JP5761513B2 - Strut mount structure - Google Patents

Description

  The present invention relates to a strut mount structure, and more particularly to a mount structure capable of reducing costs.

In vehicles such as automobiles, a suspension device composed of shock absorbers, coil springs, and the like is disposed between the wheel and the vehicle body, and vibrations and impacts from the wheels are attenuated by the action of the shock absorbers and coil springs. So that it absorbs and reduces the input to the car body.
In such a suspension device, the input from the wheel is passed through a bump stopper formed of a coil spring or rubber material or a piston rod of a shock absorber, and then through a strut mount which is a mounting portion of the suspension device to the vehicle body. Is transmitted to. As in Patent Document 1, the strut mount is disposed so as to oppose the core metal member (inner member) to which the piston rod of the shock absorber is fixed, and surrounds the outer periphery of the core metal member from above and below and is fixed to the vehicle body. Damping plate (elastic body) mounted between the upper plate and the lower plate and the upper plate and the lower plate attached to the peripheral edge of the cored bar member It consists of and. A spring sheet that receives the coil spring is provided below the lower plate, and a cup-shaped receiving member that receives the bump stopper is provided below the spring sheet.

  In such a strut mound, relatively large inputs from coil springs and bump stoppers are received by the lower plate (lower hat-shaped member) via the spring seat and the receiving member, respectively. On the other hand, input such as vibration from the piston rod is absorbed by the damping member via the core member and received by the upper plate (upper hat-shaped member). Thus, the structure is such that inputs such as impact and vibration are transmitted to the vehicle body via the upper plate and the lower plate (outer member).

JP-A-7-233845

  As described above, in the strut mount structure of Patent Document 1, a relatively large input from the coil spring and the bump stopper is transmitted to the vehicle body via the lower plate which is a lower hat-shaped member. Therefore, as the input from the coil spring and bump stopper increases, the load applied to the lower plate increases, so the plate thickness of the lower plate is increased, and the shape, material, and structure around the lower plate are devised. It is necessary to improve the strength.

However, complicating the shape of the lower plate and the surrounding structure of the lower plate, and using a high-grade high-grade material for the lower plate leads to an increase in cost and, in some cases, increases the weight. Absent.
The present invention has been made to solve such problems, and an object of the present invention is to provide a strut mount structure capable of simplifying the component configuration and reducing the cost.

In order to achieve the above object, in the strut mount structure according to claim 1, a cored bar member fixed to a tip end portion of a piston rod supported so as to be slidable in an axial direction by a cylinder of a shock absorber; An upper plate disposed on the upper surface side and fixed to the vehicle body side, and an opening having an inner diameter smaller than the outer diameter of the core metal member, and the core rod in a state where the piston rod is inserted through the opening A lower plate disposed on the lower surface side of the member and fixed to the vehicle body side including the core metal member together with the upper plate; a spring seat disposed on the lower surface side of the lower plate and receiving a spring; and the piston The rod can be inserted in a cylindrical shape, and the upper part includes the core metal member and is included between the upper plate and the lower plate, A bump stopper that extends downward along the piston rod so as to protrude downward from the opening of the lower plate and restricts the upward movement of the shock absorber. And the peripheral edge of the opening of the lower plate is formed in a cylindrical shape protruding downward along the bump stopper, the cored bar member is formed of a thin metal plate, and the outer peripheral end of the cored bar member It is formed by bending the portion upward and further bending inward, and the outer peripheral end of the core member is formed by bending upward .

Further, in the strut mount structure according to claim 2, the outer peripheral end portion of the cored bar member bent and formed on the upper side in claim 1 is present in an upper portion of the bump stopper. It is characterized by.
Moreover, in the strut mount structure of claim 3, in claim 1 or 2, wherein the front Kishinkin member bump stopper is bonded by vulcanization, the upper plate is pressurized between the bump stopper and the metal core member It is characterized in that it is vulcanized and bonded to the bump stopper together with the vulcanization bonding.

  In the first aspect of the invention, the upper portion includes the core member and is included between the upper plate and the lower plate, and the lower portion extends downward from the opening of the lower plate along the piston rod. The bump stopper is configured to extend so as to protrude, and by this bump stopper, the upward movement of the cylinder of the shock absorber is regulated, and the input from the shock absorber is transmitted to the vehicle body via the upper plate. It absorbs input such as vibration from the piston rod of the absorber.

