JPH0661665B2 - Roller type universal joint assembling method and roller assembling unit used for implementing this method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for assembling a roller type universal joint such as a triport type constant velocity joint to a shaft such as a vehicle drive shaft, and a roller assembly used for carrying out this method. With attached unit.

(Prior Art) Assembling work of a roller type universal joint was carried out by assembling each roller to each protruding shaft of a spider attached to the end of a shaft, and then forming an outer case of the roller type universal joint on its inner peripheral surface. The phase is adjusted so that each roller groove is inserted into each roller, and the rollers are mounted around the spider.

According to Japanese Patent Application No. 63-65538, the applicant of the present application previously proposed that the X-axis around the spider be a radial line that aligns the projection axes of the spider with the assembly station on which the shaft is fixed. Each roller assembly unit is provided at a position corresponding to the direction, and each projection shaft can be inserted from the inside in the X-axis direction into the unit body that can move back and forth in the X-axis direction. A roller holder having an accommodating portion that can be retractably inserted in the axial direction is provided slidably in the shaft axial direction, and the unit main body of each roller assembly unit is advanced inward in the X-axis direction. Thus, each projection shaft of the spider is inserted into the storage portion of the roller holder from the inside in the X-axis direction, the roller previously stored in the storage portion is externally fitted to the projection shaft, and then the unit main body is held at the forward position. As it is The Utakesu proposed what was to be worn. According to this, when the outer case is mounted, the roller holder of each roller assembly unit is pushed by the end surface of the outer case and moves in the axial direction of the shaft, and each roller comes out of the housing portion of the roller holder and moves into the roller groove of the outer case. Inserted in.

(Problems to be Solved by the Invention) The roller holder of the roller assembling unit described above is configured to store the roller in the storage portion in such a posture that its axis matches the X axis. Since there is a clearance for inserting and removing the roller between the inner surface of the roller and the roller, even if the roller is housed in the housing part and assembled to the projection shaft, play and tilting of the roller in the X-axis direction occur, and As a result, when the outer case is mounted, a part of the roller may interfere with the edge of the roller groove, and the roller may not enter the roller groove.

For example, as shown in FIGS. 16, 17, and 11, when the roller is a flat roller having a square flange D ₁ a at the end of the bearing inner race D ₁ near the shaft, the outer case E The square flange D ₁ a is apt to interfere with the edge portion of the groove wall radially inward of the roller groove E ₁ shown by a in the figure, and the roller D is a spherical roller as shown in FIGS. 18 and 19. In some cases, the peripheral surface of the roller D tends to interfere with the end portion of the roller groove E ₁ indicated by b in the drawing in the radial direction due to the lateral tilt along the surface orthogonal to the shaft axis.

In view of the above problems, it is an object of the present invention to reduce the frequency of assembly errors by allowing a roller to be smoothly inserted into a roller groove when an outer case is mounted.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, when each roller is a flat roller having a square flange at the end of the bearing inner race near the shaft, the roller is The outer case is mounted while being elastically held in a predetermined tilted posture in which the axis of the projection shaft is slightly tilted in the opposite direction to the mounting direction of the outer case with respect to the X axis, which is the axis of each projection shaft. When each roller is a spherical roller, the outer case is mounted while elastically holding each roller in a posture inclined in the opposite direction to the above.

(Working) When the roller is a flat roller, if the above-mentioned inclined posture is adopted, the tail edge of the square flange located on the rear side in the mounting direction of the outer case will escape radially outward with respect to the a part of the outer case. , When mounting the outer case, the tail edge is a
The roller is inserted into the roller groove without interfering with the portion, and thereafter, the roller is corrected and inserted into the roller groove so as to be in a standing attitude along the roller groove against the elastic force that biases the roller in the inclined attitude.

When the roller is a spherical roller, if it is tilted in the opposite direction as described above, when the outer case is mounted, the edge of the groove wall on the radially outer side of the roller groove first comes into contact with the outer surface of the roller, and thereafter The lateral inclination of the roller is corrected by being guided by the groove wall, and the posture is corrected so as to be a standing posture along the roller groove, so that the roller is inserted into the roller groove without interfering with the portion b of the outer case. To be done.

