CN216764158U - Spring-driven double-layer piston oil cylinder - Google Patents

Abstract

A spring-driven double-layer piston oil cylinder belongs to the technical field of automobile parts. The utility model aims to provide a spring-lost double-layer piston oil cylinder which can basically avoid the problem of hydraulic cylinder loss by improving the internal structure of the hydraulic cylinder and adopting the elastic property of a spring. A piston rod is inserted into a cylinder body, a cab bottom shaft sleeve ring is fixedly mounted at the upper end of the piston rod, a vehicle body shaft sleeve ring is fixedly mounted at the bottom end of an oil way base, a limiting blocking ring is arranged in the middle of the piston rod extending into the cylinder body, the lower end of the piston rod extends into a piston, a piston rod end head matched with the inner diameter of the piston is arranged at the bottom end of the piston rod, a piston end cover matched with the outer diameter of the piston rod is arranged at the upper end of the piston, a buffer spring is arranged at the bottom inside the piston, and the piston is divided into an upper oil cavity and a lower oil cavity by the middle of the outer wall of the piston through a sealing ring. The utility model has simple structure and controllable damping force, and the damping force can adjust the rigidity of the spring according to the requirement; the problem of abnormal sound is solved, the damping force is reduced, and abnormal sound is avoided when the hydraulic cylinder drives a vehicle.

Description

Spring-driven double-layer piston oil cylinder

Technical Field

The utility model belongs to the technical field of automobile parts.

Background

The cab lifting hydraulic cylinder is a component which is commonly applied, and the principle of the cab lifting hydraulic cylinder is that oil is supplied to two ends of a piston in a cylinder body, so that the cab lifting or descending operation of the hydraulic cylinder is completed. The existing hydraulic rod is simple, namely a simple cylinder body, a piston is arranged in the cylinder body and connected with a piston rod to extend out of the cylinder body, the bottom end of the cylinder body is installed on an axle beam of a vehicle body, the extending end of the piston rod is installed on the axle beam at the bottom end of a cab, and the cylinder body and the piston rod can rotate by taking respective axle beams as axles. This structure, although simple, has a number of drawbacks, such as: 1. when the lifting is switched to the descending after the lifting, or the oil pressure at two ends of the piston is changed when the lifting is switched after the descending, so that the hydraulic cylinder and other parts are damaged frequently or dangers are caused after the hydraulic cylinder and other parts are damaged for a long time; 2. in the lifting process or the descending process, loss of movement is possibly caused due to imbalance of oil pressure, the loss of movement is extremely dangerous, and casualties can be caused sometimes; and so on. In any case, creating a loss of action is fundamentally very dangerous.

Disclosure of Invention

The utility model aims to provide a spring-lost double-layer piston oil cylinder which can basically avoid the problem of hydraulic cylinder loss by improving the internal structure of the hydraulic cylinder and adopting the elastic property of a spring.

A piston rod is inserted into a cylinder body, a cab bottom shaft sleeve ring is fixedly mounted at the upper end of the piston rod, a vehicle body shaft sleeve ring is fixedly mounted at the bottom end of an oil way base, a limiting blocking ring is arranged in the middle of the piston rod extending into the cylinder body, the lower end of the piston rod extends into a piston, a piston rod end head matched with the inner diameter of the piston is arranged at the bottom end of the piston rod, a piston end cover matched with the outer diameter of the piston rod is arranged at the upper end of the piston, a buffer spring is placed at the bottom inside the piston, and the middle part of the outer wall of the piston is divided into an upper oil cavity and a lower oil cavity through a sealing ring; oil circuit base inner structure and oil circuit: an oil inlet passage and an oil return passage which are communicated with an external oil tank are formed in the oil way base, the oil inlet passage is communicated with a first oil supply branch, the first oil supply branch is communicated with a second oil supply branch, the inner diameter of the second oil supply branch is larger than that of the first oil supply branch, a spherical oil seal is arranged at the communication position of the second oil supply branch and the first oil supply branch, one end of an oil pressure spring is propped against the inner wall of the oil way base, the other end of the oil pressure spring is propped against the bottom end of the spherical oil seal, and the second oil supply branch is communicated with the bottom end of a piston in the cylinder body through a third oil supply branch; the oil return passage is communicated with an oil return branch, the oil return branch is communicated with the upper end of the cylinder body through an oil return pipeline, the oil return branch is blocked by a sealing cap, the sealing cap is fixed on the oil circuit base, an oil return piston is arranged in the oil return branch, an oil return branch sealing ring is sleeved on the outer wall of the oil return piston, the oil return branch sealing ring divides the oil return branch into a front cavity of the oil return branch and a rear cavity of the oil return branch, the rear cavity of the oil return branch is communicated with the oil return branch, the front cavity of the oil return branch is communicated with the oil supply branch, and the front end of the oil return piston extends into the oil supply branch and a mandril corresponding to the spherical oil seal.

