JPH09174346A - Pressure fitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable simultaneous pressure fitting-in of a pressure fitting part, C-shaped locating snap ring and oil seal by pressurizing a work downward, and disposing a head for setting and pressure fitting the oil seal in from the upper direction of the outside of a work fitting hole so that it faces a downward pressure fitting-in head. SOLUTION: A C-shaped locating snap ring 41 and bearing 42 are set on a downward pressure fitting-in head 27 and a differential gear case W is set in a placing base 6, while an oil seal 40 is set to an upward pressure fitting-in head 28. With the head 28 descending a bearing 42 is pressure fitted into a fitting hole W3 inside the differential gear case W and the bearing 42 is fitted in a groove W of the C-shaped locating snap 41. Simultaneously, the oil seal temporally retained to an up/down head 29 of an upward pressure fitting-in head 28 lowering and pressing the differential gear case W is pressure fitted in a shaft insertion hole W5 on the outside of the hole W3 in which the bearing 42 is fitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper for preventing a bearing from coming off while press-fitting a bearing or the like into an assembling hole from the inside of a box-shaped member having a bottom such as a differential case in the assembling work of parts. The present invention relates to a press-fitting device capable of simultaneously mounting a wheel and press-fitting an oil seal member.

[0002]

2. Description of the Related Art Conventionally, a bearing, a retaining ring for stopping the bearing, and an oil seal are press-fitted and mounted by press-fitting a press-fitting component such as a bearing into an assembling hole of a work and then manually or by a device. It is necessary to attach the wheel and press fit the oil seal. Therefore, each step requires manual work or work by an apparatus, which requires a lot of man-hours and requires manual work, resulting in poor efficiency.

By the way, Japanese Utility Model Laid-Open No. 62-104826 is disclosed, and this technique simultaneously press-fits a bearing and mounts a retaining ring. In this technology, the press-fit component (bearing) is temporarily held by the holding member with the retaining ring facing it.
The press-fitting punch presses the retaining ring while press-fitting the press-fitting component thereunder into the work-assembly hole, and the press-fitting component is press-fitted and the snap-fitting ring is mounted in the groove formed in the work-assembly hole.

[0004]

By the way, the above-mentioned conventional technique is a technique of press-fitting the press-fitting parts and mounting the retaining ring from the outside of the work. The work has a box shape with a bottom like a differential case. In the case where a bottom portion of the work is provided with an assembly hole for a press-fitting part such as a bearing, it is technically difficult to press-fit the press-fitting part from the outside of the work and mount the retaining ring. Therefore, in the differential case described above, press-fitting of press-fitting parts such as bearings and mounting of the snap ring are preferably performed from the inside of the press-fitting part mounting hole of the work.
With the above-mentioned conventional device or a modification thereof, it is difficult to press-fit the parts from the inside of the assembly hole of the work.

In addition to the above, it is inevitable to install an oil seal on the press-fitted bearing, but in the conventional device, the bearing is press-fitted and the retaining ring is installed from the outside, so the oil seal should be installed simultaneously from this direction. It is difficult to press fit it and it is impossible in practice, so mounting the oil seal is
At present, it is unavoidable to perform it manually or by a separate device.

In view of the above problems of the prior art, the inventor of the present invention
Particularly for work parts such as a differential case, it is preferable to press-fit and mount a press-fitting part and a retaining ring from the inside of the assembling hole, and if possible, an oil seal is press-fitting the press-fitting part,
The present invention has been made in view of the demand that it is convenient if the same device can be used for mounting the retaining ring at the same time.