Assemble the roller on the protruding shaft of the spider in the storage part provided in the roller holder of the roller assembly unit, and move the roller holder by the case in the axial direction of the shaft when the outer case is installed to store the roller. When it is inserted into the roller groove from the portion, an engaging member that elastically engages with the outer surface portion of the roller facing the mounting direction of the outer case is attached to the roller holder, and the roller is described above by the engaging member. It suffices to hold each of the predetermined inclined postures. When the roller is a flat roller, the engaging member is elastically engaged with the tip edge of the square flange of the roller located forward of the outer case mounting direction so as to press the tip edge toward the shaft side. With this configuration, the roller can be held in the inclined posture and the tilting of the square flange in the roller rotation direction can be prevented, interference with the outer case due to the tilting of the square flange does not occur, and the frequency of assembly errors can be reduced. It can be further reduced.

(Example) illustrated embodiment, after assembling the boot B on the end of the shaft A, such as a vehicle drive shaft, and a spider C having a projection axis C ₁ of the surrounding three angular projections axis C ₁ In addition, a tripod constant velocity joint is assembled by assembling the roller D and the spider C and the outer case E having roller grooves E ₁ at three locations around the inner peripheral surface.

The shaft A is conveyed to the assembling station in a vertical posture with the end portion to which the spider C is attached facing downward, and the assembling station is rotatably supported by a rotary shaft (2a) perpendicular to the base (1). The rotating plate (2) is provided, and the rotating plate (2) is provided with the roller setting jig (3) and the outer assembly jig (4) alternately at 90 ° intervals, one for each.
Provided to the pair, the rotating plate (2) is reduced by the motor (2b).
By rotating the index to 90 ° via c),
The jigs (3) and (4) are alternately moved to an assembling position directly below the shaft A, and a pedestal (5) located above the turntable (2) is provided, A transparent window (5a) concentric with the shaft A is formed on the pedestal (5), and radial lines to match the projection axes C ₁ of the spiders C are set as the X-axis, respectively, on the pedestal (5),
The roller assembling unit (6) and the clamper (7a) for holding the boot B on one side of the roller assembly unit (6) located at three places around the transparent window (5a) which coincides with the X-axis direction can be moved up and down and moved back and forth. It was equipped with a boot mounting unit (7).

In the roller setting jig (3), a center pin (9) that can be engaged with the center hole of the lower end surface of the shaft A is spring-loaded in a jig body (8) that is vertically movably inserted in a rotating plate (2). The guide shaft (10) inserted so that it can be retracted against (9a) is inserted into the jig body (8) while being able to move upward against the spring (10b) while being stopped by the key (10a). As shown in FIG. 3, a set member (11) having pockets (11a) for holding the roller D upwardly and freely detachably is attached to the upper end of the guide shaft, as shown in FIG. At the upper end of (10), V-shaped notches (12a) are formed at three locations around the cylinder surrounding the main body of the spider C to receive the projection axes C ₁ while aligning the phases so that they coincide with the X axis. The guide member (12) is formed by attaching.

The outer assembly jig (4) is provided with a holder (14) for the outer case E at the upper end of a jig body (13) which is vertically movably inserted through a turntable (2).
The main body (13) is provided with a collet (15) for gripping the shaft of the outer case E by a spring (15a) biasing it toward the lower side.

A common cylinder device for operating both the jigs (3) and (4) is provided in the lower part of the assembling position, and the device includes first and second cylinders (16) and (17) in two upper and lower stages. And both cylinders (16) (17)
And a third cylinder (18) that moves up and down, and each jig is attached to the upper end of the piston rod (16a) of the upper first cylinder (16).
(3) Engagement for accepting the flanges (8a) (13a) at the lower end of the jig body (8) (13) of (4) in the swivel direction of each jig (3) (4)
(16b) is attached so that the jig bodies (8) and (13) are moved up and down through the piston rod (16a), and the piston rod (17a) of the second cylinder (17) at the lower stage is attached. 1st cylinder
When the roller set jig (3) is inserted into the piston rod (16a) of (16) and moved to the assembly position, the guide shaft (1
(0) so that when the outer assembly jig (4) is moved to that position, the piston rod (16a) faces the lower end of the operation rod (15b) hanging on the collet (15). did.

