JPH0325449Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a shock absorber. The present invention can be used, for example, in a shock absorber that supports an automobile engine together with an engine mount.

[Conventional technology]

The conventional technology will be explained using a buffer device used in a buffer rod as an example.

In other words, in front-wheel drive vehicles with a horizontally mounted automotive engine, the engine mount that supports the engine also bears the torque reaction force of the drive system, so the displacement of the engine mount tends to become large and the durability of the engine mount deteriorates. tends to decline. As one of the measures to solve this problem, as shown in FIG.
A buffer rod 102 has been developed that includes a rod 102a in which both of these rods are connected.

The installation outline of this buffer rod 102 is shown in Section 8.
As shown in the figure. In FIG. 8, 101 is a horizontally placed engine, 102 is a buffer rod, 103 is a bracket on the engine side, and 104 is a bracket on the vehicle body side. The purpose of this buffer rod 102 is to remove the upper part of the engine 101 from the buffer rod 1.
An engine mount 105 that supports the engine 101 by being connected to the vehicle body through the
The objective is to suppress the displacement of the engine mount 105 and improve the durability of the engine mount 105.

Here, one of the buffer rods 102, the buffer device A, has an outer member 200 supported by the bracket 104 on the vehicle body side via the rod 102a and the buffer device B, and a bracket 103 on the engine 101 side by a bolt inserted into the center hole 300a. The inner member 300 is supported by the inner member 300, and an elastic member 400 made of rubber is integrally joined to the outer member 200 and the inner member 300.

This elastic member 400 has two wall-shaped legs 410 extending in the normal direction around the inner member 300.
, an arcuate outer circumferential portion 420 joined to the outer circumferential wall of the inner member 300, and an arcuate inner circumferential portion 430 joined to the inner circumferential wall of the outer member 200.

Here, the engine 101 is C- shown in FIG.
When vibration occurs in the direction of arrow C', the vibration is absorbed by the legs 410 of the elastic member 400. Also, engine 101 is the seventh
When it vibrates in the direction of the D-D' arrow shown in the figure,
The arcuate outer circumferential portion 420 and the arcuate inner circumferential portion 430 are in contact with each other, and vibration is absorbed by their pressing deformation.

By the way, in the shock absorber A of the buffer rod 102, it is generally better for the initial spring constant (in the low load region) to be as small as possible, and it would be ideal if it could be made zero. By setting it to zero, the total spring constant of the engine mount support system can be kept low against engine lateral vibrations during idling. In order to reduce the spring constant, a configuration can be considered in which the inner member 300 and the outer member 200 are separated and independent, and the inner member 300 is supported without a load. However, in such a configuration, since the inner member 300 and the outer member 200 are separated and independent, it becomes difficult to position the inner cylindrical metal fitting 300 and the outer cylindrical metal fitting 200 when installing the shock absorber A, which reduces workability. The mounting accuracy is poor and the mounting accuracy is not satisfactory.

Therefore, the present applicant has recently developed a shock absorbing device that can reduce the initial spring constant and facilitate accurate positioning of the inner and outer members during installation.

This shock absorber, as disclosed in Japanese Utility Model Application No. Sho 58-148342 (Utility Application No. Sho 57-44410), is of a cutting type and consists of an outer cylindrical metal fitting, an inner cylindrical metal fitting, and an elastic member. This elastic member includes an outer elastic part glued to the entire inner circumference of the outer cylindrical metal fitting, an inner elastic part glued to the entire outer periphery of the inner cylindrical metal fitting, and a cut bridge that bridges the inner elastic part and the outer elastic part. It consists of a possible arm. When using this shock absorber, the arms are cut off while the shock absorber is installed between the engine and the vehicle body, and the outer and inner cylinder fittings are separated and independent. As a result, the initial spring constant of the shock absorber can be reduced as described above.

