JP2003287055A - Roller bearing for joint cross and thrust washer used for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide normal washer abrasion by reducing uneven abrasion of a thrust washer of a roller bearing for a joint cross. <P>SOLUTION: The thrust washer 7 is formed in a hollow truncated conical shape a cross-section surface of which is annular, fixed on the side of an outer ring cup 8 by press-fitting a disc type outer peripheral part on an inner peripheral surface of the outer ring cup 8 as a disc type by pressurizing it in the axial direction of the joint cross 4, made not to slide on a contact surface of the thrust washer 7 and a bottom surface of the outer ring cup 8, and reduced in uneven abrasion on an edge part of a ring groove 8a on an outer periphery of the bottom surface of the outer ring cup 8 for a grinding undercut. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross shaft roller bearing and a thrust washer used therefor.

[0002]

2. Description of the Related Art Generally, in a torque transmission path of a vehicle or the like, a cross shaft is connected when two rotary shafts which are installed non-coaxially or are tiltable non-coaxially are connected to each other. Joints are used.

A conventional example is shown in FIGS. 8 in the figure
Reference numeral 1 is a cross joint, 82 is a first yoke, and 83 is a second yoke. The cross shaft joint 81 includes a cross shaft 84 and four roller bearings 85 for the cross shaft. Each of the roller bearings 85 has the same configuration and includes a plurality of needle rollers 86, a thrust washer 87, an outer ring cup 88, and an oil seal 93.

Each of the first and second yokes 82 and 83 has a pair of projecting pieces 89 facing each other in parallel. The pair of projecting pieces 89 are provided with a coaxial circular through hole 90.

Two trunnions 91 opposed to the through-hole 90 provided in the pair of projecting pieces 89 of the first yoke 82 by 180 degrees on the cross shaft 84, and the second yoke 8 are also provided.
The two trunnions 91 facing the remaining 180 degrees of the cross shaft 84 with respect to the through holes 90 provided in the pair of protruding pieces 89 of No. 3
Are fitted and mounted via the roller bearings 85, respectively.

The roller bearings 85 are provided on both yokes 8
By engaging the snap ring 92 with the outer opening of the through hole 90 provided in each of the projecting pieces 89 of Nos. 2 and 83,
It is designed to be retained.

[0007]

FIG. 10 is an enlarged cross-sectional view showing the vicinity of the cross shaft roller bearing 85. 8 and 9 show the cross section of the roller bearing 85 above the cross shaft 84, the cross section of the roller bearing below the cross shaft 84 is shown in FIG.

The roller bearing 85 for a cross shaft has a resin-made thrust washer 87 interposed between the end surface of the trunnion 91 of the cross shaft 84 and the bottom surface of the outer ring cup 88 for the purpose of preventing seizure. .

As shown in FIG. 10, an annular groove 88a for polishing escape is formed on the outer peripheral portion of the bottom surface of the outer ring cup 88 on which the thrust washer 87 is mounted.
Therefore, in the outer ring cup 88, the boundary between the annular groove 88a and the bottom surface is an edge. Therefore, while having such an edge structure, the thrust washer 87
Has a structure capable of sliding with respect to the bottom surface of the outer ring cup 88, and therefore, when sliding occurs at the contact surface between the outer ring cup 88 and the thrust washer 87, uneven wear occurs in the thrust washer 87 due to the edge portion. Will be done.

[0010]

In order to achieve the above-mentioned object, the present invention is constructed as follows.

That is, the roller bearing for the cross shaft of the present invention is
A roller bearing for a cross shaft, which is rotatably attached to a cross shaft trunnion, wherein an outer ring cup is fitted onto the cross shaft trunnion, an inner peripheral surface of the outer ring cup and an outer peripheral surface of the cross shaft trunnion. A plurality of rollers interposed between the outer ring cup and a thrust washer disposed between the bottom face of the outer ring cup and the end face of the trunnion of the cross shaft, wherein the thrust washer is integrally formed on the outer ring cup side. Fixed.