As shown in FIG. 4 to FIG. 6, each roller assembly unit (6) has a cylinder (20a) and a guider (20b) on the base frame (19) fixed to the pedestal (5). A unit body (20) that moves forward and backward is provided, and a spring (21a) is attached to the unit body (20).
By providing a slide plate (21) that can move up and down against the above, the projection shaft C ₁ can be inserted into the slide plate (21) from the inside in the X-axis direction, and the roller D can be retracted vertically. Storage (22
While mounting the roller holder (22) formed by forming a),
At the tip of the unit body (20), a push rod (24) having a pin (23) insertable into the inner bush D ₂ of the roller D and retractable against the spring (23a) is attached by a cylinder (24a). When the push rod (24) is moved inward in the X-axis direction, the pin (23) is moved to the accommodating part (22b). (22a) is inserted into the inner bush D ₂ of the roller D so as to project into
The tip of the push rod (24) is brought into contact with the end surface of the inner bush D ₂ .

When assembling work, first move the roller set jig (3) to the assembling position, and push up the jig body (8) together with the guide shaft (10) to a predetermined assembling level to set the center pin (9). The shaft A is further centered, and the guide member (12) is used to phase-match each projection axis C ₁ of the spider C with the X axis.
Further, the roller D previously inserted and set in each pocket portion (11a) of the setting member (11) is inserted from below into the storage portion (22a) of the roller holder (22) of each roller assembly unit (6). next,
Push the push rod (24) of each roller assembly unit (6) inward in the X-axis direction, insert the pin (23) into the inner bush D ₂ of the roller D, and place the roller D in the storage section (22a). The core body is held in the aligned state, and then the jig body (8) is slightly lowered to advance the unit body (20) of each roller assembly unit (6) inward in the X-axis direction. According to this, each projection shaft C ₁ of the spider C is inserted from the inner side in the X-axis direction into the inner bush D ₂ of the roller D held in the storage portion (22a), and the pin (23) is spring-loaded.
The roller D is extruded from the inner bush D ₂ against (23a), and the roller D is assembled to the protrusion shaft C ₁ .

Next, pull down the jig body (8) and the guide shaft (10) to a fixed position, rotate the turntable (2) 90 °, and assemble the outer assembly jig (4) with the outer case E set in advance. The jig main body (13) is moved to the attachment position and raised to a predetermined attachment level. The outer case E is gripped by the collet (15) in a phase in which the roller groove E ₁ is located in the X-axis direction, and the end surface of the outer case E is lifted by the jig body (13) so that each roller assembly unit (6). ) Roller holder (22), the holder (22) of the storage part (2
2a) and the roller groove E ₁ are joined vertically, and thereafter the roller holder (22) is attached to the slide plate (2
The roller D is pushed up together with 1) and the roller D comes out of the storage portion (22a) and is inserted into the roller groove E ₁ .

After the outer case E is mounted as described above, the lower end of the boot B, which has been previously tucked up by the boot mounting unit (7), is moved downward by the clamper (7a) of the unit (7). The outer circumference of the end of the collet (1
5) Open and pull down the jig body (13) to complete the assembly work.

By the way, if the roller D moves or tilts in the X-axis direction on the projection axis C ₁ due to play in the storage portion (22a), the roller D interferes with the case E during the mounting process of the outer case E, and an assembly error occurs. May occur.

Each roller assembly unit (6)
The roller holder (22) was fitted with an engaging member (25) which engages with the roller D and elastically holds the roller D in a predetermined inclined posture.

