JP7335150B2 - How to assemble a constant velocity universal joint - Google Patents

Description

The present invention relates to a constant velocity universal joint and its assembly method.

A constant velocity universal joint applied to a propulsion shaft and a drive shaft of an automobile includes an outer ring member having a plurality of grooves extending in the direction of the rotation axis on its inner peripheral surface, and grooves formed on the inner peripheral surface of the outer ring member for rolling. The power transmission member includes a moving power transmission member, a shaft member fitted inside the power transmission member, and a sealing member that seals an opening of the outer ring member.
As an example of a constant velocity universal joint, as shown in Patent Document 1, a tripod type constant velocity universal joint includes an outer ring member having a plurality of grooves extending in a rotation axis direction on a cylindrical inner peripheral surface, and an outer ring member. The power transmission member includes a power transmission member that slides in a groove, a shaft member that is internally fitted into the power transmission member, and a sealing member that seals an opening formed at one end of the outer ring member in the rotation axis direction.

In a cross-sectional view normal to the rotation axis, the power transmission member rolls on a cylindrical body, a trunnion having three legs equally distributed in the circumferential direction, and the outer peripheral surface of the legs. A needle roller bearing and a roller that rolls on a circumscribed circle of the needle roller bearing and slides in a groove of an outer ring member are provided.
Involute splines are formed on the inner peripheral surface of the cylindrical body of the trunnion. The power transmission member is fitted onto the involute spline formed on the small-diameter portion of the shaft member, fixed with a retaining ring, and assembled to the small-diameter portion of the shaft member.

Since constant velocity universal joints transmit a large amount of power while rotating at high speed, grease is sealed inside as a lubricant. In order to prevent the outflow of grease and the intrusion of muddy water from the outside, a sealing member is arranged at one end of the outer ring member in the rotation axis direction. One end side of the outer ring member is open with an opening, and the other end side is welded to a steel pipe, and the inside thereof is closed.
The sealing member comprises a steel cylindrical member and a rubber boot. One end of the cylindrical member grips the large-diameter portion of the boot portion, and the other end is fitted onto the outer ring member. The boot portion extends toward the outer ring member from the large diameter portion with a reduced diameter, is folded back and extends toward the large diameter portion side of the shaft member, and the outer fitting portion of the boot portion extends toward the shaft member. The fastening member is engaged with a groove formed on the outer peripheral surface of the outer fitting portion, which is fitted into the boot fitting groove.
In this manner, the inside of the constant velocity universal joint is sealed.

The steps for assembling the constant velocity universal joint include fitting the outer fitting portion of the sealing member to the shaft member, and then assembling the power transmission member. Grease is sealed in the outer ring member, and the shaft member assembled with the power transmission member and the sealing member is inserted. Here, when the cylindrical member of the sealing member starts fitting to the outer ring member, the inside of the constant velocity universal joint is sealed. Furthermore, when the cylindrical member is fitted to a predetermined position, the pressure inside the constant velocity universal joint becomes higher than the atmospheric pressure. In this case, the boot portion of the sealing member is deformed by the internal pressure, and if it is used as it is, it becomes impossible to follow the sliding and swinging movements of the constant velocity universal joint. Durability may be affected.

Therefore, as a prior art, an internal pressure adjusting structure is formed so as not to increase the internal pressure of the constant velocity universal joint when the cylindrical member of the sealing member is fitted. Techniques are disclosed.
Patent Literature 2 discloses a structure in which a cylindrical member of a sealing member is provided with a radially outwardly bulging groove extending in the rotation axis direction. In this structure, internal air is discharged while the cylindrical member is fitted, thereby suppressing an increase in the internal pressure of the constant velocity universal joint.
Patent Document 3 discloses a structure in which a ventilation groove communicating with an O-ring groove is formed on the outer peripheral surface of an outer ring member to which a cylindrical member of a sealing member is fitted. Similarly to the structure described in Patent Document 2, this structure also suppresses an increase in the internal pressure of the constant velocity universal joint by discharging internal air while fitting the cylindrical member.

