Cab overturning hydraulic cylinder

Abstract

The cab overturning hydraulic cylinder comprises a cylinder barrel, a piston rod assembly and a valve seat, the piston rod assembly comprises a piston and a piston rod, the piston divides an inner cavity of the cylinder barrel into an upper oil cavity and a lower oil cavity in a sealed mode, a first oil channel and a second oil channel which are arranged in an isolated mode are arranged in the valve seat, and one end of the first oil channel is communicated with an oil tank. One end of the first oil duct is communicated with the upper oil cavity, the other end of the first oil duct is communicated with the lower oil cavity, a first valve port and a first pressure limiting assembly arranged at the first valve port are arranged in the first oil duct, and the oil return pressure of hydraulic oil in the lower oil cavity is limited through the first pressure limiting assembly; the other end of the second oil channel is communicated with the oil pipe, a second valve port and a second pressure limiting assembly arranged at the second valve port are arranged in the second oil channel, the oil return pressure of the hydraulic oil in the upper oil cavity is limited through the second pressure limiting assembly, the good anti-explosion effect is achieved, and the working safety of the cab is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tilting hydraulic cylinders, in particular to a cab tilting hydraulic cylinder. Background Art

[0002] The hydraulic tilting mechanism of the cab is powered by hydraulic pressure. Through the extension and retraction of the hydraulic cylinder, the cab is rotated within a limited range around the tilting axis, thereby completing the lifting and lowering of the cab. The tilting cylinder assembly is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It has a simple structure and reliable operation. When using it to achieve the flipping of the cab, the deceleration device can be eliminated and there is no transmission gap. Therefore, it is widely loved by people in the automotive industry.

[0003] However, the existing tilting hydraulic cylinder still has the following technical problems:

[0004] 1. The piston rod in the tilting hydraulic cylinder extends and retracts too quickly, and accordingly the cab flips and resets at a fast speed, resulting in unstable flipping and reset of the cab and poor safety.

[0005] 2. The guide sleeve at the front end of the cylinder body of the flip hydraulic cylinder has poor assembly stability. When the piston rod moves, the guide sleeve has a slight movement, which affects the movement of the piston rod. Summary of the Invention

[0006] The purpose of the utility model is to provide a cab-turning hydraulic cylinder, which, through the arrangement of a first pressure-limiting component and a second pressure-limiting component, can prevent the cab from turning over or returning to its original position too quickly, and at the same time has a good explosion-proof effect, thereby effectively improving the working safety of the cab.

[0007] The above-mentioned technical objectives of the present utility model are achieved through the following technical solutions: A cab tilting hydraulic cylinder includes a cylinder barrel, a piston rod assembly slidably arranged in the cylinder barrel, and a valve seat fixed to the bottom of the cylinder barrel, the piston rod assembly includes a piston and a piston rod fixedly connected to the piston, the piston seals and divides the inner chamber of the cylinder barrel into an upper oil chamber and a lower oil chamber, a first oil channel and a second oil channel arranged in isolation are provided in the valve seat, one end of the first oil channel is connected to the oil tank, and the other end of the first oil channel is connected to the lower oil chamber, a first valve port and a first pressure limiting assembly arranged at the first valve port are provided in the first oil channel, and the return oil pressure of the hydraulic oil in the lower oil chamber is limited by the first pressure limiting assembly, an oil pipe for connecting the upper oil chamber and the second oil channel is connected to the outside of the cylinder barrel, one end of the second oil channel is connected to the oil tank, and the other end of the second oil channel is connected to the oil pipe, a second valve port and a second pressure limiting assembly arranged at the second valve port are provided in the second oil channel, and the return oil pressure of the hydraulic oil in the upper oil chamber is limited by the second pressure limiting assembly.

[0008] Furthermore, the first pressure limiting component includes a first blocking ball, a first elastic part A and a first elastic part B arranged on both sides of the first blocking ball, the first elastic part A provides an elastic force for the first blocking ball to move toward the side of blocking the first valve port, and the first elastic part B provides an elastic force for the first blocking ball to move toward the side of opening the first valve port. When the return oil pressure of the hydraulic oil in the lower oil chamber is greater than the set maximum return oil pressure, the first blocking ball will block the first valve port under the action of the oil pressure of the hydraulic oil and the first elastic part A.

