CN202867687U - Automobile shock absorber - Google Patents

Abstract

The utility model discloses an automobile shock absorber, which comprises a first storage oil cylinder, a movable oil cylinder, a first piston rod, a first piston and a spiral spring, wherein a first spring seat is fixed at one end of the first piston rod, which is far away from the first piston, and a second spring seat is fixed on the outer wall of the movable oil cylinder; the spiral spring is sleeved on the movable oil cylinder. The utility model can effectively improve the control stability and riding comfort in the running process of the automobile; also, the rolling of the automobile during turning can be prevented.

Description

car shock absorber

technical field

The utility model relates to automobiles, in particular to an automobile shock absorber. the

Background technique

The automobile shock absorber is one of the most important components in the automobile chassis system. The main structure of the traditional automobile shock absorber includes a piston rod, a working cylinder, a piston, an oil storage cylinder and a guide sleeve, etc. The guide sleeve is arranged between the piston rod and the storage Between the oil cylinders, there is an interference fit with the working cylinder and a gap fit with the oil storage cylinder. The oil seal is arranged between the guide sleeve and the upper end sealing plate of the oil storage cylinder, closely fits with the guide sleeve, and is slidably connected with the piston rod. The working cylinder only passes through the guide When the car is driving on an uneven road, the frame and the axle will move up and down relative to the vibration, the piston in the shock absorber moves up and down, and the piston in the shock absorber cavity The oil repeatedly flows from one cavity through different pores into another cavity. At this time, the friction between the hole wall and the oil and the internal friction between the oil molecules form a damping force on the vibration, so that the vibration energy of the car is converted into oil. The heat energy is absorbed by the shock absorber and released into the atmosphere to realize the shock absorption of the car. the

The design of this shock absorber has led to the following two situations during the driving of the car: one situation is that the stability of the car's driving handling has been enhanced (the shock absorber is adjusted harder, the compression stroke of the suspension and Neither the stretch travel can be performed smoothly) at the expense of ride comfort; the other is that the ride comfort of the car has been enhanced (the shock absorber is tuned softer, the compression travel and extension travel of the suspension can be smoothly performed) At the expense of the stability of the car handling. Therefore, most of the cars are compromised in both driving stability and riding comfort, so that although the car has a certain degree of comfort and handling, both are mediocre, and the suspension has no toughness at all. . the

In addition, the center of gravity of the car body is shifted to the outside of the turn due to centrifugal force during the turning process of the existing car, causing the car body to tilt to the outside, which also seriously affects the comfort of riding and the stability of handling. Although the existing high-end cars are equipped with a chassis lifting system, such as using air springs as elastic components, supplemented by vehicle height sensors, vehicle speed sensors, direction angle sensors, etc., the information during the turning process of the car is collected in real time, and then the chassis is processed through calculation. Lifting control; however, in such chassis lifting technology, when the sensor detects that a certain suspension height is not enough, air is added to the air spring to raise the height of the side where the suspension is located, so that the lifting of the chassis appears obvious. Lag, still can't timely and effectively prevent the vehicle from rolling when turning. the

Utility model content

Aiming at the above-mentioned deficiencies existing in the prior art, the purpose of this utility model is to provide a kind of automobile shock absorber, which has a simple structure, can effectively improve the shock absorption effect of the automobile, and at the same time improve the stability of the control and the comfort of the ride during the driving process of the automobile. sex. the

In order to achieve the above object, the technical solution adopted by the utility model is as follows: an automobile shock absorber, which is characterized in that it includes a first storage oil cylinder, a movable oil cylinder, a first piston rod, a first piston and a coil spring. One end of the first storage cylinder is closed, and the other end is provided with a first through hole through which the first piston rod passes; one end of the first piston rod extends into the first storage cylinder from the first through hole of the first storage cylinder, The first piston is connected with the end where the first piston rod extends into the first storage cylinder; several convection oil holes are also opened on the end where the first through hole of the first storage cylinder is located and the first piston; One end is provided with a second through hole for the first piston rod to pass through, and the other end is provided with a third through hole for the first storage cylinder to pass through. The hole penetrates into the movable cylinder, and passes through the second through hole of the movable cylinder, and the third through hole of the movable cylinder is inserted into the first storage cylinder; the end of the first piston rod away from the first piston is fixed with a first spring seat, A second spring seat is fixed on the outer wall of the movable oil cylinder; the coil spring is sheathed on the movable oil cylinder, and its two ends are respectively fixed with the first spring seat and the second spring seat. the

