JPH0533821A - Vibration control device - Google Patents

Abstract

PURPOSE:To improve the fastening accuracy in fastening insulators in a vibration control device used for an engine mount or the like. CONSTITUTION:With insulators 11 to 13 arranged in parallel in such a way that the end faces of inner cylinders 21 to 23 adjoining each other abut on each other, a bolt is penetratingly inserted into the inner cylinders 21 to 23 from the A direction, and a nut is threadedly fitted onto the head of the bolt protruded from the inner cylinder 23 to fasten the inner cylinders. In a vibration control device whose insulators are fastened to each other by the bolt, the inner cylinder 22 has the protrusions 22d and 22e protruded toward the inner cylinders 21 and 23, and the inner cylinders 21 and 23 have the recessed sections 21b and 23b engaged with the protrusions 22d and 22e, and they are constituted in such a way that the widths of the protrusions 22d and 22e and the recessed sections engaged with each other respectively along the peripheral direction of the cylinders become nearly equal to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device, and more particularly to a vibration damping device used for an engine mount of a vehicle.

[0002]

2. Description of the Related Art As a conventional vibration isolator, for example, "J3
The one described on page B-68 of "Introduction of Type 0 car (October 1988, issued by Nissan Motor Co., Ltd.)" is known and is shown in FIG. In FIG. 6, reference numerals 1, 2, 3 denote insulators, and the insulators 1, 2, 3 respectively have inner cylinders 1a, 2a, 3a and rubber members 1b, 2b, 3b vulcanized and bonded to these inner cylinders. There is. The insulators 1, 2, 3 are arranged side by side so that the inner cylinders 1a, 2a, 3a have their axes aligned and the end surfaces of the inner cylinders come into contact with each other, and are fastened by bolts and nuts (not shown).
That is, the bolts are passed through the inner cylinders 1a, 2a, 3a in the direction of arrow H in FIG. 6 so that the head of the bolt contacts the end surface 1c of the inner cylinder 1a and the nut contacts the end surface 3c of the inner cylinder 3a. , The nut is screwed onto the bolt, and is rotated and fastened in the direction of arrow J in FIG. When the vibration damping device having the above-described configuration is used for an engine mount of a vehicle, the rubber members 1b and 3b are used.
Is connected to the vehicle body side member via an outer cylinder (not shown),
Similarly, the rubber member 2b is connected to the engine side member via an outer cylinder (not shown). As a result, two rubber members are arranged in series between the engine and the vehicle body, and such a vibration isolation device has a so-called double vibration isolation structure.

[0003]

However, in such a conventional vibration damping device, the insulator 1,
Since the structure is such that the end faces of the two and three are simply brought into contact with each other and fastened by the bolt and the nut, the insulator 3 is removed when the fastening tool is removed from the nut after fastening the bolt and the nut. Since the twisted portion of the rubber member 3b is released and the inner cylinder 2a of the insulator 2 and the rubber member 2b are twisted through the inner cylinder 3a, there is a problem that the positional accuracy of fastening is lowered.

Therefore, an object of the present invention is to improve the fastening accuracy when fastening the insulators together.

[0005]

In order to solve the above problems, the present invention comprises a plurality of insulators each having a tubular member and an elastic member adhered to the outer peripheral surface of the tubular member,
With the insulators arranged side by side so that the end faces of adjacent tubular members contact each other, insert a bolt from one end side of the insulator in the direction of arrangement to penetrate each inner cylinder, and arrange the insulators in the direction of arrangement. In a vibration isolation device in which insulators are bolt-fastened by screwing and fastening a nut to the tip of a bolt protruding from the tubular member at the other end side of the tubular member, one of the tubular members adjacent to each other Has a convex portion projecting toward the other tubular member, the other tubular member has a concave portion that engages with the convex portion, and the circumferential direction of the inner cylinder of the convex portion and the concave portion that engage with each other It is characterized in that the widths along the lines substantially match.

[0006]

In the present invention, when the insulators are fastened together by the bolts and the nuts, the rotational force is applied from the nut to the tubular member that abuts on the nut. It is regulated by the engagement and twisting between the tubular members is prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 5 are views showing an embodiment of a vibration isolation device according to the present invention. First, the configuration will be described. 1 to 5 in FIG.
1, 12 and 13 are insulators, and insulator 1
Reference numerals 1, 12, and 13 respectively include inner cylinders (cylindrical members) 21, 22, 23, rubber members 31, 32, 33, and outer cylinders 41, 42, 43. The rubber members 31, 32, 33 are vulcanized and bonded to the outer peripheral surfaces of the inner cylinders 21, 22, 23 and the inner peripheral surfaces of the outer cylinders 41, 42, 43, respectively. The insulators 11, 1 are so arranged that the axes of the inner cylinders 11, 12, 13 are aligned and the end surfaces of the adjacent inner cylinders come into contact with each other.
2 and 13 are installed side by side. In this state, bolts (not shown) are attached from one end side in the direction in which the insulators are arranged, that is,
Inserted from the end surface 21a side of the inner cylinder 21 in the direction of arrow A in FIG. 1 so as to penetrate through the inner cylinders 21, 22, 23, and project from the inner cylinder 23 at the other end side in the direction in which the insulators are arranged, that is, the inner cylinder. Insulators 11, 12, 13 are bolted together by screwing a nut (not shown) onto the tip of the bolt projecting from the end face 23a of 23 and rotating and fastening in the direction of arrow B in FIG. .. Therefore, the head of the bolt is the inner cylinder
The nut abuts on the end face 21a of the inner cylinder 21, and the nut abuts on the end face 23a of the inner cylinder 23.