[0009] Furthermore, the first oil channel includes oil channel a, oil channel b and oil channel c, one end of oil channel a is connected to the oil tank, the other end of oil channel a is connected to oil channel b through the first valve port, the other end of oil channel b is provided with a first sealing plug, one end of oil channel c is connected to oil channel b, and the other end of oil channel c is connected to the lower oil chamber, the first elastic member A is abutted between the first sealing plug and the first blocking ball, a first abutting block is provided in the oil channel a, one end of the first elastic member B is abutted against the first blocking ball, the other end of the first elastic member B is abutted against the first abutting block, and a first oil hole is provided in the middle of the first abutting block.

[0010] Furthermore, a first filter is fixedly mounted on a side of the first oil channel adjacent to the oil tank.

[0011] Furthermore, the second pressure limiting assembly includes a second blocking ball, a second elastic part A and a second elastic part B arranged on both sides of the second blocking ball, the second elastic part A provides elastic force for the second blocking ball to move toward the side of blocking the second valve port, and the second elastic part B provides elastic force for the second blocking ball to move toward the side of opening the second valve port. When the return oil pressure of the hydraulic oil in the upper oil chamber is greater than the set maximum return oil pressure, the second blocking ball will block the second valve port under the action of the oil pressure of the hydraulic oil and the second elastic part A.

[0012] Furthermore, the second oil channel includes oil channel d, oil channel e and oil channel f, one end of oil channel d is connected to the oil tank, the other end of oil channel d is connected to oil channel e through the second valve port, the other end of oil channel e is provided with a second sealing plug, one end of oil channel f is connected to oil channel e, the other end of oil channel f is connected to the upper oil chamber, the second elastic member A is abutted between the second sealing plug and the second plug ball, a second abutting block is provided in the oil channel d, one end of the second elastic member B is abutted against the second plug ball, the other end of the second elastic member B is abutted against the second abutting block, and a second oil hole is provided in the middle of the second abutting block.

[0013] Furthermore, a second filter is fixedly mounted on a side of the second oil passage adjacent to the oil tank.

[0014] Furthermore, an inner ring groove is provided at the front end of the cylinder, and a guide sleeve is installed at the front end of the cylinder. An outer ring groove is recessed at the position of the guide sleeve corresponding to the inner ring groove, and a limiting snap ring is provided between the outer ring groove and the inner ring groove to limit the axial movement of the guide sleeve.

[0015] Furthermore, the cross section of the outer ring groove is an arc structure, and the central angle of the arc structure is x, wherein 110°≤x≤125°.

[0016] Furthermore, sealing rings are provided between the guide sleeve and the cylinder barrel, and between the guide sleeve and the piston rod.

[0017] In summary, the present invention has the following beneficial effects:

[0018] The cab-turning hydraulic cylinder of the utility model can prevent the cab from turning over or returning to its original position too quickly through the arrangement of the first pressure-limiting component and the second pressure-limiting component, and at the same time has a good explosion-proof effect, thereby effectively improving the working safety of the cab. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0020] Figure 2 This utility model Figure 1 Cross-sectional view at point A.

[0021] Figure 3 It is a cross-sectional view of the present utility model.

[0022] Figure 4 This utility model Figure 3 Enlarged view of point B.

[0023] Figure 5 This utility model Figure 3 Enlarged view of point C.

[0024] Figure 6 It is a principle diagram of the present utility model.

[0025] In the figure: 10, cylinder; 11, upper oil chamber; 12, lower oil chamber; 13, inner ring groove; 20, piston rod assembly; 21, piston; 22, piston rod; 30, valve seat; 31, first oil channel; 311, first valve port; 312, oil channel a; 313, oil channel b; 314, oil channel c; 32, second oil channel; 321, second valve port; 322, oil channel d; 323, oil channel e; 324, oil channel f; 33, first pressure limiting assembly; 331, first Ball blocking; 332, first elastic member A; 333, first elastic member B; 334, first sealing plug; 335, first abutment block; 336, first filter element; 34, second pressure-limiting assembly; 341, second ball blocking; 342, second elastic member A; 343, second elastic member B; 344, second sealing plug; 345, second abutment block; 346, second filter element; 40, oil pipe; 50, guide sleeve; 51, outer ring groove; 52, limiting clamp. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1-6 As shown, a cab tilting hydraulic cylinder includes a cylinder 10, a piston rod assembly 20 slidably arranged in the cylinder 10, and a valve seat 30 fixed to the bottom of the cylinder 10, which constitute the technical structure of the present invention.

