JPH06193655A - Manufacture of overrunning clutch - Google Patents

Abstract

PURPOSE:To secure the manufacture of an overrunning clutch whose narrow part in the wedgy space is easily alterable into the required dimensions without requiring any alteration in the engaged part of a driver, and which is inexpensive to manufacture. CONSTITUTION:A diameter, where an outer diametral part of a transmitter 12, to be inserted into the inner circumferential part of a large diametral part of a driver 1, is made larger to some extent in advance, is altered into a small diameter, whereby a narrow part in the wedgy space in a gap with a taper notch 1a of the driver 1 is set to the specified size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an overrunning clutch used in, for example, a starter of an engine, and more particularly to an improvement of a method of manufacturing an overrunning clutch capable of limiting an excessive transmission torque.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show, for example, Japanese Utility Model Publication No. 59-2610.
The conventional overrunning clutch disclosed in Japanese Patent No. 7 is provided with a protection means. In the figure, reference numeral 1 denotes a cylindrical driving body connected to a rotary shaft of a starting motor (not shown) by an inner diameter portion, and tapered notch portions 1a are formed on the inner circumference on the large diameter side at equal intervals in the circumferential direction. Has been done. Reference numeral 2 denotes a cylindrical transmission body, one end of which is inserted into the inner peripheral portion of the driving body 1 on the large diameter side, and forms a wedge-shaped space between the outer diameter portion of the one end and each notch 1a. A pinion 3 is formed on the outer periphery of the other end of the transmission body 2, and is advanced to engage with a ring gear of an engine (not shown).

Reference numeral 4 denotes a plurality of cylindrical rollers inserted in the wedge-shaped spaces so as to be movable in the circumferential direction, and reference numeral 5 denotes a compression spring for pressing the rollers 4 in the narrow direction of the wedge-shaped spaces. The driving body 1 is provided with a radially projecting portion 1b from the inner peripheral portion on the narrow side of each notch 1a so that the movement of the roller 5 to the narrow side of the wedge-shaped space can be received within a predetermined limit. ing. 6 is a pair of two-divided washers located on the outer end side of each roller 5, 7 is a packing applied to the outer ends of these washers, and 8 is fixed to the outer circumference of the large diameter portion of the driving body 1 by caulking and fixing. A cover for fixing the washer 6 through the packing 7, 9 is a sleeve bearing fixed to the inner diameter portion of the transmission body 2 and rotatably supported by the rotating shaft, and 10 is an annular groove on the rear end side of the small diameter portion of the driving body 1. The washer loosely attached to the shaft engages the engagement roller (not shown) of the shift lever in the axial direction.

The operation of the above conventional device is as follows.
When a starter motor (not shown) is started, the drive lever 1 is moved forward by the shift lever, and is rotated in the direction of arrow A, the roller 4 rolls and bites into the narrow side of the wedge-shaped space, resulting in a wedge action. Thus, the driving body 1 and the transmission body 2 are fixedly connected by a frictional force, and the transmission body 2 is integrally transmitted in rotation. As a result, the pinion 3 engages with the ring gear of the engine and rotates, thereby starting the engine.

At this time, if the engine is locked for some reason and the starting operation is further continued, the roller 4 abuts against the locking portion 1b at the rear of the cutout portion 1a, and is received. As shown in, at the receiving point Qa, the starting torque is not transmitted beyond a certain limit.

Further, as shown in FIG. 6, by changing the contact position of the engaging portion 1a of the driving body 1 to any one of α ₁ , α ₂ and α ₃ , the transmission position is changed. The torque can be suppressed to a predetermined value to prevent damage to the overrunning clutch.

[0007]

In the conventional method of manufacturing an overrunning clutch as described above, the drive body 1 is generally processed by die forging, but in order to suppress the predetermined transmission torque, the drive member 1 is not processed in the large diameter portion. If the locking portion 1b on the peripheral portion is to be changed to a shape in which the roller 4 comes to a desired contact position, a new forging die has to be manufactured, which increases the price, and
There is a problem that the manufacturing process becomes long.

The present invention has been made in order to solve such a problem, and it is not necessary to change the locking portion of the driving body, and the narrow portion of the wedge-shaped space can be easily changed to a required size. An object of the present invention is to provide a method for manufacturing an overrunning clutch that can be manufactured at low cost.

[0009]

In the method of manufacturing an overrunning clutch according to the present invention, the outer diameter portion of one end portion of the transmission body, which is inserted into the inner peripheral portion of the large diameter portion of the driving body, is made large in advance. By changing the diameter to a small diameter, the narrow portion of the wedge-shaped space between the drive body and the tapered notch portion has a required size.

