JPH0880704A - Drive shaft - Google Patents

Abstract

PURPOSE: To provide a drive shaft by which any play in a fixed type constant- velocity joint can be reduced. CONSTITUTION: A sliding type constant-velocity joint 10 is coupled to one end of a shaft 1 and a fixed type constant-velocity joint 20 is coupled to the other end. A coil spring 30 for pressing the shaft 1 toward the fixed type constant- velocity joint 20 is built in the inside of an outer ring 11 of the sliding type constant-velocity joint 10, and hence any play in a fixed type constant-velocity joint 20 is reduced by the axial movement of the shaft 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile drive shaft.

[0002]

2. Description of the Related Art Generally, in a front drive shaft of an FF vehicle or a 4WD vehicle, as shown in FIG. 4, a constant velocity joint 43 is provided between the end of the shaft 40 on the differential 41 side and the end of the shaft 40 on the tire wheel 42 side. , 44 are attached.

A sliding constant velocity joint such as a tripod joint is used as the constant velocity joint 43 on the differential 41 side, while a constant angle joint 44 such as a ball fixed joint is large at the constant velocity joint 44 on the tire wheel 42 side. A fixed type constant velocity joint is used.

Here, if there is play between the outer ring and the cage of the fixed type constant velocity joint and between the fitting surfaces of the cage and the inner ring, noise and vibration occur and the so-called riding comfort deteriorates. It may be a cause. In order to reduce the backlash, in fixed type constant velocity joints, the parts that make up the joint are combined so that the clearance between the parts is small, and the serrations of the inner ring and shaft are fitted by press fitting. There is.

[0005]

However, even if a combination in which the clearance between the parts is reduced or press-fitting is adopted for selection fitting, it is impossible to eliminate the play of the fixed type constant velocity joint. In addition, there is a risk that backlash may occur due to wear during operation of the constant velocity joint, and NVH may occur due to the backlash.

An object of the present invention is to reduce backlash of a fixed type constant velocity joint and to suppress NVH from occurring.

[0007]

In order to solve the above problems, in the present invention, a sliding type constant velocity joint is connected to one end of a shaft and a fixed type constant velocity joint is connected to the other end. In the drive shaft, a construction is adopted in which a coil spring for pressing the shaft toward the fixed type constant velocity joint is incorporated inside the outer ring of the sliding type constant velocity joint.

In order to surely press the shaft in the axial direction even when the shaft rotates at an angle, a spherical surface is formed at one end of the shaft and the spherical surface is fixed to the other end of the coil spring. It uses a spherical seat to press.

Further, in order that a coil spring having a long effective length can be used without changing the axial length of the outer ring in the sliding type constant velocity joint, the coil is attached to the closed end surface of the outer ring in the sliding type constant velocity joint. It adopts a configuration in which an axial fitting hole into which one end of the spring is press-fitted is formed.

[0010]

As described above, the play of the fixed type constant velocity joint is reduced by incorporating the coil spring inside the outer ring of the sliding type constant velocity joint and pressing the shaft toward the fixed type constant velocity joint. Can be planned.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, a sliding type constant velocity joint 10 is connected to one end of the shaft 1 and a fixed type constant velocity joint 20 is connected to the other end.

The fixed type constant velocity joint 20 has an outer ring 21.
A ball 25 that is installed between the inner ring 22, the track groove 23 formed on the spherical inner surface of the outer ring 21, and the track groove 24 formed on the spherical outer surface of the inner ring 22 to transmit the rotation of the inner ring 22 to the outer ring 21; The cage 26 holds the ball 25.

The shaft 1 is inserted into the inner ring 22 and is engaged with each other by serrations 27. The serrations 27 are press-fitted into each other to form a connection without rattling, and are prevented from coming off by a flange 28 provided on the shaft 1 and a retaining ring 29 attached to an end portion of the shaft 1.

In the fixed type constant velocity joint 20, the outer ring 21 and the retainer 26 and the retainer 26 and the inner ring 22 are combined so as to reduce the clearance, but there is no play. However, NVH may be generated due to the presence of the looseness.

FIG. 2 shows details of the sliding type constant velocity joint. In this sliding type constant velocity joint, three track grooves 12 in the axial direction are provided on the inner diameter surface of an outer ring 11, and rollers 15 are rotatably attached to three leg shafts 14 provided on a tripod member 13. The tripod constant velocity joint 15 is movable along the track groove 12.

