JPH01261526A - Manufacture of engine mount - Google Patents

Abstract

PURPOSE:To securely prevent the axial relative movement of an inner cylinder and an outer cylinder by pressedly fitting the inner cylinder on the inner circumferential surface of the outer cylinder by one reciprocating drive of a press- fitting punch, so that both ends of the inner cylinder can be plastically deformed toward the outer circumferential side to form caulked parts. CONSTITUTION:An engine mount 10 is made up of a cylindrical body 14, an inner cylinder 18, a rubber body 16, and an outer cylinder 20. The inner cylinder 18 is pressedly fitted on the inner circumferential surface of the outer cylinder 20 by one reciprocating drive of a press-fitting punch 26, and further both ends of the inner cylinder 18 are plastically deformed toward the outer circumferential side to form caulked parts 24, 25. At the same time when the press-fitting of the inner cylinder 18 into the outer cylinder 20 has completed, the both end parts of the inner cylinder 18 are caulked to the outer cylinder 10. Thus, the axial both directional relative movement of the inner cylinder 18 and the outer cylinder 20 can be securely prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing an engine mount that is installed between an automobile engine and a vehicle body to support the engine in a vibration-proof manner.

BACKGROUND OF THE INVENTION Conventionally, engine mounts have been used to support an automobile engine on a vehicle body in a vibration-proof manner. As a type of method for manufacturing the engine mount, a first cylindrical member having a mounting bracket to be fixed to one of the engine and the vehicle body is integrally provided on the inner circumferential side via a vibration isolating member.
Engine mounts are manufactured by press-fitting them into the inner peripheral surface of a second cylindrical member that is to be fixed to the other of the engine and the vehicle body. Since various vibration loads are applied to the engine mount from the engine and the vehicle body, not only loads in the radial direction but also loads in the axial direction and the like are applied between the two cylinder members.

Problems to be Solved by the Invention However, since the first cylindrical member and the second cylindrical member are usually fixed only by press fitting, the dimensions of the outer circumferential surface of the first cylindrical member and the inner circumferential surface of the second cylindrical member are Due to tolerances, processing precision, etc., when a relatively large load is applied to the engine mount in the axial direction, slippage may occur between the two cylindrical members, which may impair the axial vibration isolation effect. Ta.

On the other hand, as described in Japanese Utility Model Publication No. 13-9465, for example, when an inner cylinder is fixed to the inner peripheral surface of an outer cylinder by press fitting, the end of the inner cylinder is subjected to plastic processing that opens outward. It is believed that relative movement of the inner cylinder, outer cylinder, etc. in the axial direction can be prevented by applying the following. However, in this case, when performing the above-mentioned plastic working on both ends of the inner cylinder in order to reliably prevent relative movement in both the axial directions of the inner cylinder and the outer cylinder, one of the inner cylinders is usually Since the plastic working of the end portion must be performed in a separate process after the inner cylinder is press-fitted into the outer cylinder, etc., it is inevitable that the number of work steps will increase.

The present invention has been made against the background of the above circumstances, and its purpose is to increase the number of manufacturing steps and to improve the dimensional tolerance and processing accuracy of the first cylindrical member and the second cylindrical member. An object of the present invention is to provide a method for manufacturing an engine mount that can reliably prevent relative movement of both cylindrical members in the axial direction after press-fitting.

Means for Solving the Problems In order to achieve the above object, the present invention provides a first mounting bracket that is integrally provided on the inner circumference side with a vibration isolating member interposed therebetween, and a mounting bracket to be fixed to one of the engine and the vehicle body. A method for manufacturing an engine mount by press-fitting a cylindrical member into the inner peripheral surface of a second cylindrical member to be fixed to the other of the engine and the vehicle body, the method comprising: an upper mold having a first tapered outer circumferential surface that can come into contact with the circumferential edge; and a second tapered outer circumferential surface that can come into contact with the inner circumferential edge of the lower end of the first cylindrical member, and the second cylindrical member (b) preparing a lower die having a positioning portion on the outer circumferential side of the second tapered outer circumferential surface for positioning the second cylindrical member in a direction perpendicular to the axis; (C) placing the first cylindrical member on the upper part of the second cylindrical member placed on the lower mold; d) By bringing the upper mold and the lower mold closer to each other, the upper mold press-fits the first cylindrical member into the inner peripheral surface of the second cylindrical member, and the first tapered outer peripheral surface of the upper mold The second tapered outer peripheral surface of the lower die plastically deforms both ends of the first cylindrical member toward the outer periphery, and the first cylindrical member is moved into the second cylindrical member at the same time as the press-fitting of the first cylindrical member into the second cylindrical member is completed. It is characterized by including press-fitting and caulking steps of caulking the member.

