Stepless rigidity-variable energy accumulator and application thereof

Abstract

The invention discloses a stepless variable-rigidity energy accumulator which comprises a shell and a piston arranged in the shell, the piston divides the interior of the energy accumulator into a working cavity and an oil cavity, a movable piston is arranged in the working cavity, and the movable piston moves in the working cavity so that the size of the working cavity can be changed; the movable piston is provided with an adjusting stud used for adjusting the movable piston to move in the working cavity, and the adjusting stud is hollow. An air storage tank is arranged outside the energy accumulator shell, one end of a hollow adjusting stud is communicated with the variable working cavity, and the other end of the hollow adjusting stud extends out of the shell and is communicated with the air storage tank through a flexible pipe. According to the energy accumulator, the air storage tank is arranged outside the shell, the hollow adjusting stud is used for driving the movable piston to move, then the size of the working cavity of the energy accumulator is changed, the air storage tank and the working cavity are communicated, and then the rigidity is changed. The technical problem that the rigidity of a single energy accumulator in an existing energy accumulator cannot be changed is solved, and continuous change of the rigidity of the single energy accumulator is achieved.

Description

Technical Field

[0001] The invention relates to the field of mechanical engineering, and specifically designs an infinitely variable stiffness accumulator used in the field of automobile manufacturing and an application thereof. Background Art

[0002] The accumulator plays the role of energy conversion in the system, converting the system's energy into compression energy or potential energy and storing it. When the system needs it, the energy is released and re-supplied to the system.

[0003] Theoretical calculation formula for accumulator stiffness:

[0004] Among them, Kmec – accumulator stiffness;

[0005] γ——is the variable index;

[0006] G 重 - sprung mass;

[0007] P 0 - inflation pressure;

[0008] V 0 ——Initial volume of accumulator.

[0009] According to the theoretical calculation formula of accumulator stiffness, the stiffness of accumulator is inversely proportional to the product of charging pressure and initial volume. The stiffness of accumulator can be changed by changing the charging pressure or working volume of accumulator.

[0010] In the prior art, the accumulator is a sealed shell, the interior of which is divided into an oil chamber and a working chamber by a piston. The effective volume of the rigidity accumulator is a fixed value, which cannot be changed once it is manufactured.

[0011] The stiffness of the accumulator can only be changed by changing the pre-charged gas pressure. If you want to change the stiffness of the hydro-pneumatic spring, you need to connect multiple accumulators. Connecting different numbers of accumulators can achieve different stiffness adjustments. In this way, stiffness adjustment has levels. When designing a spring, you can only design the accumulator volume and initial pressure to meet most performance requirements. It is not possible to adjust the stiffness in real time according to the needs, so that the hydro-pneumatic spring can obtain the optimal stiffness value under all working conditions.

[0012] Moreover, in some mechanical devices, such as automobiles, which have a high degree of integration and limited space, an accumulator that occupies a smaller space is needed. Once infinitely variable stiffness is achieved, an accumulator that is easy to control and has a more stable structure is needed. Summary of the invention

[0013] In order to achieve the above invention purpose, the present invention discloses an accumulator with infinitely variable stiffness, which uses a gas storage tank arranged outside the shell, uses a hollow adjusting stud to drive the movable piston to move, thereby changing the volume of the working chamber of the accumulator and connecting the gas storage tank with the working chamber, thereby changing the stiffness. The technical problem of the existing accumulator that the stiffness of a single accumulator is immutable is solved, and the stiffness of a single accumulator is continuously changed.

[0014] The technical solution of the present invention is as follows:

[0015] An infinitely variable stiffness accumulator comprises a shell, a piston arranged inside the shell, the piston divides the inside of the accumulator into a working chamber and an oil chamber, a movable piston is arranged in the working chamber, the movable piston moves in the working chamber, so that the volume of the working chamber is variable; an adjusting stud for adjusting the movement of the movable piston in the working chamber is arranged on the movable piston, and the adjusting stud is hollow;

[0016] An air storage tank is arranged outside the accumulator housing, one end of the hollow adjusting stud is connected to the variable working chamber, and the other end extends out of the housing and is connected to the air storage tank through a flexible pipe.

[0017] Furthermore, the movable piston includes a mounting hole arranged on the movable piston and a movable piston sealing ring arranged on the outer side of the movable piston.

[0018] Furthermore, the adjusting stud is installed on the movable piston through a mounting hole and a nut on the movable piston.

[0019] Furthermore, a sealing ring for adjusting the stud is arranged in the mounting hole.

