JPS63203920A - Assembling device for bearing in universal joint - Google Patents

Abstract

PURPOSE:To improve the accuracy of assembling by providing an advancing end regulating mechanism for a press-fitting rod independently from a press-fit cylinder and fixing the press-fitting rod according to the dispersion of sizes. CONSTITUTION:An advancing position regulating mechanism 40 which regulates the advancing position of a bearing press-fitting rod 39 is provided behind a press-fitting cylinder 30. A bearing 7 is press-fitted into the shaft of a spider 4 when pressurized fluid is supplied to the press-fitting cylinder 30, because the bearing press-fitting rod 39 and a piston rod 31 are formed in one body. Then, the cylinder 41 of the advancing position regulating mechanism 40 works to advance a wedge 42 between the piston rod 31 and a frame 43. The press- fitting rod can thus be fixed according to the dispersion of the sizes of the spider, thereby the accuracy of assembling is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a device for attaching to a forked arm a bearing that rotatably supports a cross-shaped spider placed between the forked arms.

2. Description of the Related Art For example, as a joint for a propeller shaft in a vehicle such as an automobile, a universal joint is generally used in which a cross-shaped spider is rotatably attached to the bifurcated arm of a yoke.

In this type of universal joint, a bearing such as a roller bearing is press-fitted onto the spider's shaft in the mounting hole formed in the bifurcated arm, and the spider is held rotatably by the bearing, and a part of the mounting hole is caulked. The bearing is fixed.

When attaching the bearing to the forked arm, the spider must be located exactly in the center of the forked arm, so that there is no gap between the spider's shaft end and the inner surface of the bearing. This is necessary, and since the bifurcated arm is essentially a cantilever beam and is easily bent, the bifurcated arm is expanded outward to swage the press-fitting hole of the bearing.

FIG. 5 shows an assembly device for a Cardan joint described in Japanese Patent Publication No. 44-16841, in which the bifurcated arm 2 of the yoke 1,
3, and insert the shaft into the mounting holes 5 and 6 of the forked arms 2 and 3. Then, insert the bearing 7 into the mounting hole 5 from the outside of the forked arm 2 using the press-fitting device 8. When pushing in with the plunger 9, the tip of the clamp 10, one end of which is connected to the press-fitting device 8, is hooked onto the forked arm 2. In this state, pressure is applied by the press-fitting device 8 so that the bearing 7 comes into contact with the shaft end of the spider 4, and when the bearing 7 is further press-fitted, the press-fitting device 8 is retreated to the stopper 11 by the reaction force, and the forked arm The structure is such that the amount of preload on the shaft of the spider 4 is set by bending the spider 4 by a predetermined amount.

Furthermore, conventionally, as shown in FIGS. 6 and 7, the bifurcated arm 2,
3, the means for expanding the bearing 7, and the forked arm 2,
A device is used which is provided with three separate means for caulking. That is, the means of expansion is to hook a pair of hooks 12 onto the tips of the bifurcated arms 2 and 3, and a pair of tl! ! 14 is press-fitted with a predetermined pressure, and at that time the wedge 1
The forked arms 2 and 3 are pushed apart by the action of 4.

The means for press-fitting and caulking has a structure similar to a telescopic cylinder, in which the piston rod 16 of the large-diameter caulking cylinder 15 has a hollow structure, and a cylindrical caulking tool 17 is attached to its protruding end. A small-diameter press-fitting cylinder 18 is provided inside the piston rod 16, and the piston rod 19 is made to protrude both forward and backward. A stopper 20 is attached to the rear end, and the tip is used to pressurize the bearing 7. It has a structure in which it protrudes from the caulking tool 17. In this device, the crimping cylinder 15 is in a free state and the press-fitting cylinder 1 is
8 by supplying pressure fluid to each piston rod 1
6 and 19 are moved forward, and the bearing 7 is pushed into the mounting hole 5 of the bifurcated arm 2 with the tip of the piston rod 19 of the press-fitting cylinder 18. The depth of the press-fit is determined by the stopper 20 coming into contact with the end surface of the caulking cylinder 15. Next, when pressure fluid is supplied into the large-diameter caulking cylinder 15, the caulking tool 17 moves forward together with the piston rod 16, caulking the mounting hole 5 and fixing the bearing 7.