However, in the shock absorber disclosed in Japanese Utility Model Application Publication No. 58-148342, an outer elastic part made of rubber is adhered to the entire inner circumference of the outer cylinder fitting, and an inner elastic part made of rubber is adhered to the entire outer circumference of the inner cylinder fitting. The configuration is as follows. Therefore, when the load applied during use exceeds the initial region, the outer elastic portion made of rubber and the inner elastic portion made of rubber collide and come into sliding contact. Therefore, the rubber constituting the outer elastic portion and the rubber constituting the inner elastic portion frequently collide and slide against each other, which is disadvantageous in terms of improving the durability of the rubber.

[Problem that the invention attempts to solve]

In view of these circumstances, the present applicant has recently developed a shock absorbing device (unknown at the time of filing of this application) that can avoid collisions and sliding contact between rubbers as much as possible.

This shock absorber includes a ring-shaped outer member having a hole defined by an inner circumferential wall with a circular cross section and a locking hole in the circumferential wall, an inner member disposed inside the ring-shaped outer member, and an inner member. an elastic member made of rubber and having a cuttable arm portion fixed to the outer peripheral wall of the member and extending toward the outer member. In this device, most of the inner circumferential wall of the ring-shaped outer member is exposed as a bare metal surface. Then, the distal ends of the arms of the elastic members are locked in the locking holes in the peripheral wall of the outer member, thereby integrally connecting the inner member and the outer member.

In this shock absorber, most of the inner circumferential wall of the metal outer member is exposed as a bare metal surface, thus avoiding collisions and sliding contact between rubber parts, unlike in Japanese Utility Model Application Publication No. 58-148342. The inner member and the outer member are integrally connected by the arm portion, since the arm portion is locked in the locking hole in the peripheral wall of the outer member, and the durability of the rubber can be improved. Workability and installation accuracy can be improved. Also, in this locking type shock absorber, if the arms are cut off as in the device disclosed in Japanese Utility Model Application Publication No. 58-148342, the inner member and outer member become separate and independent, so that the initial spring constant can be adjusted as described above. It has the advantage that it can be made smaller.

However, this is disadvantageous in terms of ensuring the strength of the outer member because it is necessary to form locking holes (acting as notches that are the main cause of strength reduction) corresponding to the number of arms in the peripheral wall of the outer member. It was hot. This is particularly disadvantageous in the case of buffer rod shock absorbers, which are required to ensure the strength of the outer member due to the large impact applied thereto.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to secure the strength of the outer member by eliminating the method of providing locking holes in the peripheral wall, which is the main cause of strength reduction, and to create a brim-shaped seat. By adopting a method in which the part is provided at the tip of the arm part, the contact area between the elastic member and the other peripheral wall is increased, and the ability to hold the outer member and the inner member together can be improved, improving workability and installation accuracy. This is advantageous in terms of It is an object of the present invention to provide a shock absorbing device that can avoid collisions between molecular materials as much as possible and improve the durability of a polymer material that constitutes a cylindrical portion of an elastic member.

[Means for solving problems]

The shock absorber according to the present invention includes an outer member that is supported by one object and has a hole defined by an inner circumferential wall having a circular cross section; an inner member having an outer circumferential wall with a circular cross section; an elastic member made of a polymeric material interposed between the inner circumferential wall of the outer member and the outer circumferential wall of the inner member;
The elastic member is integrally joined to one of the inner circumferential wall of the outer member and the outer circumferential wall of the inner member, and has a predetermined space with respect to the other circumferential wall. a plurality of arm parts that are integrally formed with the cylindrical part and protrude from the cylindrical part toward the other peripheral wall; and a seat formed at the tip of each arm part. The seat is fixed to the other peripheral wall by interposing an adhesive between the seat and the other peripheral wall, and most of the ring-shaped peripheral surface of the other peripheral wall is exposed. , the adhesive area of all the seat parts to the other peripheral wall is smaller than the exposed area of the ring-shaped peripheral surface of the other peripheral wall.

Further explanation will be added below.

The outer member has a hole defined by an inner circumferential wall having a circular cross section. The outer member is therefore typically cylindrical in shape. The outer member is supported by an object. When the shock absorber is a shock absorber used in a buffer rod, one object is a member on the engine side, such as a bracket on the engine side, or a member on the body side, such as a bracket on the body side.