Further, a seal is provided between the second through hole and the first piston rod and between the third through hole and the first storage oil cylinder. the

Preferably, the first piston rod is a hollow tube structure. the

Further, the first piston is annular and arranged coaxially with the first piston rod. the

Further, the first spring seat is an annular structure, and is arranged coaxially with the first piston rod. the

Further, it also includes a turning non-roll adjustment mechanism, the turning non-roll adjustment mechanism includes a second storage oil cylinder and a second piston rod, and there are two second storage oil cylinders, one end of which is closed, and the other end is opened with a The fourth through hole for the second piston rod to pass through is provided with an oil pipe interface on the side wall near the closed end of the second storage oil cylinder, and the oil pipe interface communicates with the inside of the second storage oil cylinder; the two ends of the second piston rod Respectively extend into the second storage cylinder from the fourth through holes on the two second storage cylinders, the two second storage cylinders are connected by a connecting rod, and a second piston is arranged at both ends of the second piston rod, and the second piston rod The middle part is also fixed with a moving part for moving the second piston rod; the oil pipe interfaces of the two second storage oil cylinders are respectively connected to one end of the first piston rod away from the first piston through oil pipes. the

A turning non-roll adjustment mechanism matched with the above-mentioned shock absorber is characterized in that it includes a second storage oil cylinder and a second piston rod. There are two second storage oil cylinders, one end of which is closed, and the other end is provided with a The fourth through hole through which the second piston rod passes is provided with an oil pipe interface on the side wall of the second storage oil cylinder close to its closed end, and the oil pipe interface communicates with the inside of the second storage oil cylinder; the two ends of the second piston rod are respectively Extend into the second storage cylinder from the fourth through hole on the two second storage cylinders, the two second storage cylinders are connected by a connecting rod, and a second piston is arranged at both ends of the second piston rod, and the second piston rod The middle part is also fixed with a moving part for moving the second piston rod. the

Further, a seal is provided between the second piston and the two second storage cylinders. the

Compared with the prior art, the utility model has the advantages of simple structure, which can effectively improve the stability of the vehicle during driving and the comfort of the ride; moreover, the vehicle shock absorber and the turning non-roll adjustment mechanism are coordinated Using it can prevent the car from tilting during turning, so that the car can turn smoothly and without roll. the

Description of drawings

Fig. 1 is the structural representation of shock absorber in the utility model embodiment 1;

Fig. 2 is the structural representation of shock absorber in the utility model embodiment 2;

Fig. 3 is a structural schematic diagram of a turning non-roll adjustment mechanism.

In the figure, 1—first storage cylinder, 2—first piston rod, 3—first piston, 4—movable oil cylinder, 5—first spring seat, 6—second spring seat, 7—coil spring, 8—convection Oil hole, 9—second storage cylinder, 10—second piston rod, 11—oil pipe interface, 12—second piston, 13—connecting rod, 14—moving parts. the

Detailed ways

The utility model will be further described below in conjunction with accompanying drawings and embodiments. the

Embodiment 1: Referring to Fig. 1, a kind of automobile shock absorber comprises the first storage oil cylinder 1, movable oil cylinder 4, first piston rod 2, first piston 3 and coil spring 7, in the first storage oil cylinder 1 and the first The surface of the piston rod 2 is chrome-plated, which makes the surface of the first storage cylinder 1 and the first piston rod 2 smoother, which is conducive to the sealing of the oil by the seal (sealing ring or oil seal, etc.) and has higher hardness, so that the first piston The rod 2 and the movable cylinder 4 move more smoothly relative to the first storage cylinder 1 , and make the service life of the first storage cylinder 1 , the movable cylinder 4 and the first piston rod 2 longer. the

