JP4250701B2 - Oil height adjustment oil pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle height adjustment oil pump for correcting a vehicle body to a desired height while adjusting a supporting force of a suspension spring in response to a change in an on-vehicle load, and more particularly to a suspension while being mounted on a vehicle body. The present invention relates to a vehicle height adjusting oil pump capable of changing the supporting force of a spring.
[0002]
[Prior art]
As such a vehicle height adjusting oil pump, a vehicle height adjusting oil having a structure as shown in FIG. 2 is conventionally used as a driving source for adjusting a vehicle height in a rear wheel suspension device of a motorcycle such as a motorcycle. The pump a is generally well known and widely used in practice.
[0003]
That is, in this conventional vehicle height adjustment oil pump a, one end opening of the pump cylinder b is closed with a partition wall d screwed to the screw c, and the piston e is slidable inside the pump cylinder b. The piston e defines the inner part of the pump cylinder b as an oil chamber f filled with working oil.
[0004]
From the outside through the partition wall d, an operation screw h for adjusting the vehicle height having a square head g is screwed with a retaining ring i provided on the outer peripheral surface of the front end thereof, and screwed. Is in contact with the back side of the piston e.
[0005]
On the other hand, a cylindrical nut j having a double nut action from above the partition body d is provided so that the partition body d screwed and attached to the screw c is not loosened due to vibration or the like during traveling of the vehicle. Is fastened to the screw c and stopped.
[0006]
Then, the cylindrical nut j is secured with a snap ring k, and the operation handle m is rotatably inserted. The axial direction of the shape that fits the square head g of the operation screw h is inserted into the operation handle m. The attached elongated hole n is formed, and the square head g and the elongated hole n are fitted to each other.
[0007]
Thus, the operation screw h is advanced and retracted through the partition wall d while rotating the operation screw h in accordance with the rotation direction of the operation handle m, and the piston e disposed at the tip is moved inside the pump cylinder b. By moving forward and backward in the axial direction, hydraulic oil is supplied to and discharged from a suspension spring adjustment oil jack (not shown) through the supply / discharge port p to adjust the vehicle height.
[0008]
[Problems to be solved by the invention]
As described above, in the conventional vehicle height adjustment oil pump a, the partition wall d for moving the operation screw h in the axial direction along with the turning operation is coupled to the pump cylinder b with the screw c. In addition, a cylindrical nut j having a double nut action is tightened on the screw c so as to prevent the looseness of the partition wall d from being loosened by the screw c.
[0009]
As a result, it is necessary to perform threading for joining the inner peripheral surface of the pump cylinder b and the outer peripheral surface of the partition wall d to each other and to join the partition body d by screwing it into the screw c of the pump cylinder b. In addition, a large number of man-hours such as the production and tightening of the cylindrical nut j for preventing the loosening of the partition wall d are required for the production and assembly.
[0010]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the means of the present invention penetrates through a partition wall that closes one end of the pump cylinder, inserts an operation screw for adjusting the vehicle height inside and outside, and rotates this operation screw from the outside. In the vehicle height adjustment oil pump, the piston disposed at the tip is advanced and retracted in the axial direction in the pump cylinder, and the hydraulic oil is supplied and discharged by the pump cylinder and the piston to adjust the vehicle height. The partition body is a non-circular deformed fitting that fits at least a part of the outer peripheral surface of the pump cylinder to each other to prevent rotation, and the lower portion of the partition body is formed on the inner periphery of the pump cylinder. And the upper part of the partition wall is locked by a locking ring fitted on the inner peripheral surface of the pump cylinder to prevent the upper part from coming off upward. Be
In this case, an operating handle is rotatably inserted above the pump cylinder so as to face the partition wall, and an elongated hole along the axial direction is formed in the operating handle so as to fit the square head of the operating screw. It is preferable that the square head and the elongated hole are fitted to advance and retract in the vertical direction while rotating the operation screw through the operation handle from the outside.