The inner member has an outer circumferential wall with a circular cross section. The inner member is therefore typically cylindrical in shape. The inner member is supported by another object that is a separate member from the first object described above. If the shock absorber is a shock absorber used in a buffer rod, when the first object mentioned above is a member on the engine side, the other object is a member on the body side, and conversely, when the first object mentioned above is a member on the body side, the other object is a member on the body side. When it is a member, the other object is a member on the engine side.

The elastic member is interposed between the inner circumferential wall of the outer member and the outer circumferential wall of the inner member. The elastic member is a polymer material,
Generally made of rubber material. The rubber material is preferably a material with a large vibration absorption effect. The elastic member consists of a cylinder part, an arm part, and a seat part. Here, the cylindrical portion is integrally joined around one of the inner circumferential wall of the outer member and the outer circumferential wall of the inner member. The cylindrical portion is usually provided on the outer peripheral wall of the inner member. The cylindrical portion is preferably made thick in order to improve vibration absorbing properties and the like. The arm portion is integrally formed with the cylindrical portion and protrudes from the cylindrical portion toward the other peripheral wall. Therefore,
When the cylindrical portion is joined to the outer circumferential wall of the inner member, the arm portion protrudes toward the outer circumferential wall of the outer member. Conversely, when the cylindrical portion is joined to the inner circumferential wall of the outer member, the arm portions protrude toward the inner circumferential wall of the inner member. The arms are cuttable. for example,
It can be cut by pulling a part of the arm with fingers or by pressing a jig. Preferably, the arm portion has a notch. This is because the arm portion can be easily cut. The number of arms can be set as appropriate, but 3~
It can be 6 pieces. In this case, it is desirable that a total of four arms be provided in radial and symmetrical positions.

The seat has a brim shape and is located at the tip of the arm.
It has the function of bonding the arm portion to the other peripheral wall with adhesive. The seat preferably has a wide shape in order to increase the adhesive area with the other peripheral wall. Preferably, the seat has a recess that opens to the other peripheral wall. This is because it is easy for the adhesive to flow in from this depression. By forming the depression, the adhesive can flow from the depression between the seat and the other peripheral wall even when the seat is in a compressed state. The shape, depth, and number of the recesses can be appropriately selected as necessary. As the adhesive interposed between the seat portion and the other peripheral wall, an instant adhesive such as an alpha cyanoacrylate adhesive can be used.

[Effect]

In the shock absorbing device of the present invention, the seat is fixed to the other peripheral wall by an adhesive interposed between the collar-shaped seat and the other peripheral wall. Therefore, the outer member and the inner member are integrated through the arm portion and the seat portion, and therefore, when the shock absorber is attached to one object or another object, movement of the outer member and the inner member can be restricted; Positioning of the outer member and the inner member is easy and has good positioning accuracy.

After the shock absorber is attached to one object or another object in this manner, the arm portion of the elastic member is cut with fingers, a jig, or the like. In this case, cut off all the arms.
Note that it is preferable that no residue be left on the cut arm part, and therefore it is preferable that the seat part adhered to the other peripheral wall with an adhesive is also peeled off.
By cutting the arm portions of the elastic member as described above, the outer member and the inner member can be separated and independent from each other while the shock absorber is attached to one object and another object. As a result, the elastic member is in an unloaded state until it comes into contact with the other peripheral wall, so that the initial spring constant can be reduced as in the embodiments described below.

In addition, in the shock absorber of the present invention, most of the ring-shaped peripheral surface of the other peripheral wall facing the cylindrical portion of the elastic member is
Since it is not covered with a polymeric material and is exposed bare, collisions between polymeric materials are avoided as much as possible.

[Effect of idea]

As explained above, in the shock absorber of the present invention, since the seat part is wide, the contact area between the elastic member and the other peripheral wall increases, and an adhesive is interposed between the seat part and the other peripheral wall. Since they are fixed, the ability to keep the other peripheral wall and the arm portion of the elastic member constant is improved.