Operation and Effect of the Invention By doing this, the second cylindrical member is placed on the lower mold in a state where it is positioned by the positioning portion on the outer peripheral side of the second tapered outer peripheral surface, and the first cylindrical member is placed on the upper part of the second cylindrical member. After arranging the members, the upper die and the lower die are brought close to each other, so that the first cylindrical member is press-fitted into the inner peripheral surface of the second cylindrical member by the upper mold, and the first tabular outer peripheral surface of the upper mold and Both ends of the first cylindrical member are plastically deformed toward the outer periphery by the second tapered outer circumferential surface of the lower die, and when the press-fitting of the first cylindrical member into the second cylindrical member is completed, the first cylindrical member is transferred to the second cylindrical member.
Since it is caulked to the cylindrical member, it is not necessary to increase the number of manufacturing steps for the engine mount or to increase the dimensional tolerance or processing accuracy of the outer circumferential surface of the first cylindrical member and the inner circumferential surface of the second cylindrical member. Relative movement in the axial direction can be reliably prevented, and the vibration damping effect of the engine mount in the axial direction can be suitably ensured.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings.

In FIGS. 1 and 2, 10 is an engine mount manufactured by the manufacturing method of the present invention. The engine mount 10 includes a cylindrical body 14 and a cylindrical body 1.
4, a rubber body 16 formed into a thick-walled cylindrical shape and integrally fixed between the cylinder body 14 and the inner cylinder 18, and the outer circumference of the inner cylinder 18. It has an outer cylinder 20 fitted to the surface, and the outer cylinder 2
The cylindrical body I4 is fixed to an automobile engine (not shown) via a bracket 12 fixed to the outer peripheral surface of the cylindrical body I4.
By inserting a bolt or the like therein, it is fixed to a bracket of the vehicle body (not shown). Therefore, in this embodiment, the cylinder 14 constitutes a mounting fitting, the rubber body 16 constitutes a vibration isolating member, the inner cylinder 18 constitutes a first cylindrical member, and the outer cylinder 20 constitutes a second cylindrical member. Outer cylinder 2
Tapered surfaces 22.23 whose diameters become larger toward the opening side are formed on the inner peripheral surfaces of both end edges of the inner cylinder 18, and tapered surfaces 22.23 are formed on both ends of the inner cylinder 18 along the tapered surfaces 22.23. Caulked portions 24 and 25 that open toward the outer circumference are provided, respectively, and these caulked portions 24 and 25 prevent relative movement of the inner cylinder 18 with respect to the outer cylinder 20 in both axial directions.

The engine mount 10 described above was manufactured as follows.

First, for example, by vulcanizing and molding the rubber body 16 within the annular space of the cylinder body 14 and the inner cylinder 18 which are arranged concentrically with each other, the cylinder body 14° rubber body 16. While the inner tube 18 is joined to each other, the outer tube 20 is roll-formed from a plate material, and then the bracket 12 is fixed to the joint portion by welding. Next, the inner cylinder 18, on which the cylinder body 14 is integrally provided via the rubber body 16, is press-fitted and tightened onto the inner circumferential surface of the outer cylinder 20 as shown in FIG.