The double-oil hydraulic cylinder is simple in structure, and the problem that the machining process and the assembling process of the double-oil hydraulic cylinder are difficult is solved; the damping force is controllable, and the spring stiffness can be adjusted according to the requirement; the abnormal sound problem is solved, the damping force is reduced, and the abnormal sound generated by the hydraulic cylinder during driving is avoided; the diameter-expanding structure is not adopted, and the problem of damage to the sealing ring of the differential cylinder is solved; the volume is small and the weight is light; two wear-resisting rings are added to the piston to protect the sealing rings.

Drawings

FIG. 1 is a cross-sectional view of the overall construction of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1 in accordance with the present invention;

fig. 3 is a sectional view taken along line B-B of fig. 1 in accordance with the present invention.

Detailed Description

The improved structure of the oil circuit base 6 is characterized in that a piston rod 1 is inserted into a cylinder body 3, a cab bottom shaft lantern ring 2 is fixedly installed at the upper end of the piston rod 1, a vehicle body shaft lantern ring 5 is fixedly installed at the bottom end of the oil circuit base 6, the same structure of the existing cab lifting device is applied to the part and used for connecting the whole device with a cab and a vehicle body, the cab bottom shaft lantern ring 2 and the vehicle body shaft lantern ring 5 at the two ends of the whole device are respectively connected with shafts below the cab and on a vehicle frame body, the oil circuit base 6 also has original equipment, and the improved structure of the oil circuit base 6 is the internal structure of the cylinder body.

According to the utility model, the middle part of the piston rod 1 extending into the cylinder body 3 is provided with the limiting blocking ring 7, the limiting blocking ring 7 is a clamping ring, the limiting blocking ring 7 is the rising limit position of the piston rod 1, namely, the piston rod 1 extends out of the cylinder body 3, the blocking ring reaches the last position and cannot rise continuously, and the limiting blocking ring 7 can be used for setting the position for blocking and limiting according to the actual situation.

The lower end of the piston rod 1 extends into the piston 13, the bottom end of the piston rod 1 is provided with a piston rod end 9 matched with the inner diameter of the piston 13, the upper end of the piston 13 is provided with a piston end cover 12 matched with the outer diameter of the piston rod 1, and the piston rod 1 is prevented from being separated from the piston 13 through the matching of the piston rod end 9 and the piston end cover 12.

The buffer spring 10 is placed at the bottom inside the piston 13, the elastic force of the buffer spring 10 is used for solving the problem of loss of motion, sudden oil pressure conversion abnormity can not occur, and even if the oil pressure has the conversion abnormity, the oil pressure is absorbed through the spring in a buffering mode.

The middle part of the outer wall of the piston 13 divides the piston 13 into an upper oil chamber 8 and a lower oil chamber 14 through a sealing ring 11; the sealing ring 11 is used for blocking the upper oil chamber 8 (descending oil chamber) and the lower oil chamber 14 (ascending oil chamber) to be communicated, and the upper oil chamber 8 is simultaneously communicated with the outer oil chamber of the piston rod 1 in the cylinder body 3 (the part is collectively called as the upper oil chamber 8 in the utility model), so that the ascending oil chamber and the descending oil chamber are formed.

