JP2010286099A - Mount - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mount capable of sufficiently permitting the precession motion and axial displacement of a shock absorber while sufficiently suppressing horizontal displacement. <P>SOLUTION: The mount for connecting the shock absorber D mounted between a vehicle body B and an axle to the vehicle body includes vibration control rubber 1 connected to the vehicle body B, and a rotation and rock allowing means 2 mounted between the vibration control rubber 1 and the shock absorber D for permitting the rotation and rocking of the shock absorber D relative to the vibration control rubber 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an improved mount for connecting a shock absorber to a vehicle body.

  This type of mount is used to connect the upper end of the shock absorber piston rod to the vehicle body. For example, when the shock absorber is set as a strut type and used as a support column for supporting the wheel, the wheel is also connected by a lower arm swingably attached to the vehicle body. The shock absorber expands and contracts in response to the swinging. At that time, a change in the inclination of the shock absorber with respect to the vehicle body occurs, torque acts on the shock absorber, and the shock absorber exhibits a miso soup (precession) motion. In particular, when used for front wheels, the wheel is steered and the movement becomes remarkable. Therefore, the mount is made of anti-vibration rubber and anti-vibration so as to allow the movement and absorb the tilt change and torque. Some include a ball bearing interposed between rubber and a shock absorber (see, for example, Patent Document 1).

  In this mount, the ball bearing allows rotation of the shock absorber relative to the vehicle body, and by allowing the shock absorber to change the inclination of the shock absorber by bending the anti-vibration rubber, the shock absorber's miso-rubbing motion is allowed, and the shock absorber piston While avoiding the input of a large bending force to the rod or cylinder, it prevents the generation of a large frictional force between the cylinder and the piston or between the piston rod and the packing that seals the outer periphery of the piston rod, Unnecessary friction can be prevented at the same time due to relative rotation between the piston rod and the cylinder.

JP 2007-196982 A

  As described above, the conventional mount is designed to absorb the change in the inclination of the shock absorber with the vibration isolating rubber, and the quality of this absorption greatly affects the riding comfort in the vehicle. As far as durability permits, it is desirable for rubber to have as low rigidity as possible with respect to the above-mentioned inclination change. The shock absorber and the vehicle body may interfere with each other because the displacement in the direction becomes too large, and if the rigidity of the anti-vibration rubber is set higher than the axial displacement of the shock absorber, the vibration insulation performance will deteriorate. Since there is a possibility that the riding comfort in the vehicle may be impaired, low rigidity is required for the axial displacement and inclination change of the shock absorber, but relatively high rigidity is required for the lateral displacement of the shock absorber, On the one hand, for multiple movements Stiffness characteristics contradictory and high rigidity is required in the other.

  The shape of the anti-vibration rubber has been devised to satisfy the above-mentioned contradictory characteristics, but there is a limit to making both compatible at a high level, and it becomes low rigidity against axial displacement and tilt change In order to realize the characteristics, the volume of the anti-vibration rubber is increased and the mount is enlarged, and if the volume of the anti-vibration rubber is reduced in favor of this, the rigidity against the axial displacement and the inclination change is increased and the shock absorber is increased. There is a dilemma that the friction of each part increases and the ride quality deteriorates.

  In particular, when considering application to a shock absorber that generates a damping force with the torque of a motor as disclosed in JP 2008-95800 A or JP 2008-202738 A, the diameter of the anti-vibration rubber Since the size of the mount is remarkably large, the increase in the size of the anti-vibration rubber increases the rigidity against lateral displacement and change in tilt, and the large lateral force acts on the screw shaft and ball screw nut, resulting in smoothness. There is a risk that expansion and contraction may be hindered.

  Therefore, the present invention was devised to improve the above-mentioned problems, and the object of the present invention is to sufficiently allow for miso-scrubbing movement and axial displacement of the shock absorber and lateral displacement. It is to provide a mount that can be sufficiently suppressed.

  In order to achieve the above-described object, the problem-solving means of the present invention includes a vibration isolating rubber coupled to the vehicle body and a vibration isolating rubber in a mount that couples a shock absorber interposed between the vehicle body and the axle to the vehicle body. Rotation / oscillation allowing means that is interposed between the damper and the shock absorber and allows the shock absorber to rotate and swing with respect to the anti-vibration rubber.