[0011]
[Means for Solving the Problems]
The above-described object of the present invention is to insert an operation screw for adjusting the vehicle height through the partition body that closes one end of the pump cylinder, and to dispose the operation screw at the tip while rotating the operation screw from the outside. In a vehicle height adjustment oil pump in which the piston is advanced and retracted in the axial direction in the pump cylinder and the hydraulic oil is supplied and discharged by the pump cylinder and the piston, the partition body is the pump cylinder. In contrast, at least a part of the outer peripheral surface is fitted with a non-circular deformed fit to prevent rotation, and a locking ring is fitted between the inner peripheral surface of the pump cylinder to prevent it from coming off. Achieved.
[0012]
In other words, by configuring as described above, the fitting means that is formed at the material stage of the pump cylinder and the bulkhead body without depending on the screw connection that requires troublesome processing for the rotation prevention means of the bulkhead body to the pump cylinder. It is possible to easily prevent both rotations using a non-circular portion that can be combined.
[0013]
Furthermore, in addition to the above, the means for preventing the separation of the partition wall from the pump cylinder is not carried out by screwing a cylindrical nut that performs a double nut action, but is equivalent to a snap ring that has been widely used for various devices in the past. This can be done using rings, which can greatly reduce the processing and assembly costs of the parts.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the embodiment of the present invention is used as a drive source for adjusting the vehicle height in the same manner as the oil pump for adjusting the vehicle height in the conventional rear wheel suspension system of the motorcycle shown in FIG. A description will be given based on a preferred vehicle height adjusting oil pump 1 of FIG.
[0015]
That is, in the vehicle height adjustment oil pump 1 shown in FIG. 1 according to the embodiment of the present invention, a piston 3 is slidably inserted from one end opening of a pump cylinder 2, and the lower part of the pump cylinder 2 is driven by the piston 3. An oil chamber 4 filled with working oil is defined in the inner part.
[0016]
The oil chamber 4 is connected to a vehicle suspension spring adjusting oil jack (not shown) through a supply / discharge port 5 formed at the lower end of the pump cylinder 2, and is similar to the conventional oil pump for adjusting the vehicle height. The vehicle height is adjusted while supplying or discharging the working oil from the supply / discharge port 5.
[0017]
In the vehicle height adjusting oil pump 1 of FIG. 1 according to the embodiment of the present invention, as well known in the art, for example, the oil for adjusting the suspension spring on the supply / discharge port 5 and the vehicle side is used. The jacks are connected to each other by using hoses, pipes and the like, and oil is exchanged from the supply / discharge port 5 through these hoses and pipes.
[0018]
Instead of doing this, an insertion ring for mounting to the rear wheel suspension device is formed integrally with the pump cylinder 2 without using the supply / exhaust port 5, and this insertion ring is connected to the oil jack for adjusting the suspension spring. By supporting one end of the suspension spring for the rear wheel as the movable part, the hydraulic oil may be exchanged through a supply / discharge hole that is directly drilled from the pump cylinder 2 over the insertion ring.
[0019]
The pump body 2 is inserted into the pump cylinder 2 after the piston 3 from above, and at least a part of the outer peripheral surface of the partition body 6 is compatible with the inner peripheral surface of the pump cylinder 2. It is fitted as a circular deformed fitting 7 and is prevented from rotating by the deformed fitting 7 .
Further, the lower part of the partition wall 6 is engaged with a step 2A formed on the inner periphery of the pump cylinder 2 to prevent downward movement, and the upper part of the partition body 6 is connected to the inner peripheral surface of the pump cylinder 2. It is locked by the fitted locking ring 8 to prevent upward slipping.
[0020]
The bulkhead body 6 is provided with an operation screw 10 for adjusting the vehicle height which penetrates in the axial direction and has a square head 9 at the upper end from the outside by a locking ring 11 provided on the outer peripheral surface of the front portion. The operation screw 10 is screwed and the tip of the operation screw 10 is brought into contact with the back side of the piston 3 so that pressing and releasing can be performed.
[0021]
Above the partition wall 6, an operation handle 14, which is inserted through the tip of the pin 13 from the side wall of the pump cylinder 2 to the annular groove 12 and is prevented from coming off, is rotatably inserted. An elongated hole 15 is formed along the axial direction in a shape that fits the 10 rectangular heads 9, and the operating screw 10 is rotated from the outside through the operation handle 14 by fitting the rectangular head 9 and the elongated hole 15. It was made to move forward and backward by screwing with the partition wall 6 while moving.