Problems to be Solved by the Invention However, in the conventional device shown in FIG. 5, the press-fitting of the bearing 7 and the expansion of the bifurcated arms 2 and 3 are carried out by a single press-fitting device 8, which simplifies the device. However, it is difficult to adjust the pressing force and pressure, and if there are variations in the dimensions of the axis of the spider 4 from the reference axis, the assembly accuracy will be greatly affected. There was a problem.

In addition, in the conventional device shown in FIGS. 6 and 7, when the bifurcated arms 2 and 3 are expanded, the distance between the two arms 2 and 3 is determined by the press-fitting pressure of the model 14, which tends to cause variations in the distance between the expansions. In the distribution of the shaft in the spider 4 to the left and right, there is a problem in that it is not possible to expand the shaft in accordance with the variation in dimensions. Furthermore, a press-fitting cylinder 15 and a caulking cylinder 18
Since these are not completely independent, when caulking the mounting hole 5, a load is applied to the press-fitting piston rod 19, which causes the position of the spider 4 to fluctuate, which in turn adversely affects the assembly accuracy. There were problems that arose.

The present invention was made against the background of the above-mentioned circumstances, and it is an object of the present invention to provide an apparatus that can assemble bearings with high precision.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention inserts a bearing from the outside of the bifurcated arms into a mounting hole formed in the bifurcated arms facing each other in order to insert the cross-shaped spider shaft. In a bearing assembly device for a universal joint in which the bearing is press-fitted and the bearing is fixed by crimping the outer edge of the mounting hole, a pair of hooks that engage the distal end of the bifurcated arm from the inside, and a pair of hooks of these hooks are used. Providing an expanding device including a pair of wedges inserted between the wedges and contacting each of the hooks, and a pressing mechanism that individually pushes each of the wedges by a predetermined distance from the state in which they are in contact with the hooks, and a press-fitting cylinder equipped with a hollow piston rod that moves back and forth along its axis toward the mounting hole on the outside of the bifurcated arm, a forward position regulating mechanism that regulates the forward end of the piston rod, and the piston rod. A caulking cylinder formed inside the body and having a piston rod protruding toward the distal end side, the piston rod of the caulking cylinder being passed through so as to move relatively back and forth along its axis, and fixed to the piston rod of the press-fitting cylinder. A press-fit caulking device consisting of a bearing press-fitting rod, and a caulking tool attached to the tip of the piston rod of the caulking cylinder to caulk the mounting hole of the bifurcated arm on the outer circumferential side of the bearing press-fitting rod. It is characterized by having the following.

Function: With the cross-shaped spider in the desired position, the forked arms are expanded by pushing the wedge between the hooks. In that case, each branch is individually moved forward by a predetermined distance, so the amount of expansion of the left and right bifurcated arms is set individually.In other words, the bifurcated arms expand regardless of the left and right extension of the axis in the spider. be done. The bearing is temporarily attached to the forked arm by supplying pressure fluid to the press-fitting cylinder. That is, when pressure fluid is supplied to the press-fitting cylinder, the piston rod moves forward, and its forward end is held by the forward position regulating mechanism, so that the bearing is press-fitted to a specified size. Then, when pressure fluid is supplied to the caulking cylinder, the piston rod moves forward, and a caulking tool attached to the tip of the piston rod caulks the mounting hole in the forked arm to fix the bearing.

In that case, the bearing is press-fitted into the piston rod of the press-fitting cylinder by a bearing press-fitting rod whose forward position is regulated by the forward position regulating mechanism, and the caulking work is carried out inside the piston rod of the press-fitting cylinder. Therefore, the loads for press-fitting the bearing and for caulking do not affect each other.

Example Next, embodiments of the invention will be described with reference to the drawings.