Japanese Patent No. 5603285 JP-A-2000-310234 JP 2012-241882 A

BACKGROUND ART In recent years, in order to improve the fuel efficiency of automobiles, efforts have been made to reduce the size and weight of parts. When the weight of a constant velocity universal joint is reduced, the diameter is mainly reduced. In doing so, the length in the radial direction from the large diameter portion to the small diameter portion of the boot portion is reduced. In this case, since the boot portion is formed by folding back inside the cylindrical member, it is difficult to visually confirm whether or not there is any deformation. It is also difficult to

SUMMARY OF THE INVENTION The present invention has been devised to solve the above-described problems, and its object is to provide a constant velocity universal joint that reliably prevents an increase in internal pressure during assembly, and a method for assembling the same.

(First embodiment)
In order to solve the above-mentioned problems, a first aspect includes an outer ring member having a plurality of grooves extending in the direction of the rotating shaft on its inner peripheral surface, a power transmission member that rolls or slides in the grooves, and an outer ring on the outer ring member. A sealing member to be fitted, and a shaft member to which the sealing member and the power transmission member are fitted, wherein the shaft member has a first end in the direction of the rotation axis, the small-diameter portion to which the power transmission member is fitted. a large-diameter portion having an outer diameter larger than that of the small-diameter portion; a fitting groove provided between the small-diameter portion and the large-diameter portion in which the sealing member is fitted; and a temporary portion provided adjacent to the constant velocity universal joint, wherein a groove extending in a rotation axis direction is formed on an outer peripheral surface of the temporary portion.

(Second embodiment)
Further, in the first aspect, the sealing member has an outer fitting portion, at least a part of which is provided so as to fit the shaft member, protrudes toward the shaft member, and penetrates in the rotation axis direction. A partition portion having a through groove may be formed along the entire circumference of the inner peripheral surface of the outer fitting portion on the outer ring member side.

(Third embodiment)
Further, in the first aspect, the sealing member may be a boot member made of resin integrally molded from a portion to be fitted with the outer ring member to a portion to be fitted with the shaft member.

Moreover, in order to solve the above-mentioned problems, a second aspect provides that, when assembling the constant velocity universal joint according to the first aspect,
a fitting convex portion arranging step of arranging the fitting convex portion of the sealing member on the temporary portion;
a first fitting step of inserting the power transmission member arranged at the small diameter portion into the outer ring member and fitting the sealing member to the outer ring member;
a second fitting step of moving the fitting projection into the fitting groove and fitting the fitting projection after the fitting projection arrangement step and the first fitting step;
a fixing step of using a fastening member to fix the fitting protrusion and the fitting groove fitted in the second fitting step;
A constant velocity universal joint assembling method for assembling a constant velocity universal joint through

According to the present invention, it is possible to provide a constant velocity universal joint that reliably prevents an increase in pressure inside the universal joint, and a method for assembling the same.

It is a figure which shows the whole propulsion shaft 1 to which the constant velocity universal joint 7 of 1st Embodiment is applied. It is an enlarged view of the constant velocity universal joint 7 of 1st Embodiment. It is an enlarged view which shows the fitting state on the temporary part of a sealing member and a shaft member. It is an enlarged drawing which shows the fitting state of other Example on the temporary provision part of a sealing member and a shaft member. It is an enlarged drawing which shows the fitting state of other Example on the temporary provision part of a sealing member and a shaft member. FIG. 3 is a diagram showing a cross section AA in FIG. 2; FIG. 3 is a diagram showing another embodiment of section AA in FIG. 2; It is a figure which expands and shows the constant velocity universal joint 17 of 2nd Embodiment. FIG. 9 is a view showing a cross section BB in FIG. 8; It is a figure which expands and shows the constant velocity universal joint 27 of 3rd Embodiment. 4 is a flowchart for explaining a method of assembling the constant velocity universal joint 7; It is a figure explaining fitting convex part arrangement|positioning process S1. It is a figure explaining 1st fitting process S2. It is an enlarged view explaining 2nd fitting process S3. It is a figure explaining fixing process S4.

Embodiments of the present invention will be described with reference to the drawings. 3 to 7 show the state in which the boot member is placed on the temporary portion during the assembly process, for the convenience of explaining the operation and effect of the present invention.