One end of the shaft 1 is inserted into the tripod member 13 and is connected to each other by serrations 16. In addition, the shoulder 17 provided on the shaft 1 and the retaining ring 1
It is locked in 8 and.

An axial fitting hole 19 is formed in the closed end surface of the outer ring 11, and one end of a coil spring 30 is press-fitted into the fitting hole 19. Coil spring 30
A projecting shaft 32 provided on the back surface of the spherical seat 31 is press-fitted into the other end of the.

The spherical seat 31 is pressed against a spherical surface 33 formed at one end of the shaft 1, so that the shaft 1 has a coil spring 3
0 is pressed toward the fixed type constant velocity joint 20.

As described above, by pressing the shaft 1 toward the fixed type constant velocity joint 20 by the coil spring 30, it is possible to reduce the backlash of the fixed type constant velocity joint 20 and suppress the occurrence of NVH. can do.

Further, since the shaft 1 is pressed through the spherical seat 31, even when the shaft 1 rotates at an angle, the coil spring 30 can reliably press the shaft 1 in the axial direction.

Here, since one end of the coil spring 30 is press-fitted into the fitting hole 19 and the other end thereof is press-fitted into the projecting shaft 32 of the spherical seat 31, at the time of handling before assembling the drive shaft to the vehicle. Even if the tripod member 13 moves outward and the spherical surface 33 of the shaft 1 separates from the spherical seat 31, the coil spring 30 and the spherical seat 3
1 is stably held on the center line of the outer ring 11.

Therefore, by assembling the drive shaft to the vehicle, the spherical surface 33 of the shaft 1 becomes the spherical seat 31.
Since the coil spring 30 is contracted by being pressed against, the shaft 1 can be reliably pushed by the coil spring 30.

FIG. 3 shows another embodiment of the present invention. In this embodiment, a press-formed product of a thin iron plate is used as the spherical seat 31, and the end of the coil spring 30 is press-fitted inside the cylindrical portion 34 formed on the outer periphery of the spherical seat 31.

Further, in order to improve the removal force of the coil spring 30 with respect to the fitting hole 19 and the cylindrical portion 34 of the spherical seat 31, several spiral rod portions 30a at both ends of the coil spring 30 are brought into close contact with each other.

In the embodiments, the tripod constant velocity joint is shown as the sliding constant velocity joint, but a double offset joint may be used.

[0027]

As described above, in the drive shaft according to the present invention, the coil spring is incorporated inside the outer ring of the sliding type constant velocity joint, and the shaft is pressed by the coil spring toward the fixed type constant velocity joint. Since this is done, it is possible to reduce play in the fixed type constant velocity joint and to suppress the occurrence of NVH.

Further, by providing the spherical seat between the coil spring and the spherical surface formed at one end of the shaft, the shaft can be surely pressed in the axial direction even when the shaft has an angle.

Further, a fitting hole into which one end of the coil spring is press-fitted is formed in the closed end surface of the outer ring of the sliding type constant velocity joint, so that the coil spring is stabilized and the drive shaft is assembled to the vehicle. Even if there is a gap between the coil spring and the shaft in the previous handling stage, by assembling the drive shaft, the shaft can be reliably returned to the state of being pressed axially, and a coil spring with a long effective length can be used. Can be used.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a drive shaft according to the present invention.

FIG. 2 is a cross-sectional view showing a connecting portion between the sliding constant velocity joint and the shaft of the same.

FIG. 3 is a cross-sectional view showing another example of the connecting portion between the sliding constant velocity joint and the shaft of the above.

FIG. 4 is a schematic view showing an assembled state of a drive shaft.

[Explanation of symbols]

 1 Shaft 10 Sliding Constant Velocity Joint 11 Outer Ring 19 Fitting Hole 20 Fixed Constant Velocity Joint 30 Coil Spring 31 Spherical Seat 33 Spherical Surface

Claims (3)

[Claims] 1. A drive shaft in which a sliding type constant velocity joint is connected to one end of a shaft and a fixed type constant velocity joint is connected to the other end, and the shaft is provided inside an outer ring of the sliding type constant velocity joint. The drive shaft is characterized by incorporating a coil spring that pushes toward the fixed type constant velocity joint. 2. The drive shaft according to claim 1, wherein a spherical surface is formed at one end of the shaft, and the spherical surface is pressed by a spherical seat fixed to the other end of the coil spring. 3. The drive shaft according to claim 1, wherein an axial fitting hole into which one end of the coil spring is press-fitted is formed in the closed end surface of the outer ring of the sliding type constant velocity joint.