JP5426946B2 - Vehicle height adjustment pump - Google Patents

Description

  The present invention relates to an improvement in a vehicle height adjustment pump.

  As this type of vehicle height adjustment pump, for example, hydraulic pressure is applied to a jack chamber that is provided on the outer periphery of a shock absorber interposed between an axle of a motorcycle and a vehicle body and that faces one end of a suspension spring that faces a spring receiver. It is known to supply and discharge.

  Specifically, the vehicle height adjusting pump is defined by a cylinder, a pump chamber that is slidably inserted into the cylinder, and communicated with the jack chamber. It is configured to include a cylindrical nut that is movably inserted and comes into contact with the piston on the side opposite to the pump chamber, and a screw shaft that is rotatably inserted into the cylinder and screwed into the nut and is driven to rotate by a motor. ing.

  In this vehicle height adjusting pump, the oil chamber is filled with hydraulic oil, and when the screw shaft is driven to rotate by the torque of the motor, the nut advances and retreats in the axial direction with respect to the cylinder and contacts the nut. The piston can be moved axially relative to the cylinder. When the piston is moved relative to the cylinder in this way, the volume of the pump chamber increases / decreases, so that the vehicle height adjusting pump supplies / discharges hydraulic oil to / from the jack chamber communicated with the pump chamber. Can do.

  When hydraulic oil is pushed out from the pump chamber and hydraulic oil is supplied to the jack chamber, the jack chamber expands and the spring receiver is pushed downward with respect to the hydraulic shock absorber, so that the vehicle height can be raised. When the volume of the pump chamber is increased, the jack chamber is compressed via the spring receiver by the spring force of the suspension spring, the hydraulic oil is discharged to the pump chamber, and the spring receiver rises with respect to the hydraulic shock absorber. The vehicle height can be lowered (see, for example, Patent Document 1).

JP 2001-88528 A

  The conventional vehicle height adjusting pump is provided with bolt insertion holes in two flanges protruding to the side of the cylinder, and is attached to the motorcycle via the flanges.

  However, since the acceleration of vibration acting on the motorcycle is large and the motor is generally weak against vibration input, there is a possibility that the motor will be adversely affected if the vibration is transmitted to the motor.

  In view of the above, the present invention has been made in order to improve the above-described problems, and an object thereof is to provide a vehicle height adjusting pump capable of suppressing vibration input to a motor.

In order to solve the above-described object, the problem-solving means of the present invention includes a cylinder, a piston that is slidably inserted into the cylinder, a pump chamber partitioned by the piston in the cylinder, and the piston that pivots with respect to the cylinder. The above-described pump is provided through a pipe with a jack chamber facing a spring receiver provided on the outer periphery of a shock absorber interposed between the axle of the motorcycle and the vehicle body and supporting one end of a suspension spring. A vehicle height adjustment pump that communicates with the chamber and adjusts the vehicle height by driving the spring receiver in a direction that matches the expansion and contraction direction of the suspension spring by supplying and discharging the working fluid to and from the jack chamber. And a plate for holding the motor,
The plate includes a main body, cylinder insertion holes provided in the main body, bolt insertion holes, and fixing bolt insertion holes,
Insert the cylinder into the cylinder insertion hole and connect the cylinder to the gear case integral with the motor via the bolt inserted into the bolt insertion hole,
Further characterized in that fixed to the vehicle body of the motorcycle through the fixing bolt and integral vibration-proof rubber and fixing bolt inserting the plate into the fixed bolt insertion holes.

  Since the plate that holds the motor is fixed to the motorcycle via the anti-vibration rubber, not only the vibration input from the motorcycle side to the plate is suppressed, but also due to the vibration of the shock absorber. Even if the vibration is input from the piping side, the vibration can be attenuated by the anti-vibration rubber.

  Therefore, the vibration input to the motor is suppressed and the vibration of the motor can be attenuated. Therefore, the motor can be protected from the vibration, and the reliability and practicality of the vehicle height adjusting pump is improved.