1. Constant Velocity Universal Joint The constant velocity universal joints 7, 17 and 27 of each embodiment will be described with reference to the drawings. Technical elements common to each embodiment are given common reference numerals and descriptions thereof are omitted.

(First embodiment)
A constant velocity universal joint 7 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG.
As shown in FIG. 1, the propulsion shaft 1 has a first universal joint 2 arranged in front of the vehicle, a third universal joint 3 arranged in the rear of the vehicle, and a first universal joint 2 and a third universal joint. 3 has a second universal joint 7 disposed therebetween. An intermediate bearing 6 is provided in the vicinity of the second universal joint 7, and the intermediate bearing 6 is supported by a vehicle body floor (not shown) via a bracket 6e.
The first universal joint 2 and the third universal joint 3 are cross shaft type universal joints each supporting a cross shaft with a pair of yokes. The second universal joint 7 is a tripod type constant velocity universal joint.
A steel pipe 4 is welded and connected between the first universal joint 2 and the second universal joint 7 .
A steel pipe 5 is welded and connected between the third universal joint 3 and a shaft member 14 supported by the intermediate bearing 6 .

As shown in FIG. 2, the second universal joint 7 is open at one end, which is the end on the intermediate bearing 6 side. 2, a substantially cylindrical outer ring member 8 arranged at equal intervals, a power transmission member 10 arranged inside the outer ring member 8, a shaft member 14 fitted inside the power transmission member 10, and the outer ring member 8 and a sealing member 9 for sealing the opening 8c.

The open end side (intermediate bearing 6 side) of the outer ring member 8 has a fitting portion 8a in which the sealing member 9 is fitted on the outer peripheral surface thereof, and a caulking groove 8b for fixing the sealing member 9. Prepare.
The other end side (first universal joint 2 side) of the outer ring member 8 is joined to the steel pipe 4 by welding. The inner peripheral surface on the other end side is composed of an integral wall surface, and the outer ring member 8 has a laterally-oriented substantially cup-like shape.

The power transmission member 10 includes a trunnion 10a having three shafts centered on a cylindrical body portion and a needle roller rolling on the shafts of the trunnion 10a. 10b and a roller 10c arranged on the outer circumference of the needle roller 10b.
The needle roller 10b rolls on the shaft of the trunnion 10a, and the roller 10c slides in the groove 8e of the outer ring member 8, thereby causing the second universal joint 7 to swing and slide in the direction of the rotation axis X, while generating power. to communicate.

Grease (not shown) for lubrication is sealed inside the second universal joint 7, and a sealing member 9 is arranged to prevent the outflow of the grease and the infiltration of muddy water or the like from the outside. The sealing member 9 has a metallic cylindrical boot adapter 9a and a boot portion 9e.
One end of the boot adapter 9 a grips the other end (large diameter portion 9 d ) of the boot portion 9 e and the other end is fitted onto the outer ring member 8 of the second universal joint 7 . One end (outer fitting portion 9 f ) of the boot portion 9 e is fitted onto the boot fitting portion 14 b of the shaft member 14 and fixed by the fastening member 11 . The material constituting the boot adapter 9a is appropriately selected from cold-rolled steel plates and stainless steel plates. Examples of such metal materials include SPCC, SUS304, and the like.
The large-diameter portion 9d of the boot portion 9e is gripped by the gripping portion 9c of the boot adapter 9a by crimping the entire periphery thereof, and has a substantially U-shaped cross-sectional shape projecting toward the outer ring member 8. . The boot portion 9e is folded back to extend away from the outer ring member 8, and is fitted onto the shaft member 14 at the outer fitting portion 9f. A band groove 9g is formed on the outer peripheral surface of the outer fitting portion 9f, and the fastening member 11 is fastened. A fitting convex portion 9h is formed on the inner peripheral surface of the outer fitting portion 9f and fitted into the boot fitting groove 14b of the shaft member 14. As shown in FIG. Thus, the opening 8c of the outer ring member 8 is reliably sealed.
In addition, by folding the boot portion 9e, even if the boot portion 9e receives centrifugal force due to high-speed rotation of the propulsion shaft 1 and is deformed outward in the radius of rotation, the elastic force of the folded portion acts on the boot portion 9e. Therefore, the amount of deformation can be kept small. The material constituting the boot portion 9e is appropriately selected from synthetic natural rubber. Examples of such rubber materials include chloroprene rubber and silicone rubber.