[0022]
In this embodiment, in addition to the above, the retaining ring 8 prevents the partition body 6 from coming off from the pump cylinder 2, and the operation handle 14 is engaged by the engagement between the annular groove 12 and the pin 13. Also, the opposing area between the partition wall 6 and the operation handle 14 is increased, and the click mechanism 16 can be interposed between the partition wall 6 and the operation handle 14.
[0023]
Accordingly, the deformed fitting 7 that is a means for preventing the rotation of the partition wall 6 with respect to the pump cylinder 2 can be cast at the time of forming the pump cylinder 2 and the partition body 6 at the material stage without depending on the screw connection that takes time for processing. It can be formed without machining using the means, and the non-circular portion can be easily prevented from rotating using the irregular fitting 7 of the non-circular portion.
[0024]
Furthermore, in addition to the above, the means for preventing the separation of the partition wall 6 from the pump cylinder 2 is not performed by screwing a cylindrical nut that performs a double nut action, and is equivalent to a snap ring that has been widely used in various devices conventionally. The locking ring 8 can be used, and these can greatly reduce the processing cost and assembly cost of the parts.
[0025]
【The invention's effect】
As described above, according to the first aspect of the present invention, the operation screw for adjusting the vehicle height is screwed into the inside and outside through the partition body closing one end of the pump cylinder, and the operation screw is rotated from the outside. However, a vehicle height adjusting oil pump in which the piston disposed at the tip is advanced and retracted in the axial direction in the pump cylinder, and the hydraulic oil is supplied and discharged by the pump cylinder and the piston. In this case, the partition body is non-circular irregularly fitted to the pump cylinder so that at least a part of the outer peripheral surface is compatible with each other to prevent rotation, and a locking ring is fitted between the inner peripheral surface of the pump cylinder. Since the stopper is also provided, the anti-rotation mechanism between the pump cylinder and the bulkhead body can be easily formed without machining by using means such as casting when forming at the material stage by deformed fitting. Door is possible.
[0026]
In addition to this, the means for preventing the separation of the partition wall from the pump cylinder is not carried out by screwing a cylindrical nut having a double nut action, and the same engagement as that of a snap ring that has been widely used in various devices conventionally. This can be done using stop rings, which can greatly reduce the processing and assembly costs of the parts.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view showing a vehicle height adjusting oil pump according to the present invention, in particular, a vehicle height adjusting oil pump which can change the supporting force of a suspension spring while being mounted on a vehicle body.
FIG. 2 is a front view of a conventionally known vehicle height adjustment oil pump of this type, which is shown longitudinally.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle height adjustment oil pump 2 Pump cylinder 3 Piston 4 Oil chamber 5 Supply / discharge port 6 Partition body 7 Deformed fitting 8 Locking ring 10 Operation screw

Claims (2)

An operation screw for adjusting the vehicle height is inserted inside and outside through the partition wall that closes one end of the pump cylinder, and the piston disposed at the tip is rotated in the axial direction inside the pump cylinder while rotating the operation screw from the outside. In the vehicle height adjusting oil pump, the partition body is at least a part of the outer peripheral surface of the pump cylinder. And a non-circular deformed fitting that fits each other to prevent rotation, and further, the lower part of the partition wall is engaged with a step formed on the inner periphery of the pump cylinder to prevent downward movement and An oil pump for adjusting a vehicle height , wherein an upper portion of the partition wall is locked by a locking ring fitted into an inner peripheral surface of the pump cylinder to prevent upward separation . An operation handle is rotatably inserted above the pump cylinder so as to face the partition wall, and an elongated hole along the axial direction is formed in the operation handle so as to fit the square head of the operation screw. 2. The vehicle height adjusting oil pump according to claim 1, wherein the square head and the elongated hole are fitted to each other so as to advance and retract in the vertical direction while rotating the operation screw through the operation handle from the outside.

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