  According to the mount of the present invention, the anti-vibration rubber is required to have high rigidity with respect to lateral displacement in the radial direction and low rigidity with respect to the axial direction, and low rigidity with respect to oscillation. In addition, since the demand for the anti-vibration rubber can be made lower than the conventional level, the design of the anti-vibration rubber can be afforded, and the volume of the anti-vibration rubber does not need to be secured, so that the increase of the anti-vibration rubber can be avoided.

  Since the required level of anti-vibration rubber is reduced in this way, both low rigidity with respect to axial displacement and high rigidity with respect to the lateral direction can be achieved at the same time. By cooperating with the permitting means, it is possible to sufficiently allow miso-scrubbing movement and axial displacement of the shock absorber and sufficiently suppress lateral displacement.

  In addition, since it is possible to set the lateral rigidity of the anti-vibration rubber high, the shock absorber does not interfere with the vehicle body, and further, the miso-scrubbing motion of the shock absorber is sufficiently allowed. Therefore, the excessive bending force is prevented from acting on the vehicle, and the friction at each part is increased so that the riding comfort of the vehicle is not deteriorated.

It is a longitudinal cross-sectional view of the shock absorber to which the mount in one embodiment is applied. It is an enlarged view of the mount part of the buffer which applied the mount in one modification of one embodiment.

  The present invention will be described below based on the embodiments shown in the drawings. As shown in FIG. 1, the mount M in one embodiment is interposed between an anti-vibration rubber 1 connected to a vehicle body B, and the anti-vibration rubber 1 and the shock absorber D. A shock absorber D that is configured to include a self-aligning bearing 2 as a rotation and swing allowance means that allows rotation and swing relative to the vibration isolating rubber 1 and is interposed between the vehicle body B and an unillustrated axle. Is connected to the vehicle body B.

  On the other hand, the shock absorber D connected to the vehicle body B by the mount M is, as shown, a direct acting actuator A driven by the motor 3 and a fluid pressure damper connected to the lower end of the actuator A. H, and a suspension spring S interposed between the actuator A and the fluid pressure damper H. The mount M grips the outer periphery of the actuator A and connects the actuator A to the vehicle body B, and the lower end of the fluid pressure damper H is connected to an axle not shown. That is, the shock absorber D is interposed between the vehicle body B and the axle of the vehicle, with the actuator A positioned upward and the fluid pressure damper H positioned downward. The upper end of the suspension spring S is supported by an upper suspension spring receiver 12 fixed to the outer periphery of the motor 3, and the lower end of the suspension spring S is supported by a lower suspension spring receiver 13 provided on the outer periphery of the fluid pressure damper H. It is supported.

  Specifically, the actuator A includes a ball screw nut 4 held by the rotor 3 a of the motor 3 and a screw shaft 5 that is screwed to the ball screw nut 4. The screw shaft 5 is connected to the motor 3 so as not to rotate. 1 is allowed to move only in the vertical direction in FIG. Therefore, by rotating the ball screw nut 4 with the motor 3, the screw shaft 5 can be driven in the vertical direction in FIG. The screw shaft 5 may be connected to the rotor 3a of the motor 3 so that it can be rotated, and the ball screw nut 4 may be driven in the vertical direction in FIG.

  The fluid pressure damper H exhibits a predetermined damping force when the rod 7 is expanded and contracted with respect to the cylinder 6 and is provided mainly for the purpose of absorbing high-frequency vibrations. The working fluid in the fluid pressure damper H may be a gas other than a liquid such as hydraulic oil, water, or an aqueous solution.

  The fluid pressure damper H is connected in series to an actuator A that has a large moment of inertia and does not easily expand and contract with respect to the input of high-frequency vibration, and easily transmits vibration. This vibration energy is absorbed in response to vibration input. The coil springs 8 and 9 mounted on the outer periphery of the fluid pressure damper H are slidably inserted into the cylinder 6 of the fluid pressure damper H, and the position of a piston (not shown) connected to the rod 7 is set to a predetermined neutral position. It is provided for the purpose of preventing the situation where the fluid pressure damper H is restored to the position and the fluid pressure damper H remains at its maximum extension or contraction and cannot absorb high-frequency vibrations, thereby deteriorating the riding comfort in the vehicle.

