JPH11108073A - Constant velocity joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constant velocity joint with the short whole length and of a light weight at a low cost. SOLUTION: This constant velocity joint is furnished with a first yoke 1; a second yoke 2; cross pins 17 and 18; a coupling yoke 3; a pin 23 provided at the tip of the first yoke 1; and a socket 24 provided at the tip of the second yoke 2. The first yoke 1 and the pin 23 are separate parts, and the second yoke 2 and the socket 24 are also separate parts. As a result, the joining parts 11 and 12 of the first yoke 1 and the second yoke 2 are never disturbed by the pin 23 and the socket 24, and they can be formed easily and integrally to the bases 5 and 6 of the first yoke 1 and the second yoke 2, by a serration process, for example. Consequently, a constant velocity joint with the short full length and of a light weight can be manufactured at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant velocity joint used for a steering device of an automobile.

[0002]

2. Description of the Related Art Conventionally, constant velocity joints
As shown in FIG. 3, it is used for a steering device of an automobile. The constant velocity joint 50 connects an automobile steering column shaft 51 as a drive shaft and an intermediate shaft 52 as a driven shaft, and rotates the steering 53 via the steering column shaft 51 and the constant velocity joint 50. Is transmitted to the intermediate shaft 52. In the pin-socket type constant velocity joint shown in FIG. 4, a first yoke 61 and a second yoke 62 are connected to a coupling yoke 70 via cross pins 63 and 64, respectively. In this constant velocity joint, a pin 65 integrally manufactured at the tip of the first yoke 61 and a socket 66 integrally manufactured at the tip of the second yoke 62 are fitted to each other to perform centering. I have.

[0003] However, such a constant velocity joint is
The first yoke 61 and the pin 65 are formed integrally, and
Since the second yoke 62 and the socket 66 are integrally formed, the pin 65 and the socket 66 become obstacles, and
The base 67 of the yoke 61 and the base 68 of the second yoke 62
In addition, there is a problem that serration using a broaching machine cannot be performed.

For this reason, a constant velocity joint 50 shown in FIG.
Then, serration processing is performed on the sleeves 54 and 55 as separate parts, and the sleeves 54 and 55 are welded to the base 56 of the first yoke and the base 57 of the second yoke, respectively.

[0005]

However, in the above-described constant velocity joint, since the serrated sleeve is welded to the yoke, there is a problem that the entire length of the constant velocity joint is increased and the weight is increased.
Further, in this constant velocity joint, there is a problem that the total cost is increased by welding the sleeve to the yoke.

Accordingly, an object of the present invention is to provide an inexpensive constant velocity joint having a short overall length and a light weight.

[0007]

In order to achieve the above object, a constant velocity joint according to the first aspect connects a first yoke to a coupling yoke via a cross pin,
A second yoke is connected to the coupling yoke via a cross pin, and the first centering component provided at the tip of the first yoke and the second centering component provided at the tip of the second yoke are linked to each other. In a constant velocity joint for performing centering, the first centering component is a component separate from the first yoke, and is joined to a tip of the first yoke, and the second centering component is separate from the second yoke. A part, which is joined to a tip of the second yoke, a joint is formed integrally with a base of the first yoke, and a joint is formed integrally with a base of the second yoke. Features.

According to the first aspect of the present invention, the first
The centering part is a part separate from the first yoke,
The second centering part is separate from the second yoke. Therefore, the joint of the first yoke is easily and integrally formed on the base of the first yoke without being hindered by the first centering component.
The joint of the second yoke is easily and integrally formed on the base of the first yoke without being hindered by the second centering component.

As described above, since the joint portion of the first yoke and the second yoke is easily and integrally formed at the base of the first yoke and the second yoke, the constant velocity joint having a short overall length and a light weight is provided. It can be manufactured at low cost.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

FIG. 1 is a partial sectional view of a constant velocity joint according to an embodiment of the present invention. This double cardan (double universal joint) type constant velocity joint includes a pressed first yoke 1 and a second yoke 2, and a pressed coupling yoke 3, and is a pin-socket type centering mechanism. have.

The first yoke 1 and the second yoke 2 are composed of bases 5, 6 and U-shaped parts 7, 8, respectively, and the joints 11, 12 of the bases 5, 6 have serrations about the center of the longitudinal axis. Processing has been applied. An end of a drive shaft (not shown) fits into the joint 11, and an end of a driven shaft (not shown) fits into the joint 12. Also, one bolt hole is provided on each of the outer peripheral portions of the bases 5 and 6 of the first yoke 1 and the second yoke 2, and bolts 13 and 14 are inserted into the bolt holes, respectively. By tightening 5 and 6, the drive shaft is securely connected to the first yoke 1 and the driven shaft is securely connected to the second yoke 2. First yoke 1
Are provided with pin holes 15 facing each other,
Both ends of the first cross pin 17 are rotatably fitted in these pin holes 15. Although not shown, the other pair of opposite ends of the first cross pin 17 are rotatably fitted into mutually opposed pin holes (not shown) of the coupling yoke 3. Similarly, a pin hole 16 is provided in the U-shaped portion 8 of the second yoke 2, and a pair of pins of the second cross pin 18 are fitted into these pin holes 16, and the second cross pin 18
Are rotatably fitted in pin holes (not shown) of the coupling yoke 3 facing each other.