According to the present invention, since the thrust washer is fixed to the outer ring cup, the sliding at the contact surface between the outer ring cup and the thrust washer is suppressed, and the sliding at the contact surface between the thrust washer and the trunnion of the cross shaft. As a result, uneven wear of the conventional thrust washer is reduced and normal washer wear is achieved.

In the present invention, preferably, the outer ring cup has a recess in the bottom surface thereof, and the thrust washer is press-fitted in a state of being elastically deformed in the recess and being bulged in the radial direction. It is fixed integrally to the cup side.

In such a case, it is preferable that the thrust washer can be easily fixed to and removed from the outer ring cup.

In the present invention, preferably, the thrust washer can be radially expanded and deformed when it is compressed in the axial direction, and the end face of the trunnion of the cross shaft and the bottom face of the outer ring cup are formed. As a state in which the outer ring cup bottom surface side is prevented from radially expanding deformation in the radial direction associated with the compression by pressing in the axial direction between them,
The expanding deformation force may be integrally fixed to the outer ring cup side.

In this case, it is preferable that the thrust washer can be fixed to the outer ring cup by a simple operation only by disposing the thrust washer on the bottom surface of the outer ring cup and fitting the trunnion of the cross shaft into the outer ring cup.

The bottom surface of the outer ring cup includes steps, protrusions and the like formed on the bottom surface of the outer ring cup.

[0018]

DETAILED DESCRIPTION OF THE INVENTION The details of the present invention will be described below with reference to the embodiments shown in the drawings.

1 to 7 show an embodiment of the present invention. In the figure, 1 is a cross joint. The cross joint 1 connects a first yoke 2 and a second yoke 3, which are coaxially opposed to each other, in a torque-transmittable and tiltable manner.

The cross joint 1 includes a cross shaft 4 and four roller bearings 5 for the cross shaft according to the present invention. The cross shaft 4 has four trunnions 41 to 44.

As the roller bearing 5, what is called a needle roller bearing having the same structure is used, and it is provided with a plurality of needle rollers 6, a thrust washer 7 according to the present invention, and an outer ring cup 8. There is. Further, as shown in FIG. 4, the outer ring cup 8 of the roller bearing 5 and the trunnions 41 to 41 of the cross shaft 4 are provided.
An oil seal 9 for sealing an annular space between the roller bearings 44 and 44 is provided, and a lubricant such as grease is sealed in the roller bearing 5.

The first and second yokes 2 and 3 are attached to the cross joint 1. These two yokes 2, 3 are
Each of them has a shape in which a pair of projecting pieces 21, 22, 31 and 32 facing in parallel to the trunnion of the cylindrical body are provided. Each of the pair of projecting pieces 21, 22, 31, 32 has a circular through hole 23, 24, 33, 34 having a coaxial shape.
Is provided.

2 facing each other 180 degrees on the cross shaft 4
The two trunnions 41, 42 are fitted and mounted in the through holes 23, 24 provided in the pair of projecting pieces 21, 22 of the first yoke 2 via the roller bearings 5, 5. In addition, the two trunnions 43 and 44 facing the remaining 180 degrees of the cross shaft 4 are provided in the pair of projecting pieces 31 and 32 of the second yoke 3 through hole 3
The roller bearings 5 and 5 are fitted into and mounted on the rollers 3 and 34.

The roller bearings 5 are provided with through holes 23, 2 provided in the projecting pieces 21, 22, 31, 32 of the yokes 2, 3.
The snap ring 10 capable of elastically expanding and contracting the diameter of the outer openings 4, 33, 34 is engaged and mounted so as to be prevented from coming off.

The present embodiment is characterized by having the following structure in order to reduce uneven wear of the thrust washer 7 of the roller bearing 5 mounted on the trunnion of the cross shaft 4 so as to be rotatable relative to each other. Hereinafter, FIGS. 5, 6 and 7 (a) (b)
The features of the present embodiment will be described with reference to (c).