Therefore, the object of the present invention is to press-fit and assemble a press-fitting part such as a bearing from the inside of the work into an assembling hole provided in the bottom of the work such as a differential case, and together with this, press-fitting part assembly. A stop ring for stop is attached, and press-fitting parts and stop rings can be press-fitted and attached from the inside of the work. Further, this can be surely executed by a simple mechanism. More importantly, while the press-fitting of the press-fitting parts and the mounting of the retaining ring are performed, the oil seal can be simultaneously press-fitted and mounted at the same time. Therefore, it is possible to reduce the man-hours for these operations, that is, press-fitting of press-fitted parts, fitting of a retaining ring, press-fitting of an oil seal, and fitting, and it is possible to perform press-fitting and fitting of each in one step. To provide a press-fitting device capable of efficiently performing press-fitting and mounting.

Further, the object of the present invention is to ensure that the oil seal can be press-fitted and mounted by the pressing mechanism when the parts are press-fitted into the work. For this reason, press fitting parts press fitting,
The mechanism necessary for the retaining ring mounting mechanism can be used to press-fit and mount the oil seal, and the structure of the entire device can be simplified and press-fitting and mounting of a plurality of components can be performed in one step. It is an object of the present invention to provide such a press fitting device.

[0009]

In order to solve the above-mentioned problems, according to the present invention, in claim 1, a work having an assembling hole for a press-fitting component inside is set, and the assembling hole is set downward.
A press-fitting device in which a press-fitting part is press-fitted into the assembling hole from the inside and a C retaining ring is also attached, and the work is placed at a set position by elastically urging the base so as to be movable in the vertical axis direction. A work mounting table and a support table vertically slidably mounted on a column vertically installed on the base table, which is elastically repulsed, and is mounted on the support table and can be expanded and contracted in the radial direction. Outer member,
A lower press-fitting head composed of an inner member arranged inside the outer member and configured to be expandable and contractable in a radial direction; and a cam mechanism for expanding and contracting one of the inner and outer members of the lower press-fitting head,
A press-fitting device, which is disposed so as to face the lower press-fitting head, presses the work downward, and includes an upper press-fitting head that presses and press-fits an oil seal from above and outside the assembly hole of the work.

According to a second aspect of the present invention, between the expansion / contraction members inside and outside the lower press-fitting head, a fixing base for supporting a retaining ring and for supporting press-fitting parts is provided, and the cam for the expanding / contracting outer member. A cam that engages with the mechanism, and the cam of the outer member engages with the cam mechanism to interlock the expanding and contracting outer member with the inner member, and set between the fixing base and the outer member and the inner member. The diameter of the C retaining ring was reduced and the C retaining ring was attached to the assembly hole of the work.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. 1 is a front view in which a main part of a press-fitting device according to the present invention is longitudinally cut, FIG. 2 is a side view in which a main part of the press-fitting device is longitudinally cut, FIG. 3 is an exploded perspective view of a lower press-fitting head, and FIG. 4 is a cam mechanism. Front view, FIG. 5 is a side view of the entire press-fitting device, FIG. 6 is a vertical cross-sectional side view similar to FIG. 2 with the bearing, C retaining ring, and differential case, which are press-fitting parts, set in the press-fitting device, and FIG. 6 is a vertical side view similar to FIG. 6 in a state where the oil seal is being press-fitted to the middle of the inner side assembly hole of the differential case, and FIG. 8 is the press-fitting of the press-fitting parts, the mounting of the C retaining ring, the oil seal FIG. 9 is a view similar to FIG. 7 showing a mounting completed state, and FIG. 9 is an enlarged cross-sectional view of a main part of the upper press-fitting head.

In FIG. 1, reference numeral 1 indicates a press-fitting device, and in the figure, a system of a lower press-fitting head is shown. The horizontal base 2 is provided with convex rails 3a, 3a, the base 4 is horizontally arranged on the base 2, and the base 4 is provided with concave rails 3b, 3b engaging with the convex rails 3a, 3a on the lower surface thereof. The base 4 is configured to be movable via the race mechanism 3 in the front-back direction of the paper surface in FIG. 1, and in the left-right direction of the drawing in FIG.