  As described above, the shock absorber D configured as described above can linearly move the screw shaft 5 in the vertical direction in FIG. 1 by rotationally driving the ball screw nut 4 with the torque generated by the motor 3. Thus, the linear motion of the screw shaft 5 can also be suppressed by applying a thrust to the screw shaft 5 by positively generating torque in the motor 3 in response to an external force input. Further, when the screw shaft 5 is forcibly linearly moved by an external force, the rotor 3a of the motor 3 connected to the ball screw nut 4 exhibits a rotational motion, and the motor 3 performs the rotational motion of the rotor 3a caused by the induced electromotive force. The torque which suppresses is generated and it functions so that the linear motion of the screw shaft 5 may be suppressed.

  Therefore, the shock absorber D not only generates a damping force that suppresses the linear motion of the screw shaft 5 but also functions as an actuator. Therefore, the shock absorber D is connected to the vehicle body and the axle of the vehicle. If used in between, the attitude control of the vehicle body can be performed simultaneously, thereby functioning as an active suspension.

  Next, the mount M will be described in detail. As described above, the mount M includes the annular vibration-proof rubber 1 and the self-aligning bearing 2. The anti-vibration rubber 1 is interposed between an annular upper plate 10 that is bolted to the vehicle body B and an annular bearing holding ring 11 that faces the upper plate 10. It is bonded or welded to the holding ring 11 and integrated therewith.

  Further, the anti-vibration rubber 1 is provided with a constriction 1a at a site where a shearing force acts when the upper plate 10 and the bearing holding ring 11 are displaced in the horizontal direction in FIG. The lateral thickness of the constriction 1a is small and exhibits high rigidity with respect to the relative displacement in the radial direction between the upper plate 10 and the bearing retaining ring 11, that is, high with respect to lateral shear. In addition to exhibiting rigidity, a sufficient thickness is secured in the axial direction, and the upper plate 10 and the bearing holding ring 11 exhibit low rigidity with respect to relative displacement in the axial direction. It is designed to exhibit low rigidity against axial shear. The anti-vibration rubber 1 does not necessarily have to be annular.

  The self-aligning bearing 2 is a self-aligning roller bearing as shown in the figure, and a plurality of self-aligning bearings 2 are rotatably interposed in two rows between the outer ring 2a, the inner ring 2b, and the outer ring 2a and the inner ring 2b. The outer ring 2a is formed into a spherical surface, and the axis of the outer ring 2a can be freely inclined with respect to the axis of the inner ring 2b. The self-aligning bearing 2 may be a self-aligning ball bearing in addition to a self-aligning roller bearing.

  The outer ring 2 a of the self-aligning bearing 2 is held by the inner periphery of a bearing holding ring 11 integrated with the vibration isolating rubber 1, and the inner ring 2 b is a suspension spring S fixed to the outer periphery of the motor 3. It is held by an annular inner holding ring 14 that is coupled to an upper suspension spring receiver 12 that supports the upper end.

  That is, the mount M connects the anti-vibration rubber 1 to the vehicle body B and the self-aligning bearing 2 to the shock absorber D.

  The mount M configured as described above includes the self-aligning bearing 2 as the rotation and swing allowance means, and therefore, when the shock absorber D swings, the inner ring 2b freely tilts with respect to the outer ring 2a. Therefore, the shock absorber D can be allowed to swing with almost no resistance, and when the torque acts on the shock absorber D, the inner ring 2b can freely rotate with respect to the outer ring 2a. The rotation of the device D can be allowed with almost no resistance.

  Further, when the shock absorber D is displaced in the lateral direction in FIG. 1, the vibration-proof rubber 1 has a high rigidity characteristic with respect to the radial displacement between the upper plate 10 and the bearing holding ring 11. By generating a resilient force, the lateral displacement of the shock absorber D can be sufficiently suppressed. On the other hand, when the shock absorber D is displaced in the axial direction which is the vertical direction in FIG. 1 has a characteristic of low rigidity with respect to the axial displacement between the upper plate 10 and the bearing holding ring 11, so that the axial displacement of the shock absorber D is softly absorbed.