Therefore, when attaching the shock absorbing device to one object or another object, it is possible to restrict the displacement of the inner member and the outer member, similar to the device shown in Japanese Utility Model Publication No. 58-148342, and therefore the inner member and the outer member can be prevented from shifting. The outer member can be positioned easily and accurately, and workability can be improved.

Therefore, unlike conventional shock absorbers, the shock absorber of the present invention has a locking hole that easily functions as a notch, which is the main cause of strength reduction, when fixing the arm of the elastic member to the other peripheral wall. Since it is not necessary to form it on the outer member or the inner member, this is advantageous in terms of ensuring the strength of the outer member or the inner member.

Furthermore, in the shock absorbing device of the present invention, the other peripheral wall facing the cylindrical portion of the elastic member is exposed bare and is not covered with a polymer material, so that when a load exceeding the initial state is applied. However, collisions between polymer materials can be avoided, and the durability of the polymer materials can be improved.

〔Example〕

An embodiment in which the present invention is applied to a shock absorber for supporting an engine will be described below with reference to FIGS. 1 to 6.

(Structure) The shock absorber of this embodiment corresponds to the shock absorber A shown in FIG. 7, and includes a large cylindrical outer metal fitting 2 as an outer member and a small cylindrical inner tube as an inner member. It is composed of a metal fitting 3 and an elastic member 4 made of rubber that is integrally joined to the outer peripheral wall of the inner cylinder metal fitting 3 and interposed between the outer cylinder metal fitting 2 and the inner cylinder metal fitting 3. Note that the outer cylinder fitting 2 is integrally fixed to one end of the fitting 6 by welding. By inserting a bolt into the hole 60 of this fixture 6, the fixture 6 is attached to the vehicle body side. Therefore, in the shock absorber according to this embodiment, unlike the shock absorber shown in FIG. 7, the outer cylinder fitting 2 is attached to the vehicle body side without intervening the rod 102a and the shock absorber B.

As shown in FIG. 2, the inner cylindrical fitting 3 is longer in the axial direction than the outer cylindrical fitting 2 and the elastic member 4.
0 and 31 protrude beyond the outer cylinder metal fitting 2 and the elastic member 4. As shown in FIGS. 3 and 4, the elastic member 4 includes a thick cylindrical tube portion 41 and a thick tube portion 41.
1 and radially protrudes from the cylindrical portion 41 toward the peripheral wall of the outer cylindrical fitting 2.
2, a seat portion 43 provided at the tip of the arm portion 42,
Consisting of This elastic member 4 is molded together with the inner cylindrical fitting 3 by die vulcanization. Therefore, the inner circumferential surface 41a of the cylindrical portion 41 of the elastic member 4 and the outer circumferential surface 3a of the inner cylindrical fitting 3 are vulcanized and bonded. As is clear from FIG. 3, the arm portion 42 is thick enough to be easily cut with a jig or knife. The seat portion 43 is located at the tip of each arm portion 42 and has a brim shape that is wider than the arm portion 42 . The seat portion 43 is
The inner cylinder fitting 3 has a recessed portion 45 in the axial direction. 1st
As is clear from the figure, the recess 45 opens toward the inner peripheral wall of the outer cylinder fitting 2. Furthermore, the recess 4
5, one end 45a of the inner cylinder fitting 3 in the axial direction is open, as shown in FIG. Note that, as shown in FIG. 1, the proportion of the four seats 43 in the entire circumference of the inner peripheral wall 2a of the outer cylinder fitting 2 is small.

