JPH04303634A - Assembly apparatus for vibration proof rubber bush - Google Patents

Abstract

PURPOSE:To enable to carry out grease injection to a grease chamber and rubber cap mounting for closing the grease chamber to be conducted mechanically in one process in the case of assembling a grease sealing type vibration proof rubber bush. CONSTITUTION:On a work 49 before injection of grease and mounting of rubber cap 32, an auxiliary jig 68 is set and, in this condition, an injection nozzle is pressed to the auxiliary jig 68 for injecting grease. After the grease thus injected circulates in an inner conduit from one end opening of the auxiliary jig 68, it is discharged into a grease chamber 28. After that, a second fitting part in an outer peripheral part of the rubber cap 32 retained on the outer peripheral of the auxiliary jig 68 is fitted in the shaft end of an intermediate material of the work 49 through the pressing operation of a first cylindrical body 60; subsequently, the second cylindrical body 62 is press-moved by a press- moving plate 80 and then expanded in the diameter through the operation of the tapered surface 78 that serves as a guide surface of the auxiliary jig 68; moreover, it is made to left therefrom so as to be fitted in the shaft end of an inner cylindrical metal piece, thereby closing the grease chamber with the rubber cap 32.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-proof rubber bushing assembly apparatus.

[Prior Art and Problems to be Solved by the Invention] One type of anti-vibration rubber bushing has a structure in which the axially intermediate portion of the outer circumferential surface of the inner cylindrical fitting protrudes in a partially spherical shape, and is disposed on the outside in the radial direction. A partially spherical concave curved surface corresponding to the inner surface of the intermediate member is formed, and the partially spherical convex curved surface and the concave curved surface are slidably fitted, and the first member and the second member are connected within a certain angular range. There is one that allows relative rotation.

[0003] In this anti-vibration rubber bush, in order to prevent foreign matter from entering the mating surface and to ensure smooth sliding on the mating surface, the anti-vibration rubber bush is A grease chamber is formed on the outside to accommodate grease. In addition, an elastic cap is placed over the opening of the grease chamber, with the first small-diameter fitting part on the inner circumference facing the shaft end of the first member, and the second fitting part on the outer circumference facing the middle. Elastic caps are fitted and fixed to the shaft ends of the members to close the opening of the grease chamber.

In the process of assembling this anti-vibration rubber bushing, grease is injected and filled into the grease chamber, and
It is necessary to close the grease chamber by attaching an elastic cap, but in the past, the grease injection process and the elastic cap attachment process were separate processes, and these processes were performed manually by an operator. Ta. That is, first, a certain amount of grease is injected and filled into the grease chamber in one step, and then an elastic cap is attached in another step.

However, if the grease injection process and the elastic cap installation process are separate processes, the number of processes for assembling the anti-vibration rubber bush increases, and each process requires dedicated equipment. Equipment costs also become high.

[0006]

[Means for Solving the Problems] The device of the present invention has been devised to solve the above problems, and its gist is that it includes a cylindrical first member and a device disposed outside the first member. a second member, at least a portion of the inner surface of the second member is fitted to be slidable relative to the outer surface of the first member, and an axially outer side of the fitting surface of the second member is provided. A grease chamber is formed in the grease chamber, and the grease is accommodated in the grease chamber, and the first fitting part has a small diameter on the inner circumferential side, and the second fitting part has a large diameter on the outer circumferential side. A flexible elastic cap is fitted and attached to the axial end side of the first member in the first fitting part, and the second fitting part is fitted to the axial end side of the second member, respectively,
An assembly device for a vibration-proof rubber bushing in which the opening of the grease chamber is closed by the elastic cap is provided.
(b) a support member disposed on the rotary table to support the pre-assembled body before injecting grease and attaching the elastic cap; an injection nozzle for injecting the grease; (d) a grease injection port on one end, a grease circulation passage inside, and the other end for introducing grease from the passage into the grease chamber; Each has a discharge port for discharging, and a first fitting portion of the elastic cap is fitted on the outer circumferential side, and the diameter of the first fitting portion is expanded as the first fitting portion moves relative to each other in the axial direction. an auxiliary jig for injecting grease and attaching an elastic cap, on which a guide surface is formed for detaching at a predetermined position and fitting the first member;
e) a first pressing means for pressing and fitting the second fitting portion on the outer peripheral side of the elastic cap held by the auxiliary jig against the shaft end side of the second member; Pushing the first fitting part on the inner peripheral side of the elastic cap in the axial direction, moving and expanding the diameter along the guide surface of the auxiliary jig, and fitting it to the axial end side of the first member. and a second pressing means.