A column 5 is erected vertically on an intermediate portion of the horizontal base 4 in the left-right direction, and a work placing table 6 is arranged on the base 4 around the column 5 so as to be spaced upward. Set up. The mounting table 6 is provided with an opening 6a in the center for loosely fitting with the support column 5, and a vertical through hole 6b having a spring holder 7 erected on the upper surface is provided at one of the left and right sides. On the other hand, a spring guide rod 8 is erected on the base 4, and the rod 8 passes through the vertical through hole 5b upward, and the vertical through hole 7 is formed on the top portion 7a of the spring holder 7.
Pass b. The rod 8 has a large-diameter head portion 8a and is provided with a vertical through hole 7.
Prevent it from coming out of b. Coil spring 9 around 8 rods
And the spring 9 is the spring holder 7 on the base 4 and the mounting table 6 side.
The mounting table 6 is elastically compressed between the tops 7a of the upper and lower parts 7a.

Guide rods 10 are provided upright on the left and right sides of the base 4, while blocks 11 are placed on the mounting table 6.
a guide cylinder hole 11 including a sleeve 11b,
The guide tube hole 11 is slidably fitted to the guide rod 10 to guide and assure the vertical movement of the mounting table 6. Further, a work positioning pin 12 is provided on the upper surface of the mounting table 6 near the central opening 6a, and the work W, a differential case in the illustrated example, is vertically arranged in the center of the mounting table 6 as shown in FIG. Then, the positioning pin 12 is engaged with the positioning hole W2 on the lower surface of the flange W1 at the lower end to set the position.

The column 5 is set to a height that reaches the intermediate portion in the height direction of the work W in a set state, and an elevating table 13 provided with a vertical through hole 13a in the center of the upper portion of the column 5. Is slidably fitted in the vertical axis direction. The lift 13
As shown in FIG. 3, the lower half portion 13b has a large diameter, the upper half portion 13c has a small diameter, and a shelf portion 13d is provided at the rear portion of the upper half portion 13c.
The shelf 13d is provided with two mounting holes 13e and 13e.

The elevating table 13 is provided with a key groove 13f in a part of the inner diameter portion of the vertical through hole 13a, while a key 14 is provided on the corresponding upper circumference of the support column 5, and the key 14 and the key groove 13f are provided.
And are engaged with each other to ensure vertical sliding along the support column 5 of the elevating table 13. An outer member 15 having a structure that is divided into two is placed on the lift table 13, and the outer member 15 includes symmetrical semicircular outer member halves 15a and 15a.

Supporting portions 15b and 15b are symmetrically projectingly provided at the rear portions of the above half bodies 15a and 15a, and mounting holes 15c and 15c are longitudinally passed through these portions. Through the mounting holes 15c, 15c of the halves 15a, 15a, the bolt-shaped supporting shafts 16, 16 are inserted, and the supporting shafts 16, 16 are vertically installed in the shelf 13d of the lower elevator 13 to provide mounting holes 13e, 13e. Through the bottom of the outer member 15 and tighten the nuts 17 from below,
15a is mounted and supported on the lifting table 13 so as to be expandable and contractible in the radial direction with the support shafts 16 and 16 as fulcrums.

Each of the outer members 15a, 15a is provided with a holding portion 15d having a U-shape in plan view symmetrically at the front end thereof, and a horizontal shaft 18a is provided.
Through the cam rollers 18, 1 to the holding portions 15d, 15d.
8 bearings. Semicircular shelves 15e, 15e are provided in the lower half of the inner diameter of each half 15a, 15a of the outer member so as to surround the circumference of the column 5.