In manufacturing the shock absorber of this example,
The elastic member 4 in the state shown in FIGS. 3 and 4 is press-fitted into the outer cylindrical fitting 2. In the press-fitted state, most of the inner circumferential wall 2a of the outer cylindrical fitting 2 is exposed as shown in FIG. After press-fitting in this manner, an alpha acyanoacrylate adhesive (registered trademark: Aron Alpha, manufactured by Toagosei Co., Ltd.) is interposed between the seat part 43 and the inner peripheral wall 2a of the outer cylindrical fitting 2, thereby sealing the seat part 43. It is integrally fixed to the inner circumferential wall 2a of the outer cylinder fitting 2. As a result, the inner cylindrical metal fitting 3 and the outer cylindrical metal fitting 2 are integrally connected via the arm portion 42 and the seat portion 43. Note that the adhesive is applied by flowing the adhesive from a recess 45 formed in the seat 43.

(Function) The function of the shock absorbing device of this embodiment will be explained together with its usage method. That is, a bolt is inserted into the center hole 30 of the inner cylinder fitting 3, a nut is screwed onto the bolt, and the inner cylinder fitting 3 is attached to the bracket 103 (another object) on the side of the engine 101 shown in FIG. To support. At the same time, the bolt is inserted into the hole 60 of the fixture 6 to fix the fixture 6 to the vehicle body, thereby attaching the outer cylinder fitting 2 to the vehicle body (object 1) via the fixture 6 and the bolt. support. In this supported state, the seat portion 43, which is wider than the arm portion 42, contacts the inner circumferential wall 2a of the outer cylinder fitting 2 to ensure a contact area, and both are integrally bonded with adhesive. As a result, the integrity of the inner cylindrical metal fitting 3 and the outer cylindrical metal fitting 2 is increased, and as shown in FIG.
is located concentrically with the central axis of the outer cylindrical fitting 2.

Next, in this state, the arm portion 42 of the elastic member 4 is cut off using a jig or the like, thereby separating the cylindrical portion 41 of the elastic member 4 and the outer cylindrical metal fitting 2. As a result, the outer cylindrical metal fitting 2 and the inner cylindrical metal fitting 3 become separated and independent from each other.

With the shock absorber installed as described above, as a result of the inner cylinder fitting 3 and the outer cylinder fitting 2 being separated and independent, the outer circumferential surface of the cylinder part 41 of the elastic member 4 is
Until it comes into contact with the inner circumferential surface 2a, there is no load. That is, the distance between the center of the inner cylinder fitting 3 and the center of the outer cylinder fitting 2 is δmm, and the distance between the outer cylinder fitting 2 and the inner cylinder fitting 3 is δmm.
Assuming that the load acting between the Until the surface 2a comes into contact with the surface 2a, that is, when the distance δ is small, the load becomes zero. Therefore, the initial spring constant (low load area) is correspondingly lower. Furthermore, in high load areas such as when suddenly starting or stopping, the cylindrical portion 41 of the elastic member 4 is pressed against the inner circumferential surface 2a of the outer cylindrical fitting 2, so that it has sufficient cushioning properties.

(Effects) In this embodiment, since the brim-shaped seat portion 43 is in contact with the inner peripheral wall 2a of the outer cylinder fitting 2, the contact area between the two increases, and the seat portion 43 and the inner peripheral wall 2a of the outer cylinder fitting 2
A is a structure that is adhesively fixed via an adhesive. Therefore, the ability to maintain the seat portion 43 and the outer cylindrical metal fitting 2 together, and the ability to hold the inner cylindrical metal fitting 3 and the outer cylindrical metal fitting 2 together, is therefore increased. Therefore, when installing the shock absorber of this embodiment between the vehicle body and the engine, the outer cylinder metal fitting 2
and the inner cylinder fitting 3 are connected to the arm portion 42 and the seat portion 4 of the elastic member 4.
3, it is possible to control the displacement of the outer cylinder fitting 2 and the inner cylinder fitting 3 during installation, and therefore the positioning of the outer cylinder fitting 2 and the inner cylinder fitting 3 can be performed with high precision, improving work efficiency. Good. The main reason for this is that when the arm portion 42 is not cut, the outer cylinder metal fitting 2
This is because the relative position of the inner cylinder fitting 3 is fixed via the arm portion 42 and the seat portion 43 having a large contact area unless a special force is applied.

