CN212536305U - Cylinder piston positioning device and gearbox with same - Google Patents
Cylinder piston positioning device and gearbox with same Download PDFInfo
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- CN212536305U CN212536305U CN202020952495.9U CN202020952495U CN212536305U CN 212536305 U CN212536305 U CN 212536305U CN 202020952495 U CN202020952495 U CN 202020952495U CN 212536305 U CN212536305 U CN 212536305U
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Abstract
The utility model discloses a cylinder piston positioning device, wherein a first piston and a second piston are arranged in a cylinder body, the first piston is sleeved on a piston rod, and the second piston is sleeved on the first piston; a first step is arranged on the outer wall of the second piston, and a cylinder body step is arranged on the inner wall of the cylinder body; by using the principle of pressure difference, when the two ends of the cylinder block simultaneously supply certain air pressure, the piston can be fixed at a certain selected position. The gearbox with the cylinder piston positioning device is further disclosed, and gear shifting can be achieved. When the L end enters air, the air pressure pushes the first piston and the second piston to move together, when the second piston reaches the step of the cylinder block, the second piston stops moving, and the first piston continues to move to the end R position; when the end R is used for air inlet, the air pressure pushes the first piston and the second piston to move together to the end L, and when the two ends of the cylinder body are used for air inlet simultaneously, the pistons can be fixed and stay at a certain set position.
Description
Technical Field
The utility model relates to a cylinder technical field, in particular to cylinder piston positioner and have its gearbox.
Background
The common cylinder piston device can not accurately position the piston, and a pneumatic servo positioning system is usually adopted for positioning a pneumatic piston mechanism in the traditional method. But because the working medium-air has the factors of large compressibility and the like, the establishment of an accurate mathematical model of the pneumatic positioning system is very difficult. Therefore, the control algorithm of the pneumatic positioning system is often complex, and the difficulty in the control technology limits the wide-range application of the pneumatic positioning system. In order to achieve a good control effect, people usually adopt a relatively expensive servo valve or a proportional valve as a control element, which causes high system cost, and the servo valve or the proportional valve has a large volume and is inconvenient to install in some places.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cylinder piston positioner, when giving certain atmospheric pressure simultaneously at the piston both ends, alright make the piston fix in certain selected position, with low costs, easy to assemble.
A second object of the utility model is to provide a have cylinder piston positioner's gearbox realizes shifting and returns the neutral gear function.
The utility model discloses a realize through following technical scheme:
a cylinder piston positioning device comprises a cylinder body and a piston rod, wherein one end of the piston rod extends into the cylinder body, an air inlet end on one side of the cylinder body is used as an L end, and an air inlet end on the other side of the cylinder body is used as an R end;
a first piston and a second piston are arranged in the cylinder block, the first piston is sleeved on the piston rod, and the second piston is sleeved outside the first piston;
a first step is arranged on the outer wall of the second piston, and a cylinder body step for blocking the first step is arranged on the inner wall of the cylinder body;
the contact area of the L end of the second piston and the gas is S1; the contact area of the L end of the first piston and the gas is S2, and the contact area of the R end of the first piston and the gas is S3; s1+ S2> S3, S2< S3.
Further, the first piston is fixedly connected with the piston rod.
Further, a second step is arranged on the outer wall of the first piston, a vertical surface of the second step is used for being in contact with the end face of the R end of the second piston, and a horizontal surface of the second step is in contact with the inner wall of the cylinder body.
Furthermore, a first groove is formed in the outer wall, in contact with the second piston, of the first piston.
Further, a sealing ring is arranged in the first groove.
Furthermore, a second groove and a third groove are formed in the outer wall of the first piston.
Furthermore, a wear-resistant ring is installed in the second groove, and a sealing ring is installed in the third groove.
Furthermore, a fourth groove is formed in the outer wall of the second piston, and a sealing ring is installed in the fourth groove.