The roller holder (22) is, as shown in FIGS. 7 to 9,
A pair of long and short claw pieces (22b) (22c) extending inward in the X-axis direction are provided on both sides of the front surface, and a portion surrounded by these claw pieces (22b) (22c) is defined as the storage section (22a). The holder (22) straddles between the arm portions (25a) (25a) on both sides extending above the storage portion (22a) and the tail ends of the both arm portions (25a) (25a). An engaging member (25) having a bridge portion (25b), a tail end portion of each arm portion (25a) is a pin (25c) between tail end portions of the claw pieces (22b) (22c) on each side. The arms (25a) are attached so that each arm (25a) is urged downward by a spring (25d). In this roller holder (22), the roller D is shown in FIG.
It is used when it is the flat roller shown in FIG. 17, and when the roller D is inserted into the storage portion (22a), the first roller
As shown in FIG. 0a and FIG. 11, the tips of both arm parts (25a) (25a) of the engaging member (25) are provided on both sides of the upper edge of the square flange D ₁ a of the bearing inner race D ₁ of the roller D. Are engaged,
Both arms (25a) (25a) are springs centered on the pin (25c).
It swings upwards against (25d), and the swing reaction force pushes the upper edge of the square flange D ₁ a toward the shout A side, and the axis D of the roller D is on the shaft A side with respect to the X axis. It is elastically held in a tilted posture such that it tilts downwardly toward and the tilting of the square flange D ₁ a in the roller rotation direction is prevented.

According to this, the lower edge of the square flange D ₁ a escapes radially outward with respect to the edge portion of the groove wall on the radially inner side of the roller groove E ₁ of the outer case E indicated by a in the figure, and therefore the roller D Even if the position is slightly shifted in the X-axis direction, the roller D is inserted into the roller groove E ₁ without causing interference between the lower edge and the part a as shown in FIG. The posture of D is corrected so as to follow the roller groove E ₁ , and finally the roller holder (22) is pushed up so that the roller D is housed in the roller groove E ₁ as shown in FIG. 10c.

When the roller D is a spherical roller as shown in FIGS. 18 and 19, the roller holder (22) has the arm portions (25a) (25a) on both sides as shown in FIGS. 12 to 14. When the engaging member (25) having the engaging portion (25e) having a wedge-shaped cross section is provided between the ends and the roller D is inserted into the accommodating portion (22a), as shown in FIG. The engaging portion (25e) is engaged with the upper edge portion of the radially inner side surface of the and is pushed up against the spring (25d), and the upper edge portion is moved outward in the X-axis direction by its reaction force. When the roller D is pushed, the roller D is elastically maintained in a tilted posture in the opposite direction to the above, that is, the tilted posture in which the axis O of the roller D is tilted upward toward the shaft A side.

According to this, when the outer case E is raised, the groove wall on the radially outer side of the roller groove E ₁ of the case E is first set to the roller D.
Contacting the outer surface of the roller D, even if the roller D is tilted in the lateral direction,
As the outer case E continues to rise, it is guided by the groove wall to correct the lateral inclination of the roller D, and the roller D resists the pressing force of the engaging member (25) so as to follow the roller groove E _1. The posture of the roller D is corrected, and the peripheral surface of the roller D is prevented from interfering with the end portion of the roller groove E _{1 in} the radial direction indicated by B in the figure, so that the roller D moves to the roller groove E _{1 as} shown in FIG. 15b. It is inserted smoothly.

(Effects of the Invention) As is apparent from the above description, according to the inventions of claims 1 and 2, the outer case is elastically held in a state in which the rollers, which are flat rollers and spherical rollers, are elastically held in predetermined inclined postures. Since the outer case is mounted, interference between the roller and the groove case at the time of mounting the outer case is less likely to occur, and the frequency of assembly errors is reduced. Further, when the roller assembly unit according to claims 3 and 5 is used, The engaging member attached to the roller holder allows the roller to be easily and surely held in the above-described inclined posture, and the efficiency of the assembling work can be improved. Tilt of the square flange of the bearing inner race in the roller rotation direction can be prevented, interference with the outer case due to the tilt of the square flange can be prevented, and assembly errors can occur frequently. It has the effect of further reducing the frequency.