  That is, in the present invention, a vibration damping member such as rubber provided between the metal core member at the tip of the piston rod of the shock absorber and the vehicle body, which has been separately arranged in the past, and the movement of the shock absorber cylinder Since the bump stopper that regulates the two parts is integrated and the bump stopper is also used as a damping member, the number of parts of the strut mount structure can be reduced, the structure can be simplified, and the cost can be reduced. it can. In addition, since the input from the cylinder of the shock absorber received by the bump stopper is transmitted from the bump stopper to the vehicle body via the upper plate, the input from the spring transmitted to the vehicle body via the spring seat and the lower plate Can be different paths. In other words, a relatively large input from the bump stopper and the input from the spring are transmitted to the vehicle body through different paths, and the strength of the lower plate and the upper plate can be set to be relatively low. It becomes. Therefore, it is not necessary to increase the plate thickness of these members or use high-strength high-grade members, and the material cost can be suppressed. Furthermore, since the bump stopper is configured to be received by the upper plate, the bump stopper can be disposed at a position close to the vehicle body side (insulator upper side) as a whole. Therefore, when the vehicle body is designed so that the bump stopper position is the same as that of the conventional bump stopper when attached to the vehicle body, the bonnet position of the vehicle can be designed low, and the design of the vehicle can be improved.

Moreover, the peripheral edge of the opening of the lower plate is formed in a cylindrical shape protruding downward, and the deformation of the bump stopper is suppressed by suppressing the deformation in the radial direction due to the bump stopper being compressed by the input from the shock absorber. Since the load direction can be stabilized, the damping characteristic of the bump stopper at the time of design can be obtained with certainty.
In addition, the cored bar member is formed of a thin metal plate, the outer peripheral end of the cored bar member is bent upward and further bent inward, and the outer peripheral end of the cored bar member is bent upward. The outer peripheral end of the cored bar member that is bent upward as in the invention of claim 2 is present in the upper part of the bump stopper, so that the cored bar member and the vibration damping are Ki out to widen the contact area with the upper plate in contact through the member, it is possible to improve the durability of the bump stopper.

In the invention of claim 3 , since the cored bar member, the bump stopper and the upper plate are vulcanized and bonded simultaneously, the manufacturing process can be reduced and the cost can be further reduced.

It is a figure which shows schematic structure of the suspension apparatus to which the strut mount structure concerning this invention is applied. It is an enlarged view of the A section of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a schematic configuration of a suspension device to which the strut mount structure according to the present invention is applied will be described.
FIG. 1 is a diagram showing a schematic configuration of a suspension device to which a strut mount structure according to the present invention is applied. FIG. 2 is an enlarged view of a portion A in FIG.

  As shown in FIG. 1 and FIG. 2, the suspension device 100 is largely composed of a shock absorber 110, a coil spring (spring) 120, a lower spring seat 130, an upper spring seat (spring seat) 140, and a cored bar member 150. The bump stopper 160, the insulator lower (lower plate) 170, and the insulator upper (upper plate) 180.

  The shock absorber 110 includes a cylinder 111 to which vibrations and shocks from the wheel are input and a piston rod 112 that attenuates input to the cylinder 111, and the cylinder 111 and the piston rod 112 are integrated so as to be relatively movable up and down. It is configured. The shock absorber 110 attenuates vibrations and shocks when the vibrations and shocks from the wheels are input to the cylinders 111 and the cylinders 111 move up and down.

  The cylinder 111 is formed in a cylindrical shape with one end closed by a metal and the other end opened. At the end of the closed end of the cylinder 111, a mounting portion 113 for the suspension device of the vehicle is formed. A spring receiving portion 114 that supports the coil spring 120 via a lower spring seat 130 is provided at an intermediate position between one end and the other end of the cylinder 111.

The piston rod 112 has a piston (not shown) that attenuates the input by the cylinder 111 moving up and down by an input from the wheel at one end, and a metal core member attached to the metal core member attachment portion 115 to which the metal core member 150 is attached at the other end. A screw portion 116 for fixing the member 150 with the nut 190 is formed.
The coil spring 120 is a spring formed of a metal in a coil shape. The coil spring 120 absorbs vibration and impact by transmitting the vibration and impact input to the shock absorber 110 and reducing the overall length of the coil spring 120.