The utility model also discloses a have cylinder piston positioner's gearbox, the end that stretches out of piston rod is connected with the gear shift fork of gearbox.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a cylinder piston positioning device, wherein a first piston and a second piston are arranged in a cylinder body, the first piston is sleeved on a piston rod, and the second piston is sleeved on the first piston; a first step is arranged on the outer wall of the second piston, and a cylinder body step is arranged on the inner wall of the cylinder body; when air is simultaneously supplied to two ends of the cylinder block (the pressure is the same), when the initial positions of the first piston and the second piston are positioned in the L-end area, because S1+ S2> S3, F1+ F2> F3, the first piston and the second piston move towards the R end together, when the first step of the second piston reaches the position of the cylinder step, the cylinder step blocks the first step, and the second piston stops moving; at this time, the L-end pushing force of the first piston is F2, the R-end pushing force acting on the first piston is F3, and S2< S3, so F2< F3, so that the first piston cannot move to the R end continuously. When the piston tends to move towards the L end, the piston has F1+ F2> F3, so that the piston cannot move towards the L end continuously, and the first piston and the second piston are stably stopped at the step of the cylinder block. On the contrary, when the initial position of the first piston is at the R end, both ends of the cylinder block are simultaneously charged (the pressure is the same), F2< F3 because S2< S3, and the first piston moves to the L end, and when the second step surface of the first piston contacts with the second piston, and at this time, F1+ S2> S3, and therefore F1+ F2> F3, the first piston cannot push the second piston to move together to the L end, and the two pistons stop at the step of the cylinder block. Therefore, when air is simultaneously fed to two ends of the cylinder, the piston can be fixedly stopped at a certain set position. The cylinder piston positioning device is of a pure mechanical structure, does not need a control element, and is low in cost and convenient to install and disassemble.
Further, a second step is arranged on the outer wall of the first piston, a vertical surface of the second step is used for being in contact with the end face of the R end of the second piston, and a horizontal surface of the second step is in contact with the inner wall of the cylinder body. The first piston and the second piston are linked, when the first piston moves to the R end, the first piston is pushed by the second piston in the axial direction, and when the first piston moves to the L end, the second piston is pushed by the first piston in the axial direction.
The utility model also discloses a have cylinder piston positioner's gearbox, the end that stretches out of piston rod is connected with the gear shift fork of gearbox, and first piston is in L end and R end extreme position and represents two gears, and the gearbox needs the neutral gear, can be in order to represent the neutral gear position when first piston is in cylinder block step department. In short, the mechanism can be used for returning the gears to the neutral position, i.e. to the neutral position, when the automatic gearbox is pneumatically controlled to shift gears.
Drawings
Fig. 1 is a schematic structural view of the cylinder piston positioning device of the present invention when the initial position of the piston is at the L end;
fig. 2 is a schematic structural view of the cylinder piston positioning device of the present invention when the initial position of the piston is at the end R;
fig. 3 is a schematic diagram of the final state structure of the cylinder piston positioning device of the present invention when air is simultaneously admitted to both ends of the cylinder;
fig. 4 is a schematic structural diagram of a second piston according to the present invention;
fig. 5 is a schematic structural view of the first piston with the piston rod of the present invention;
fig. 6 is another directional view of fig. 5.
Wherein, 1 is the cylinder block, 2 is the piston rod, 3 is first piston, 4 is the second piston, 5 is first step, 6 is the second step, 7 is the cylinder body step, 8 is first recess, 9 is the second recess, 10 is the third recess, 11 is the fourth recess, 12 is the sealing washer.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in fig. 1 to 3, the utility model discloses a cylinder piston positioning device, which comprises a cylinder body 1 and a piston rod 2, wherein one end of the piston rod 2 extends into the cylinder body 1, the air inlet end on one side of the cylinder body 1 is used as an L end, and the air inlet end on the other side is used as an R end; a first piston 3 and a second piston 4 are arranged in the cylinder block 1, the first piston 3 is sleeved on the piston rod 2, and the second piston 4 is sleeved on the first piston 3; the outer wall of the second piston 4 is provided with a first step 5, and the inner wall of the cylinder body 1 is provided with a cylinder body step 7 for blocking the first step 5.
The first piston 3 is fixedly connected with the piston rod 2 and used for driving the piston rod 2 to move.