It is a ZZ arrow longitudinal cross-sectional view of the vehicle height adjustment pump in one embodiment of this invention. It is a top view of the vehicle height adjustment pump in one embodiment of the present invention. It is a perspective view of the plate of the vehicle height adjustment pump in one embodiment of the present invention. It is the figure which showed the state which fixed the vehicle height adjustment pump in one embodiment of this invention to the motorcycle. 1 is a perspective view showing a mounting state of a vehicle height adjusting pump in a motorcycle according to an embodiment of the present invention.

  The present invention will be described below based on the embodiments shown in the drawings. As shown in FIGS. 1 and 4, the vehicle height adjusting pump 1 is provided on the outer periphery of a shock absorber D interposed between a swing arm A and a vehicle body B that pivotally supports a rear wheel shaft of a motorcycle. The working fluid is supplied to and discharged from a jack chamber J opposed to the spring receiver 2 that supports one end of the spring S, and is fixed to a seat rail R that supports a seat of the motorcycle as shown.

  Then, the vehicle height adjustment is performed by driving the spring receiver 2 in a direction corresponding to the extending and contracting direction of the suspension spring S by supplying and discharging the working fluid to the jack chamber J with the vehicle height adjusting pump 1. .

  Further, the shock absorber D includes an outer shell 3 and a rod 4 inserted into the outer shell 3, and generates a predetermined damping force when the rod 4 enters and exits the outer shell 3. Yes.

  The jack chamber J is defined by a cylindrical housing 5 attached to the outer periphery of the outer shell 3 and an annular spring receiver 2 slidably attached to the outer periphery of the outer shell 3.

  Specifically, the housing 5 includes a cylindrical body 5a that is opposed to the outer periphery of the outer shell 3 at a predetermined interval, and a flange that protrudes from the upper end of the cylindrical body 5a toward the inner peripheral side and is fixed to the outer periphery of the outer shell 3. 5b. The spring receiver 2 includes a cylindrical portion 2a that is slidably mounted on the outer periphery of the outer shell 3, and an annular receiving portion 2b that is provided at the lower end of the cylindrical portion 2a and supports the upper end of the suspension spring S. The outer shell 3 is movable up and down in FIG.

  Then, the cylindrical portion 2 a of the spring receiver 2 is slidably inserted into the annular gap between the cylindrical body 5 a of the housing 5 and the outer shell 3, so that the spring receiver 2 is interposed between the spring receiver 2 and the housing 5. A jack chamber J is formed so as to oppose the spring receiver 2, and the jack chamber J applies an internal pressure to the spring receiver 2.

  The suspension spring S is sandwiched between the spring receiver 2 and the spring receiver 6 attached to the lower end of the rod 4 and is integrally attached to the shock absorber body D. The spring receiver 2 is attached upward. The urging force of the suspension spring S acts on the jack chamber J so as to compress it.

  Accordingly, when the working fluid is supplied to the jack chamber J, the volume of the jack chamber J increases, so that the spring receiver 2 can move downward in FIG. 1 to increase the vehicle height. When the fluid is discharged, the spring receiver 2 is moved upward in FIG. 1 by the urging force of the suspension spring S that compresses the jack chamber J, the volume of the jack chamber J is reduced, and the vehicle height is lowered.

  On the other hand, the vehicle height adjusting pump 1 is defined by a cylindrical cylinder 10 with a top and a piston 11 that is slidably inserted into the cylinder 10 and communicates with the jack chamber J through a hose 12 as a pipe. The pump chamber P is configured to include a motor M that drives the piston 11 in the axial direction with respect to the cylinder 10, and a plate 30 that holds the cylinder 10 and the motor M.

  Hereinafter, the vehicle height adjusting pump 1 will be described in detail. The cylinder 10 includes a cylinder body 10a having a top shape and a flange 10b extending outward from the opening end of the cylinder body 10a. The opening end side is enlarged in diameter to have an enlarged diameter portion 10c, and a female screw is formed over the entire circumference of the enlarged diameter portion 10c.