First, a description will be given with reference to FIGS. 5 and 6. FIG. 5 shows a state immediately before mounting the trunnion 41 of the cross shaft 4 to the roller bearing 5, and FIG.
The trunnion 41 of FIG.

The outer ring cup 8 includes a cylindrical portion 8b and a disc portion 8c.
It has a bottomed cylindrical shape that is integrated with.

The cylindrical portion 8b has an inner diameter capable of accommodating the trunnion 41 of the cross shaft radially inward and the plurality of needle rollers 6 on the outer side of the trunnion 41 of the cross shaft 4 in the radial direction. . Inside the opening edge of the cylindrical portion 8b,
An annular step 8b1 for mounting the oil seal 9 is formed.

The disk portion 8c corresponds to the end portions of the plurality of needle rollers 6 and is radially outwardly annular and has a substantially flat outer diameter side region 8.
It has a bottom surface composed of c1 and an inner diameter side region 8c2 which is located radially inward of the annular outer peripheral side region 8c1 and forms a circular recess with respect to the outer peripheral side region 8c1.

The outer diameter side region 8c1 and the inner diameter side region 8c2
An annular groove 8a is formed at the boundary between the groove and the groove for escape from the polishing. On the bottom surface of the disk portion 8c, the outer diameter side region 8c1
An annular vertical step wall surface 8d extending along the axial direction is formed between and the annular groove 8a, and the boundary between the annular groove 8a and the inner diameter side region 8c2 is an edge.

The thrust washer 7 is made of a synthetic resin material having elasticity and lubricity, such as polyacetal or polyamide, and has the form shown in FIG. 5 before the trunnion 41 of the cross shaft 4 is attached to the roller bearing 5. ing. The thrust washer 7 is formed of this synthetic resin material and has a structure capable of expanding and deforming in the radial direction when compressed in the axial direction.

The structure of the thrust washer 7 will be described in detail. The thrust washer 7 is a trunnion 41 of the cross shaft 4.
It has an annular tapered peripheral wall 7a as an axially protruding portion that is pressed by and has a through hole 7b in the center without a bottom surface, and the entire transverse shape is formed into a hollow truncated cone shape. The disk portion 8 of the outer ring cup 8 is on the bottom side.
It is arranged so as to be located in the inner diameter side region 8c2 surrounded by the annular vertical step wall surface 8d of c.

Annular taper peripheral wall 7a of thrust washer 7
Has an outer diameter substantially equal to or slightly smaller than the inner diameter of the annular step wall surface 8d in the disk portion 8c of the outer ring cup 8. Both sides of the outer peripheral edge of the annular taper peripheral wall 7a of the thrust washer 7 are chamfered 7c and 7d. One chamfer 7c has an outer diameter side region 8c1 of the outer ring cup 8 and an annular groove 8a on the bottom surface of the disk portion 8c. It is adapted to hit the vertical step wall 8d between them. In addition,
In FIG. 5, the thrust washer 7 is shown in a slightly exaggerated shape in order to make the operation of this embodiment easier to understand.

The thrust washer 7 having the above structure is
As shown in FIG. 5, it is arranged on the bottom surface of the outer ring cup 8.
Then, as shown in FIG. 6, the trunnion 41 of the cross shaft 4 is
When the outer ring cup 8 is fitted on the outer ring cup 7, the thrust washer 7
Is axially pressed and compressed between the end surface of the trunnion 41 of the cross shaft 4 and the bottom surface of the outer ring cup 8. By this compression, the thrust washer 7 is expanded and deformed in the radial direction (arrow A direction) accompanying the compression, and
It is blocked by the vertical step wall surface 8d on the bottom surface of the outer ring cup 8. Further, when the thrust washer 7 continues to be compressed by the pressing, the inner diameter side region 8c2 which is the recess is formed.
In the state of being elastically deformed and being pressed in the state of being stretched in the radial direction, it is integrally fixed to the outer ring cup 8.