One end of the first storage cylinder 1 is closed, and the other end is provided with a first through hole for the first piston rod 2 to pass through; one end of the first piston rod 2 extends from the first through hole of the first storage cylinder 1 In the first storage oil cylinder 1, the first piston 3 is connected with the end of the first piston rod 2 extending into the first storage oil cylinder 1, and the end where the first through hole of the first storage oil cylinder 1 is located and the first piston 3 are also connected. There are several convective oil holes 8. When making, there are stretching valves and compression valves at the convective oil holes 8, which are used to adjust the flow rate and flow rate of the convective oil holes 8, so that the effect of the shock absorber can be adjusted. . One end of the movable cylinder 4 is provided with a second through hole for the first piston rod 2 to pass through, and the other end is provided with a third through hole for the first storage cylinder 1 to pass through, and the first piston rod 2 is far away from the first piston One end of 3 penetrates the movable oil cylinder 4 from the third through hole of the movable oil cylinder 4, and passes through the second through hole of the movable oil cylinder 4, and the third through hole of the movable oil cylinder 4 is inserted into the first storage cylinder 1. In order to make the first piston rod 2 more stable during the movement, the first through hole of the first storage cylinder 1 is also provided with a guide device for the first piston rod 2, usually a guide sleeve or a guide seat, so as to ensure that the first piston rod 2 A piston rod 2 moves along its axial direction without shaking from side to side, so as to avoid abnormal noise or damage caused by collision between the first piston rod 2 and the first through hole. An annular baffle is also sleeved at a certain distance between the first piston rod 2 and the first piston 3, so as to prevent the shock absorber from being greatly stretched, the first piston 3 and the first storage cylinder 1 have a first communication One end of the hole directly collides, causing mutual damage; a buffer pad or a buffer spring is also sleeved on the first piston rod 2 between the baffle plate and the first through hole, which can prevent the baffle plate and the first storage cylinder 1 from having the first A direct collision occurs at one end of a through hole, which better protects the shock absorber. the

A first spring seat 5 is fixed on the end of the first piston rod 2 away from the first piston 3, and a second spring seat 6 is fixed on the outer wall of the movable oil cylinder 4; the coil spring 7 is sleeved on the movable oil cylinder 4, and its two The ends are respectively fixed with the first spring seat 5 and the second spring seat 6. A buffer sleeve is set on the first piston rod 2 between the first spring seat 5 and the movable oil cylinder 4, which can prevent the first spring seat 5 from directly colliding with the movable oil cylinder 4, thereby further protecting the shock absorber. A seal is arranged between the second through hole and the first piston rod 2 and between the third through hole and the first storage cylinder 1, and the seal is fixedly connected with the movable oil cylinder 4; And the oil liquid flows out from the gap between the second through hole and the first piston rod 2 and the gap between the third through hole and the first storage cylinder 1 during the moving process of the movable oil cylinder 4; Circle, the product technology is mature, can be used directly, the assembly is also convenient, and the cost is low. the

When assembling, all the spaces in the shock absorber are filled with oil; when installing, install the shock absorber vertically between the vehicle body (or frame) and the axle (or wheel), and make the first The spring seat 5 is located above the second spring seat 6, that is, at this time, the first spring seat 5 is the upper spring seat, the second spring seat 6 is the lower spring seat, and the closed end of the first storage oil cylinder 1 is the lower end. Its working principle ( process) is:

1) Compression stroke: When the upper end of the first piston rod 2 is under pressure, the first piston rod 2 is forced to push the first piston 3 to move downward. Since the piston rod occupies part of the volume above the first piston 3, the first piston 3 When moving downwards, compressing the volume of the first storage cylinder 1 below the first piston 3 is greater than releasing the volume of the first storage cylinder 1 above the first piston 3 when the first piston 3 moves downward, and at the same time, due to the first storage cylinder The lower end of 1 is closed, and the oil cannot be discharged from the bottom of the first storage cylinder 1, so that the oil enters the movable cylinder 4 after passing through the convection oil hole 8, and the oil in the movable cylinder 4 increases due to the oil entering the movable cylinder 4 , forcing the movable oil cylinder 4 to drive the lower spring seat to move upward together, further compressing the coil spring 7, so that the compression stroke of the coil spring 7 is greater than the compression stroke of the automobile suspension, thereby improving the supporting capacity of the coil spring 7 to the car body (body) At the same time, the automobile shock absorber can use no or less compression valves, so that the compression stroke of the suspension can be smoother, thereby greatly improving the support toughness of the suspension to the car body (body); stability.