[Brief description of drawings]

FIG. 1 is a plan view of an example of an assembling apparatus used for carrying out the method of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a roller set jig provided in this assembling apparatus. FIG. 4 is a perspective view of the upper end portion of the tool, FIG. 4 is a cutaway side view of a roller assembling unit provided in this assembling apparatus, and FIGS. 5 and 6 are plan and front views of the roller assembling unit, respectively. Is a plan view of a roller holder for a flat roller of the roller assembly unit, FIG. 8 is a front view thereof, FIG. 9 is a side view taken along the line IX-IX of FIG.
FIGS. 10a, 10b and 10c are explanatory views of the operation, and FIG.
a sectional view taken along the line XI-XI in FIG. a, FIG. 12 is a plan view of a roller holder for spherical rollers, FIG. 13 is its front view, and FIG.
XIV-XIV cutaway side view, FIGS. 15a and 15b are explanatory views of its action, FIG. 16 is a plan view of a flat roller type universal joint, FIG. 17 is a cross-sectional view taken along line XVII-XVII of FIG. 18 is a plan view of a spherical roller type universal joint, and FIG. 19 is a sectional view taken along the line IXX-IXX of FIG. A …… Shaft C …… Spider C ₁ …… Projection shaft D …… Roller D ₁ …… Bearing inner race D ₁ a …… Square flange (6) …… Roller assembly unit (20) …… Unit body (22 ) …… Roller holder (22a) …… Storing part (25) …… Engagement member

Claims (5)

[Claims] 1. A roller is attached to each projection shaft on the outer circumference of a spider attached to the end of a shaft, and then the outer case of a roller type universal joint is fitted to each roller groove formed on its inner peripheral surface. A method for assembling a roller type universal joint, which is fitted around a spider in phase so as to be inserted, wherein each roller is a flat roller having a square flange at the end of the bearing inner race near the shaft. In the assembling method, the elastic force is applied to the rollers in a predetermined inclined posture in which the axis of the rollers is slightly inclined in the direction opposite to the mounting direction of the outer case toward the shaft side with respect to the X axis, which is the axis of each projection shaft. A method of assembling a roller type universal joint, characterized in that the outer case is mounted while being held. 2. A roller is attached to each projection shaft on the outer circumference of a spider attached to the end of a shaft, and then the outer case of a roller type universal joint is fitted to each roller groove formed on its inner circumferential surface. A method of assembling a roller type universal joint that is fitted around a spider in phase so as to be inserted. In the method of assembling when each roller is a spherical roller, the axis of each roller is A roller characterized in that the outer case is mounted in a state in which the outer case is elastically held in a predetermined tilted posture toward the shaft side with respect to the X-axis, which is the axis of the projection shaft, in the mounting direction of the outer case. Assembling method of universal joint. 3. A projection shaft can be inserted from the inside in the X-axis direction into a unit main body which can move back and forth in the X-axis direction and which coincides with the axis of the projection shaft on the outer periphery of a spider attached to the end of the shaft. A roller assembly unit in which a roller holder is provided slidably in the shaft axial direction, the roller holder having a storage portion capable of storing the roller to be assembled in the shaft axial direction so that the roller can be inserted and removed freely. In the case of being a flat roller having a square flange at the end of the race close to the shaft, the roller holder is elastically attached to the outer surface portion of the roller type universal joint facing the mounting direction forward of the outer case. Engagement portion that engages and holds the roller in a predetermined tilted posture such that the axis of the roller is inclined toward the shaft side with respect to the X axis in a direction slightly opposite to the outer case mounting direction. Roller assembly unit, characterized in that attached to. 4. The engaging member is configured to be elastically engaged with a tip edge of the square flange of the roller located forward of the outer case mounting direction so as to press the tip edge toward the shaft. The roller assembly unit according to claim 3, wherein. 5. A projection shaft can be inserted from the inside in the X-axis direction into a unit main body which can move back and forth in the X-axis direction and which coincides with the axis of the projection shaft on the outer periphery of a spider attached to the end of the shaft. A roller assembly unit comprising a roller holder provided with a storage portion capable of storing a roller to be assembled in the shaft axial direction so that the roller can be inserted and removed freely in the shaft axial direction, and the roller holder is a spherical roller. In some cases, the roller holder is elastically engaged with an outer surface portion of the roller type universal joint which faces forward in the mounting direction of the outer case of the roller type universal joint so that the axis of the roller is on the shaft side with respect to the X axis. A roller assembling unit, characterized in that an engaging member is provided for holding in a predetermined inclined posture in which the outer case is slightly inclined toward the outer case mounting direction.