  Therefore, in the mount M according to the present invention, the anti-vibration rubber 1 is required to have high rigidity with respect to lateral displacement in the radial direction and low rigidity with respect to the axial direction, and low rigidity with respect to oscillation. The anti-vibration rubber 1 can be made lower in demand than the conventional level, so that the design of the anti-vibration rubber 1 can be afforded, and the volume of the anti-vibration rubber 1 does not have to be secured, so that the anti-vibration rubber 1 can be enlarged. Can be avoided.

  Since the required level of the anti-vibration rubber 1 is thus reduced, both low rigidity with respect to axial displacement and high rigidity with respect to the lateral direction can be achieved, and rotation that allows the shock absorber D to rotate and swing. By cooperating with the swing allowing means, it is possible to sufficiently allow the miso-scrubbing movement and the axial displacement of the shock absorber D and sufficiently suppress the lateral displacement.

  Further, since it is possible to set the lateral rigidity of the anti-vibration rubber 1 high, the shock absorber D does not interfere with the vehicle body B, and the miso-scrubbing motion and the axial displacement of the shock absorber D are further reduced. Since it is sufficiently allowed, it is possible to prevent an excessive bending force from acting on the shock absorber D, and there is no inconvenience that the friction at each part increases and the riding comfort of the vehicle is deteriorated.

  In this case, an excessive bending force does not act on the ball screw nut 4 and the screw shaft 5 in the actuator A due to the miso-scrubbing motion when the shock absorber D is expanded and contracted, so that the ball screw nut 4 and the screw shaft 5 are smoothly moved. The relative displacement can be maintained, and naturally, no excessive bending force is applied to the fluid pressure damper H, and the rod 7 and the rod 7 are sealed between the cylinder 6 and the internal piston in the fluid pressure damper H. Since a large frictional force is not generated at the sliding part such as between the packing, the riding comfort in the vehicle is not impaired.

  In the case of this embodiment, since the self-aligning bearing 2 is used as the rotation / oscillation allowing means, the miso-scrubbing motion of the shock absorber D is allowed without resistance. Therefore, the ball screw nut 4 and the screw shaft 5 are allowed. Further, the bending force input to the fluid pressure damper H can be drastically reduced, and the friction generated in the ball screw nut 4 and the screw shaft 5 of the shock absorber D and the sliding parts can be further effectively reduced. High effect can be expected to improve ride comfort.

  In the above description, the outer ring of the self-aligning bearing 2 is connected to the anti-vibration rubber 1, but the anti-vibration rubber is connected to the outer periphery of the shock absorber so that the inner ring of the self-aligning bearing is connected to the anti-vibration rubber. The outer ring of the self-aligning bearing may be connected to the vehicle body B.

  Further, in the above description, the actuator A having the upper suspension spring receiver 12 that supports the upper end of the suspension spring S is connected to the vehicle body B by the mount M. However, as shown in FIG. Can be made independent from the actuator A, and the upper suspension spring receiver 15 can be connected to the mount M ′, and the inner ring 2 b of the self-aligning bearing 2 and the actuator A can be connected by the elastic bodies 17 and 18.

  The upper suspension spring receiver 15 is not fixed to the outer periphery of the actuator A, but is independent, and is fixed to the inner ring 2 b of the self-aligning bearing 2. Specifically, the upper suspension spring receiver 15 is connected to an annular holding ring 16 that holds the inner ring 2 b of the self-aligning bearing 2 from the inner peripheral side, and is fixed to the inner ring 2 b of the self-aligning bearing 2.

  A cylindrical bush 19 is attached to the inner periphery of the holding ring 16, and this bush 19 is in sliding contact with the outer periphery of a cylindrical adapter 20 attached to the outer periphery of the motor 3. The ring 16 is positioned in the radial direction with respect to the motor 3 and can move up and down without rattling. The adapter 20 includes a flange 21 on the outer periphery of the lower end, and is fixed to the motor 3 by a nut 22 that is screwed onto the outer periphery of the motor 3.