The mounting and fixing of the thrust washer 7 will be described in more detail below with reference to FIG. 7 (a) is a state before the thrust washer 7 is attached to the bottom surface of the outer ring cup 8, FIG. 7 (b) is a state in which the thrust washer 7 is attached to the bottom surface of the outer ring cup 8, and FIG. 7 (c) is , The state in which the thrust washer 7 is pressed by the bottom surface of the outer ring cup 8 and the end surface of the trunnion 41 is shown.

The diameter of the inner diameter side region 8c2 of the bottom surface of the outer ring cup 8, that is, the inner diameter of the vertical step wall 8d is D1, the diameter of the thrust washer 7 is D2, and the through hole 7b of the thrust washer 7 is formed.
The diameter of is D3. In this case, the diameter D2 of the thrust washer 7 is set to be equal to or slightly smaller than the inner diameter D1 of the vertical step wall surface 8d. As shown in FIG. 7 (a), the thrust washer 7 is installed in the outer ring cup 8 as shown in FIG.
Inner diameter side region 8c surrounded by vertical step wall surface 8d on the bottom surface of
It is put in a state of being directed to 2, and is arranged on the inner diameter side region 8c2 as shown in FIG. 7 (b). At this time, the chamfer 7c of the thrust washer 7 allows the thrust washer 7 to be smoothly arranged in the inner diameter side region 8c2 without being caught by the vertical step wall surface 8d.

Then, as shown in FIG. 7C, the trunnion 41 (not shown in FIG. 7C) of the cross shaft 4 is attached to the outer ring cup 8.
When it is fitted into the thrust washer 7, the thrust washer 7
As a result of being compressed in the axial direction by the pressing of the trunnion 41, the diameter is expanded and deformed in the radial direction. Since the diameter D2 of the thrust washer 7 is set to be equal to or slightly smaller than the inner diameter D1 of the vertical step wall surface 8d, the radial expansion deformation in the radial direction due to the compression is generated on the vertical step wall surface 8d. Be blocked.

When the thrust washer 7 is further pressed from the trunnion 41 of the cross shaft 4 from its blocking state, the diameter expanding deformation force increases, and the diameter expanding deformation force stretches the thrust washer 7 against the vertical step wall surface 8d. It is elastically pressed in the state.

In this case, when the thrust washer 7 cannot be expanded in diameter, the thrust washer 7 is chamfered 7c and 7d on both sides of the outer peripheral edge, so that the tip of the thin outer peripheral edge is elastically deformed so as to be crushed. On the other hand, the inner diameter of the central through hole 7b is opposite to the arrow A direction and the diameter is as shown in FIG. 7 (b).
Since the diameter of the thrust washer 7 is reduced from D3 of FIG. 7 (c) to D3 ′ of FIG. 7 (c), the thrust washer 7 has It is inserted with almost no gap between them. In this fitted state, the thrust washer 7 is fixed to the bottom surface side of the outer ring cup 7 so as to rotate integrally with the outer ring cup 8.

When the thrust washer 7 is thus fixed to the bottom surface side of the outer ring cup 7, the thrust washer 7 rotates integrally with the outer ring cup 8 even if the cross shaft 4 and the bearing 5 rotate relative to each other. Sliding by the relative rotation,
This occurs on the contact surface between the thrust washer 7 and the trunnion 41 of the cross shaft 4, and the outer ring cup 8
Sliding at the contact surface between the thrust washer 7 and Therefore, when the cross shaft 4 and the bearing 5 rotate relative to each other, sliding occurs on the contact surface between the thrust washer 7 and the trunnion 41 of the cross shaft 4, resulting in normal washer wear and the bottom surface of the outer ring cup 8. Annular groove 8a
It is prevented that the edge portion of the is unevenly worn.

The present invention is not limited to the above embodiment, and various applications and modifications can be considered.

(1) The outer peripheral surface of the thrust washer 7 and the inner diameter side region 8c2, which is a recess in the bottom surface of the outer ring cup 8, may be roughened. As a result, slippage does not occur between the outer peripheral surface of the thrust washer 7 and the inner diameter side region 8c2 of the outer ring cup 8, and the thrust washer 7 can be more reliably fixed to the outer ring cup 8.