In FIG. 3, 26 is a press-fitting punch, and 28 is a die, and the press-fitting punch 26 is brought close to and separated from the die 28 by a drive device (not shown). The press-fitting punch 26 has the tapered surface 22 of the outer cylinder 20.
A truncated cone-shaped convex portion 34 is provided, which has a shape corresponding to the above and has a tapered outer circumferential surface 30 that can come into contact with the inner circumferential edge of the upper end of the inner cylinder 18. On the other hand, the die 28 has a truncated conical convex portion having a shape corresponding to the tapered surface 23 of the outer cylinder 20 and having a tapered outer peripheral surface 32 that can come into contact with the inner peripheral edge of the lower end of the inner cylinder 18. 36, and an annular and bottomed positioning hole 37 in which the lower end of the outer cylinder 20 is placed in a fitted state to position the outer cylinder 20 in a direction perpendicular to the axis is provided on the Taber outer peripheral surface 32. It is formed on the outer peripheral side of. Therefore, in this embodiment, the press-fitting punch 26 is placed in the upper mold, the die 28 is placed in the lower mold,
The Taber outer circumferential surface 30 corresponds to a first Taber outer circumferential surface, the Taber outer circumferential surface 32 corresponds to a second Taber outer circumferential surface, and the positioning hole 37 corresponds to a positioning portion.

First, the outer cylinder 20 is fitted and placed in the positioning hole 37 of the die 28. At this time, an annular space slightly larger than the wall thickness of the inner cylinder 18 is formed between the tapered surface 23 of the outer cylinder 20 and the tapered outer peripheral surface 32 of the convex portion 36 .

Next, after positioning the inner cylinder 18 on the upper part of the outer cylinder 20, as shown in FIG. Press fit into the surrounding surface. When the press-fitting punch 26 is further lowered after the inner peripheral edge of the lower end of the inner cylinder 18 comes into contact with the tapered outer peripheral surface 32 of the die 28, as shown in FIG. 3(b), the upper end of the inner cylinder 18 One of the caulked portions 24 is formed by plastically deforming the press-fitting punch 26 toward the outer circumferential side along the tapered outer circumferential surface 30 . Then, from this state, the press-fitting punch 26
When the is lowered and approached the die 28, as shown in Fig. 3 (C).
As shown in FIG. 2, the inner tube 18 is press-fitted into the outer tube 20 and its lower end is plastically deformed toward the outer circumferential side along the tapered outer circumferential surface 32 of the die 28 to form the other caulked portion 25. As a result, the inner cylinder 18 is crimped onto the outer cylinder 20 at the same time that the press-fitting of the inner cylinder 18 into the outer cylinder 20 is completed. Note that if the force required for press-fitting the inner cylinder 18 is larger than the force required for plastic working of the end, the upper end of the inner cylinder 18 is pressed along the tapered outer circumferential surface 30 before press-fitting into the outer cylinder 20. The caulked portion 24 is formed by expanding, and then the inner cylinder 18 is press-fitted into the outer cylinder 20, and finally the lower end of the inner cylinder 18 is connected to the tapered outer circumferential surface 32.
The caulked portion 25 is formed by being expanded along.

According to this embodiment, the inner cylinder 18 is press-fitted into the inner peripheral surface of the outer cylinder 20 by one reciprocating drive of the press-fitting punch 26, and both ends of the inner cylinder 18 are plastically deformed toward the outer peripheral side. The caulking portions 24 and 25 are formed, and the inner tube 18 is caulked to the outer tube 20 at both ends at the same time as the press-fitting of the inner tube 18 into the outer tube 20 is completed.
In both the axial directions of the inner cylinder 18 and the outer cylinder 20, without increasing the manufacturing man-hours and cost or increasing the dimensional tolerance and processing accuracy of the diameter of the outer peripheral surface of the inner cylinder 18 and the inner peripheral surface of the outer cylinder 20. The relative movement of the engine mount 10 is reliably prevented, and the vibration damping effect in the axial direction of the engine mount 10 is suitably ensured.

In the above embodiment, the end portion of the inner tube 18 is configured to be plastically deformed toward the outer circumference over the entire circumference, but only the circumferentially negative portion of the end portion of the inner tube 18 is deformed toward the outer circumference. It may be plastically deformed to . For example, the inner cylinder 18 is relatively press-fitted into the outer cylinder 20 using a press-fitting punch 38 and a caulking punch 40 as shown in FIG. By crimping partially toward the outer circumferential side in the direction, the inner cylinder can be crimped to the outer cylinder at the same time as the press-fitting of the inner cylinder 18 into the outer cylinder 20 is completed, as in the case of the previous embodiment.