  The piston 11 is slidably inserted into the cylinder main body 10a, and defines a pump chamber P in the cylinder 10 on the upper side in FIG. 1 from the piston 11, and the pump chamber P is connected to the cylinder main body 10a. The jack chamber J communicates with a hose 12 connected to the top of the jack. A seal ring 15 is attached to the outer periphery of the piston 11, and the seal ring 15 is in sliding contact with the inner periphery of the cylinder body 10 a to prevent leakage of working fluid from the pump chamber P.

  A cylindrical nut 13 is accommodated on the side of the piston 11 opposite to the pump chamber. The nut 13 is provided with a female screw portion 13a over its entire length on the inner circumference, and penetrates the wall thickness to the outer circumference side. It has a pin 13b that protrudes from the top.

  Further, the nut 13 is inserted into a cylindrical guide member 16 that is also inserted into the cylinder 10 and fixed to the inner periphery of the enlarged diameter portion 10c. As shown in FIG. 1, the guide member 16 includes an annular fixed portion 16 a that is fitted and fixed to the enlarged diameter portion 10 c of the cylinder 10, and a cylindrical guide portion 16 b that extends toward the piston 11 side. Configured.

  The shoulder portion of the fixed portion 16a is provided with a notch 16c into which the protrusion 10d provided at the deepest portion of the enlarged diameter portion 10c of the cylinder 10 enters, and the guide member 16 is fitted to the inner periphery of the enlarged diameter portion 10c of the cylinder 10. By joining, the guide member 16 is prevented from rotating with respect to the cylinder 10.

  Further, the guide portion 16 b includes a longitudinal groove 16 d along the axial direction on the inner periphery, and a pin 13 b is inserted into the longitudinal groove 16 d, and the nut 13 is prevented from rotating with respect to the guide member 16. Accordingly, the nut 13 is housed in the cylinder 10 while being prevented from rotating.

  Further, the nut 13 is screwed onto the outer periphery of the screw shaft 14 that is rotationally driven by the motor M, and the nut 13 that is prevented from rotating by rotationally driving the screw shaft 14 is the screw shaft in the manner of the feed screw mechanism. 14 is moved in the axial direction so that the piston 11 can be driven in the axial direction with respect to the cylinder 10. In addition, since the piston 11 always receives pressure from the pump chamber P and is pressed downward in FIG. 1, it does not operate separately even if the nut 13 and the piston 11 are not integrated. However, these may be integrated.

  The screw shaft 14 includes a base portion 14b, a shaft portion 14c rising from the base portion 14b, a male screw portion 14a formed at the tip of the shaft portion 14c, a flange 14d provided on the outer periphery of the base portion 14b, and a lower end of the base portion 14b. And a cylindrical socket 14e having an inner shape set to a shape other than a circle and an outer shape set to a circle.

  As described above, after assembling the piston 11, the nut 13, the guide member 16 and the screw shaft 14 to the cylinder 10, the thrust bearing 17 is stacked on the flange 14 d of the screw shaft 14, and the annular lid 18 is attached to the cylinder 10. When screwed into the inner circumference of the enlarged diameter portion 10c, the screw shaft 14 is rotatably accommodated in the cylinder 10. Further, a cylindrical bush 19 is mounted on the inner periphery of the lid 18, and this bush 19 is in sliding contact with the outer periphery of the socket 14 e of the screw shaft 14, so that the screw shaft 14 does not run out in the radial direction. The cylinder 10 is rotatably fixed. When the lid 18 is screwed to the inner circumference of the enlarged diameter portion 10c of the cylinder 10, the lid 18 comes into contact with the lower end of the guide member 16 screwed to the enlarged diameter portion 10c on the outer circumference of the upper end in FIG. The member 16 is fixed to the cylinder 10.

  As described above, since the piston 11 is constantly pressed from the pump chamber P and pressed downward in FIG. 1, the screw shaft 14 to which the nut 13 is screwed is also always pressed downward, and the flange 11 Even if the contact between 14d and the thrust bearing 17 is maintained and there is play (gap) between the flange 14d and the step portion formed at the boundary between the fixed portion 16a of the guide member 16 and the guide tube 16b, the screw shaft 14 is not rattled in the axial direction in the cylinder 10, and play is provided between the guide member 16 and the friction that prevents rotation of the screw shaft 14 is reduced.