Further, both ends of a first plate portion (not shown) are welded to both ends of the U-shaped portion 7 of the first yoke 1. A pin 23 as a first centering component is fixed to the center of the first plate portion. Both ends of a second plate portion (not shown) are welded to both ends of the U-shaped portion 8 of the second yoke 2. A socket 24 as a second centering component is formed at the center of the second plate portion. A spring 26 is arranged at the center of the bottom of the socket 24.
Therefore, the pin 23 of the first yoke 1 is
Is urged outwardly by the spring 26 in the socket 24 of FIG.

The constant velocity joint having the above structure operates as follows.

In FIG. 1, when a drive shaft (not shown) connected to the joint 11 of the first yoke 1 rotates, the first yoke 1 serrated and coupled thereto rotates. The first yoke 1 rotates the coupling yoke 3 via the first cross pin 17. Furthermore, the second cross pin 1
The second yoke 2 is rotated through 8. Then, the driven shaft serrated and coupled to the joint portion 12 of the second yoke 2 rotates.

At this time, the pin 23 attached to the tip of the first yoke 1 is fitted to the socket 24 attached to the tip of the second yoke 2 and the coupling yoke 3
, The inclination angles of the drive shaft and the driven shaft become equal, and the first yoke 1 and the second yoke 2 rotate at a constant speed.

In the constant velocity joint having the above structure, the first plate portion and the pin 23 (not shown), and the second plate portion and the socket 2
The centering component 4 is separate from the first yoke 1 and the second yoke 2. For this reason, unlike the case where the centering component is integrated with the first yoke 1 and the second yoke 2, the centering component does not hinder the processing, so that the joint portion 11 of the first yoke 1 and the second yoke 2 is formed. , 12 can be very easily serrated by a broaching machine. Thus, the base 11,
12 can be serrated, so that the joints 11 and 12 are connected to the bases 5 and 6 of the first yoke 1 and the second yoke 2.
A constant velocity joint having a short overall length and a light weight can be manufactured at low cost.

In this embodiment, the first yoke 1,
The joining between the second yoke 2 and the plate portion is performed by welding. However, as shown in FIG.
The end portion 34 of the plate portion 33 may be formed into an uneven fitting shape with a tightening margin, and the end portion 32 of the yoke 31 and the end portion 34 of the plate portion 33 may be fitted and fixed, and then, welding may be performed. . By using the yoke 31 and the centering plate portion 32 whose end portions 32 and 34 have an uneven fitting shape as shown in FIG. 2, accurate and accurate positioning of the centering component can be performed easily and reliably. Can be.

In the present embodiment, the yoke is manufactured by press working, but may be a cold forged product, a hot forged product, a sintered product, or a die cast product.

In this embodiment, the pin 23 is fixed to the first yoke 1 and the socket 24 is fixed to the second yoke 2, but the pins are fixed to both the first yoke and the second yoke, and the coupling is fixed. Socket portions may be provided on both sides of the moving plate provided on the yoke. That is, both the first and second centering components may be pins or sockets. In that case, socket portions or pin portions are provided on both sides of the movable plate.

[0021]

As is apparent from the above description, in the constant velocity joint of the first aspect, the first centering component is the first centering part.
Since the yoke is a separate component, the joint of the first yoke can be easily and integrally formed on the base of the first yoke without being hindered by the first centering component. Further, since the second centering component is a component separate from the second yoke, the joint of the second yoke is not hindered by the second centering component, and the second centering component is not hindered.
It can be easily and integrally formed at the base of the yoke. Therefore, the joint between the first yoke and the second yoke is
Since the yoke and the second yoke are easily and integrally formed at the bases, a constant-velocity joint having a short overall length and a light weight can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a constant velocity joint according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a joint portion between a yoke and a plate portion of the constant velocity joint of FIG.

FIG. 3 is a schematic view showing a steering apparatus of an automobile using a conventional constant velocity joint.

FIG. 4 is a schematic partial cross-sectional view of a conventional pin-socket type constant velocity joint.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... First yoke, 2 ... Second yoke, 3 ... Coupling yoke, 5, 6 ... Base, 11, 12 ... Joint, 1
7, 18 ... cross pin, 23 ... pin, 24 ... socket.

Claims (1)

[Claims] A first yoke is connected to a coupling yoke via a cross pin, and a second yoke is connected to the coupling yoke via a cross pin. In a constant velocity joint for performing centering by associating a centering part with a second centering part provided at a tip of the second yoke, the first centering part is a part separate from the first yoke. The second centering component is joined to the tip of the first yoke, and is separate from the second yoke. The second centering component is joined to the tip of the second yoke.
A constant velocity joint, wherein a joint is integrally formed at a base of the yoke, and a joint is integrally formed at a base of the second yoke.