6 inner structure of oil circuit base and oil circuit: an oil inlet passage 25 and an oil return passage 22 which are communicated with an external oil tank are arranged on the oil way base 6, the oil inlet passage 25 is communicated with a first oil supply branch 18, the first oil supply branch 18 is communicated with a second oil supply branch 15, the inner diameter of the second oil supply branch 15 is larger than that of the first oil supply branch 18, a spherical oil seal 27 is arranged at the communication position of the second oil supply branch 15 and the first oil supply branch 18, one end of an oil pressure spring 28 is propped against the inner wall of the oil way base 6, the other end of the oil pressure spring is propped against the bottom end of the spherical oil seal 27, and the second oil supply branch 15 is communicated with the bottom end of a piston 13 in a cylinder body 3 through a third oil supply branch 17; the oil return passage 22 is communicated with a first oil return branch 26, the first oil return branch 26 is communicated with the upper end of the cylinder body 3 through an oil return pipeline 4, the first oil return branch 26 is plugged through a sealing cap 21, the sealing cap 21 is fixed on the oil way base 6, an oil return piston 20 is arranged in a second oil return branch 23, an oil return branch sealing ring 29 is sleeved on the outer wall of the oil return piston 20, the second oil return branch 23 is divided into a second oil return branch front cavity and a second oil return branch rear cavity by the oil return branch sealing ring 29, the second oil return branch rear cavity is communicated with the first oil return branch 26, the second oil return branch front cavity is communicated with the first oil supply branch 18, and the front end of the oil return piston 20 extends into the first oil supply branch 18 and is provided with a mandril 24 corresponding to the spherical oil seal 27. The oil circuit in the oil circuit base 6 is an oil supply passage for an oil cavity which is provided for the cylinder body 3 to ascend and descend, and the oil supply circuit for the oil cavity which ascends is as follows: the oil inlet passage 25, the first oil supply branch 18, the second oil supply branch 15 and the third oil supply branch 17 are finally sent into the lower oil cavity 14, at the moment, oil also exists in the second oil return branch 23, but is sealed by an oil return branch sealing ring 29 outside the oil return piston 20, and the first oil return branch 26 cannot be injected; the oil supply line of the oil cavity is as follows: the oil return passage 22, the first oil return branch 26 and the oil return pipeline 4 are finally injected into the upper oil cavity 8, the oil rising line is converted into an oil return passage, hydraulic oil is injected back into the oil tank, the oil return piston 20 in the first oil return branch 26 is moved to the first oil supply branch 18 while the upper oil cavity 8 is filled with oil, the spherical oil seal 27 is pushed open through the ejector rod 24, and therefore the oil which opens the lower oil cavity 14 finally returns to the oil tank through the oil inlet passage 25.

And (3) lifting process: hydraulic oil enters the first oil supply branch 18 through the oil inlet passage 25 to push the spherical oil seal 27 open, the hydraulic spring 28 is compressed, the hydraulic oil enters the lower oil chamber 14 of the hydraulic cylinder along the third oil supply branch 17 from the second oil supply branch 15 to push the piston 13 to move upwards, the buffer spring 10 is compressed, when the buffer spring 10 is compressed to the limit position, the hydraulic oil can form rigid contact with the piston 1 and the piston 13 until no relative movement with the end 9 of the piston rod exists, the piston 13 and the piston rod 1 coordinate the piston 13 and the buffer spring 10 to move upwards together, the hydraulic oil in the upper oil chamber 8 enters the first oil return branch 26 through the oil return pipeline 4 and flows back to the manual pump shell along the oil return passage 22, when the cab is overturned too heavy, the buffer spring 10 is released under the action of elasticity, the piston rod 1 and the piston 13 can move relatively until the piston end cover 12 contacts with the end 9 of the piston rod, spacing separation ring 7 on the piston rod 1 contacts with the uide bushing, realizes limit function, and the pneumatic cylinder lifts to the maximum position, and the pneumatic cylinder realizes lifting.

And (3) a fall-back process: hydraulic oil enters a first oil return branch 26 through an oil passage 22 to push an oil return piston 20, a spherical oil seal 27 is pushed, an oil pressure spring 28 is compressed, a third oil supply branch 17 is communicated with a first oil supply branch 18, the hydraulic oil enters an upper oil cavity 8 through an oil return pipeline 4 to push the piston 13 to move downwards, the piston 13 is fixedly connected with a piston end cover 12, the piston end cover 12 can drive a piston rod end head 9 on a piston rod 1 to move downwards, the compressed buffer spring 10 can be released to cause the piston rod 1 and the piston 13 to move relatively until the piston end cover 12 is contacted with the piston rod end head 9, when the hydraulic cylinder starts to perform a return movement, the hydraulic oil in a lower oil cavity 14 of the hydraulic cylinder returns to a manual pump shell along the first oil supply branch 18 and an oil inlet passage 25 through the third oil supply branch 17, the hydraulic cylinder descends, and when a cab returns from the center of gravity, the instantaneous impact effect of the cab is reduced through the compression of the buffer spring 10, guarantee that the driver's cabin can be in steadily and fall back, need descend piston 13 to the pneumatic cylinder bottommost when the driver's cabin falls back simultaneously, guarantee that the pneumatic cylinder can guarantee to have sufficient when losing the action next.