[0028] The piston rod assembly 20 includes a piston 21 and a piston rod 22 fixedly connected to the piston 21. The piston 21 seals and separates the inner chamber of the cylinder 10 into an upper oil chamber 11 and a lower oil chamber 12. The valve seat 30 is provided with a first oil passage 31 and a second oil passage 32 that are isolated and arranged. One end of the first oil passage 31 is connected to the oil tank, and the other end of the first oil passage 31 is connected to the lower oil chamber 12. The first oil passage 31 is provided with a first valve port 311 and a first pressure limiting component 33 arranged at the first valve port 311. The first pressure limiting component 33 limits the liquid in the lower oil chamber 12 The return oil pressure of the pressurized oil is increased, thereby effectively limiting the return oil speed of the hydraulic oil in the lower oil chamber 12. The cylinder 10 is externally connected with an oil pipe 40 for connecting the upper oil chamber 11 and the second oil channel 32. One end of the second oil channel 32 is connected to the oil tank, and the other end of the second oil channel 32 is connected to the oil pipe 40. A second valve port 321 and a second pressure limiting component 34 arranged at the second valve port 321 are provided in the second oil channel 32. The return oil pressure of the hydraulic oil in the upper oil chamber 11 is limited by the second pressure limiting component 34, thereby effectively limiting the return oil speed of the hydraulic oil in the upper oil chamber 11.

[0029] The cab-turning hydraulic cylinder of the present invention can prevent the cab from turning over or returning to its original position too quickly by providing the first pressure-limiting component 33 and the second pressure-limiting component 34, and at the same time has a good explosion-proof effect, thereby effectively improving the working safety of the cab.

[0030] In some embodiments, the first pressure limiting assembly 33 includes a first blocking ball 331, a first elastic member A332 and a first elastic member B333 arranged on both sides of the first blocking ball 331, the first elastic member A332 provides elastic force for the first blocking ball 331 to move toward the side of blocking the first valve port 311, and the first elastic member B333 provides elastic force for the first blocking ball 331 to move toward the side of opening the first valve port 311. When the return oil pressure of the hydraulic oil in the lower oil chamber 12 is greater than the set maximum return oil pressure, the first blocking ball 331 will block the first valve port 311 under the action of the oil pressure of the hydraulic oil and the first elastic member A332. When the oil tank passes oil to the first oil channel 31, the first blocking ball 331 will open the first valve port 311 under the action of the hydraulic oil pressure and the elastic force of the first elastic member B333, so that the hydraulic oil in the oil tank enters the lower oil chamber 12.

[0031] Furthermore, the first oil passage 31 includes an oil passage a312, an oil passage b313 and an oil passage c314. One end of the oil passage a312 is connected to the oil tank, and the other end of the oil passage a312 is connected to the oil passage b313 through the first valve port 311. Specifically, the diameter of the first valve port 311 is smaller than the diameters of the oil passages a312 and b313. The other end of the oil passage b313 is provided with a first sealing plug 334. One end of the oil passage c314 is connected to the oil passage b313, and the other end of the oil passage c314 is connected to the lower oil chamber 12. The first elastic member A332 is abutted between the first sealing plug 334 and the first blocking ball 331. A first abutting block 335 is provided in the oil passage a312. One end of the first elastic member B333 is abutted against the first blocking ball 331, and the other end of the first elastic member B333 is abutted against the first abutting block 335. A first oil hole is provided in the middle of the first abutting block 335.

[0032] In some embodiments, a first filter element 336 is fixedly installed on a side of the first oil channel 31 adjacent to the oil tank. Specifically, a first step is provided on a side of the first oil channel 31 adjacent to the oil tank, and the outer periphery of the first filter element 336 is fixed to the first step of the first oil channel 31 with a wire retaining ring through a hole.

[0033] In some embodiments, the second pressure limiting assembly 34 includes a second blocking ball 341, a second elastic member A342 and a second elastic member B343 arranged on both sides of the second blocking ball 341, the second elastic member A342 provides the second blocking ball 341 with an elastic force to move toward the side of blocking the second valve port 321, and the second elastic member B343 provides the second blocking ball 341 with an elastic force to move toward the side of opening the second valve port 321. When the return oil pressure of the hydraulic oil in the upper oil chamber 11 is greater than the set maximum return oil pressure, the second blocking ball 341 will block the second valve port 321 under the action of the oil pressure of the hydraulic oil and the second elastic member A342. When the oil tank passes oil to the second oil channel 32, the second blocking ball 341 will open the second valve port 321 under the action of the hydraulic oil pressure and the elastic force of the second elastic member B343, so that the hydraulic oil in the oil tank enters the upper oil chamber 11.