  Further, one end of the shaft 20a of the worm wheel 20 is inserted into the socket 14e of the screw shaft 14, and the outer shape of one end of the shaft 20a is a shape other than a circle and matches the inner shape of the socket 14e. The worm wheel 20 and the screw shaft 14 are integrally rotated with respect to the cylinder 10.

  The other end of the shaft 20 a is inserted into a hole 21 a provided in a gear case 21 fixed to the flange 10 b of the cylinder 10, and the worm wheel 20 is rotatably fixed to the cylinder 10 by the gear case 21. . Further, a worm 22 is engaged with the worm wheel 20, and the worm 22 is connected to a motor M fixed to the gear case 21 so that the worm 22 can be rotationally driven by the motor M. Yes. If it is not necessary to decelerate and transmit the rotation of the motor M to the screw shaft 14, the worm gear may be omitted, and a gear mechanism other than the worm gear may be employed as the speed reduction mechanism.

  Thus, the cylinder 10 and the motor M are integrated by the gear case 21, and are fixed to the plate 30 by the three bolts 23 used when the gear case 21 and the cylinder 10 are connected. As shown in FIG. 3, the plate 30 is made of resin, and includes a rectangular main body 30 a, a cylinder insertion hole 30 b that is provided in the main body 30 a and through which the cylinder 10 is inserted, and three bolts that allow the bolts 23 to be inserted. A bolt insertion hole 30c and fixed bolt insertion holes 30d provided at three corners are provided.

The plate 30 is bolted to the seat rail R of the motorcycle via a vibration isolating rubber 31.
That is, the cylinder 10 is inserted into the cylinder insertion hole 30c and the cylinder 10 is coupled to the gear case 21 integral with the motor M via the bolt 23 inserted into the bolt insertion hole 30c.
Further, the plate 30 is fixed to the vehicle body side seat rail R of the motorcycle via a fixing bolt 34 inserted into the fixing bolt insertion hole 30d and an anti-vibration rubber 31 integrated with the fixing bolt 34.
The anti-vibration rubber 31 has a disk shape, and, as shown in FIG. 5, a motorcycle-side bolt 32 bolted to the seat rail R and a fixing bolt 34 bolted to the plate 30 are integrated. .

  More specifically, the two-wheeled vehicle-side bolt 32 includes a disc-shaped base portion 32a to which the vibration isolating rubber 31 is bonded or welded and integrated, and a screw shaft 32b rising from the base portion 32a. The screw shaft 32b is inserted into the holes a and b provided in advance, and is bolted to the seat rail R in cooperation with the nut 33 screwed to the screw shaft 32b.

  The other fixing bolt 34 includes a disk-shaped base 34a to which the vibration isolating rubber 31 is bonded and welded and integrated, and a screw shaft 34b rising from the base 34a. The fixing bolt 34 is provided in the fixing bolt insertion hole 30d. The screw shaft 34b is inserted, and the bolt 30 is fastened to the plate 30 in cooperation with a nut 35 screwed to the screw shaft 34b.

  Then, two fixing bolts 34 are bolted to the plate 30 using two selected fixing bolt insertion holes 30d provided in the plate 30, and holes a and b provided in the seat rail R are used. By fastening the two motorcycle-side bolts 32 to the seat rail R, the plate 30 is fixed to the seat rail R of the motorcycle via the anti-vibration rubber 31.

  In this case, since the three fixing bolt insertion holes 30d are provided in the plate 30, depending on how the two fixing bolt insertion holes 30d into which the fixing bolts 34 are inserted are selected, The mounting posture to the motorcycle can be changed, which is convenient, but the number of fixing bolt insertion holes 30d is arbitrary, and is not limited to the above three. Further, in this case, the plate 30 is bolted directly to the seat rail R of the motorcycle, but a stay or the like is attached to the seat rail R, and the plate 30 is indirectly connected to the seat rail R via the stay. Furthermore, the fixing position of the plate 30 is not limited to the seat rail R.