The process of mourning: when the pneumatic cylinder is in the vehicle of normally traveling, because the damping effect of driver's cabin, the pneumatic cylinder can be in and lose the dynamic state, piston rod 1 can be followed driver's cabin bottom shaft lantern ring 2 reciprocating motion in cylinder body 3, because the unable pneumatic cylinder that supplements of pneumatic cylinder lower oil pocket 14, lead to piston 13 unable motion, piston rod 1 and piston rod end 9 will carry out reciprocating motion from top to bottom in piston 13, can carry out reciprocating compression and release with buffer spring 10 in piston 13, whole process buffer spring 10's rigidity will be less than the gasbag damping force of whole car, guarantee that the pneumatic cylinder can follow the motion of whole car. Simultaneously, for guaranteeing that the pneumatic cylinder normally loses the function, the hand pump need use tribit two to lead to the switching-over structure, except lifting, falling back, need increase the driving state, and during the driving state, the hand pump need will lift the hydraulic fluid port and seal up, avoids the piston to shift up, descends the hydraulic fluid port and needs and casing UNICOM, realizes the epicoele and inhales oil and arrange oil.

Claims (1)

1. The utility model provides a spring loses double-deck piston cylinder, and piston rod (1) are inserted in cylinder body (3), and piston rod (1) upper end fixed mounting has a driver's cabin bottom shaft lantern ring (2), and the bottom fixed mounting of oil circuit base (6) has car body axle lantern ring (5), its characterized in that: a limiting blocking ring (7) is arranged in the middle of the piston rod (1) extending into the cylinder body (3), the lower end of the piston rod (1) extends into the piston (13), a piston rod end (9) matched with the inner diameter of the piston (13) is arranged at the bottom end of the piston rod (1), a piston end cover (12) matched with the outer diameter of the piston rod (1) is arranged at the upper end of the piston (13), a buffer spring (10) is placed at the bottom inside the piston (13), and the middle of the outer wall of the piston (13) divides the piston (13) into an upper oil cavity (8) and a lower oil cavity (14) through a sealing ring (11); oil circuit base (6) inner structure and oil circuit: an oil inlet passage (25) and an oil return passage (22) which are communicated with an external oil tank are formed in the oil way base (6), the oil inlet passage (25) is communicated with a first oil supply branch (18), the first oil supply branch (18) is communicated with a second oil supply branch (15), the inner diameter of the second oil supply branch (15) is larger than that of the first oil supply branch (18), a spherical oil seal (27) is arranged at the communication position of the second oil supply branch (15) and the first oil supply branch (18), one end of an oil pressure spring (28) is propped against the inner wall of the oil way base (6), the other end of the oil pressure spring is propped against the bottom end of the spherical oil seal (27), and the second oil supply branch (15) is communicated with the bottom end of a piston (13) in the cylinder body (3) through a third oil supply branch (17); the oil return passage (22) is communicated with the first oil return branch (26), the first oil return branch (26) is communicated with the upper end of the cylinder body (3) through an oil return pipeline (4), the first oil return branch (26) is plugged through a sealing cap (21), the sealing cap (21) is fixed on the oil way base (6), an oil return piston (20) is arranged in the second oil return branch (23), an oil return branch sealing ring (29) is sleeved on the outer wall of the oil return piston (20), the second oil return branch (23) is divided into a second oil return branch front cavity and a second oil return branch rear cavity by the oil return branch sealing ring (29), the second oil return branch rear cavity is communicated with the first oil return branch (26), the second oil return branch front cavity is communicated with the first oil supply branch (18), and the front end of the oil return piston (20) extends into the first oil supply branch (18) and is provided with a push rod (24) corresponding to the spherical oil seal (27).

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