JPH0583462U - Elastic shaft coupling - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce costs and improve steering feeling in elastic shaft couplings. [Structure] Inner surface 10d, 1 of arm portion 100 of yoke 10
0d and a predetermined gap t from each other, and when the side surface portion 13b is rotated around the axis, the side surface portion 13b forms the inner surfaces 10d and 10d of the arm portion 100.
A stopper plate 13 that engages with is provided on the tip 12a of the shaft 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an elastic shaft coupling that achieves cost reduction and steering feel improvement.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 5, in a steering shaft of an automobile, for example, a yoke 2A fixed to an end of a shaft 1 on a steering wheel side and a yoke 2B fixed to an end of a shaft 3 on a steering wheel side are crossed. An elastic shaft joint (universal joint) 5 connected by a pin 4 is provided (see Japanese Patent Publication No. 57-45925).

Specifically, as shown in FIGS. 3 and 4, the elastic shaft coupling 5 has connecting holes 2a, 2a for the cross pin 4 formed in the arm portion 20 on one end side of one yoke 2A. A fitting hole 2b is formed in the middle portion, and a stopper hole 2c is formed in the base portion 21 on the other end side.

A sleeve 8a baked onto the outer peripheral surface of an elastic member (rubber damper) 6 is press-fitted into the fitting hole 2b of the yoke 2A and fixed, and baked into the insertion hole 6a of the elastic member 6. The end portion 1a of the shaft 1 is press-fitted and fixed to the sleeve 8b, while the serration a formed on the outer peripheral surface of the end portion 1a of the shaft 1 has a predetermined gap in the rotational direction from the stopper hole 2c. A stopper plate 7 that separates t is engaged and fixed.

When the handle is turned, torque is transmitted from the shaft 3 to the yoke 2B, the cross pin 4, the yoke 2A, and the shaft 1 in this order, and the steered wheels are steered.

The elastic member 6 is provided to prevent the vibration of the automobile from being transmitted to the steering wheel, and when a small torque is transmitted such as steering during traveling of the automobile, its elastic force causes a force between the shaft 1 and the yoke 2A. Torque transmission. Further, during transmission of a large torque such as steering while the vehicle is stopped, the stopper plate 7 rotates with respect to the yoke 2A due to the deformation of the elastic member 6, and the stopper hole 2c of the yoke 2A and the stopper plate 7 are engaged with each other. According to the combination, torque is transmitted between the shaft 1 and the yoke 2A.

[0007]

[Problems to be solved by the device]

 However, since it is necessary to process the stopper hole 2c in the yoke 2A in a separate process, the cost is increased. Further, since the stopper hole 2c and the connecting hole 2a are provided on the other end side and the one end side of the yoke 2A, and the position of the stopper hole 2c and the position of the connecting hole 2a for the cross pin 4 are separated, a large torque transmission is achieved. At times, there are problems such as poor torsional rigidity and poor steering feel.

[0008] Therefore, an object of the present invention is to provide an elastic shaft coupling that can realize cost reduction, improvement of steering feeling, and the like.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a yoke having a connecting hole for a cross pin in an arm portion on one end side and an axial fitting hole in a base portion on the other end side, and an insertion hole in a shaft core. An elastic member fitted in the fitting hole of the yoke and at least a part of the outer peripheral surface of which is fixed to the yoke, and inserted into the insertion hole of the elastic member and fixed to the elastic member. A shaft member, and an inner surface of the arm portion of the yoke, which is provided at the tip of the shaft member, and which has a predetermined gap, and a stopper which engages with the inner surface of the arm portion when rotated around the axis. It is characterized by

[0010]

[Action]

 According to the elastic shaft coupling of the present invention, the stopper provided on the shaft member engages with the inner surface of the arm portion of the yoke when a large torque is transmitted. In other words, the inner surface of the arm portion functions as a stopper hole in the conventional example, and the stopper hole as in the conventional case is unnecessary, so that the cost is reduced. Also, unlike the conventional example in which the stopper is placed on the side opposite to the arm, the stopper is placed on the side of the arm, so compared to the conventional example in which the stopper is placed on the side opposite to the arm, The position of the connecting hole for the cross pin of the arm part can be made closer to each other, and compared with the conventional example, the torsional rigidity of the yoke at the time of transmission of a large torque in which the stopper and the inner surface of the arm part engage with each other is increased and the steering feel is increased. The ring improves.

[0011]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. As shown in FIGS. 1 and 2, the elastic shaft coupling is basically composed of a yoke 10, an elastic member 11, a shaft (shaft member) 12, and a stopper plate 13.