The outer wall of the first piston 3 is provided with a second step 6, the vertical surface of the second step 6 is used for contacting with the end surface of the R end of the second piston 4, and the horizontal surface of the second step 6 contacts with the inner wall of the cylinder body 1. The first piston 3 and the second piston 4 are linked, and when moving to the end R, the first piston 3 is pushed by the second piston 4 in the axial direction, and when moving to the end L, the second piston 4 is pushed by the first piston 3 in the axial direction.
The piston positioning device can realize the basic functions of: when the L end is filled with air, the air pressure pushes the first piston 3 and the second piston 4 to move together, when the second piston 4 reaches the step of the cylinder block 1, the second piston 4 stops moving, the first piston 3 continues to move to the R end position, and the final state is shown in FIG. 2; when the end R is charged, the gas pressure pushes the first piston 3 and the second piston 4 to move together to the end L position, and the final state is as shown in fig. 1.
As shown in fig. 4, the L-end of the second piston 4 has an area of contact with the gas of S1, and S1 is a sectional area of the left side of the second piston 4; as shown in fig. 5, the L-end gas contact area of the first piston 3 is S2, S2 is the sum of the left side sectional area of the first piston 3 and the sectional area of the piston rod 2, as shown in fig. 6, the R-end gas contact area of the first piston 3 is S3, and S3 is the right side sectional area of the first piston 3. Designed as S1+ S2> S3, S2< S3.
When the L end and the R end are simultaneously charged (pressure is the same), as shown in fig. 1, when the initial positions of the first piston 3 and the second piston 4 are located in the L end area, since S1+ S2> S3, F1+ F2> F3, the first piston 3 and the second piston 4 move together toward the R end, and when the first step 5 of the second piston 4 reaches the cylinder step 7, the second piston 4 stops moving; at this time, the L-end urging force of the first piston 3 is F2, and the R-end urging force acting on the first piston 3 is F3. Since S2< S3, F2< F3, the first piston 3 cannot continue to move toward the R end. When the piston tends to move towards the L end, the piston has F1+ F2> F3, so that the piston cannot move towards the L end continuously. As shown in fig. 3, the first piston 3 and the second piston 4 will be stably stopped at the step of the cylinder block 1 at this time.
As shown in fig. 2, when the initial position of the first piston 3 is at the R end, both ends of the cylinder block 1 are simultaneously charged (the pressures are the same), F2< F3 due to S2< S3, and the first piston 3 moves to the L end, and when the second step 6 surface of the first piston 3 contacts the second piston 4, and at this time, F1+ F2> F3 due to S1+ S2> S3, the first piston 3 cannot push the second piston 4 to move together to the L end, and both pistons stop at the positions shown in fig. 3. It can therefore be concluded that with this mechanical construction, the piston can stay fixed in a certain set position when the cylinder block 1 is simultaneously charged at both ends.
The utility model discloses a simple mechanical mechanism, through adopting split type piston, utilize the principle of pressure difference, when giving certain atmospheric pressure simultaneously at the piston both ends, alright make the piston fix in certain selected position and cylinder body step 7 department promptly.
As shown in fig. 2, a first groove 8 is formed in the outer wall of the first piston 3 in contact with the second piston 4, and a second groove 9 and a third groove 10 are formed in the horizontal plane of the second step 6. The outer wall of the second piston 4 is provided with a fourth groove 11. And a wear-resistant ring is arranged in the second groove 9 and plays a role of supporting the cylinder. And sealing rings 12 are arranged in the other grooves to play a role of sealing gas.
The working method of the cylinder piston positioning device comprises the following working states:
when the L end of the cylinder body 1 enters air, the air pressure pushes the first piston 3 and the second piston 4 to move together, when the first step 5 of the second piston 4 reaches the position of the cylinder body step 7, the first step 5 is blocked by the cylinder body step 7, the second piston 4 stops moving, and the first piston 3 continues to move to the R end position;
when the R end of the cylinder block 1 is charged, the gas pressure pushes the first piston 3 and the second piston 4 to move together to the L end position;
when air is simultaneously supplied to both ends of the cylinder block 1 and the pressures are equal, the first piston 3 and the second piston 4 stay at a certain set position.