Furthermore, in this embodiment, the inner circumferential wall 2a of the metal outer cylindrical fitting 2, which the cylindrical portion 41 of the elastic member 4 faces, is mostly exposed and is not covered with rubber. Therefore, when a load exceeding the initial state is applied to the shock absorber, the inner circumferential wall 2a of the metal outer cylindrical fitting 2 and the cylindrical portion 41 will collide, resulting in a collision between the metal and the rubber. . Therefore, unlike the device disclosed in Japanese Utility Model Application Publication No. 58-148342, collision and sliding contact between rubber can be avoided, and the durability of the rubber cylindrical portion 41 can be improved.

(Other Embodiments) In the above embodiment, the arm portions 42 of the elastic member 4 have four columnar shapes, but the arm portions are not limited to the columnar shape. Any material may be used as long as the relative position with respect to 3 can be fixed and the material can be cut. Further, the arm portion may be configured so that it can be cut by the strain when a large strain occurs between the engine and the vehicle body, without having to be cut with a knife or the like.

Further, the thickness of the cylindrical portion 41 of the elastic member 4 can be changed as appropriate depending on the purpose of use.

Furthermore, a cylindrical outer tube metal fitting 2 is provided as an outer member.
However, any outer member may be used as long as it has an inner circumferential wall with a circular cross section. Further, although the cylindrical inner tube metal fitting 3 is used as the inner member, any material having an outer circumferential wall with a circular cross section may be used. Further, the circular shape is not limited to a perfect circle, and may be an ellipse or other deformed shape.

[Brief explanation of drawings]

Figures 1 to 6 show one embodiment of the present invention, with Figure 1 being a front view, Figure 2 being a side view, and Figure 3 showing elasticity before the seat is bonded to the outer cylinder metal fitting. FIG. 4 is a front view of the member and the inner cylindrical fitting, FIG. 4 is a sectional view taken along the line -- in FIG. 3, and FIG. 5 is a plan view of the shock absorber shown in FIG. 1. FIG. 6 is a graph showing the relationship between load and distance. FIG. 7 is a cross-sectional view of a buffer rod with a conventional shock absorbing device, and FIG. 8 is a schematic front view showing an example in which the buffer rod is used in an engine. In the figure, 2 is an outer cylindrical metal fitting (outer member), 3 is an inner cylindrical metal fitting (inner member), 4 is an elastic member, 41 is a cylindrical part, 4
2 is an arm portion, 43 is a seat portion, and 45 is a recessed portion.

Claims (1)

[Claims for Utility Model Registration] (1) An outer member that is supported by an object and has a hole defined by an inner circumferential wall with a circular cross section; an inner member having an outer circumferential wall with a circular cross section and an elastic member made of a polymeric material interposed between the inner circumferential wall of the outer member and the outer circumferential wall of the inner member; The member includes: a cylindrical portion that is integrally joined to one of the inner circumferential wall of the outer member and the outer circumferential wall of the inner member and faces the other circumferential wall with a predetermined space therebetween; It is composed of a plurality of cuttable arm parts that are integrally formed with the cylindrical part and protrude from the cylindrical part toward the other peripheral wall, and a seat part formed at the tip of each arm part. , fixing the seat to the other peripheral wall by interposing an adhesive between the seat and the other peripheral wall;
Most of the ring-shaped peripheral surface of the other peripheral wall is exposed, and the adhesive area where all the seats adhere to the other peripheral wall is made smaller than the exposed area of the ring-shaped peripheral surface of the other peripheral wall. A buffer device characterized by: (2) The shock absorbing device according to claim 1, wherein the seat portion has a recess that opens to the other peripheral wall, and the adhesive flows into the recess through the recess. (3) The shock absorbing device according to claim 1, wherein the elastic member is made of a rubber material. (4) The shock absorbing device according to claim 1, wherein the inner member has an elastic member having arms protruding radially on its outer peripheral wall. (5) The shock absorbing device according to claim 1, wherein the arm portion has a notch for cutting the arm portion.