The lower spring seat 130 is formed of a rubber material, and is disposed on the spring receiving portion 114 of the cylinder 111 of the shock absorber 110 to support the lower end of the coil spring 120.
The upper spring seat 140 is formed of a rubber material, and is disposed on the lower surface of the outer peripheral portion of an insulator lower 170 described later to support the upper end of the coil spring 120. The upper spring seat 140 is formed so that the coil spring 120 is slidable at the contact portion between the coil spring 120 and the upper spring seat 140 when the shock absorber 110 is operated. Absorbs deformation. Further, the upper spring seat 140 is formed with a bellows-shaped protection portion 141 for protecting the piston rod 112 of the shock absorber 110 from mud or the like.

  The metal core member 150 is a thin metal plate and is formed in a substantially cylindrical shape whose outer peripheral end is bent upward. An insertion hole 151 through which the piston rod 112 is inserted is formed at the center of the cored bar member 150. The outer peripheral end of the cored bar member 150 is further bent inward from the bent upward state to form an insertion hole 152 having an inner diameter into which a nut 190 for fixing the cored bar member 150 to the piston rod 112 can be inserted. ing.

  The bump stopper 160 is formed of an elastic damping member such as a rubber material, and has a substantially conical cylindrical shape whose diameter is reduced toward the lower side. The bump stopper 160 has an upper end abutted against the insulator upper 180, a base portion 161 (an upper portion) included between the insulator upper 180 and the insulator lower 170, and a smaller diameter than the base portion 161. It comprises a stopper part 162 (a part on the lower side) extending from the base part 161 to the lower side than the insulator lower 170. The core 161 is embedded in the base portion 161 of the bump stopper 160 and is vulcanized and bonded to the bump stopper 160. A flat contact portion 163 is formed at the lower end portion of the stopper portion 162 of the bump stopper 160. Further, the central portion of the bump stopper 160 is inserted through the piston rod 112 of the shock absorber 110 through the axial direction so as to reach the cored bar member 150 from the lower end portion (contact portion 163) of the stopper portion 162. A hole 164 and an insertion hole 165 having an inner diameter through which the nut 190 can be inserted so as to reach the cored bar member 150 from the upper end surface of the base portion 161 are formed. The bump stopper 160 absorbs the input by contacting the cylinder 111 and compressing the bump stopper 160 when the cylinder 111 of the shock absorber 110 moves greatly due to an excessive shock input from the wheel.

  The insulator lower 170 has a metal disk shape or a substantially triangular shape and is formed so as to protrude downward as it goes to the center. In addition, an opening 171 having an inner diameter smaller than the outer diameter of the cored bar member 150 is provided at the center of the insulator lower 170 so that the stopper 162 of the bump stopper 160 can be inserted. The periphery of the opening 171 is formed in a cylindrical shape protruding downward along the axial direction of the stopper 162 of the bump stopper 160, and restricts deformation of the bump stopper 160 in the radial direction of the stopper 162. A bump stopper restricting portion 172 is configured. A plurality of studs 191 that fix the insulator lower 170 to the vehicle body 200 via the insulator upper 180 are provided on the outer periphery of the insulator lower 170.

  The insulator upper 180 has a metal disk shape or a substantially triangular shape, and a bump stopper insertion portion 181 that protrudes upward with an inner diameter into which the base portion 161 of the bump stopper 160 can be inserted is formed in the center portion. An insertion hole 182 having an inner diameter into which the nut 190 can be inserted is formed at the center of the bump stopper insertion portion 181. In addition, a plurality of bolt holes 183 through which the implantation bolts 191 are inserted are formed in the outer peripheral portion of the insulator upper 180 so as to correspond to the positions of the implantation bolts 191 provided in the insulator lower 170. The base portion 161 of the bump stopper 160 is vulcanized and bonded to the bump stopper insertion portion 181 of the insulator upper 180 so that the insulator upper 180 and the bump stopper 160 are integrally formed.