[0034] Furthermore, the second oil passage 32 includes an oil passage d322, an oil passage e323 and an oil passage f324. One end of the oil passage d322 is connected to the oil tank, and the other end of the oil passage d322 is connected to the oil passage e323 through the second valve port 321. Specifically, the diameter of the second valve port 321 is smaller than the diameters of the oil passage d322 and the oil passage e323. A second sealing plug 344 is provided at the other end of the oil passage e323. One end of the oil passage f324 is connected to the oil passage e323, and the other end of the oil passage f324 is connected to the upper oil chamber 11. The second elastic member A342 is abutted between the second sealing plug 344 and the second blocking ball 341. A second abutting block 345 is provided in the oil passage d322. One end of the second elastic member B343 is abutted against the second blocking ball 341, and the other end of the second elastic member B343 is abutted against the second abutting block 345. A second oil hole is provided in the middle of the second abutting block 345.

[0035] Furthermore, a second filter element 346 is fixedly installed on the side of the second oil channel 32 adjacent to the oil tank. Specifically, a second step is provided on the side of the second oil channel 32 adjacent to the oil tank, and the outer periphery of the second filter element 346 is fixed to the second step of the second oil channel 32 with a wire retaining ring through a hole.

[0036] In some embodiments, an inner ring groove 13 is provided at the front end of the cylinder 10, and stop portions are provided on both sides of the inner ring groove 13. A guide sleeve 50 is installed at the front end of the cylinder 10, and an outer ring groove 51 is recessed at the position of the guide sleeve 50 corresponding to the inner ring groove 13. A limiting snap ring 52 is provided between the outer ring groove 51 and the inner ring groove 13. The axial movement of the limiting snap ring 52 is limited by the stop portions on both sides of the inner ring groove 13, and the axial movement of the guide sleeve 50 is limited by the limiting snap ring 52.

[0037] Furthermore, the cross-section of the outer ring groove 51 is an arc structure, and the central angle of the arc structure is x, where 110°≤x≤125°. The axial movement of the guide sleeve 50 is limited by the limiting coupling of the limiting snap ring 52 and the outer ring groove 51 of the guide sleeve 50.

[0038] Furthermore, sealing rings are respectively provided between the guide sleeve 50 and the cylinder barrel 10 and between the guide sleeve 50 and the piston rod 22, and the sealing rings play a sealing role.

[0039] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A cab tilting hydraulic cylinder, comprising a cylinder barrel (10), a piston rod assembly (20) slidably disposed in the cylinder barrel (10), and a valve seat (30) fixed to the bottom of the cylinder barrel (10), wherein the piston rod assembly (20) comprises a piston (21) and a piston rod (22) fixedly connected to the piston (21), wherein the piston (21) seals and separates the inner chamber of the cylinder barrel (10) into an upper oil chamber (11) and a lower oil chamber (12), and is characterized in that: The valve seat (30) is provided with a first oil passage (31) and a second oil passage (32) which are isolated from each other. One end of the first oil passage (31) is connected to the oil tank, and the other end of the first oil passage (31) is connected to the lower oil chamber (12). The first oil passage (31) is provided with a first valve port (311) and a first pressure limiting component (33) arranged at the first valve port (311). The return oil pressure of the hydraulic oil in the lower oil chamber (12) is limited by the first pressure limiting component (33). The cylinder (10) is externally connected to an oil pipe (40) for connecting the upper oil chamber (11) and the second oil passage (32). One end of the second oil passage (32) is connected to the oil tank, and the other end of the second oil passage (32) is connected to the oil pipe (40). A second valve port (321) and a second pressure limiting component (34) arranged at the second valve port (321) are provided in the second oil passage (32). The return oil pressure of the hydraulic oil in the upper oil chamber (11) is limited by the second pressure limiting component (34).