[Operation and Effects of the Invention] In the apparatus of the present invention, the pre-assembled body (work) before grease injection and attachment of the elastic cap is supported by the support member and moved to a predetermined position by the rotary table. It will be found out.

Then, grease is supplied from the injection nozzle, and the supplied grease flows into the internal passage from the injection port on one end of the auxiliary jig, and further flows through the passage to the other end. It is discharged from the discharge port into the grease chamber of the workpiece.

After or before injecting the grease into the grease chamber, the second fitting portion on the outer circumferential side of the elastic cap previously held on the outer circumferential portion of the auxiliary jig is pressed by the first pressing means and the workpiece is pressed. is fitted onto the shaft end side of the second member.

After the grease is injected, the first fitting portion on the inner circumference side of the elastic cap is pushed along the guide surface on the outer circumference of the auxiliary jig by the second pressing means. At this time, the small-diameter first fitting part of the elastic cap is gradually expanded in diameter by the action of the guide surface, and when it has expanded to a predetermined diameter, it is removed from the auxiliary jig and fitted to the shaft end side of the first member. . At this point, an elastic cap is attached to the workpiece, and the opening of the grease chamber filled with grease is closed.

As described above, in the apparatus of the present invention, the auxiliary jig is equipped with a grease injection port, an internal passage, and a grease discharge port, and functions as a grease injection jig. The elastic cap can be held at the outer periphery during grease injection, and the elastic cap can be attached immediately or concurrently with the grease injection. That is, in this device, green
Injecting the gas and attaching the elastic cap can be performed in the same process.

[0012] This reduces the number of steps for assembling the anti-vibration rubber bushing, improving production efficiency, and also allows the equipment that was required for each of the two processes to be unified, reducing equipment costs. can.

Furthermore, according to the apparatus of the present invention, grease injection and elastic cap attachment can be performed mechanically, making it possible to automate these steps.

[0014]

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 shows an example of an anti-vibration rubber bush, and this anti-vibration rubber bush 10 includes an inner cylinder fitting 12
, an intermediate cylindrical fitting 14 disposed on the radially outer side thereof, an outer cylindrical fitting 16, and a rubber elastic body 18 sandwiched between the intermediate cylindrical fitting 14 and the outer cylindrical fitting 16.

A resin cylinder 20 is fixed to the inner surface of the intermediate cylinder fitting 14. A partially spherical concave curved surface 22 is formed on the inner surface of this resin cylinder 20, and this concave curved surface 22 is
It is fitted in a partially spherical convex curved surface 24 formed on the outer peripheral portion of the axially intermediate portion of the inner cylinder fitting 12 so as to be relatively slidable.

A metal ring 26 having a smaller diameter is arranged at the shaft end of the intermediate cylindrical fitting 14.
6 is fixed to the intermediate cylindrical fitting 14 by caulking the end of the intermediate cylindrical fitting 14. The metal ring 26 prevents the resin tube 20 fixed to the inner surface of the intermediate tube fitting 14 from coming off.

In this example, the inner cylindrical metal fitting 12 constitutes the first member, and the intermediate member 2 includes an intermediate cylindrical metal fitting 14, a resin cylinder 20, and a metal ring 26 disposed at the end thereof.
7 constitutes the second member.

In this anti-vibration rubber bushing 10, a grease chamber 28 is formed on the axially outer side of the fitting surface of the inner cylindrical fitting 12 and the intermediate member 27 in a continuous manner, and is filled with grease 30. There is. And the grease chamber 2
8 is closed with a rubber cap 32.

In the rubber cap 32, a first fitting portion 34 of a small diameter on the inner circumferential side is fitted to the shaft end of the inner cylindrical fitting 12, and a second fitting portion 36 of a large diameter on the outer circumferential side is fitted to the intermediate member 27. It is fitted into the metal ring 26 at.