  Also, the suspension device 100 constituted by such components is assembled as shown in FIGS. 1 and 2 and fixed to the vehicle body 200. Specifically, the lower spring seat 130, the coil spring 120, the upper spring seat 140, and the insulator lower 170 are placed on the spring receiving portion 114 of the shock absorber 110 in this order from the spring receiving portion 114 side. Then, the end of the protection part 141 of the upper spring seat 140 is put on the outer periphery of the cylinder 111 of the shock absorber 110. Further, the bump stopper 160 to which the insulator upper 180 is vulcanized and bonded is inserted into the insertion hole 164 through the piston rod 112 of the shock absorber 110, while the stopper portion 162 is connected to the bump stopper regulating portion 172 from the opening 171 of the insulator lower 170. Inserted. That is, the bump stopper 160 is in a state where the stopper portion 162 protrudes from the opening 171 (bump stopper regulating portion 172) along the piston rod 112 to the lower side of the insulator lower 170. Next, the implantation bolts 191 provided in the outer peripheral portion of the insulator lower 170 are inserted into the bolt holes 183 formed in the outer peripheral portion of the insulator upper 180 so that the outer peripheral portions are overlapped with each other. At this time, the base portion 161 including the cored bar member 150 of the bump stopper 160 is included between the insulator upper 180 and the insulator lower 170. Then, a nut 190 is screwed into the threaded portion 116 of the piston rod 112, and the shock absorber 110 and the bump stopper 160 are fixed, so that the shock absorber 110, the coil spring 120, and the lower spring constituting the suspension device 100 are fixed. The sheet 130, the upper spring sheet 140, the insulator lower 170, the insulator upper 180, and the bump stopper 160 are assembled together. Then, the stud bolt 191 of the insulator lower 170 is inserted into the vehicle body 200 and the nut 201 is screwed, so that the suspension device 100 is fixed to the vehicle body 200 in an assembled state.

  In the suspension device 100 to which the strut mount structure according to the present invention configured as described above is applied, when vibration and impact are input from the vehicle wheel to the cylinder 111 of the shock absorber 110 in a normal state, the cylinder 111 becomes the bump stopper 160. The coil spring 120 is compressed by moving in the direction of approaching and absorbing inputs such as vibration and impact. Then, the force received by the coil spring 120 is transmitted to the insulator lower 170 through the upper spring seat 140 and is transmitted to the vehicle body 200. Further, the vibration transmitted to the piston rod 112 of the shock absorber 110 is absorbed by the base portion 161 of the bump stopper 160 around the core rod member 150.

  When a large impact that cannot be absorbed by the coil spring 120 is input from the vehicle wheel to the cylinder 111 of the shock absorber 110, the cylinder 111 of the shock absorber 110 compresses the coil spring 120 to absorb the impact. It further moves and abuts against the abutting portion 163 of the stopper portion 162 of the bump stopper 160 and compresses to absorb the impact. Further, the impact input to the bump stopper 160 when the cylinder 111 of the shock absorber 110 abuts is transmitted from the bump stopper 160 to the vehicle body 200 via the insulator upper 180.

Hereinafter, the operation and effect of the suspension device 100 to which the strut mount structure according to the present invention configured as described above is applied will be described.
In the present embodiment, the bump stopper 160 is formed on the peripheral portion of the base portion 161 that includes the core member 150 and is included between the insulator lower 170 and the insulator upper 180, and the opening 171 of the insulator lower 170. And a stopper portion 162 extending so as to protrude downward from the insulator lower 170 from the cylindrical bump stopper restricting portion 172. By the bump stopper 160, the shock absorber 110 moves upward in the cylinder 111. And the input from the shock absorber 110 is transmitted to the vehicle body 200 via the insulator upper 180, and the vibration from the piston rod 112 of the shock absorber 110 is absorbed and transmitted to the vehicle body 200. I try to suppress it. That is, the vibration damping member that absorbs input such as vibration from the piston rod 112 that has been separately arranged in the past and the bump stopper that restricts the movement of the cylinder 111 are integrated, and the vibration damping member is formed by the bump stopper. It is set as the structure which combines. Thereby, the number of parts of the strut mount structure can be reduced, the configuration can be simplified, and the cost can be reduced.

  When a large impact from the vehicle wheel is input, the input from the coil spring 120 is received by the upper spring seat 140 and transmitted to the vehicle body 200 via the insulator lower 170, and further from the cylinder 111 of the shock absorber 110. Is received by the bump stopper 160 and transmitted to the vehicle body 200 via the insulator upper 180.

  That is, since the relatively large input to the bump stopper 160 and the input to the coil spring 120 can be divided into two and transmitted to the vehicle body 200 through different paths, the insulator lower 170 or the insulator upper 180 Inputs are not concentrated on one side, and the strength of the insulator lower 170 and the insulator upper 180 can be set relatively low. Therefore, it is not necessary to increase the thickness of the members or use a high-strength high-grade material for the insulator lower 170 and the insulator upper 180, so that the material cost can be suppressed. Further, by adopting a configuration in which the bump stopper 160 is received by the insulator upper 180, the bump stopper 160 can be disposed at a position close to the vehicle body 200 side (insulator upper 180 side) as a whole. If the vehicle body 200 is designed so as to have the same bump stopper position as the conventional one, the bonnet position of the vehicle can be designed low, and the design of the vehicle can be improved.

