JPH0351074Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a device for engaging a dust cover with a bump rubber of a shock absorber for an automobile.

[Conventional technology]

Generally, a roughly cylindrical bump rubber made of urethane rubber is fitted onto the upper end of a connecting shaft to the axle of a shock absorber (shock absorber) of an axle of an automobile, motorcycle, etc., and a shock absorber is fitted onto the lower end of the bump rubber. A hard plastic dust cover is attached to surround the shock absorber body to protect the sliding parts of the shock absorber.

The bump rubber and the dust cover have a locking circumferential groove formed on the outer periphery of one end of the bump rubber, and the dust cover has a hollow disk-shaped protrusion that protrudes from one end of the cylinder at right angles inward in the radial direction. They are locked by fitting the two together. That is, when engaging manually, one end of the elastic bump rubber is inserted into the inner circumferential edge of the hollow disc-shaped protrusion of the hard dust cover at an angle, and a part of the inner circumferential edge is aligned with the locking circumferential groove. Then, while rotating, the entire part is gradually pushed into engagement. In addition, some methods have been adopted in which the bump rubber and the dust cover, which are held together, are driven relative to each other in the axial direction, and the bump rubber is simply mechanically pushed into the locking hole of the dust cover.

However, if there is any looseness in the engagement between the bump rubber and the dust cover, the vibrations that occur while the car is running will cause wear on the engagement part, so the groove width of the circumferential groove on the bump rubber should be The thickness is equal to or less than the thickness of the periphery of the stop hole. Therefore, in the conventional method described above, the locking circumferential groove is crushed irregularly due to compression deformation of the bump rubber during engagement and becomes further narrower, so that the locking hole periphery of the dust cover is connected to the locking circumference of the bump rubber. It is extremely difficult to accurately fit into the groove, and there are many cases of poor engagement such as insufficient press-fitting or over-press-fitting, which requires re-press-fitting two or three times, which is extremely inefficient.

[Problem that the invention attempts to solve]

The object of the present invention is to provide an engagement device for a bump rubber and a dust cover that can easily and accurately engage the circumferential groove of the bump rubber with the periphery of the locking hole of the dust cover in a single operation. do.

[Means for solving problems]

The bump rubber and dust cover engagement device of the present invention includes a split drawing die that has a conical hole, the opening on the small diameter side has approximately the same diameter as the locking hole of the dust cover, and is divided into at least two pieces; An opening/closing drive device that opens and closes the split drawing die, and a bump rubber arranged on the large diameter side of the split drawing die, with one end having a locking circumferential groove facing the opening on the large diameter side and with their center lines aligned. a bump rubber support that holds the
a dust cover position guide disposed on the small diameter side of the split drawing die and holding the dust cover in contact with the split drawing die with a locking hole aligned with the opening on the small diameter side; The dust cover is held within the dust cover position guide by a holding jig arranged to press the hollow disc-shaped protrusion of the dust cover from the inside, and a bump rubber held by the bump rubber supporter and the holding jig. The invention is characterized in that it includes a drive device that relatively moves the two in the axial direction.

As shown in FIG. 3, it is preferable that the taper angle of the conical hole 6 with respect to the axial direction of the split drawing die used in the device of the present invention is in the range of 30° to 50°.
Outside this range, the bump rubber 10 cannot be press-fitted using the conical hole 6. Further, a step 7 may be provided at the end of the small diameter side of the conical hole 6, but in that case as well, if the height of the step is 1 mm or more, the bump rubber 10 cannot be press-fitted.

〔Example〕

An embodiment of the device of the present invention will be described with reference to the drawings.

In this device, there are four pillars 2 fixed to the base 1.
A movable plate 3 whose lower side is supported by a spring 4 is supported so as to be movable up and down, and an opening having approximately the same diameter as the large-diameter side opening of the split drawing die 5 is formed in the movable plate 3. A split drawing die 5 having a conical hole 6 on the top and divided into two pieces is held with its large-diameter opening aligned with the opening of the movable plate 3. The taper angle θ of the split drawing die 5 is 40°, and no step is provided at the end on the small diameter side. An opening/closing drive device 8 such as an air cylinder is fixed on the movable plate 3 on the outside of the split drawing die 5 in the opening/closing direction.
It is connected to each split mold.

A bump rubber support 9 is fixed to the base 1 on the lower side of the split drawing die 5, that is, on the large diameter side of the conical hole 6, and has one end portion having a locking circumferential groove 11 in the opening on the large diameter side. The bump rubbers 10 are held facing each other and with their center lines aligned. On the upper side of the split drawing die 5, that is, on the small diameter side of the conical hole 6, a cylindrical dust cover position guide 12, which is divided into two parts like the split drawing die 5, is fixed on each split drawing die 5. , the dust cover 13 is aligned so that the small-diameter side opening of the conical hole 6 and the locking hole 14 of the dust cover 13 (the hole regulated by the inner circumferential edge 15 of the hollow disc-shaped protrusion 20), which is formed to have the same diameter, are aligned. It is designed so that it can be supplied onto a split drawing die 5. The dust cover position guide 12 is not limited to that of this embodiment, and may be a guide of another shape fixed or supported at a different position.