After supporting the lifting platform 13 and the halves 15a, 15a of the outer member 15 which expands and contracts in the radial direction in the horizontal plane, a fixing platform 19 is fixed to the top of the column with bolts 20. The fixed base 19 includes the outer member halves 15a and 15a.
The flange portion 19 that is fitted between the inner diameter portions so as to face the shelves 15e and 15e of a and that faces the shelves 15e and 15e at the lower portion.
a, an upper columnar portion 19b having a smaller diameter than this, and a top portion 19c having a smaller diameter, and mounting grooves 19d and 19e for the C retaining ring are provided in two upper and lower stages on the upper circumference of the columnar portion 19b. Further, the fixing base 19 is provided with a mounting hole 19f extending vertically, and the mounting hole 19f is provided.
The fixing table 19 is fixed to the top of the column 5 by passing the bolt 20 from above.

On the flange portion 19a of the fixing base 19 described above, the inner member 2 having a structure divided into two is provided around the columnar portion 19b.
1, the inner member 21 is provided with symmetrical semi-circular inner member halves 21a, 21a. The inner member half bodies 21a, 21a have an inner diameter portion surrounding the circumference of the columnar portion 19b, and the outer side is surrounded by the inner diameter portion of each half body 15a, 15a of the outer member 15 and faces the shelf portions 15e, 15e.

Between the opposing surfaces 21b, 21b at one end of the inner member halves 21a, 21a, a spring 21c for elastically urging and biasing the opposing surfaces is contracted. A support hole is symmetrically formed in the support hole, both ends of the coil spring are fitted and locked in the support hole, and elastically urged in a direction to expand between the facing surfaces 21b and 21b. The above inner member half body 21
The collars a and 21a face the upper end of the collar 22 and the C retaining ring 23 to regulate the upper side, and the collar 22 and the C retaining ring 23 surround the upper portion of the columnar portion 19b of the fixed base 19 described above. Locked in the mounting grooves 19d and 19e provided in two steps,
The inner half bodies 21a, 21a are prevented from coming off upward.

A cam mechanism 24 as shown in FIG. 4 is vertically installed on the mounting table 6 described above. The cam mechanism 24 includes leg portions 24a, 24 provided with cam surfaces 25, 25 on the inner surfaces facing each other.
a, a stopper portion 24b provided between the tops of the legs. The lower half portions 25a, 25a of the cam surfaces 25, 25 are vertical, and the interval between them is large.
b forms an inclined surface on each inner side, the upper portions 25c, 25c are vertical, and the interval between them is narrow. It is set so that the cam rollers 18, 18 provided at the tip of each of the half bodies 15a, 15a of the outer member 15 face between the cam surfaces 25, 25.

As shown in FIGS. 1 and 2, a coil spring 26 is provided on the circumference of the support column 5 as described above, and the spring 26 is fitted around the base 4 and the support column 5 slidably in the longitudinal direction. It is provided between the lower surfaces of the lifting platform 13. The spring 26 elastically urges and urges the lifting table 13 upward, so that the lifting table 13 has the halves 15a of the outer members 15 placed on the lifting table 13 and the shelves 15e of the outer member 15 located below the fixed table 19. By contacting the lower surface of the flange portion 19a, the upper limit of the rising is regulated. As described above, the upper press-fitting head 27 is configured.

On the other hand, above the lower press-fitting head 27, an upper press-fitting head 28 as shown in FIG. 9 is exposed. FIG. 9 shows an elevating head 29 which constitutes a main part of the press-fitting head 28. The elevating head 29 is an inverted L-shaped base frame 3 as shown in FIG.
As shown in FIG. 9, it is fixed to the lower end portion of the elevating part 32 of the ram 31 which is supported by 0 and is elevated through bolts 33 which are vertically passed from below.

The lifting head 29 described above has a large-diameter upper portion 29.
a and a lower portion 29b having a small diameter are integrally provided. The pressing surface 2 for the work W is provided on the lower surface of the large-diameter upper half portion 29a of the lifting head 29.
9c. A vertical through hole 29e is vertically provided in a central portion of a lower end surface 29d of the lower portion 29b having a small diameter, a bolt 33 is vertically inserted from below, and is screwed to the elevating part 32, and the elevating head 29 is fixed to the elevating part 32.