2) Stretching stroke: when the spring returns, the upper and lower ends of the spring give an upward and downward force to the upper spring seat and the lower spring seat respectively, and the upper spring seat drives the first piston rod 2 and the first piston rod 2 to move upward, and the lower The spring seat drives the movable cylinder 4 to move downward. At this time, the oil pressure in the movable cylinder 4 increases, and the oil pressure in the first storage cylinder 1 decreases, so that the oil returns to the first storage cylinder 1. Below the piston 3, due to the downward movement of the lower spring seat, the stretching stroke of the spring is greater than that of the car suspension, so that the stretching vibration of the spring disappears during the greater stretching process, so that the stretching stroke of the suspension can be softer, thereby making the The ride comfort of the car is enhanced. the

Embodiment 2: Referring to Fig. 2 and Fig. 3, the difference from Embodiment 1 is that the first piston rod 2 is a hollow tube structure; the first piston 3 is ring-shaped, and the first spring seat 5 is ring-shaped structure, and both the first piston 3 and the first spring seat 5 are arranged coaxially with the first piston rod 2 . During specific manufacture, the first spring seat 5 can be connected with the end face of the first piston rod 2 through bolts, and the first piston 3 is sheathed on the first piston rod 2 .

It also includes a turning non-roll adjustment mechanism. The turning non-roll adjustment mechanism includes a second storage cylinder 9 and a second piston rod 10. There are two second storage cylinders 9, one end of which is closed, and the other end is opened with a The fourth through hole for the second piston rod 10 to pass through is provided with an oil pipe interface 11 on the side wall near the closed end of the second storage oil cylinder 9, and the oil pipe interface 11 communicates with the inside of the second storage oil cylinder 9; The two ends of the piston rod 10 stretch into the second storage cylinder 9 from the fourth through holes on the two second storage cylinders 9 respectively, and the two second storage cylinders 9 are connected by a connecting rod 13 , at the two ends of the second piston rod 10 Both are provided with a second piston 12, and the middle part of the second piston rod 10 is also fixed with a moving part 14 for moving the second piston rod 10; during production, the moving part 14 is a moving rod fixedly connected with the second piston rod 10 . The oil pipe interfaces 11 of the two second storage oil cylinders 9 are respectively connected to the end of a first piston rod 2 away from the first piston 3 through oil pipes. A seal is provided between the second piston 12 and the two second storage cylinders 9 . the

When assembling, install the shock absorber vertically between the vehicle body (or vehicle frame) and the axle (or wheel), and make the first spring seat 5 above the second spring seat 6, that is, at this time, the first The spring seat 5 is the upper spring seat, the second spring seat 6 is the lower spring seat, and the closed end of the first storage oil cylinder is the lower end. The closed ends of the steering wheel are filled with oil, the turning non-rolling adjustment mechanism is set horizontally, and the two shock absorbers connected with the oil pipe interface 11 of the turning non-rolling adjustment mechanism are both rear wheel shock absorbers or front wheel shock absorbers. shock absorber, and the moving part 14 in the middle of the piston rod is connected with a moving mechanism, and the moving mechanism is controlled by the turning mechanism. When the turning mechanism turns to one side, the moving mechanism can drive the moving part 14 to move, and the moving part 14 Drive the second piston rod 10 to move; by moving the second piston rod 10, the oil in the turning non-roll adjustment mechanism enters the automobile shock absorber on the outside of the turning direction, and realizes the first adjustment of the automobile shock absorber on the outside of the turning direction. A storage oil cylinder 1 replenishes oil; at the same time, the oil in the automobile shock absorber on the inner side of the turning direction is discharged from the automobile shock absorber into the turning non-roll adjustment mechanism. In this way, the oil in the outer automobile shock absorber increases, and because the lower end of the first storage cylinder 1 is closed, the oil lifts the first piston 3, and the first piston rod 2 moves upward, and at the same time, part of it enters the first cylinder. The oil in the storage oil cylinder 1 enters the movable oil cylinder 4 through the convection oil hole 8, thereby lifting the movable oil cylinder 4, and the movable oil cylinder 4 lifts the first piston rod 2 again through the coil spring 7, so that the vehicle will eventually turn The outside of the car is jacked up; on the contrary, the oil of the car shock absorber on the inside of the turning direction of the car enters the turning non-roll adjustment mechanism, so that the oil in the car shock absorber is reduced, and the oil pressure is reduced. At this time, the first piston rod 2 moves downward, at the same time, the oil in the movable oil cylinder 4 enters the first storage oil cylinder 1 through the convection oil hole 8, so that the movable oil cylinder 4 moves downward, so that the inner side of the automobile sinks when the automobile turns; Balance and avoid the car leaning during the turn. In addition, since the moving part 14 of the turning without roll adjustment mechanism is synchronously driven (or controlled) by the turning mechanism of the automobile, it can be driven mechanically (directly driven by the steering mechanism) or controlled by the control system (through the turning sensor Detect the steering angle, and then be processed and controlled by the control system), so that the automatic adjustment of the car body can be realized in real time and effectively. the