The intermediate bearing 6 has a bearing 6b, a vibration isolating member 6a, an oil seal 6c, a bracket 6e, and a bearing fixing member 6f.
The bearing 6b is fitted onto the shaft member 14. As shown in FIG. The vibration isolating member 6a is internally fitted in the bracket 6e and internally fitted with the bearing 6b.
The bracket 6e has two legs extending in the width direction of the vehicle, each of which has a bolt hole formed on each of the right and left sides thereof, and is attached to the vehicle body floor (not shown) with bolts (not shown). In this manner, the propulsion shaft 1 is rotatably attached to the vehicle body.

The shaft member 14 has a large diameter portion 14e at one rear end and a small diameter portion 14a having a spline at the other front end. The power transmission member 10 is spline-fitted to the small-diameter portion 14 a and fixed by a retaining ring 12 . A steel pipe 5 is welded to the large-diameter portion 14e, and an intermediate bearing 6 is fitted onto the small-diameter portion. A fitting groove 14b into which the boot portion 9e of the sealing member 9 is fitted is formed in a substantially central portion between the large diameter portion 14e and the small diameter portion 14a of the shaft member 14, and a temporary fitting groove 14b is formed adjacent to the small diameter portion 14a side. A portion 14d is formed. The diameter of the temporary portion 14d is preferably larger than that of the fitting groove 14b.

A ventilation groove 14c extending in the rotation axis X direction is formed on the outer peripheral surface of the temporary portion 14d of the shaft member 14 . As shown in FIGS. 3 to 5, the length of the ventilation groove 14c in the direction of the rotation axis X is equal to the length of the constant velocity universal joint 7 when the fitting convex portion 9h of the sealing member 9 is arranged on the temporary portion 14d. There is no particular limitation as long as the inside and outside of the are communicated with each other. The ventilation groove 14c may communicate with the fitting groove 14b. Further, the position of the temporary portion 14d in the direction of the rotation axis X may be either before or after the fitting groove 14b.

As shown in FIGS. 6 and 7, at least one pair of the ventilation grooves 14c is on the outer peripheral surface of the temporary portion 14d, and at least one ventilation groove 14c is on the other ventilation groove in a cross-sectional view normal to the rotation axis X. It is preferable to form them in point-symmetrical positions about the center of symmetry of the shaft member 14 so that they are arranged above 14c in the vertical direction.
Grease is sealed in the outer ring member 8 of the constant velocity universal joint 7 in advance. By inserting the shaft member 14 and the power transmission member 10, a part of the grease is pushed out and flows into the inside of the sealing member 9, and flows into the ventilation groove 14c formed on the outer peripheral surface of the temporary portion 14d of the shaft member 14. If it reaches, it may become difficult to discharge the air inside the constant velocity universal joint 7 when assembling the constant velocity universal joint 7 .
Since at least one ventilation groove 14c is provided vertically above the other ventilation grooves 14c, even if the grease reaches the lower ventilation groove 14c due to gravity, the grease does not reach the upper ventilation groove 14c. , the air inside the constant velocity universal joint 7 can be reliably discharged to the outside.

Also, an involute spline may be formed on the outer peripheral surface of the temporary portion 14d.
The involute spline has a plurality of involute curve tooth profiles formed on the circumference and extending in the rotation axis X direction, and the grooves reaching the tooth bottom function as ventilation grooves. In addition, since an involute spline for fitting the power transmission member 10 is formed on the small diameter portion 14a of the shaft member 14, the ventilation groove 14c can be easily formed by using a rolling cutter for processing the involute spline. It becomes possible to form
According to the first embodiment configured in this way, it is possible to provide the constant velocity universal joint 7 that reliably prevents an internal pressure rise. Thereby, deformation of the sealing member 9 can be prevented.