The inner diameter of the oil seal 40 is fitted on the outer periphery of the lower half 29b of the lifting head 29 to temporarily hold the oil seal 40. An example of the oil seal 40 is shown in FIG. 9, and the oil seal 40 is formed in a ring shape, has a substantially U-shaped cross section downward, and integrally includes a protruding piece 40b outward from the lower end of the inner diameter portion 40a, A spring 40c is mounted on the upper portion of the protruding piece 40b, and an L-shaped core member 40f is embedded in the outer diameter portion 40d and the upper piece 40e. The fitting state of the oil seal 40 to the small diameter lower half portion 29b is as shown in FIG. 9, the inner diameter portion 40a is fitted around the lower half portion 29b, and the upper surface of the upper piece 40e is the lower half pressing surface 2 of the upper half portion 29a.
It contacts the lower surface of the inner diameter portion of 9c.

The entire apparatus will be described with reference to FIG. 5. In the apparatus 1, the base 2 is arranged on the machine base 34, and the upper head 27 of the press-fitting apparatus 1 is arranged in the front half portion of the base 2 to form the base 2.
An L-shaped base frame 30 is erected in the latter half of the above, and the above-described mechanism of the upper press-fitting head 28 is arranged in the base frame 30. Machine stand 34
The upper press-fitting device 1 is surrounded by an enclosure 36 having a wire mesh 35,
A door 37 is provided on the left side of the figure, and the door 38 is opened to set press-fit parts and the like. In FIG. 5, the worker 38 is shown by an imaginary line.

Next, the operations of the press-fitting device 1, the press-fitting parts, the C retaining ring, the oil seal, and the mounting work by the press-fitting device 1 according to the present invention will be described. FIGS. 6 to 8 are diagrams showing the operation over time. In the illustrated example, the work W into which the components are press-fitted is a differential case, and the differential case W is vertically arranged so that the bearing assembly hole W3 faces downward, that is, the inside. However, for this reason, stoppers 6c ... Which restrict the inner side of the lower end flange portion W1 of the differential case W are provided on the base 6. Assembly hole W3
Is provided with a C retaining ring engaging groove W4 axially inward of the inner diameter portion, that is, downward in FIG. 6, and the assembling hole W3 communicates concentrically with the upper shaft inserting hole W5. It has a smaller diameter than the assembling hole W3.

First, the entire lower press-fitting head 27 is wound around the support column 5, and the elastic force of the spring 26 interposed between the base 4 and the lower surface of the elevating table 13 causes it to reach the upper limit position as shown in FIG. is there. Further, the mounting table 6 is elastically urged and urged upward by a spring 9 interposed between the mounting table 6 and the base 4, and is in the upper limit position. At this position, the cam rollers 18, 18 at the tips of the respective halves 15a, 15a of the outer member 15 have the cam mechanism 2 fixed to the mounting table 6.
In the relative positional relationship of No. 4, it is located in the lower order shown by the solid line in FIG.

At this position, as shown in FIG. 4, the cam surface 25,
The cam roller 1 described above between the lower half portions 25a of the 25
8 and 18 are abutted and regulated. Therefore, the cam rollers 18, 18 can be expanded and the outer member 15
Inner member 2 interposed between the inner diameters of the two half bodies 15a, 15a
By the expanding action of the spring 22 of the half body 21a, 21a of 1,
The respective halves 15a, 15a of the outer member 15 are expanded in diameter, and in this state, inside the inner halves of the respective halves 15a, 15a of the outer member 15, the halves 21a, 21a of the inner member 21 are shown on the upper end portions thereof. A C retaining ring 41 similar to the C retaining ring 23 shown in 3 is placed and set. The external shape of the C retaining ring 41 is the same as that of the C retaining ring 23 except that the diameter thereof is the same as that of the C retaining ring 23.