A cylindrical holding jig 16 is supported on the upper side of the split drawing die 5 so as to be movable up and down, and the hollow disc of the dust cover 13 is supplied into the dust cover position guide 12 with the locking hole 14 facing downward. The shaped protrusion 20 can be pressed and held from above. A fixed plate 18 fixed to the top of the support column 2 above the movable plate 3
A driving device 17 such as an air cylinder is fixed to the holder, and is connected to the presser jig 16 by a rod 19.
The holding jig 16 presses and holds the dust cover 13 and at the same time can move it in the axial direction.

[Effect]

The bump rubber support 9 holds the bump rubber 10 with one end having the locking circumferential groove 11 facing upward. On the other hand, the dust cover 13 is supplied into the dust cover position guide 12 with the disk-shaped protrusion 20 facing downward, and the small-diameter opening of the dust cover 13 is aligned with the locking hole 14 on the split drawing die 5 to remove the dust. Place the cover 13. The drive device 17 lowers the holding jig 16 to press and hold the disc-shaped protrusion 20 of the dust cover 13 from above. Since the locking hole 14 of the dust cover 13 is held in line with the opening on the small diameter side of the split drawing die 5 having the same diameter, the inner peripheral edge 15 of the locking hole 14 overlaps the opening end on the small diameter side of the die. become.

When the presser jig 16 is further lowered by the driving device 17, the split drawing die 5 is moved together with the movable plate 3.
descends, and the tip of the bump rubber 10 touches the die 5.
The dust cover 13 is inserted into the locking hole 14 of the dust cover 13 while being deformed by the conical hole 6.

As shown in FIG. 2, the locking circumferential groove 11 of the bump rubber 10 is pushed wide at the end of the small-diameter opening of the split drawing die 5, which overlaps the inner circumferential edge 15 of the dust cover 13, so that the groove width Enlarged locking circumferential groove 11
The inner circumferential edge 15 of the disc-shaped protrusion 20 of the dust cover 13 is securely inserted therein.

Thereafter, when the holding jig 16 is raised by the drive device 17, the movable plate 3 returns to its original position due to the action of the spring 4, and the inner peripheral edge 15 of the protrusion 20 of the dust cover 13
The bump rubber 10 fitted and locked by the split drawing die 5 also leaves the bump rubber support 9 and rises. After the movable plate 3 returns to its original position and stops,
Further raise the presser jig 16 and remove the dust cover 13.
Alternatively, if the bump rubber 10 is held by a take-out device (not shown) and the split drawing die 5 is released from the locking circumferential groove 11 of the bump rubber 10, which has been opened and spread by the opening/closing drive device 8. Since the locking circumferential groove 11 returns to its original state due to the elasticity of the bump rubber 10 itself, the disc-shaped protrusion 20 of the dust cover 13
The inner circumferential edge 15 of the bump rubber 10 is the locking circumferential groove 11 of the bump rubber 10.
is fitted to the bump rubber 10 and dust cover 1.
3 is engaged.

[Effect of idea]

According to the present invention, it is possible to easily and reliably lock the bump rubber and the dust cover, and it is also possible to automate the press-fitting operation.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway sectional view showing an embodiment of the device of the present invention, and Fig. 2 shows a state in which the peripheral edge of the locking hole of the dust cover is inserted into the circumferential locking groove of the bump rubber using the device of the present invention. FIG. 3 is a cross-sectional view of the main part of the drawing die. 5... Split drawing die, 6... Conical hole, 8...
Opening/closing drive device, 9... Bump rubber support, 10
... Bump rubber, 11 ... Peripheral locking groove, 12 ...
Dust cover position guide, 13...Dust cover, 15...Inner peripheral edge, 16...Press jig, 17...
...Drive device, 20... Disc-shaped protrusion.

Claims (1)

[Scope of utility model registration request] A bump rubber made of a roughly cylindrical elastic body having a locking circumferential groove on the outer periphery of one end, and a locking circumference of the bump rubber formed by an inner circumferential edge of a hollow disc-shaped projection protruding radially inward from one end of the cylinder. In an engagement device for a bump rubber and a dust cover, which engages a roughly cylindrical hard dust cover formed to fit into a groove by a locking circumferential groove and an inner circumferential edge of a hollow disc-shaped protrusion; A split drawing die having a conical hole, the opening on the small diameter side being approximately the same diameter as the locking hole of the dust cover, and divided into at least two parts, an opening/closing drive device for opening and closing the split drawing die, A bump rubber support that is disposed on the large diameter side of the drawing die and holds the bump rubber with one end having a locking circumferential groove facing the opening on the large diameter side and aligned with the center line, and a split drawing die. is placed on the small diameter side of
A dust cover position guide that aligns the locking hole with the small diameter side opening and holds the dust cover in contact with the split drawing die, and a hollow disc-shaped protrusion of the dust cover held at the specified position is moved inside. A drive device that relatively moves the bump rubber held by the bump rubber supporter and the dust cover held in the dust cover position guide by the presser jig in the axial direction. An engagement device for the bump rubber and dust cover, comprising: