misaligned only by gradually varying the ball size of at least one of the two ball bearings supporting the shaft in the circumferential direction. It can be converted into a sliding motion, and the slashing motion mechanism is as simple and compact as possible.

According to the one-way clutch assembling method of the present invention using such a razor movement mechanism, the assembly of the roller, the cage and the biasing means is minutely placed in the annular space between the inner member and the outer member. Since it is pushed in by a shaft that performs a slashing motion, the assembly can be inserted into the annular space with a relatively small pressing force, and there is no problem such as breakage of the cage or generation of indentation, and high yield can be achieved. A one-way clutch can be assembled.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view of a test stand used in the embodiment of the present invention.

  A plurality of, for example, four guide columns 2 are fixed on the base 1 along the vertical direction, and the elevating member 4 is slidably guided by the guide columns 2 via the slide bearings 3. Yes. A compression coil spring 5 is provided between the base 1 and the elevating member 4 along each guide column 2, and the elevating member 4 in the normal state causes the elevating member 4 to guide the guide column 2 as shown in the figure. It is comprised so that it may be located in the upper-end part vicinity.

  A shaft 6 along the vertical direction is rotatably supported by the elevating member 4 via an angular ball bearing 7. A cup-shaped pressing member 9 is disposed on the upper end side of the shaft 6 via an angular ball bearing 8 so as to be relatively rotatable. Further, a columnar guide portion 6a positioned on the axis and a cylindrical pressing portion 6b around the columnar guide portion 6b are integrally formed at the lower end portion of the shaft 6. The guide portion 6a has a diameter that fits into the inner peripheral surface of the inner member 31 of the workpiece W, which will be described later, with a slight gap, and the pressing portion 6b has a diameter and thickness that presses an end surface portion of the assembly 350, which will be described later. is doing.

  Among the above angular ball bearings, the lower angular ball bearing 7 is fitted and fixed to an outer ring support member 10 whose outer ring 7 a is screwed to the elevating member 4, and the inner ring 7 b of the angular ball bearing 7. Is press-fitted and fixed to the shaft 6. The upper angular ball bearing 8 has an outer ring 8 a fitted and fixed to the pressing member 9, and an inner ring 8 b is press-fitted and fixed to the shaft 6. Further, a rotary arm 11 is attached to the shaft 6 between the upper and lower angular ball bearings 7 and 8 along the horizontal direction, and the shaft 6 rotates by rotating the rotary arm 11 around the shaft 6. Is configured to do.

  At least one of the upper and lower angular ball bearings 7, 8 described above, for example, the lower angular ball bearing 7, for example, the size of the ball 7c is gradually different in the circumferential direction. The example is typically shown in FIGS. 2 (A) and 2 (B). The numerical values shown in FIGS. 2A and 2B indicate the relative diameter differences of the balls 7c. That is, 0 indicates a standard diameter used in the angular ball bearing 7, and other numerical values indicate a diameter difference with respect to the standard ball in units of μm. In FIG. 2A, using 12 balls, the balls facing each other are set to 0 (standard diameter), and the ball size is increased or decreased by 5 μm from the two balls toward both sides. The maximum diameter difference is ± 15 μm. In FIG. 2B, 12 balls are also used, one ball is set to 0 (standard diameter), the ball size is increased by 5 μm toward one side, and the ball size is increased by 5 μm on the other side. And a difference in diameter of −30 μm to +25 μm is provided.

  For example, the lower angular ball bearing 7 has the ball arrangement shown in FIG. 2A, and the outer ring 7a is fixed horizontally, and the outer ring 7a, the inner ring 7b and the balls 7c are pressed in the vertical direction so that they are in close contact with each other. For example, the inner ring 7b is tilted in a state where the +15 μm ball side is high and the −15 μm ball side is low, and accordingly, the shaft 6 to which the inner ring 7b is fitted and fixed is tilted. When the rotary arm 11 is operated in this state to rotate the shaft 6, the position of each ball 7c changes in the circumferential direction due to the revolution of each ball 7c of the lower angular ball bearing 7, so that the inner ring 7b and As a result of the inclination direction of the shaft 6 gradually changing according to the rotation phase, the shaft 6 makes a shave movement.