[0010]

In the present invention, the outer diameter of the other end of the transmission member is machined to have a required size, so that the dimension of the narrow portion of the wedge-shaped space becomes a required size, and the roller is clamped to a predetermined size. Controlled by transmission torque, excessive transmission torque is avoided and damage is prevented.

[0011]

FIG. 1 is an explanatory view of a wedge-shaped space portion of a roller formed by a driving body and a transmission body, showing an embodiment of an overrunning clutch according to the present invention. , The description is omitted. A tapered notch 1a is formed on the inner circumference of the large-diameter portion of the driving body 1, and a locking portion 1b for abuttingly locking the roller 4 is provided at a predetermined position on the narrow side. The outer diameter portion 12a at one end of the transmission body 12 inserted corresponding to the inner periphery of the large diameter portion of the driving body 1 has a large diameter as shown by the solid line, and the wedge-shaped space is made small in the radial direction. .

When the driving motor 1 is rotated by the start of the starting motor, the roller 4 moves to the narrow portion of the wedge-shaped space, and the transmission torque increases as it bites, but when it abuts on the locking portion 1b, The wedge effect stops increasing, and the transmission torque is suppressed to the value at this biting position. Roller 4 shown by the solid line
Indicates the bite state in the case of the outer diameter portion 12a. Figure 2
The curve Ta shown in is the transmission torque in the case of the outer diameter portion 12a, and is suppressed to the transmission torque Ta at the contact position Qa where the roller 4 abuts the locking portion 1b.

Next, when it is desired to lower the upper limit of the transmission torque for protection, the diameter is reduced, as shown by the chain line in FIG. Then, since the roller 4 has a large narrow portion of the wedge-shaped space as shown by the chain line, the elastic deformation amount due to the biting is larger than that in the case of the solid line in the state of being brought into contact with the locking portion by the rotation of the driving body 1. Get smaller. As a result, as indicated by the curve Tb shown in FIG. 2, the transmission torque Tb is suppressed to a small value at the contact position Qb with the locking portion 1b.

As described above, it is sufficient to change the outer diameter of the enlarged one end portion of the transmission body 12 to a small diameter, which can be easily performed by machining, and the wedge-shaped space with the cutout portion 1a can be narrowed. The required radial transmission torque Tb
Can be suppressed to.

[0015]

As described above, according to the present invention, by changing the outer diameter of the enlarged one end portion of the transmission body to a predetermined small diameter, the wedge between the drive body and the tapered notch portion is formed. The dimension of the narrow part of the space is changed in the radial direction, the required transmission torque is suppressed, the maximum transmission torque can be easily set, damage is prevented and protected, the transmission body can be easily processed, high precision, An inexpensive manufacturing method can be provided.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the biting of a roller in a narrow portion of a wedge-shaped space showing an embodiment of an overrunning clutch according to the present invention.

FIG. 2 is an operational characteristic diagram of the overrunning clutch due to the biting of the roller in FIG.

FIG. 3 is a side view showing a cross section of an upper half of a conventional overrunning clutch.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is an operating characteristic diagram of the overrunning clutch in each case where the contact position of the locking portion of the driving body in FIG. 4 is changed.

6 is an explanatory diagram showing the relationship between the roller bite in the narrow portion of the wedge-shaped space of FIG. 4 and its angular position.

[Explanation of symbols]

 1 Driver 1a Notch 1b Lock 4 Roller 12 Transmitter 12a, 12b Outer diameter

Claims (1)

[Claims] 1. A cylindrical drive body having a plurality of tapered notches formed in the inner peripheral portion in the circumferential direction, and one end portion inserted into the inner peripheral portion of the drive body, and the outside of the one end portion. A transmitting body that forms a wedge-shaped space between the diameter portion and the cutout portion, and a roller that is mounted in the wedge-shaped space so as to be movable in the circumferential direction. In a device that transmits a driving force to a transmission body by unidirectional rotation, an inwardly projecting locking portion is provided at a fixed position in the circumferential direction on an inner peripheral portion of the drive body at a narrow side position of the wedge-shaped space. , The engaging portion causes the roller to abut at a biting position in a narrow portion of the wedge-shaped space, and the amount of biting of the roller at the abutting position is made larger in advance at one end of the transmission body. Limit to the required amount by changing the diameter of the outer diameter part to a smaller diameter, A method for manufacturing an overrunning clutch, wherein an upper limit of transmission torque in one direction is suppressed to a predetermined value.