Figures 1 to 4 show one embodiment of the present invention. First, the press-fit caulking device will be explained. As shown in Figure 1, this device has a structure similar to a parent-child cylinder, and is used for press-fitting. Piston rod 3 in cylinder 30
A caulking cylinder 32 is formed inside the body 1 . That is, the press-fitting cylinder 30 has its center axis aligned with the forked arm 2.
, 3 is fixed to a predetermined machine base (not shown) so as to be located on an extension line of the mounting hole in 3, and a hollow piston rod 31 is movable back and forth inside the cylinder tube 33 and protrudes both forward and backward. It is set up like this. This piston rod 31 is sealed by a rear head 34 and a front head 35, and thus serves as a cylinder tube of a caulking cylinder 32, in which a piston 36 is housed.

The piston rod 3 integrated into the piston 36
7 is a hollow body that penetrates the front head 35 and projects toward the bifurcated arms 2 and 3, and has a caulking tool 38 attached to its tip.

The bearing press-fit rod 39 is attached to the center of the inner surface of the rear head 34 of the press-fit cylinder 30, and passes through the piston 36 and piston rod 37 of the caulking cylinder 32 and the caulking tool 38 along their axes. It protrudes from the tip side of 38.

A forward position regulating mechanism 40 that defines the forward position of the piston rod 31 in the press-fitting cylinder 30, that is, the forward position of the bearing press-fitting rod 39, is arranged on the rear side of the press-fitting cylinder 30. This mechanism 40 is configured to insert a side 42 between a base 43 and a piston rod 31 of the press-fitting cylinder 30 by means of a cylinder 41.

Next, the expansion device 44 will be explained.
As shown in FIGS. 2 to 4, there are a pair of hooks 45, 46 that are hooked onto the tips of the forked arms 2 and 3, and a pair of wedges 47, 46 that convert forward force into spreading force. 48 and each school 47
. The hook 45.46 is
As shown in FIG. 4, they are each attached to a predetermined machine frame 53 via four-link parallel movement mechanisms 51 and 52 so as to move in parallel in the direction in which the forked arms 2 and 3 are expanded. A pair of &247.48 are for contacting the inner wall surfaces of the hooks 45 and 46 to press the hooks 45.46, and extend forward from the mounting base 54 so as to be located between the hooks 45.46. The guides 55 are located on both sides of the guide 55. As shown in FIGS. 2 and 3, each of the presses 47 and 48 is connected to pressing machines 49 and 50 fixed to a mounting base 54, respectively. As shown in a cross-sectional view in FIG. 3, each of the pressing mechanisms 49, 50 has a plunger 57, which is movable back and forth, with patterns 47 and 48 connected to the distal end side of a cylindrical holder 56 built therein. A pole nut 58 is attached to the rear end of the holder 56, and a motor 5 is attached to the rear end of the holder 56.
9 is attached thereto, and a ball screw 60 which is screwed into the pole nut 58 is connected to the rotating shaft via a coupling 61. And this pressing mechanism 49°5
0 is configured to advance 147, 48 by a predetermined dimension after the stems 47, 48 contact the inner wall surfaces of the hooks 45, 46.

Note that the reference symbol @62 in FIG. 1 indicates cam teeth protruding from the inner surfaces of the rear head 34 and the front head 35, and the reference symbol 63 indicates the piston 36 of the caulking cylinder 32 so as to mesh with the cam teeth 62. These cams m62 and pins 63 are provided slightly offset in the circumferential direction, and as the piston 36 moves back and forth, the pins 63 mesh with the cam teeth 62. , the piston 36, that is, the caulking tool 38, is rotated by a constant angle.

The operation of the apparatus constructed as above will be explained next. With the yoke 1 to which the bearing 7 is temporarily attached set in a predetermined position, the hooks 45 and 46 are connected to the forked arms 2 and 3.
is engaged from its inner side.