Since the inclination of the vehicle body in the turning process is also related to the speed of the vehicle, the control system may also include a vehicle speed sensor in the actual implementation to control the turning non-rolling adjustment mechanism through the combination of the vehicle speed and the turning curvature, so that the turning without the rolling adjustment mechanism The size of the moving part 14 on the upper part during the turning process is jointly driven by the vehicle speed and the turning angle, that is, the faster the vehicle speed and the greater the turning degree, the larger the moving part 14 is. Add more oil to raise the height of the outer car body, and remove the oil in the inner shock absorber in the turning direction to lower the height of the inner car body, so as to further realize the balance of the car body during the turning process; on the contrary, the slower the car speed, The smaller the turning angle is, the smaller the moving range of the moving part 14 is, and similarly, the balance of the car body during the turning process of the car is realized. In this way, the car can realize no-roll turning when running at any speed, and further improve ride comfort and control stability. the

Embodiment 3: Referring to FIG. 3 , a turning non-roll adjustment mechanism matched with the above-mentioned shock absorber includes a second storage cylinder 9 and a second piston rod 10. There are two second storage cylinders 9, one end of which is closed, the other end is provided with a fourth through hole for the second piston rod 10 to pass through, and an oil pipe interface 11 is provided on the side wall of the second storage oil cylinder 9 near its closed end, and the oil pipe interface 11 is connected to the second storage oil cylinder 9 connected internally. Both ends of the second piston rod 10 respectively extend into the second storage cylinder 9 from the fourth through holes on the two second storage cylinders 9, and seals are arranged between the second piston 12 and the two second storage cylinders 9 . The two second storage oil cylinders 9 are connected by a connecting rod 13, and the two ends of the second piston rod 10 are provided with a second piston 12, and the middle part of the second piston rod 10 is also fixed with a moving part for moving the second piston rod 10 14. During specific production, the moving part 14 adopts a moving rod, which is more convenient for processing.

When assembling, install the shock absorber vertically between the vehicle body (or vehicle frame) and the axle (or wheel), and make the first spring seat 5 above the second spring seat 6, that is, at this time, the first The spring seat 5 is the upper spring seat, the second spring seat 6 is the lower spring seat, and the closed end of the first storage oil cylinder is the lower end. The closed ends of the cylinders are filled with oil, and the turning non-roll adjustment mechanism is set horizontally, and the oil pipe interfaces 11 of the two second storage oil cylinders 9 are respectively connected to the end of the first piston rod 2 away from the first piston 3 through oil pipes ( At this time, the first piston rod 2 is required to be a hollow tube structure, and the oil in the second storage cylinder 9 can enter the shock absorber through the first piston rod 2). The two shock absorbers connected to the oil pipe interface 11 of the turning non-roll adjustment mechanism are both rear wheel shock absorbers or front wheel shock absorbers, and the moving part 14 in the middle of the piston rod is connected with a moving mechanism. The moving mechanism is controlled by the turning mechanism. When the turning mechanism turns to one side, the moving mechanism can drive the moving part 14 to move, and at the same time, the moving part 14 drives the second piston rod 10 to move; by moving the second piston rod 10, there is no side inclination when turning The oil in the adjusting mechanism enters the automobile shock absorber on the outer side of the turning direction to replenish oil to the first storage cylinder 1 of the automobile shock absorber on the outer side of the turning direction; at the same time, the oil in the automobile shock absorber on the inner side of the turning direction Exhaust from the car's shock absorber enters the cornering no-roll adjustment mechanism. In this way, the oil in the outer automobile shock absorber increases, and because the lower end of the first storage cylinder 1 is closed, the oil lifts the first piston 3, and the first piston rod 2 moves upward, and at the same time, part of it enters the first cylinder. The oil in the storage oil cylinder 1 enters the movable oil cylinder 4 through the convective oil hole 8, thereby jacking the movable oil cylinder 4, and the movable oil cylinder 4 lifts the first piston rod 2 again through the coil spring 7, thereby finally realizing that the vehicle will move when turning. The outside of the car is jacked up; on the contrary, the oil of the car shock absorber on the inside of the turning direction of the car enters the turning non-roll adjustment mechanism, so that the oil in the car shock absorber is reduced, and the oil pressure is reduced. At this time, the first piston rod 2 moves down, and at the same time, the oil in the movable cylinder 4 enters the first storage cylinder 1 through the convection oil hole 8, so that the movable cylinder 4 moves downward, so that the inside of the automobile sinks when the automobile turns; finally, the balance when turning is realized , to avoid the car from tilting during the turn. In addition, since the moving part 14 of the turning without roll adjustment mechanism is synchronously driven (or controlled) by the turning mechanism of the automobile, it can be driven mechanically (directly driven by the steering mechanism), or controlled by the control system (through the turning sensor Detect the steering angle, and then be processed and controlled by the control system), so that the automatic adjustment of the car body can be realized in real time and effectively. the