Here, the inner cylinder 22 is composed of an inner cylinder body 22a and a pair of pins 22b and 22c. The pins 22b and 22c are projected from both end surfaces of the inner cylinder body 22a toward the inner cylinders 21 and 23, respectively. Is embedded in the inner cylinder body 22a. This pin 22
The protrusions 22d and 22e of the present application are formed by the protrusions of b and 22c. The inner cylinders 21 and 23 have concave portions that engage with the convex portions 22d and 22e.
21b and 23b are formed. Projections 22d engaging with each other
The widths of the recesses 21b along the circumferential direction of the inner cylinder are substantially the same as shown in FIG. 2, and the widths of the protrusions 22e and the recesses 23b engaging with each other along the circumference of the inner cylinder are the same. To Figure 3
As shown in, they are almost the same.

According to the above-mentioned structure, the adjacent inner cylinders are provided with the convex portions 22d and 22e and the concave portions 21b and 23b which are engaged with each other so that the widths of the inner cylinders in the circumferential direction substantially coincide with each other. Therefore, the relative rotation of the inner cylinders adjacent to each other can be restricted by the engagement between the convex portion and the concave portion. Therefore, when the insulators 11, 12, 13 are bolted together, the torque is applied from the nut to the inner cylinder 23 that comes into contact with the nut,
It is possible to prevent twisting between the respective tubular members due to the engagement of the convex portion and the concave portion, and it is possible to improve the fastening accuracy. Further, by reducing the dimensional tolerance of the convex portions 22d and 22e and the concave portions 21b and 23b, the fastening accuracy can be further improved.

As shown in FIGS. 4 and 5, the rubber member
Punch marks M ₁ and M ₂ are formed on the end faces of 31, 32 and 33 by rubber protrusions. Therefore, the rubber members 31, 3
The positions of 2, 33 in the circumferential direction with respect to the inner cylinders 21, 22, 23 are such that the punch mark M ₁ is located on the center line L ₁ of the recesses 21b, 23b, and the punch mark M ₂ is the pins 22b, 22c. Is positioned so as to be located on the center line L _{2 of the} . Also,
When this embodiment is applied to, for example, an engine mount of a vehicle, the outer cylinders 41 and 43 are connected to a member on the vehicle body side, the outer cylinder 42 is connected to a member on the engine side, and a so-called double vibration isolation structure is configured. It

[0011]

According to the present invention, the relative rotation of the inner cylinders adjacent to each other is restricted by the engagement of the convex portion and the concave portion. Therefore, when the insulators are bolted to each other, a twist is generated between the tubular members. It can be prevented from occurring and the fastening accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a vibration damping device according to the present invention.

FIG. 2 is a sectional view taken along the line XX in FIG.

3 is a sectional view taken along the line YY in FIG.

4 is a front view of the outer insulator in FIG. 1. FIG.

5 is a front view of the central insulator in FIG. 1. FIG.

FIG. 6 is a sectional view of a main part of a conventional vibration isolator.

[Explanation of symbols]

 11, 12, 13 Insulators 21, 22, 23 Inner cylinder (cylindrical member) 22d, 22e Convex portion 21b, 23b Recessed portion

Claims (1)

Claim: What is claimed is: 1. A plurality of insulators having a tubular member and an elastic member adhered to an outer peripheral surface of the tubular member are provided, and end faces of adjacent tubular members abut each other. With the insulators installed side by side, insert the bolt from one end side in the arranging direction of the insulator so as to penetrate each inner cylinder, and project the tip of the bolt from the tubular member at the other end side in the arranging direction of the insulator. In the vibration-damping device in which the insulators are bolted together by screwing and fastening the nuts to the nuts, one of the adjacent tubular members has a convex portion protruding toward the other tubular member. The other cylindrical member has a concave portion that engages with the convex portion, and the widths along the circumferential direction of the inner cylinder of the convex portion and the concave portion that engage with each other are substantially the same. Shaking device.