In that case, a guide 55 is positioned between each hook 45, 46, and each rod 47, 48 is first advanced by a presser @49.degree. 50 until it contacts the inner wall surface of the hook 45, 46. In addition, model 47.48 is hook 45.
46 is the expansion start state, and this state can be detected by, for example, an earth switch or the like. Thereafter, the motor 59 of each pressing mechanism 49,50 rotates based on the given information, thereby pressing each model 47.
．． 48 moves forward along with plunger 57 by a predetermined distance. As a result, the eight wedges 47 and 48 are connected to the guide 55.
Hook 45.46 with two forked arms 2゜3 as a backup.
and expand it. In that case, since the eight wedges 47 and 48 are individually advanced by the corresponding pressing mechanisms 49 and 50, the amount of expansion of each of the forked arms 2 and 3 depends on their thickness and the axis of the spider 4. The amount of expansion can be set regardless of the length. When a pressure fluid such as air is then supplied to the press-fitting cylinder 30, the piston rod 31 moves forward toward the forked arm 2 in the right direction in FIG. Since the bearing press-fitting rod 39 is integrated with the piston rod 31, the bearing 7 temporarily attached to the forked arms 2 and 3 is attached to the spider 4.
is press-fitted onto the shaft. Thereafter, the cylinder 41 of the forward position regulating mechanism 40 disposed on the rear end side of the press-fitting cylinder 30 operates to move the wedge 42 forward between the piston rod 31 and the machine frame 43, and as a result, the press-fitting cylinder 30 When the forward position of the piston rod 31 is defined, pressure fluid is supplied to the caulking cylinder 32, and as a result, the caulking tool 38 moves forward together with the piston 37, and the forked arms 2, 3 move forward together with the piston 37.
The bearing 7 is fixed by partially caulking the mounting hole.

As described in detail, according to the present invention, the forward end regulating mechanism for regulating the forward end of the piston rod of the press-fitting cylinder, that is, the forward end of the press-fitting rod, is provided independently of the press-fitting cylinder. The press-fit rod can be fixed depending on the variation in the In addition, since the expansion is set by the forward movement value of the model, it is easy to adjust the amount of expansion of the bifurcated arm, and the expansion can be done according to the inner dimensions of the bifurcated arm and the wall thickness of the bifurcated arm. Since the amount of expansion of the left and right sides of the bifurcated arms can be made equal, the accuracy of distribution is improved. Overall, according to this invention, a universal joint with good product precision can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a portion of a press-fit crimping device in an embodiment of the present invention, Fig. 2 is a plan view showing the expansion mechanism, Fig. 3 is a sectional view thereof, and Fig. 4 is a partial view showing the hook. , 5th
The figure is a schematic sectional view showing an example of a conventional device, and FIGS. 6 and 7 are schematic sectional views showing other conventional devices. 30... Cylinder for press fitting, 31... Piston rod, 32... Cylinder for caulking, 37... Piston rod, 38... Caulking tool, 39... Rod for press fitting bearing, 40... Forward position regulation mechanism, 44.
...expanding device, 45.46...hook, 47.4
8... Tree, 49.50... Pressing mechanism. Applicant Toyota Motor Corporation Koyo Machinery Co., Ltd.

Claims (1)

[Claims] A bearing is press-fitted from the outside of the forked arms into a mounting hole formed in two forked arms facing each other in order to insert the cross-shaped spider shaft, and the outer edge of the mounting hole is further caulked to receive the bearing. A bearing assembling device for a universal joint for fixing a universal joint includes: a pair of hooks that engage the distal ends of the bifurcated arms from the inside, and a pair of wedges that are inserted between these hooks and contact each hook, respectively. and a pressing mechanism for individually pushing each of the wedges by a predetermined distance from a state in which they are in contact with the hook; A press-fitting cylinder provided with a hollow piston rod that moves back and forth, a forward position regulating mechanism that regulates the forward end of the piston rod, and a caulking cylinder that is formed inside the piston rod and from which the piston rod protrudes toward the distal end. and a bearing press-fitting rod that passes through the piston rod of the caulking cylinder so as to move back and forth relatively along its axis and is fixed to the piston rod of the press-fitting cylinder, and A bearing assembly device for a universal joint, comprising a press-fit caulking device comprising a caulking tool attached to the tip of the piston rod of the caulking cylinder for caulking the attachment hole of the bifurcated arm.