(Second embodiment)
Next, an example in which the second embodiment of the present invention is applied to a constant velocity universal joint 17 will be described with reference to FIGS. 8 and 9. FIG.
In FIGS. 8 and 9, the same components as in the first embodiment of the present invention are denoted by the same numbers as in FIGS. 1 to 7, and the description thereof will be omitted as appropriate.
A constant velocity universal joint 17 differs from the constant velocity universal joint 7 of the first embodiment in a sealing member 19 .

The sealing member 19 has, on the inner peripheral surface of the fitting portion 19f, a partition portion 19i that protrudes toward the center of the rotation axis X and has a through groove 19j penetrating in the direction of the rotation axis X over the entire circumference.

Grease is sealed in the outer ring member 8 of the constant velocity universal joint 17 in advance. When the shaft member 14 and the power transmission member 10 are inserted, some of the grease flows into the sealing member 19 and reaches the ventilation groove 14c formed on the outer peripheral surface of the temporary portion 14d of the shaft member 14. There is a risk that the air inside the constant velocity universal joint 17 will not be discharged through the ventilation groove 14c due to clogging of the ventilation groove 14c.
A partition portion 19i having a through groove 19j that protrudes toward the rotation axis X and penetrates in the direction of the rotation axis X from the outer fitting portion 19f of the sealing member 19 to the inner peripheral surface of the outer ring member 8 over the entire circumference. Therefore, even if the grease sealed inside the outer ring member 8 flows into the inside of the sealing member 19, it is blocked by the partition portion 19i and does not reach the temporary portion 14d, causing clogging of the ventilation groove 14c. never Only the air inside the constant velocity universal joint 17 is discharged to the temporary portion 14d through the through groove 19j formed in the partition portion 19i, and the air can be reliably discharged to the outside through the ventilation groove 14c.
According to the second embodiment described above, it is possible to provide the constant velocity universal joint 17 in which the increase in pressure inside the constant velocity universal joint 17 is more reliably suppressed and the sealing member 19 is not deformed.

(Third Embodiment)
Next, a constant velocity universal joint 27, which is a third embodiment of the present invention, will be described with reference to FIG. In FIG. 10, the same numbers as in FIGS. 1 to 7 are assigned to the same configurations as in the first embodiment of the present invention, and the description thereof will be omitted as appropriate.
A constant velocity universal joint 27 differs from the constant velocity universal joint 7 of the first embodiment in a sealing member 29 .

The sealing member 29 extends from an outer fitting portion 29f, which is one end fitted to the fitting portion 14b of the shaft member 14, to the other end fitting to the fitting portion 18a of the outer ring member 18 of the constant velocity universal joint 27. The large-diameter portion 29b is integrally formed of a resin material. Between the large-diameter portion 29b and the outer fitting portion 29f, a plurality of conical wall surfaces 29k extending outward in the radius of rotation are continuously formed in a so-called bellows shape. According to the third embodiment configured in this manner, it is possible to provide a constant velocity universal joint 27 that reliably prevents an increase in internal pressure.
When the constant velocity universal joint 27 is used in an environment where the mounting angle formed by the rotation axis of the outer ring member 18 and the rotation axis of the shaft member 14 is large, the boot adapter portion and the boot portion may be different from each other. It cannot be used because the grip part interferes with the small diameter part of the boot part. However, with the boot 29 as in the present embodiment, in addition to the above effects, the problem of interference does not occur.
In addition, since a plurality of bent portions are formed between the adjacent conical wall surfaces 29k, even in an environment with a large mounting angle, the plurality of bent portions are appropriately deformed to allow rotation and bending. , it is possible to follow the movement of expansion and contraction.

The sealing member 29 can be formed by blow molding, for example. The material forming the sealing member 29 is appropriately selected from thermoplastic polyetherester elastomers. As such a resin material, a registered trademark Hytrel material manufactured by DuPont in the United States can be exemplified.

As mentioned above, although embodiment was described, this invention is not limited to this. For example, the same effect can be obtained by replacing the tripod type constant velocity universal joint with a Barfield type constant velocity universal joint or a double offset type constant velocity universal joint.
In addition, as a mounting structure of a sealing member that seals the connection portion of the assembly of the shaft-shaped member and the tubular member that requires internal pressure adjustment, for example, the spline sliding mechanism of the propulsion shaft, the rack shaft of the steering device, the damping It can also be applied to devices and the like.