  Further, the bump stopper restricting portion 172 of the insulator lower 170 is formed in a cylindrical shape protruding downward, and the deformation in the radial direction due to the compression of the bump stopper 160 by the input from the shock absorber 110 is suppressed. Since the load direction of the bump stopper 160 can be stabilized, the damping characteristic of the bump stopper 160 at the time of design can be obtained with certainty.

  Further, the cored bar member 150 is formed of a thin metal plate, and the outer peripheral end is bent upward, and then is formed into a cylindrical shape bent further inward, and the end of the cored bar member 150 extends from the cylinder to the input direction. The shape does not face the same direction. As a result, the contact area between the cored bar member 150 and the base part 161 of the bump stopper 160 formed of a rubber material can be increased, so that the stress input from the cored bar member 150 to the base part 161 of the bump stopper 160. Can be prevented from concentrating on a part, and the durability of the bump stopper 160 can be improved.

This is the end of the description of the embodiment of the invention, but the invention is not limited to this embodiment.
For example, in the present embodiment, the vulcanization adhesion between the bump stopper 160 and the cored bar member 150 and the vulcanization adhesion between the bump stopper 160 and the insulator upper 180 are individually performed. However, the present invention is not limited to this. Alternatively, both vulcanization adhesion may be performed simultaneously, and by performing vulcanization adhesion at the same time, the manufacturing process can be reduced, so that the cost can be further reduced.

  In this embodiment, the coil spring 120 and the upper spring seat 140 are formed to be relatively slidable at the contact portion between the coil spring 120 and the upper spring seat 140 when the shock absorber 110 is operated. However, the bearing may be disposed between the upper spring seat 140 and the insulator lower 170 so that the upper spring seat 140 and the insulator lower 170 can be relatively slid by the bearing. Similarly to the present embodiment, it is possible to absorb the deformation in the circumferential direction due to the change in the total length of the coil spring 120.

  In addition, the bellows-shaped protective portion 141 for protecting the piston rod 112 is integrally formed on the upper spring seat 140, but the present invention is not limited to this, and each is formed separately. Also good.

100 Suspension device 110 Shock absorber 111 Cylinder 112 Piston rod 120 Coil spring (spring)
140 Upper spring seat (spring seat)
160 Bump stopper 161 Base portion 162 Stopper portion 170 Insulator lower (lower plate)
171 Opening 172 Bump stopper restricting portion 180 Insulator upper (upper plate)
200 body

Claims (3)

A cored bar member fixed to the tip of the piston rod supported slidably in the axial direction by the cylinder of the shock absorber;
An upper plate disposed on the upper surface side of the cored bar member and fixed to the vehicle body side;
The cored bar member has an opening having an inner diameter smaller than the outer diameter of the cored bar member, and is disposed on the lower surface side of the cored bar member in a state where the piston rod is inserted through the opening, and together with the upper plate, the cored bar member A lower plate that is fixed to the vehicle body side,
A spring seat disposed on the lower surface side of the lower plate and receiving a spring;
The piston rod can be inserted into a cylindrical shape, and the upper part includes the cored bar member and is included between the upper plate and the lower plate, and the lower part extends along the piston rod. A bump stopper that extends downward from the opening of the lower plate and regulates the upward movement of the cylinder of the shock absorber , and
The peripheral edge of the opening of the lower plate is formed in a cylindrical shape protruding downward along the bump stopper,
The cored bar member is formed of a thin metal plate, and is formed by bending the outer peripheral end of the cored bar member upward and further bending inward.
A strut mount structure, wherein an outer peripheral end portion of the metal core member is bent upward . 2. The strut mount structure according to claim 1 , wherein an outer peripheral end portion of the cored bar member that is bent upward is present in a portion on an upper side of the bump stopper . The core metal member and the bump stopper are vulcanized and bonded,
3. The strut mount structure according to claim 1, wherein the upper plate is vulcanized and bonded to the bump stopper together with the vulcanization bonding of the core metal member and the bump stopper.

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