(2) An annular holding groove corresponding to the outer peripheral end of the thrust washer 7 is formed in a portion of the inner peripheral surface (inner side surface) of the outer ring cup 8 where the thrust washer 7 is pressed to contact the thrust washer 7. As the thrust washer 7 is pushed in the axial direction, the outer peripheral end of the thrust washer 7 is guided by the holding groove to be engaged and held in the holding groove.
May be held and fixed more stably by the outer ring cup 8 side.

(3) The shape of the thrust washer 7 may be such that it is expanded in the direction perpendicular to the axial direction by pressure in the axial direction and pressed against the inner peripheral surface of the outer ring cup 8, for example, the central portion. May have a curved shape so as to project in the axial direction.

[0045]

As described above, according to the present invention, since the thrust washer rotates integrally with the outer ring cup side, the contact surface between the outer ring cup and the thrust washer does not slide, and the thrust washer is not biased. Wear can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a cross joint according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a yoke is connected to the cross joint of FIG.

FIG. 3 is a partially cutaway plan view showing a connecting structure between a cross joint and a yoke in FIG.

FIG. 4 is a cross-sectional view taken along the line (4)-(4) of FIG.

FIG. 5 is an enlarged sectional view of a roller bearing portion.

FIG. 6 is an enlarged sectional view of a roller bearing portion.

FIG. 7 is a diagram for explaining pressing of a thrust washer by a cross shaft trunnion in the outer ring cup in the present embodiment.

FIG. 8 is a partially cutaway plan view showing a joint structure of a cross joint and a yoke according to a conventional example.

FIG. 9 is a sectional view taken along line (9)-(9) of FIG.

FIG. 10 is an enlarged sectional view of a conventional roller bearing portion.

[Explanation of symbols]

1 cross joint 2 first yoke 3 second yoke 4 cross axis 5 roller bearing 6 needle rollers 7 Thrust washer 8 outer ring cup

Claims (4)

[Claims] 1. A roller bearing for a cross shaft, which is rotatably mounted on a cross shaft trunnion, wherein an outer ring cup is fitted onto the cross shaft trunnion, an inner peripheral surface of the outer ring cup and the cross shaft. A plurality of rollers interposed between the outer surface of the trunnion and a thrust washer arranged between the bottom surface of the outer ring cup and the end surface of the trunnion of the cross shaft, wherein the thrust washer comprises: A roller bearing for a cross shaft, which is integrally fixed to the outer ring cup side. 2. The roller bearing for a cross shaft according to claim 1, wherein the outer ring cup has a recess on the bottom surface thereof, and the thrust washer is elastically deformed in the recess and radially extends. A roller bearing for a cross shaft, which is press-fitted in a state and integrally fixed to the outer ring cup side. 3. The cross shaft roller bearing according to claim 1, wherein the thrust washer has an axial protruding portion that can be radially expanded and deformed when compressed in the axial direction. The projecting portion is pressed in the axial direction between the end surface of the trunnion of the cruciform shaft and the bottom surface of the outer ring cup to be compressed, and the radial expansion accompanying the compression causes the radial expansion deformation in the outer ring cup. A roller bearing for a cross shaft, wherein the roller bearing for a cross shaft is in a state of being blocked at the bottom surface, and is integrally fixed to the outer ring cup side by its diameter expansion deformation force. 4. A thrust washer arranged between a bottom surface of an outer ring cup provided in a roller bearing and an end surface of a cross shaft trunnion fitted in the outer ring cup, the thrust washer being compressed when axially compressed. There is an axially projecting portion that can be radially expanded and deformed, and the projecting portion is pressed and compressed in the axial direction between the end surface of the trunnion of the cross shaft and the bottom surface of the outer ring cup. It has a structure in which the radially expanding deformation in the radial direction due to compression is blocked by the bottom surface of the outer ring cup, and is integrally fixed to the outer ring cup side by the radially expanding deformation force. Thrust washers characterized by the following.