The bearing 42 is vertically placed and set on the C retaining ring 41. The bearing 42 is the outer race 4
The lower surface of 2a faces the C retaining ring 41, and the lower surface of the inner race 42b faces the stepped portion 1 of the upper end of the columnar portion 19b of the fixed base 19.
Place it on 9g, and the inner diameter of the inner race 42b is
Fits around the top 19c of the diameter and attaches to the lower press-fitting head 27 by C
The retaining ring 41 and the bearing 42 are placed and set. Next, the bearing assembly hole W3 of the differential case W is vertically oriented downward so that the press-fitting head 27 faces the hollow portion which is open downward.
The differential case W is placed on the mounting table 6, and the differential case W is
Positioned by the stoppers 6c. This state is shown in FIG.

After that, the upper head 28 facing upward is lowered, and the oil seal 40 is fitted and temporarily held around the small-diameter lower portion 29b of the elevating head 29, which constitutes the main part of the upper head 28. There is. The elevating head 29 is lowered, and the small-diameter lower portion 29b of the elevating head 29 first enters the shaft insertion hole W5 in the upper portion of the differential case W, and the oil seal 40 set around the lower portion 29b also enters the shaft insertion hole W5. To do.

When the lifting head lower portion 29b enters the shaft insertion hole W5 of the differential case W, the oil seal 40 temporarily held around the lower portion 29b is forcibly inserted into the shaft insertion hole W5 of the differential case W. With the further lowering of the lifting head 29,
The work W pressing surface 29c on the lower surface of the large diameter upper portion 29b of the elevating head 29 comes into contact with the upper end W6 of the differential case W, and at this point, the press fitting of the oil seal 40 into the shaft insertion hole W5 is completed.

When the elevating head 29 is further lowered, the differential case W is pushed down against the spring 9, and the bearing 42 set and set on the lower head 27 has the mounting hole W of the differential case W.
3, the upper portion of the bearing 42 enters the assembly hole W3 and is sequentially press-fitted.

The initial state of press-fitting of the bearing 42 is shown in FIG. 7, and the bearing 42 is sequentially press-fitted into the assembling hole W3 of the differential case W when the differential case W is pushed downward, but on the other hand,
The pressing force is also transmitted to the upper head 27 via the bearing 42,
The lift table 13 of the upper head 27 is allowed to slide downward along the support column 5 against the spring 26. In this way, the bearing 42 is gradually pressed into the assembly hole W3 of the differential case W while permitting the downward movement of the lift table 13.

The bearing 42 is left behind on the fixed base 19 of the head 27 by the downward movement of the lower press-fitting head 27, while
The respective halves 15a, 15a of the outer member 15 slide downward due to the action of the spring 26, the bearing 42 leaves the constraint of the upper head 27, and is pressed into the assembly hole W3. In this press-fitting completed state, the upper end portion of the bearing 42 reaches the shoulder portion W6 at the boundary between the assembly hole W3 and the shaft insertion hole W5.

On the other hand, the C retaining ring 41 located below the bearing 42 is inserted into the inside from the lower end of the assembling hole W3. At this time, when the differential case W is lowered, the cam mechanism 2 shown in FIG.
4 also descends, and the cam rollers 18, 18 on the upper head 27 side
Moves relatively upward as shown by the imaginary line in FIG. The cam rollers 18, 18 are arranged in the upper part 2 with a narrow interval from the intermediate part 25b which is symmetrically inclined inside the cam surface 25.
5c, and as a result, the expanded outer member 15 contracts in diameter against the spring 21c of the inner member 21, and the inner and outer members 1
The diameter of the C retaining ring 41 interposed between the Nos. 5 and 21 is reduced.

As a result, the C retaining ring 41 enters the assembly hole W3 of the differential case W in a reduced diameter state, and the upper bearing 42
Faces the groove W4 of the assembling hole W3 immediately below. On the other hand, the upper end surface of the lifting table 13 of the lower head 27 is provided with the mounting hole W3 of the differential case W.
The C retaining ring 41 separates from the restraint of the outer member 15, expands in diameter and elastically engages in the groove W4, and is attached to the groove W4 by coming into contact with the peripheral lower surface W7 and sliding downwardly. It will be. This state is shown in FIG.