[0020] Furthermore, a driving mechanism for driving the adjusting stud to move is arranged on the housing.

[0021] Furthermore, the driving mechanism includes a motor housing arranged on the housing, a motor located inside the motor housing, a motor shaft, and a gear set.

[0022] Furthermore, the gear set includes an inner gear ring arranged inside the motor housing, a spline arranged on the motor shaft, and a planetary gear set for output.

[0023] Furthermore, the planetary gear set includes a sun gear sleeved on the adjusting stud, a planetary gear meshing with the sun gear, and a planetary gear carrier sleeved on the adjusting stud.

[0024] Furthermore, a vent valve is provided on the flexible tube.

[0025] The second technical solution of the present invention:

[0026] The invention discloses an application of a stepless variable stiffness accumulator in automobiles.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention adds a movable piston inside the existing accumulator, which plays a role in changing the volume of the working chamber of the accumulator. In order to adjust the movable piston and the air pressure of the working chamber, a hollow adjusting stud is used, which solves the problem that the accumulator in the prior art cannot change the stiffness, and achieves the technical effect of being able to output continuous stiffness.

[0029] 2. The present invention arranges an air storage tank outside the accumulator housing, and reduces the space required for installing a single assembly part as much as possible under the premise that the accumulator obtains output continuous stiffness and does not increase the original accumulator volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of the present invention;

[0031] Figure 2 A schematic diagram of the structure of the movable piston of the present invention;

[0032] Figure 3 Schematic diagram of the gear set, drive mechanism and adjustment stud structure of the present invention.

[0033] In the figure, the housing 1, the piston 2, the working chamber 3, the oil chamber 4, the movable piston 5, the adjusting stud 6, the air storage tank 7, the flexible tube 8, the driving mechanism 9, the ventilation valve 10, the movable piston body 501, the movable piston sealing ring 502, the fixed adjusting stud nut 503, the motor housing 901, the motor housing internal gear 902, the motor shaft 903, the motor shaft spline 904, the sun gear 905, the planetary gear 906, and the planetary gear bracket 907. Specific embodiments

[0034] like Figure 1 As shown, an infinitely variable stiffness accumulator comprises a housing 1, a piston 2 arranged inside the housing 1, the piston 2 divides the interior of the accumulator into a working chamber 3 and an oil chamber 4, a movable piston 5 is arranged in the working chamber 3, the movable piston 5 moves in the working chamber 3, so that the volume of the working chamber 3 is variable; an adjusting stud 6 for adjusting the movement of the movable piston 5 in the working chamber 3 is arranged on the movable piston 5, and the adjusting stud 6 is hollow;

[0035] An air storage tank 7 is arranged outside the accumulator housing 1 . One end of a hollow adjusting stud 6 is connected to the variable working chamber 3 , and the other end extends out of the housing 1 and is connected to the air storage tank 7 through a flexible tube 8 .

[0036] The present invention adds a movable piston 5 and an adjusting stud 6, and the adjusting stud 6 drives the movable piston 5 to move up and down to change the volume of the accumulator working chamber 3. When the adjusting piston 2 moves, the gas in the working chamber 3 and the gas storage tank 7 flows, so that the amount of gas in the working chamber 3 will also change during the process of adjusting the volume of the working chamber 3. The effective stiffness of the accumulator is changed by changing the volume of the working chamber 3 and the amount of gas. Because the movable piston 5 is pushed by the adjusting stud 6, the stroke is continuously changed, so the continuous change of the accumulator stiffness can be achieved.

[0037] A vent valve 10 is provided between the flexible pipe 8 and the gas storage tank.

[0038] The adjusting stud 6 is designed to be hollow, and a vent valve 10 is provided at the connecting end of the adjusting stud 6 and the movable piston 3. The vent valve 10 plays a role in regulating the gas volume of the working chamber 3 and the gas storage tank 7.

[0039] like Figure 2 As shown, the movable piston 5 includes a mounting hole provided on the movable piston 5 and a sealing ring of the movable piston 5 provided on the outer side of the movable piston 5. The adjusting stud 6 is installed on the movable piston 5 through the mounting hole and the nut on the movable piston 5. The sealing ring of the adjusting stud 6 is provided in the mounting hole. Further, the mounting hole is provided on the movable piston 5 body, located in the middle position.

[0040] A movable piston sealing ring 502 is provided on the movable piston 5. The friction between the movable piston sealing ring 502 and the inner wall of the housing 1 can prevent the movable piston 5 from rotating relative to the accumulator housing.