FIG. 1 shows a device for assembling this vibration-proof rubber bushing 10, particularly a device for injecting grease 30 and attaching a rubber cap 32. In the figure, reference numeral 38 denotes a rotary table, which is connected to a motor 42 via a coupling 40.

A holding hole 44 is formed in the rotary table 38, and a guide cylinder 46 is held in this holding hole 44. A shaft body 48 is fitted into the inner circumferential surface of the guide tube 46 so as to be slidable up and down.

At the upper end of this shaft body 48 is a support member 52 having a pin 50 for supporting a workpiece 49 (a pre-assembled body before injecting grease 30 and attaching rubber cap 32).
is fixed, and this support member 52 is raised together with the shaft body 48 by a push-up cylinder 54.

A slider 56 is provided on the upper side of the rotary table 38. The slider 56 is a horizontal support portion 5
8, and a first cylindrical body 60 as a first pressing means is attached to this support portion 58 in a downwardly fixed position.

A second cylindrical body 62 serving as a second pressing means is fitted into the inner circumferential surface of the first cylindrical body 60 so as to be slidable up and down. The second cylindrical body 62 is urged upward by a spring 64, and is prevented from rising above a certain amount by a stopper 66.

The inner diameter of the second cylindrical body 62 is such that the auxiliary jig 68 can be inserted therein. The auxiliary jig 68 is a substantially cylindrical block-shaped member as shown in FIG. 3, and has an inlet 70 for the grease 30 on the upper end side in the figure and an internal passage 72 through which the grease 30 flows. Further, the lower end side has a discharge port 74 for discharging the grease 30 into the grease chamber 28 of the workpiece 49. Furthermore, the lower end side has a shaft portion 76 that is inserted into the inner cylindrical fitting 12 of the workpiece 49.

On the other hand, a tapered surface 78 is formed on the outer periphery, the diameter of which gradually increases from the top to the bottom in the figure. This tapered surface 78 fits the small-diameter first fitting portion 34 of the rubber cap 32, and this first fitting portion 3
4 when it moves relative downward.

A pushing plate 80 for pushing the second cylindrical body downward is provided above the second cylindrical body 62, and the pushing plate 80 is moved up and down by the cylinder 82. There is.

Furthermore, an injection nozzle 84 for the grease 30 is provided above the push plate 80.
4 can be raised and lowered by a cylinder 86.

Next, the operation of this device will be explained. The workpiece 49 placed on the support member 52 of the rotary table 38 moves to a processing position as the rotary table 38 rotates, with the auxiliary jig 68 set above it as shown in FIG. 4(A). be carried to. Then, the push-up cylinder 54 is activated to push the shaft 48 upward. As a result, the shaft body 48 and the support member fixed to its upper end are raised, and the workpiece 49 is pushed up to a certain position. Then, as shown in FIG. 4(B), the nozzle 84 is moved downward by the cylinder 86, and its tip is inserted into the upper end opening of the auxiliary jig 68 set on the workpiece 49, that is, the grease 30 is injected. Press it against the entrance 70. Next, grease 30 is injected into the interior through this injection port 70. The injected grease 30 flows through the internal passage 72 and is discharged into the grease chamber 28 of the workpiece 49 from the discharge port at the lower end thereof.

At this time, as shown in FIG. 4(A), the rubber cap 32 is covered and held on the outer circumference of the auxiliary jig 68, but at this stage, the rubber cap 32 is
is located away from the workpiece 49, and therefore excess grease 30 overflows from the open portion of the grease chamber 28.

After the grease 30 has been injected, the work 49 is pushed upward together with the auxiliary jig 68 by further pushing up the shaft 48. Then, the auxiliary jig 68
The second fitting part 3 on the outer peripheral side of the rubber cap 32 held in
6 is pressed against the tip of the first cylindrical body 60, and as shown in FIG.
As shown in A), the metal ring 26 on the workpiece 49 is fitted by the pressing action.