In this way, the bearing 41 is press-fitted into the assembly hole W3 inside (downward) of the differential case W, and the bearing 4 is also attached.
The C retaining ring 41, which is the stopper 2 in the thrust direction, is mounted in the groove W4. At the same time, the differential case W
Elevating head 29 of upper press-fitting head 28 for lowering and pressing
Even the oil seal temporarily held in can be press-fitted into the shaft insertion hole W5 on the outer side of the assembling hole W3 for assembling the bearing, and can be mounted. Therefore, the C retaining ring 41 and the bearing 42 are set on the lower press-fitting head 27, the differential case W is set on the mounting table 6, while the oil seal 4 is attached to the upper press-fitting head 28.
0, press fit the bearing 42, press fit the C retaining ring 41,
The oil seal 40 can be mounted at the same time in the mounting process, and these three components can be simultaneously press-fitted and mounted in one process.

Although the present invention has been described in detail with reference to the drawings, the press-fitting parts are not limited to bearings, and the work is not limited to the differential case, and the present invention is not limited to the above examples, and the symmetry of implementation is arbitrary.

[0041]

According to the present invention as described above, the following effects are exhibited. According to claim 1, a work having an assembling hole for a press-fitting part inside is set such that the assembling hole is set downward, the press-fitting part is press-fitted into the assembling hole from the inside, and at the same time, a C retaining ring is attached. A device, which is elastically urged by the base so as to be movable in the vertical direction, and is vertically slidably fitted to a work placing table for placing a work at a set position and a column vertically installed on the base. The pedestal mounted and repelled, the outer member mounted on the pedestal and configured to be expandable / contractible in the radial direction, and the radially expandable / contractible structure disposed inside the outer member A lower press-fitting head composed of an inner member, a cam mechanism that expands and contracts one of the inner and outer members of the lower press-fitting head, and is arranged so as to face the lower press-fitting head, and presses the work downward, Set and press fit the oil seal from above the outside of the work assembly hole. Since it is configured press fitting device and a rectangular press-fitting head, first press-fitting parts such as bearings, and C snap ring, press-fitting the oil seal at the same time, can be mounted.

Therefore, according to the present invention, the upper and lower heads,
And, by setting the press-fitting parts such as bearings, the C retaining ring, and the oil seal on the mounting table, setting the work, lowering the upper press-fitting head and pressing it against the lower head, these bearings, etc. The press-fitting parts, the C retaining ring, and the oil seal can be press-fitted and attached to the work. Therefore, the press-fitting and mounting work of these parts can be done only once, the working efficiency can be remarkably improved, and the work of mounting the oil seal and the mounting device are not required separately, and the working time can be greatly reduced. Significant reduction in component mounting cost can be achieved.

Further, according to the present invention, the press-fitting part and the C retaining ring are set in the lower press-fitting head, the upper press-fitting head temporarily holds the oil seal, and the relative lowering, raising and pressing operations of the upper press-fitting head and the lower press-fitting head are performed. Thus, these parts can be press-fitted and mounted on the work at the same time, and the work can be rationalized, and the operation of the device can be rationalized, so that these parts can be simultaneously press-fitted and mounted. As for the drive mechanism of the device, the lowering mechanism of the upper press-fitting head is enough. In this respect also, the structure of the device is simple, and only one power source is required, and the press-fitting and mounting device for these parts can be easily obtained at low cost. .

Further, according to the present invention, the press-fitting parts such as the bearing and the C retaining ring can be simultaneously press-fitted and mounted from the inside of the work such as the differential case, which has been difficult in the past, and at the same time, the oil seal can be mounted from the outside. Therefore, it is possible to smoothly and surely perform the press-fitting and mounting work in one process of these parts, which has been extremely difficult to receive.

According to a second aspect of the present invention, between the expansion / contraction members inside and outside the lower press-fitting head, there is provided a fixing base for supporting a retaining ring and a press-fitting component, and the expanding / contracting outer member has the cam mechanism. A cam that engages with the cam mechanism of the outer member and the cam mechanism engages the outer member and the inner member that expand and contract, and is set between the fixed base and the outer member and the inner member. Since the C retaining ring is reduced in diameter and mounted in the work assembly hole, the lower retaining ring behaves as a downward press-fitting head to expand the diameter at the same time when the parts are press-fitted by the cam mechanism. It can be smoothly and surely mounted by reducing its diameter, and the C retaining ring mounting mechanism can be configured with a simple mechanism without requiring any driving mechanism for the C retaining ring. .

Therefore, the C retaining ring mounting mechanism which constitutes the main part of the press-fitting head is simplified, and the smoothness and certainty of the mounting operation are ensured, and the C retaining ring mounting mechanism is rational in terms of structure and operation. can do.

[Brief description of the drawings]

FIG. 1 is a front view in which a main part of a press-fitting device according to the present invention is longitudinally cut.

FIG. 2 is a side view in which a main part of the press-fitting device is longitudinally cut.

FIG. 3 is an exploded perspective view of a lower press-fitting head.

FIG. 4 is a front view of a cam mechanism.

FIG. 5 is a side view of the entire press-fitting device.

6 is a vertical cross-sectional side view similar to FIG. 2 in which a bearing, a C retaining ring, and a differential case, which are press-fitting parts, are set in the press-fitting device.

FIG. 7 is a vertical cross-sectional side view similar to FIG. 6, showing a state where the same press-fitting part is press-fitted to the middle of the inner side assembly hole of the differential case and the oil seal is being press-fitted.

FIG. 8 is a view similar to FIG. 7, showing a state in which press-fitting of press-fitted parts, installation of a C retaining ring, and installation of an oil seal are completed.

FIG. 9 is an enlarged sectional view of an essential part of an upper press-fitting head.

[Explanation of symbols]

W ... Work, W3 ... Assembly hole, 1 ... Press-fitting device, 4 ...
Base, 6 ... Mounting stand, 5 ... Support, 13 ... Lifting stand that is a receiving stand, 15 ... Outer member, 21 ... Inner member, 1
8, 24 ... Cam mechanism, 21 ... Fixed base, 27 ... Upper press-fitting head, 28 ... Lower press-fitting head, 40 ... Oil seal, 41 ... C retaining ring, 42 ... Bearing which is a press-fitting part.

Claims (2)

[Claims] 1. A press fit in which a work having an assembling hole for a press-fitting part inside is set with the assembling hole facing downward, the press-fitting part is press-fitted into the assembling hole from the inside, and a C retaining ring is also attached. It is a device that is elastically urged to move in the vertical direction on the base, and is vertically slidably fitted to the work placement table that places the work in the set position and the column vertically installed on the base. Equipped,
And an elastic pedestal, an outer member placed on the pedestal and configured to expand and contract in the radial direction, and an inner member arranged inside the outer member and configured to expand and contract in the radial direction. A lower press-fitting head composed of a member, a cam mechanism that expands or contracts one of the inner and outer members of the lower press-fitting head, and is arranged so as to face the lower press-fitting head and presses the work downward, A press-fitting device comprising: an upper press-fitting head that sets and press-fits an oil seal from outside of the assembly hole. 2. A fixing base for supporting a retaining ring and a press fitting component is provided between expansion / contraction members inside and outside the lower press-fitting head, and the cam member is engaged with the expansion / contraction outer member. C retaining ring set between the fixed base and the outer member and the inner member by interlocking the outer member and the inner member that expand and contract by the engagement of the cam of the outer member and the cam mechanism. The press-fitting device according to claim 1, wherein the diameter of the press-fitting is reduced and the work is attached to the assembling hole of the work.