2. Method for Assembling Constant Velocity Universal Joint As shown in FIG. 11, the method for assembling a constant velocity universal joint according to the present invention comprises a fitting projection arrangement step S1, a first fitting step S2, and a second fitting step S3. , and a fixing step S4.

2.1. Method for Assembling Constant Velocity Universal Joint 7 A method for assembling the constant velocity universal joint 7 will be described below with reference to FIGS. 3 to 7 and 12 to 15 .

(S1: Fitting Protrusion Arranging Step)
In the fitting protrusion arrangement step S1, after inserting the sealing member 9 into the shaft member 14, as shown in FIG. This is the step of arranging on the adjacent temporary portion 14d. A small-diameter portion 14a, which is a first end portion of the shaft member 14 in the direction of the rotation axis X, is formed with a spline, and the power transmission member 10 is spline-fitted to the small-diameter portion 14a. A groove for engaging the retaining ring 12 is provided in the small diameter portion 14a, and by engaging the retaining ring 12, the shaft member 14 and the power transmission member 10 are fixed in the rotation axis X direction.

(S2: first fitting step)
In the first fitting step, as shown in FIG. 13, a groove 8e formed in the inner peripheral surface of the outer ring member 8, which is filled with grease (not shown) therein, and a power transmission member 10 are fitted together. In this step, the fitting portion 9b of the sealing member 9 is fitted into the fitting portion 8a of the outer ring member 8 after the fitting portion 9b of the sealing member 9 is fitted into the fitting portion 8a of the outer ring member 8. As shown in FIG. When the fitting of the sealing member 9 is completed, a caulking roller (not shown) is pressed from the outer peripheral surface of the fitting portion 9b to caulk the caulking groove 8b provided on the outer peripheral surface of the outer ring member 8. Thereby, the outer ring member 8 and the sealing member 9 are fixed.
Here, when the outer fitting portion 9b of the sealing member 9 is fitted to the outer ring member 8, the internal volume of the constant velocity universal joint 7 gradually decreases. As shown in FIGS. 3 to 7, a ventilation groove 14c communicating between the inside and outside of the sealing member 9 is formed on the outer peripheral surface of the temporary portion 14d of the shaft member 14. The internal air is discharged, the internal pressure does not increase, and the sealing member 9 does not deform.

(S3: second fitting step)
The second fitting step S3 is a step performed after the fitting of the outer ring member 8 and the sealing member 9 is completed in the first fitting step S2. This is the step of moving the portion 9h to the fitting groove 14b of the shaft member 14. FIG. Since the sealing member 9 is made of an elastic material, it can be easily moved in the radial direction and the rotation axis direction.

(S4: Fixing step)
The fixing step S4 is a step performed after the fitting projection 9h of the sealing member 9 is moved to the fitting groove 14b of the shaft member 14 in the second fitting step S3. In this step, the fitting protrusion 9h and the fitting groove 14b are fixed by fastening the fastening member 11 to the band groove 9g provided on the outer peripheral surface of the member 9. As shown in FIG. This completes the assembly work of the constant velocity universal joint 7 . Since the ventilation groove 14c is not provided on the outer peripheral surface of the fitting groove 14b, the shaft member 14 and the sealing member 9 are reliably sealed, preventing grease from leaking and muddy water from entering from the outside. .

According to the method of assembling the constant velocity universal joint described above, it is possible to reliably prevent the pressure increase inside the constant velocity universal joint 7 and assemble the constant velocity universal joint 7 that does not cause deformation of the sealing member 9. , a method for assembling a constant velocity universal joint can be provided.