2. The cab tilting hydraulic cylinder according to claim 1, characterized in that: The first pressure-limiting assembly (33) includes a first blocking ball (331), a first elastic member A (332) and a first elastic member B (333) arranged on both sides of the first blocking ball (331), wherein the first elastic member A (332) provides an elastic force for the first blocking ball (331) to move toward the side of blocking the first valve port (311), and the first elastic member B (333) provides an elastic force for the first blocking ball (331) to move toward the side of opening the first valve port (311). When the return oil pressure of the hydraulic oil in the lower oil chamber (12) is greater than the set maximum return oil pressure, the first blocking ball (331) will block the first valve port (311) under the action of the oil pressure of the hydraulic oil and the first elastic member A (332).

3. The cab tilting hydraulic cylinder according to claim 2, characterized in that: The first oil passage (31) includes an oil passage a (312), an oil passage b (313) and an oil passage c (314). One end of the oil passage a (312) is connected to the oil tank, and the other end of the oil passage a (312) is connected to the oil passage b (313) through the first valve port (311). The other end of the oil passage b (313) is provided with a first sealing plug (334). One end of the oil passage c (314) is connected to the oil passage b (313), and the other end of the oil passage c (314) is connected to the oil passage b (313). The end is connected to the lower oil chamber (12), the first elastic member A (332) is arranged between the first sealing plug (334) and the first blocking ball (331), a first abutting block (335) is arranged in the oil passage a (312), one end of the first elastic member B (333) is arranged against the first blocking ball (331), the other end of the first elastic member B (333) is arranged against the first abutting block (335), and a first oil hole is arranged in the middle of the first abutting block (335).

4. The cab tilting hydraulic cylinder according to claim 1, characterized in that: A first filter element (336) is fixedly mounted on one side of the first oil passage (31) adjacent to the oil tank.

5. The cab tilting hydraulic cylinder according to claim 1, characterized in that: The second pressure-limiting assembly (34) includes a second blocking ball (341), a second elastic member A (342) and a second elastic member B (343) arranged on both sides of the second blocking ball (341), the second elastic member A (342) provides elastic force for the second blocking ball (341) to move toward the side of blocking the second valve port (321), and the second elastic member B (343) provides elastic force for the second blocking ball (341) to move toward the side of opening the second valve port (321). When the return oil pressure of the hydraulic oil in the upper oil chamber (11) is greater than the set maximum return oil pressure, the second blocking ball (341) will block the second valve port (321) under the action of the oil pressure of the hydraulic oil and the second elastic member A (342).

6. The cab tilting hydraulic cylinder according to claim 5, characterized in that: The second oil passage (32) includes an oil passage d (322), an oil passage e (323) and an oil passage f (324). One end of the oil passage d (322) is connected to the oil tank, and the other end of the oil passage d (322) is connected to the oil passage e (323) through the second valve port (321). The other end of the oil passage e (323) is provided with a second sealing plug (344). One end of the oil passage f (324) is connected to the oil passage e (323), and the other end of the oil passage f (324) is connected to the oil passage e (323). The end is connected to the upper oil chamber (11), the second elastic member A (342) is arranged between the second sealing plug (344) and the second blocking ball (341), a second abutting block (345) is arranged in the oil passage d (322), one end of the second elastic member B (343) is arranged against the second blocking ball (341), the other end of the second elastic member B (343) is arranged against the second abutting block (345), and a second oil hole is arranged in the middle of the second abutting block (345).

7. The cab tilting hydraulic cylinder according to claim 1, characterized in that: A second filter element (346) is fixedly installed on one side of the second oil passage (32) adjacent to the oil tank.

8. The cab tilting hydraulic cylinder according to any one of claims 1 to 7, characterized in that: The front end of the cylinder barrel (10) is provided with an inner ring groove (13), and the front end of the cylinder barrel (10) is installed with a guide sleeve (50). The guide sleeve (50) is provided with an outer ring groove (51) at a position corresponding to the inner ring groove (13). A limiting snap ring (52) is provided between the outer ring groove (51) and the inner ring groove (13), and the axial movement of the guide sleeve (50) is limited by the limiting snap ring (52).

9. The cab tilting hydraulic cylinder according to claim 8, characterized in that: The cross section of the outer ring groove (51) is an arc structure, and the center angle of the arc structure is x, wherein 110°≤x≤125°.

10. The cab tilting hydraulic cylinder according to claim 8, characterized in that: Sealing rings are respectively provided between the guide sleeve (50) and the cylinder barrel (10), and between the guide sleeve (50) and the piston rod (22).

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