When the structure can be applied to an AMT (automated mechanical transmission) control actuating mechanism, the extending end of the piston rod 2 is connected with a gear shifting fork of a gearbox, the extreme positions of the L end and the R end of the piston represent two gears, the gearbox needs to be in neutral, and the step of the cylinder body 1 can represent the neutral position. In short, the mechanism can be used for returning the gears to the neutral position, i.e. to the neutral position, when the automatic gearbox is pneumatically controlled to shift gears.
Claims (9)
1. The cylinder piston positioning device is characterized by comprising a cylinder body and a piston rod (2), wherein one end of the piston rod (2) extends into the cylinder body, an air inlet end on one side of the cylinder body serves as an L end, and an air inlet end on the other side of the cylinder body serves as an R end;
a first piston (3) and a second piston (4) are arranged in the cylinder block, the first piston (3) is sleeved on the piston rod (2), and the second piston (4) is sleeved outside the first piston (3);
a first step (5) is arranged on the outer wall of the second piston (4), and a cylinder step (7) for blocking the first step (5) is arranged on the inner wall of the cylinder body;
the contact area of the L end of the second piston (4) and the gas is S1; the contact area between the L end of the first piston (3) and the gas is S2, and the contact area between the R end of the first piston (3) and the gas is S3; s1+ S2> S3, S2< S3.
2. A cylinder piston positioning device according to claim 1, characterized in that the first piston (3) is fixedly connected to the piston rod (2).
3. A cylinder piston positioning device according to claim 1, characterized in that the outer wall of the first piston (3) is provided with a second step (6), the vertical surface of the second step (6) being adapted to be in contact with the end surface of the R-end of the second piston (4), and the horizontal surface of the second step (6) being in contact with the inner wall of the cylinder block.
4. A cylinder piston positioning device according to claim 1, characterized in that a first groove (8) is made in the outer wall of the first piston (3) that is in contact with the second piston (4).
5. A cylinder piston positioning device according to claim 4, characterized in that a sealing ring (12) is mounted in the first groove (8).
6. A cylinder piston positioning device according to claim 4, characterized in that a second groove (9) and a third groove (10) are also made on the outer wall of the first piston (3).
7. A cylinder piston positioning device according to claim 6, characterized in that a wear ring is mounted in the second recess (9) and a sealing ring (12) is mounted in the third recess (10).
8. A cylinder piston positioning device according to claim 1, characterized in that the second piston (4) has a fourth groove (11) in its outer wall, and a sealing ring (12) is mounted in the fourth groove (11).
9. A gearbox with a cylinder piston positioning device according to any of claims 1-8, characterised in that the protruding end of the piston rod (2) is connected to a gear shift fork of the gearbox.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020952495.9U CN212536305U (en) | 2020-05-29 | 2020-05-29 | Cylinder piston positioning device and gearbox with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020952495.9U CN212536305U (en) | 2020-05-29 | 2020-05-29 | Cylinder piston positioning device and gearbox with same |
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| Publication Number | Publication Date |
|---|---|
| CN212536305U true CN212536305U (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020952495.9U Active CN212536305U (en) | 2020-05-29 | 2020-05-29 | Cylinder piston positioning device and gearbox with same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700853A (en) * | 2021-09-07 | 2021-11-26 | 潍柴雷沃重工股份有限公司 | Tractor synchronizer gear shifting oil cylinder, gear shifting method and tractor |
| CN114033849A (en) * | 2021-11-04 | 2022-02-11 | 陕西法士特齿轮有限责任公司 | Multi-piston cylinder structure capable of being detached on single side |
-
2020
- 2020-05-29 CN CN202020952495.9U patent/CN212536305U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113700853A (en) * | 2021-09-07 | 2021-11-26 | 潍柴雷沃重工股份有限公司 | Tractor synchronizer gear shifting oil cylinder, gear shifting method and tractor |
| CN113700853B (en) * | 2021-09-07 | 2023-02-17 | 潍柴雷沃智慧农业科技股份有限公司 | Tractor synchronizer gear shifting oil cylinder, gear shifting method and tractor |
| CN114033849A (en) * | 2021-11-04 | 2022-02-11 | 陕西法士特齿轮有限责任公司 | Multi-piston cylinder structure capable of being detached on single side |
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