In the yoke 10, connecting holes 10a, 10a for cross pins (not shown) are formed in the fork-shaped arm portion 100 on one end side, and an axial fitting hole is formed in the base portion 101 on the other end side. 10c is formed. The depth of the fitting hole 10c can be set to a depth l3 that is about half the length of the elastic member 11.

The elastic member 11 is a cylindrical rubber damper, has an insertion hole 11a, and a sleeve 14a is baked and fixed on the outer peripheral surface thereof.

The shaft 12 is a shaft on either the steering side or the steering wheel side, and a serration a is formed at the tip 12a.

The sleeve 14 a fixed to the outer peripheral surface of the elastic member 11 is press-fitted and fixed in the fitting hole 10 c of the yoke 10, and the shaft 12 is inserted into the insertion hole 11 a of the elastic member 11. The shaft 12 is directly baked and fixed in the insertion hole 11a. A sleeve (not shown) may be baked and fixed in the insertion hole 11a of the elastic member 11, and the sleeve may be press-fitted into the shaft 12 and fixed. Instead of fixing the sleeve 14a to the outer peripheral surface of the elastic member 11, the outer peripheral surface of the elastic member 11 may be directly baked into the fitting hole 10c of the yoke 10 to be fixed.

The stopper plate 13 is formed in a substantially square shape, and the center hole 13 a of the stopper plate 13 is fixed in association with the serration a of the tip 12 a of the shaft 12, and the stopper plate 13 is The side surface portions 13b, 13b are separated from the inner surfaces 10d, 10d of the arm portion 100 of the yoke 10 by a predetermined gap t. The stopper plate 13 may be provided integrally with the tip 12a of the shaft 12. Further, the stopper plate 13 and the shaft 12 may have an oval engagement fixing structure or a welding fixing structure instead of the fixing structure by serration engagement.

With the above configuration, when a large torque is transmitted, the stopper plate 13 rotates around the axis of the shaft 12 with respect to the yoke 10 due to the deformation of the elastic member 13, so that the inner surface of the arm portion 100 of the yoke 10 is rotated. The stopper plate 13 of the shaft 12 is engaged with 10d, 10d, and the torque transmission between the yoke 10 and the shaft 12 is achieved by the engagement between the side surface portions 13b, 13b of the stopper plate 13 and the inner surfaces 10d, 10d of the arm portion 100. Is done. That is, the inner surfaces 10d, 10d of the arm portion function as stopper holes of the conventional example, and the yoke 10 does not need the stopper holes of the prior art, so that the machining cost is reduced.

Further, unlike the conventional example, since the stopper plate 13 is arranged on the arm portion 100 side, the position of the stopper plate 13 and the arm of the yoke 10 are different from those of the conventional example in which the stopper is arranged on the side opposite to the arm portion. The distance from the position of the connecting hole 10a for the cross pin of the portion 100 can be shortened, and the torsional rigidity of the yoke 10 at the time of transmitting a large torque is increased, and the steering feeling is improved.

Further, when the elastic member 11 is fitted and fixed in the fitting hole 10c of the base portion 101 on the other end side of the yoke 10 by the axial length l3, the length of the yoke 10 is l1 to l4. The yoke 10 can be made lighter.

[0020]

As is apparent from the above description, in the elastic shaft coupling of the present invention, the stopper provided at the tip of the shaft member is engaged with the inner surface of the arm portion of the yoke when transmitting a large torque. It is the one. Therefore, the conventional stopper hole is not required in the yoke, and the processing cost can be reduced. Also, unlike the conventional example, since the stopper is placed on the arm side, the distance between the position of the stopper and the position of the connecting hole for the cross pin of the arm can be shortened compared to the conventional example. Compared with this, the torsional rigidity of the yoke during transmission of a large torque is increased, and the steering feeling can be improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of an elastic shaft coupling of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a side sectional view of a conventional elastic shaft coupling.

FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 5 is a perspective view of a conventional elastic shaft coupling.

[Explanation of symbols]

10 ... Yoke, 10a ... Connection hole, 10c ... Fitting hole, 10d
... inner surface, 11 ... elastic member, 12 ... shaft, 13 ... stopper plate, 13b ... side surface portion, 100 ... arm portion,
101 ... the base.

Claims (1)

[Scope of utility model registration request] 1. A yoke having a connecting hole for a cross pin in an arm portion on one end side and an axial fitting hole in a base portion on the other end side, and an insertion hole in a shaft core. An elastic member fitted into the fitting hole and at least a part of the outer peripheral surface of which is fixed to the yoke, a shaft member which is inserted into the insertion hole of the elastic member and fixed to the elastic member, and a shaft member of the shaft member. An elastic shaft coupling which is provided at the tip, and is provided with an inner surface of the arm portion of the yoke and a stopper which separates a predetermined gap and engages with the inner surface of the arm portion when rotated around the axis. .