  Further, the vibration isolating rubber 31 can dampen vibrations in the radial direction well, and in a motorcycle, there are more inputs in the front and rear and up and down directions than in the lateral direction. It is possible to effectively dampen the vibration input to the vehicle height adjusting pump 1 by being attached to the motorcycle in accordance with the above. That is, the vibration input to the vehicle height adjusting pump 1 can be effectively damped by matching the vibration isolating direction of the vibration isolating rubber 31 with the front, rear, top and bottom of the motorcycle.

  By the way, since the swing arm A swings with respect to the vehicle body B, the shock absorber D interposed between the swing arm A and the vehicle body B automatically uses the attachment portion with the vehicle body B as a fulcrum as it expands and contracts. Exhibits movement in the front-rear direction of the motorcycle.

  Since the vibration of the shock absorber D is transmitted to the vehicle height adjusting pump 1 as vibration through the hose 12 as a pipe, vibration due to the vibration of the shock absorber D also acts on the motor M. .

  However, since the plate 30 holding the motor M is fixed to the motorcycle via the vibration isolating rubber 31, not only vibration input from the seat rail R side to the plate 30 is suppressed, but also the shock absorber D swings. Even if the vibration caused by the above is input from the hose 12 side, the vibration isolating rubber 31 can attenuate the vibration.

  When the motor M is driven, the rotation of the motor M is decelerated and transmitted to the screw shaft 14 by the worm gear composed of the worm 22 and the worm wheel 20, and when the screw shaft 14 rotates, the female screw portion 13a and the male screw portion 14a. The nut 13 that is prevented from rotating with respect to the cylinder 10 is moved in the axial direction that is the vertical direction in FIG.

  In this way, by driving the motor M, the piston 11 can be moved in the axial direction with respect to the cylinder 10, and the volume in the pump chamber P can be increased or decreased.

  When the piston 11 is moved upward in FIG. 1, the volume of the pump chamber L is reduced, and an amount of working fluid corresponding to the reduced volume in the pump chamber P is discharged from the vehicle height adjusting pump 1 to jack it. The vehicle height can be raised by supplying it to the chamber J. Conversely, when the piston 11 is moved downward in FIG. 1, the volume of the pump chamber P increases and is urged in the compression direction by the suspension spring S. The volume of the jack chamber J is reduced in accordance with the increased volume of the pump chamber P, and an amount of working fluid is discharged from the jack chamber J and absorbed by the pump chamber P, so that the vehicle height can be lowered. .

  And since the plate 30 holding the motor M is fixed to the motorcycle via the anti-vibration rubber 31, not only vibration input from the motorcycle side to the plate 30 is suppressed, but also a shock absorber. Even if the vibration caused by the swing of D is input from the hose 12 side, the vibration isolation rubber 31 can attenuate the vibration.

  Accordingly, vibration input to the motor M is suppressed and vibration of the motor M can be attenuated, so that the motor M can be protected from vibration, and the reliability and practicality of the vehicle height adjusting pump 1 are improved. To do.

  Further, when the plate 30 is formed of a resin material, vibration input from the motorcycle side can be suppressed by the plate 30 in addition to the vibration reduction by the vibration isolating rubber 31, so that the vibration isolating effect is high. Further, since the vibration can be absorbed by the elastic deformation of the plate 30 against the vibration caused by the vibration of the shock absorber D acting through the hose 12 as a pipe, the vibration damping effect is also enhanced. In addition, since the plate 30 is elastically deformed when vibration is input from the hose 12 as a pipe, it is possible to avoid an excessive bending force acting on the attachment portion of the hose 12 to the cylinder body 10a. The fatigue of the hose 12 can be suppressed.

  Further, since the vibration isolating rubber 31 effectively suppresses vibration in the radial direction, vibration in the front-rear and vertical directions of the plate 30 with respect to the seat rail R can also be suppressed.

  Further, when the plate 30 is fixed to the seat rail R of the motorcycle, the seat rail R is branched from the frame F supporting the engine, and the transmission of the engine vibration is small, so that the vibration of the motor M is further reduced. Can be reduced.