[0041] like Figure 3 As shown, the hollow motor drives the planetary gear reducer to drive the adjusting stud 6, and the adjusting stud 6 drives the movable piston 5 to move up and down. The housing 1 is provided with a driving mechanism 9 for driving the adjusting stud 6 to move.

[0042] The driving mechanism 9 includes a motor housing 901 arranged on the housing 1 , a motor located inside the motor housing, a motor shaft 903 , and a gear set.

[0043] The gear set includes an inner gear ring 902 arranged inside the motor housing, a spline arranged on the motor shaft 903, and a planetary gear set for output.

[0044] The planetary gear set includes a sun gear 905 sleeved on the adjusting stud 6 , a planetary gear 906 meshing with the sun gear 905 , and a planetary gear carrier sleeved on the adjusting stud 6 . An internal thread 908 is provided inside the planetary gear carrier 907 .

[0045] The inner hole of the planetary gear bracket 907 is provided with an internal thread 908, and the internal thread 908 of the planetary gear bracket 907 is meshed with the external thread of the adjusting stud 6, and the planetary gear 906 is arranged on the planetary gear bracket 907. There are multiple planetary gears 906 in the present invention, and in some embodiments, there are three. Multiple planetary gears 906 are meshed with the external teeth of the sun gear 905, and multiple planetary gears 906 are meshed and rolled with the inner gear ring of the housing 1. The center hole of the sun gear 905 is provided with an internal spline, and is meshed with the external spline of the motor shaft 903. The motor drives the motor shaft 903 to rotate, and transmits power to the sun gear 905 through the spline, driving the sun gear 905 to rotate, the sun gear 905 drives the planetary gear 906 to rotate, the planetary gear 906 drives the planetary gear bracket 907 to rotate, and the planetary gear bracket 907 drives the adjusting stud 6 to move up and down, and the up and down movement of the adjusting stud 6 drives the movable piston 5 to move, which has the effect of changing the size of the working chamber 3.

[0046] The invention discloses an application of a stepless variable stiffness accumulator in automobiles.

Claims

1. An infinitely variable stiffness accumulator, comprising a housing (1), a piston (2) arranged inside the housing (1), the piston (2) dividing the interior of the accumulator into a working chamber (3) and an oil chamber (4), characterized in that: A movable piston (5) is arranged in the working chamber (3), and the movable piston (5) moves in the working chamber (3), so that the volume of the working chamber (3) is variable; an adjusting stud (6) is arranged on the movable piston (5) for adjusting the movement of the movable piston (5) in the working chamber (3), and the adjusting stud (6) is hollow; An air storage tank (7) is arranged outside the accumulator housing (1); one end of a hollow adjusting stud (6) is connected to a variable working chamber (3), and the other end extends out of the housing (1) and is connected to the air storage tank (7) through a flexible tube (8).

2. The stepless variable stiffness accumulator according to claim 1, characterized in that: The movable piston (5) comprises a mounting hole arranged on the movable piston (5) and a movable piston (5) sealing ring arranged on the outside of the movable piston (5).

3. The stepless variable stiffness accumulator according to claim 2, characterized in that: The adjusting stud (6) is mounted on the movable piston (5) through a mounting hole and a nut on the movable piston (5).

4. The stepless variable stiffness accumulator according to claim 3, characterized in that: A sealing ring for adjusting the stud (6) is arranged in the mounting hole.

5. The stepless variable stiffness accumulator according to claim 4, characterized in that: The housing (1) is provided with a driving mechanism (9) for driving the adjusting screw (6) to move.

6. The stepless variable stiffness accumulator according to claim 5, characterized in that: The driving mechanism (9) comprises a motor housing (901) arranged on the housing (1), a motor located inside the motor housing, a motor shaft (903), and a gear set.

7. The stepless variable stiffness accumulator according to claim 6, characterized in that: The gear set comprises an inner gear ring (902) arranged inside the motor housing, a spline (904) arranged on the motor shaft (903), and a planetary gear set for output.

8. The stepless variable stiffness accumulator according to claim 7, characterized in that: The planetary gear set comprises a sun gear (905) sleeved on an adjusting stud (6), a planetary gear (906) meshing with the sun gear (905), and a planetary gear bracket (907) sleeved on the adjusting stud (6).

9. The stepless variable stiffness accumulator according to claim 8, characterized in that: The flexible tube (8) is provided with a vent valve (10).

10. Application of an infinitely variable stiffness accumulator in automobiles, characterized in that: It comprises the stepless variable stiffness accumulator as described in any one of claims 1-9.

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