Subsequently, the pushing plate 80 is moved to the cylinder 8.
2 to push the second cylindrical body 62 downward. Then, the small-diameter first fitting portion of the rubber cap 32 held by the auxiliary jig 68 is pushed downward by the second cylindrical body 62, and in the process, the tapered surface 78 of the auxiliary jig 68 gradually pushes it downward. After being expanded in diameter, it comes off from the tapered surface 78 at a certain position and is fitted into the shaft end of the inner cylindrical fitting 12 in the workpiece 49 (see FIG. 5(B)). At this point, the attachment of the rubber cap 32 to the workpiece 49 is completed, and the opening of the grease chamber 28 is closed.

When the above operations are completed, the push plate 8
0, shaft body 48 for lifting workpiece 49, push-up cylinder 5
The fourth and other parts return to their original positions and wait to inject grease 30 and attach rubber caps 32 to the next workpiece 49.

When the rotary table 38 rotates and the next workpiece 49 reaches the processing position, the above-described operations are repeated. In this way, the vibration isolating rubber bushings 10 are sequentially assembled mechanically and automatically.

In this example, the second fitting part 36 of the rubber cap 32 is not fitted into the metal ring 26 first, but this is done after the grease 30 has been injected. This is because if the grease 30 is injected after the fitting portion 36 is fitted into the metal ring 26, air will be trapped in the grease chamber 28. That is, the grease 30 is injected in advance to allow air to escape to the outside, and the second fitting portion 36 is fitted to the workpiece 49 in a state where no air remains.

Although the embodiments of the present invention have been described in detail above, this is merely an example, and the present invention can be applied to other forms of anti-vibration rubber bushings without departing from the spirit thereof. It can be configured with various modifications based on the knowledge of those skilled in the art.

[Brief explanation of drawings]

FIG. 1 is a schematic front configuration diagram of a vibration-proof rubber bushing assembly apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an example of a vibration-proof rubber bushing.

FIG. 3 is a diagram showing the configuration of an auxiliary jig in FIG. 1.

FIG. 4 is an explanatory diagram of the operation of the device shown in FIG. 1;

FIG. 5 is an explanatory diagram of the operation of the device shown in FIG. 1;

[Explanation of symbols]

10 Anti-vibration rubber bushing 12 Inner cylinder metal fittings 14 Intermediate tube fitting 20 Resin cylinder 22 Concave curved surface 24 Convex curved surface 26 Metal ring 27 Intermediate member 28 Grease room 30 Grease 32 Rubber cap 34 First fitting part 36 Second fitting part 38 Rotary table 52 Support member 60 First cylindrical body 62 Second cylindrical body 68 Auxiliary jig 70 Inlet 72 Internal passage 74 Discharge port 78 Tapered surface 84 Injection nozzle

Claims (1)

[Claims] Claim 1: A first member having a cylindrical shape and a second member disposed outside the first member, wherein at least a part of the inner surface of the second member is opposite to the outer surface of the first member. They are fitted so that they can slide relative to each other, a grease chamber is formed on the axially outer side of their fitting surfaces, and a small diameter groove is formed on the inner circumferential side. A flexible elastic cap having one fitting portion and a second fitting portion having a large diameter on the outer peripheral side is attached to the shaft end side of the first member in the first fitting portion, and the second fitting portion is attached to the second fitting portion. are respectively fitted and mounted on the shaft end side of the second member, and the opening of the grease chamber is closed by the elastic cap. (b) a support member disposed on the rotary table and supporting the pre-assembled body before grease injection and attachment of the elastic cap;
(c) an injection nozzle for injecting grease into the grease chamber; (d) a grease injection port on one end, a grease circulation passage inside, and a grease injection nozzle on the other end; each having a discharge port for discharging grease from the passage into the grease chamber;
The first fitting part of the elastic cap is fitted to the outer circumferential side, and as the first fitting part moves relative in the axial direction, the diameter of the first fitting part is expanded, and the first fitting part is separated at a predetermined position. (e) an auxiliary jig for injecting grease and attaching the elastic cap, which is formed with a guide surface that fits into one member; (f) a first pressing means for pressing and fitting the fitting portion toward the axial end side of the second member; (f) pushing the first fitting portion on the inner peripheral side of the elastic cap in the axial direction; , a second pressing means that moves along the guide surface of the auxiliary jig and expands its diameter, and then fits onto the shaft end side of the first member. attached device.