In this embodiment, the press-fitting punch 38 and the caulking punch 40 constitute an upper mold. In this case, the outer cylinder 20
If a tapered notch is provided only in the portion of the inner circumferential surface of the upper end edge of the inner tube 18 corresponding to the portion to be caulked by the caulking punch 40, the notch and the caulked portion of the inner tube 18 can be engaged. Therefore, relative movement of the inner cylinder 18 and the outer cylinder 20 not only in the axial direction but also in the circumferential direction is prevented, and an effective vibration damping effect can always be obtained regardless of the direction in which the vibration load is applied. Note that if the force required for caulking is larger than the force required for press-fitting, press-fitting and caulking may be performed together using only the caulking punch 40, as in the case shown in FIG. can.

Although the embodiments of the present invention have been described above based on the drawings, the present invention may be implemented in other embodiments as well.

For example, the manufacturing apparatus described in each of the above embodiments, such as the press-fit punch 26 and the die 28, or the press-fit punch 3
8 and the caulking punch 40 are merely examples of devices for suitably implementing the engine mount manufacturing method of the present invention, and it is of course possible to manufacture the engine mount using other devices.

Further, in the above-mentioned embodiment, the outer cylinder 20 is fixed to the engine side and the cylinder body 14 is fixed to the vehicle body side, but these may be fixed in opposite directions without any inconvenience.

Further, in the above-mentioned embodiment, the cylinder 14 is used as the mounting fitting, but it is also possible to use a bolt, a bolt, or the like.

In addition, the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an engine mount manufactured by the method shown in FIG. 3. FIG. 2 is an enlarged longitudinal sectional view of the engine mount shown in FIG. 1. FIG. 3 is a diagram for explaining an example of the method for manufacturing an engine mount of the present invention. FIG. 4 is a diagram for explaining another example of the manufacturing method of the present invention, and is a diagram showing an upper mold. 10: Engine mount 14: Cylindrical body (mounting metal fittings) 16: Rubber body (vibration isolating member) 18: Inner cylinder (first cylindrical member) 20: Outer cylinder (second cylindrical member) 26: Press-fit punch (upper die) 28 : Die (lower die) 30: Tapered outer circumferential surface (first tapered outer circumferential surface) 32: Tapered outer circumferential surface (second taper outer circumferential surface) 37: Positioning hole (positioning part) 38: Press-fit punch (upper die) 40: Caulking punch (Upper mold) Applicant Hosei Brake Industry Co., Ltd. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A first cylindrical member, in which a mounting bracket to be fixed to one of the engine and the vehicle body is integrally provided on the inner circumferential side via a vibration isolating member, is fixed to the other of the engine and the vehicle body. A method of manufacturing an engine mount by press-fitting the engine mount into an inner circumferential surface of a second cylindrical member, the engine mount having a first tapered outer circumferential surface that can come into contact with the inner circumferential edge of the upper end of the first cylindrical member. a mold, and a positioning part that has a second tapered outer peripheral surface that can come into contact with the inner peripheral edge of the lower end of the first cylindrical member and that positions the second cylindrical member in a direction perpendicular to the axis. a step of preparing a lower mold having an outer circumferential side of a tapered outer circumferential surface; and a step of placing the second cylindrical member on the lower mold in a state in which the second cylindrical member is positioned on an outer circumferential side of the second tapered outer circumferential surface by the positioning section. , arranging the first cylindrical member on top of the second cylindrical member placed on the lower mold, and bringing the upper mold and the lower mold closer to each other so that the upper mold can cause the first cylinder to The member is press-fitted into the inner peripheral surface of the second cylindrical member, and both ends of the first cylindrical member are plastically moved toward the outer peripheral side by the first tapered outer peripheral surface of the upper mold and the second tapered outer peripheral surface of the lower mold. An engine mount characterized by comprising a press-fitting and caulking step of deforming the first cylindrical member and caulking the first cylindrical member to the second cylindrical member at the same time as the press-fitting of the first cylindrical member to the second cylindrical member is completed. Production method.