2.2. Method of Assembling Constant Velocity Universal Joint 17 The procedure for assembling the constant velocity universal joint 17 is the same as the procedure for assembling the constant velocity universal joint 7 . When assembling the constant velocity universal joint 17, the sealing member 19 is inserted into the shaft member 14, and the fitting convex portion 19h is arranged on the outer peripheral surface of the temporary portion 14d of the shaft member 14. As shown in FIG. Next, the power transmission member 10 is fitted to the spline portion 14a and fixed by the snap ring 12. As shown in FIG.
Subsequently, after sealing the grease inside the outer ring member 8, the shaft member 14 is inserted, and after the fitting portion 19b of the sealing member 19 is fitted to the outer ring member 8, a crimping roller is applied from the outer peripheral surface of the fitting portion 19b. (not shown) is pressed and crimped to the caulking groove 8b provided on the outer peripheral surface of the outer ring member 8, the outer ring member 8 and the sealing member 19 are fixed. During this time, the space volume inside the constant velocity universal joint 17 decreases, but the air inside the constant velocity universal joint 17 is discharged through the ventilation groove 14c formed on the outer peripheral surface of the temporary portion 14d of the shaft member 14, The pressure inside the constant velocity universal joint 17 is kept the same as the atmospheric pressure. The fitting portion 19h of the sealing member 19 is externally fitted into the fitting groove 14b of the shaft member and fixed by the fastening member 11, thereby completing the assembly work of the constant velocity universal joint 17. FIG.

2.3. Method of Assembling Constant Velocity Universal Joint 27 The procedure for assembling the constant velocity universal joint 27 is the same as the procedure for assembling the constant velocity universal joint 7 . When assembling the constant velocity universal joint 27, the sealing member 29 is inserted through the shaft member 14, and the fitting convex portion 29h is arranged on the outer peripheral surface of the temporary portion 14d of the shaft member 14. As shown in FIG. Next, the power transmission member 10 is fitted to the spline portion 14a and fixed by the snap ring 12. As shown in FIG.
Subsequently, grease is sealed inside the outer ring member 18 , the shaft member 14 is inserted, and the large diameter portion 29 b of the sealing member 29 is fitted onto the outer ring member 18 and then fixed by the fastening member 15 . During this time, the space volume inside the constant velocity universal joint 27 decreases, but the air inside the constant velocity universal joint 27 is discharged through the ventilation groove 14c formed on the outer peripheral surface of the temporary portion 14d of the shaft member 14, The pressure inside the constant velocity universal joint 27 is kept the same as the atmospheric pressure. The fitting portion 29h of the sealing member 29 is externally fitted into the fitting groove 14b of the shaft member and fixed by the fastening member 11, thereby completing the assembly work of the constant velocity universal joint 27. As shown in FIG.

7, 17, 27 constant velocity universal joint 8, 18 outer ring member 8e, 18e rolling groove 9, 19, 29 sealing member 9a cylindrical portion 9e boot member 9f outer fitting portion 9h, 19h, 29h fitting convex portion 10 power transmission Member 11 Fastening member 14 Shaft member 14a Small diameter portion 14b Fitting groove 14c Ventilation groove (groove)
14d temporary portion 14e large diameter portion 19i partition portion 19j through groove

Claims (1)

an outer ring member having a plurality of grooves extending in the rotation axis direction on its inner peripheral surface;
a power transmission member that rolls or slides in the groove;
a sealing member fitted onto the outer ring member;
A constant velocity universal joint comprising: a shaft member on which the sealing member and the power transmission member are fitted;
The shaft member
a small-diameter portion to which the power transmission member is fitted on the first end in the rotation axis direction;
a large-diameter portion having an outer diameter larger than that of the small-diameter portion;
a fitting groove provided between the small diameter portion and the large diameter portion and into which the sealing member is fitted;
a temporary part provided adjacent to the fitting groove in the direction of the rotation axis and in which the fitting convex part of the sealing member is temporarily arranged when the constant velocity universal joint is assembled;
When assembling the constant velocity universal joint in which a groove extending in the rotation axis direction is formed on the outer peripheral surface of the temporary portion,
a fitting convex portion arranging step of arranging the fitting convex portion of the sealing member on the temporary portion;
a first fitting step of inserting the power transmission member arranged at the small diameter portion into the outer ring member and fitting the sealing member to the outer ring member;
a second fitting step of moving the fitting projection into the fitting groove and fitting the fitting projection after the fitting projection placement step and the first fitting step;
a fixing step of fixing the fitting convex portion and the fitting groove fitted in the second fitting step using a fastening member;
A method of assembling a constant velocity universal joint, comprising:

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