  A work support 12 is arranged on the upper surface of the base 1 coaxially with the shaft 6, and an assembly 350 of the one-way clutch illustrated in FIG. 3 is placed on the work support 12. The workpiece W in a state before assembly, that is, the workpiece W in which the inner member 31 and the pulley 32 are integrated via the ball bearing 33 is placed. Then, with the assembly 350 illustrated in FIG. 4 placed on the upper end portion of the annular space G between the inner member 31 and the pulley 32, while applying a vertically downward force F to the shaft 6 via the pressing member 10, The shaft 6 is rotated via the rotating arm 11. As a result, the shaft 6 moves in a slashing motion while the guide portion 6a enters the inner periphery of the inner member 31 and simultaneously the pressing portion 6b presses the end surface of the assembly 350 while slashing. As a result, the roller 351 in the assembly 350 appropriately moves to the wide space side against the urging force of the spring 353 and enters the annular space G of the workpiece W with a small pressing force F, so that it can be easily and reproduced. The assembly 350 can be assembled between the inner member 31 and the pulley 32 with good performance.

  The rotating arm 11 may be operated manually, or may be rotationally driven by a motor using an appropriate transmission mechanism. Moreover, it can replace with the rotation arm 11 and can arrange | position a pulley etc. and can also transmit rotation of a motor.

  Further, in the above embodiment, the example in which the size of the ball 7c of the lower angular ball bearing 7 among the upper and lower angular ball bearings 7, 8 is gradually different in the circumferential direction has been shown. The ball size of the bearing 8 may be gradually different in the circumferential direction, and the ball sizes of both the upper and lower angular ball bearings 7 and 8 may be gradually different in the circumferential direction. However, when the upper and lower ball sizes are different, it is necessary to prevent the ball sizes in the upper and lower bearings 7 and 8 from being opposite to each other. Most preferably, the maximum diameter ball position is the upper and lower bearings. 7 and 8 may be incorporated so as to be in the same phase.

In addition to the one-way clutch incorporated in the method of the present invention, in addition to the one incorporated in the pulley described above, after combining the inner member and the outer member, in the annular space formed between them, a roller, a cage and Mention may be made of any structure which requires the insertion of a combination of biasing means.

It is sectional drawing of the test stand used in embodiment of this invention. (A), (B) is a schematic diagram which shows the example of the size of each ball | bowl 7c of the angular ball bearing 7 of the lower side of embodiment of FIG. It is a figure which shows the structural example of the pulley incorporating a one-way clutch, (A) is an axial parallel sectional view, (B) is a partial expanded axis orthogonal sectional view. 4A and 4B are diagrams showing a configuration example of an assembly of a one-way clutch assembled between an inner member 31 and a pulley 32 in FIG. 3, wherein FIG. 3A is an axial parallel cross-sectional view, and FIG. .

DESCRIPTION OF SYMBOLS 1 Base 2 Guide pillar 3 Slide bearing 4 Lifting member 5 Compression coil spring 6 Shaft 6a Guide part 6b Press part 7 Angular contact ball bearing (lower side)
7a Outer ring 7b Inner ring 7c Ball 8 Angular contact ball bearing (upper side)
9 Pressing member 10 Outer ring support member 11 Rotating arm W Work 31 Inner member 32 Pulley (outer member)
33 Ball bearing 350 Assembly 351 Roller 352 Cage 353 Spring

Claims (2)

A plurality of rollers are arranged in a circular space formed between the inner member and the outer member arranged on the inner side and the outer side in the radial direction in a state where the rollers are held at a predetermined interval in the circumferential direction by the cage, and these Each roller is urged in a constant circumferential direction by urging means provided on the cage, and the outer peripheral surface of the inner member and the inner peripheral surface of the outer member are circumferentially corresponding to the rollers. A method of assembling a one-way clutch in which a cam surface is formed such that the annular space becomes a wedge-shaped space that narrows toward one direction in the circumferential direction at a plurality of locations,
In a state where the inner member and the outer member are arranged so that an annular space is formed between them, an assembly in which each roller and urging means are incorporated in a cage is inserted into the annular space from one end thereof. Upon assembled and inserted, while Misosuri movement axis viewed Sosuri motion mechanism, as well as pressing the other end of the assembly by the shaft,
As the razor movement mechanism, there are provided a shaft to which rotation is given from the outside, two ball bearings in which the inner ring is fixed to the shaft and the outer ring is fixed to the housing side to rotatably support the shaft. For at least one of the ball bearings, a structure in which the sizes of the plurality of balls arranged at predetermined intervals in the circumferential direction between the inner ring and the outer ring are gradually different in the circumferential direction is used. A method for assembling a one-way clutch. 2. The method for assembling a one-way clutch according to claim 1, wherein the ball bearing in the razor movement mechanism is an angular ball bearing.

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