  In the case of this embodiment, the plate 30 is fixed using holes a and b provided in the seat rail R. However, in fixing the plate 30 of the motorcycle, for example, to the seat rail R, A plate that is bolted to the plate 30 facing the plate 30 may be provided on the back side of the seat rail R, and the seat rail R may be sandwiched between the plate 30 and the back side plate. In this case, anti-vibration rubber is provided on the front side and the back side of the seat rail R, and the anti-vibration rubber is interposed between the plate 30 and the seat rail R and between the back-side plate and the seat rail R, respectively. Then, the seat rail R may be sandwiched between these anti-vibration rubbers.

 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 vehicle height adjusting pump of the present invention can be used for a vehicle height adjusting jack of a motorcycle.

DESCRIPTION OF SYMBOLS 1 Vehicle height adjustment pump 2 Spring receiver 2a Cylinder part 2b in a spring receiver 3 Receiving part in a spring receiver 3 Outer shell 4 Rod 5 Housing 5a Housing cylinder 5b Flange 6 in housing 10 Lower spring receiver 10 Cylinder 10a Cylinder body 10b 10c Diameter-enlarged portion 10d Projection 11 Piston 12 Hose 13 as pipe Nut 13a Female screw portion 13b in nut Pin 14 in nut Screw shaft 14a Male screw portion 14b in screw shaft Base portion 14c in screw shaft Shaft portion 14d in screw shaft In screw shaft Flange 14e Socket 15 on screw shaft Seal ring 16 Guide member 16a Fixed portion 16b on guide member Guide cylinder 16c on guide member Notch 16d on guide member Vertical groove 17 on guide member 17 Thrust bearing 18 Lid 19 Bush 20 Worm wheel 20a Worm wheel shaft 21 Gear case 21a Gear case hole 22 Worm 30 Plate 30a Plate body 30b Plate cylinder insertion hole 30c Plate bolt insertion hole 30d Plate fixed bolt insertion hole 31 Anti-vibration rubber 32 motorcycle side bolt 32a base 32b screw shaft 33 nut 34 fixing bolt 34a base 34b screw shaft 35 nut 35
A swing arm a, b hole B vehicle body D shock absorber F frame J jack chamber M motor P pump chamber R seat rail S suspension spring

Claims (5)

A cylinder, a piston that is slidably inserted into the cylinder, a pump chamber partitioned by the piston in the cylinder, and a motor that drives the piston in an axial direction with respect to the cylinder; A jack chamber facing a spring receiver that supports one end of a suspension spring provided on the outer periphery of a shock absorber interposed between the pump chamber and the pump chamber is connected through a pipe, and a spring is supplied by supplying and discharging working fluid to the jack chamber. In the vehicle height adjustment pump that adjusts the vehicle height by driving the receiver in a direction that matches the expansion and contraction direction of the suspension spring, the pump is separate from the shock absorber and includes a plate that holds the motor.
The plate includes a main body, cylinder insertion holes provided in the main body, bolt insertion holes, and fixing bolt insertion holes,
A cylinder is inserted into the cylinder insertion hole, and the cylinder is coupled to a gear case integrated with the motor via a bolt inserted into the bolt insertion hole. Further, a fixing bolt having a plate inserted into the fixing bolt insertion hole, and the fixing bolt A vehicle height adjustment pump characterized by being fixed to the motorcycle body through an integrated anti-vibration rubber. The vehicle height adjusting pump according to claim 1, wherein the plate is made of an elastic resin. 3. The vehicle height adjusting pump according to claim 1, wherein the vibration isolating direction of the anti-vibration rubber is made to coincide with the front, rear, top and bottom of the motorcycle. The vehicle height adjusting pump according to any one of claims 1 to 3, wherein the plate is fixed to a seat rail of the motorcycle. A fixing bolt inserted into a fixing bolt insertion hole provided in the plate and fastened to the plate; and a motorcycle side bolt inserted into a hole provided in the motorcycle and bolted to the motorcycle. The vehicle height adjusting pump according to any one of claims 1 to 4, wherein the side bolts are integrated via vibration-proof rubber.

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