  The holding ring 16 is disposed between the flange 21 and the nut 22, and an elastic body 17 is interposed between the lower end of the holding ring 16 and the flange 21. An elastic body 18 is interposed between the upper end of the nut and the nut 22.

  That is, the holding ring 16 is attached between the flange 21 and the nut 22 provided on the outer periphery of the actuator A so as to be movable in the vertical direction via the elastic bodies 17 and 18.

  Note that the outer ring 2a of the self-aligning bearing 2 is held by a bearing holding ring 11 integrated with the vibration isolating rubber 1 described above, and the mount M ′ shown in FIG. In addition, it comprises elastic bodies 17 and 18 interposed between the self-aligning bearing 2 and the actuator A. In this case, the elastic bodies 17 and 18 are made of rubber, but resins, coil springs, and other members that generate elastic force can be used.

  In the mount M ′ configured as described above, like the mount M described above, the anti-vibration rubber 1 exhibits high rigidity against lateral displacement and low rigidity against axial displacement. Since the self-aligning bearing 2 permits the rotation and swinging of the shock absorber D, the above-described excellent effects can be obtained, and the suspension spring S and the shock absorber D can be supported independently and the elastic bodies 17 and 18 can be With the intervention, there is an advantage that the rigidity of the mount M ′ on the suspension spring S side and the rigidity of the mount M ′ on the shock absorber D side can be adjusted separately.

  In this embodiment, the rotational swing allowing means is the self-aligning bearing 2, but for example, a spherical body is attached to the outer periphery of the actuator A, and the spherical body is attached to the anti-vibration rubber 1 side. A ball joint may be formed by providing an annular member to be held, and this ball joint may be used as a rotation swinging permitting means, or a universal joint structure or other structure may be used.

  Further, in each of the embodiments described above, the shock absorber D is configured by the actuator A and the fluid pressure damper H, but may be a known shock absorber using fluid pressure such as hydraulic pressure or air pressure. The effect of the present invention is not lost.

  Further, the upper suspension spring support that supports the upper end of the suspension spring S may be directly connected to the vehicle body without using a mount or a shock absorber.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

  The present invention can be used for a mount for attaching a shock absorber to a vehicle body.

DESCRIPTION OF SYMBOLS 1 Anti-vibration rubber | gum 2 Self-aligning bearing 2a as rotation-rotation allowance means Outer ring 2b in self-aligning bearing Inner ring 2c in self-aligning bearing Roller in self-aligning bearing 3 Motor 4 Ball screw nut 5 Screw shaft 6 Fluid pressure damper Cylinder 7 in fluid pressure damper rods 8 and 9 coil spring 10 upper plate 11 bearing retaining ring 12 and 15 upper suspension spring receiver 13 lower suspension spring receiver 14 inner circumferential retaining ring 16 retaining rings 17 and 18 elastic body 19 Bush 20 Adapter 21 Flange 22 Nut 23 Ball spline nut A Actuator B Car body D Shock absorber H Fluid pressure dampers M, M 'Mount S Suspension spring

Claims (4)

In a mount for connecting a shock absorber interposed between a vehicle body and an axle to the vehicle body, vibration isolating rubber connected to the vehicle body, and between the vibration isolating rubber and the shock absorber, A mount comprising a rotation / swing permission means for allowing rotation and swinging with respect to rubber. 2. The mount according to claim 1, wherein the rotation and swing permission means is a self-aligning bearing in which one of an outer ring and an inner ring is connected to a vibration-proof rubber and the other is connected to a shock absorber. An upper suspension spring receiver, which is interposed between the vehicle body and the axle and supports the upper end of the suspension spring that elastically supports the vehicle body, is connected to the vehicle body, and an elastic body is interposed between the rotation swing permitting means and the shock absorber. The mount according to claim 1, wherein the mount is mounted. Anti-vibration rubber has a constriction at the site where the shearing force in the lateral direction acts, reduces the lateral thickness at the site relative to the axial thickness, and exhibits high rigidity against shearing in the lateral direction. The mount according to any one of claims 1 to 3, wherein the mount exhibits low rigidity against axial shearing.

Images