Since the inclination of the vehicle body in the turning process is also related to the speed of the vehicle, the control system may also include a vehicle speed sensor in the actual implementation to control the turning non-rolling adjustment mechanism through the combination of the vehicle speed and the turning curvature, so that the turning without the rolling adjustment mechanism The size of the moving part 14 on the upper part during the turning process is jointly driven by the vehicle speed and the turning angle, that is, the faster the vehicle speed and the greater the turning degree, the larger the moving part 14 is. Add more oil to raise the height of the outer car body, and remove the oil in the inner shock absorber in the turning direction to lower the height of the inner car body, so as to further realize the balance of the car body during the turning process; on the contrary, the slower the car speed, The smaller the turning angle is, the smaller the moving range of the moving part 14 is, and similarly, the balance of the car body during the turning process of the car is realized. In this way, the car can realize no-roll turning when running at any speed, and further improve ride comfort and control stability. the

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than limit the technical solutions. Although the applicant has described the utility model in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that, Those who make modifications or equivalent replacements to the technical solutions of the present invention without departing from the purpose and scope of the technical solutions shall be included in the scope of the claims of the present invention. the

Claims (6)

1. automobile absorber is characterized in that: comprise the first storage oil cylinder, movable cylinder, first piston bar, first piston and helical spring, and the end sealing of described the first storage oil cylinder, the other end offers the first through hole that passes for the first piston bar; Described first piston bar one end stretches in the first storage oil cylinder from the first through hole of the first storage oil cylinder, and described first piston links to each other with the end that the first piston bar stretches into the first storage oil cylinder; The the first through hole institute of the first storage oil cylinder at one end with also offer several to oil flow hole on the first piston; One end of described movable cylinder offers the second through hole that passes for the first piston bar, the other end offers the third through-hole that passes for the first storage oil cylinder, the first piston bar penetrates movable cylinder away from an end of first piston from the third through-hole of movable cylinder, and pass from the second through hole of movable cylinder, the third through-hole of movable cylinder is inserted in the first storage oil cylinder; Be fixed with the first spring seat at the first piston bar away from an end of first piston, be fixed with the second spring seat on the outer wall of movable cylinder; Described helical spring is set on the movable cylinder, and its two ends are fixed with the first spring seat and the second spring seat respectively.

2. a kind of automobile absorber according to claim 1 is characterized in that: be provided with Sealing between the second through hole and the first piston bar and between third through-hole and the first storage oil cylinder.

3. a kind of automobile absorber according to claim 1 and 2, it is characterized in that: described first piston bar is hollow tubular structure.

4. a kind of automobile absorber according to claim 3 is characterized in that: described first piston ringwise, and with the coaxial setting of first piston bar.

5. a kind of automobile absorber according to claim 4, it is characterized in that: described the first spring seat is loop configuration, and with the coaxial setting of first piston bar.

6. a kind of automobile absorber according to claim 5, it is characterized in that: comprise that also one turns without rolling controlling mechanism, described turning comprises the second storage oil cylinder and the second piston rod without rolling controlling mechanism, described the second storage oil cylinder is two, the sealing of one end, the other end offers the fourth hole that passes for the second piston rod, is provided with tubing interface at the second sidewall of storing close its closed end of oil cylinder, and described tubing interface and the second storage oil cylinder inside are connected; The second storage oil cylinder is stretched into from two second fourth holes of storing on the oil cylinders respectively in the two ends of the second piston rod, two second storage oil cylinders link to each other by a connecting rod, be provided with the second piston at the two ends of the second piston rod, the middle part of the second piston rod also is fixed with the moving member for mobile the second piston rod; The tubing interface of two second storage oil cylinders links to each other with the end of a first piston bar away from first piston by oil pipe respectively.

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