Suspension oil cylinder and vehicle

Abstract

The suspension oil cylinder comprises a cylinder body, a piston rod, a piston, a limiting assembly and a sealing assembly, the limiting assembly comprises an inner hole step structure arranged at the end of the piston rod and a limiting step extending out of the cylinder bottom of the cylinder body, a baffle is arranged on the limiting step, the baffle abuts against the inner hole step structure to form limiting, and the sealing assembly is arranged on the piston rod. The piston rod is provided with a guide assembly, and the sealing assembly is suitable for sealing lubricating oil injected into the guide assembly to continuously lubricate the guide assembly and the piston rod. The limiting step extending from the bottom of the cylinder body is matched with the step structure of the inner hole of the piston rod, so that the piston rod can be prevented from falling off through the limiting step when the piston rod reciprocates in the cylinder body; and the baffle on the limiting step is arranged in the cylinder body, and the situation that the piston directly collides with the guide assembly in the reciprocating motion process in the cylinder body, so that the piston and the guide assembly generate large deformation, and the sealing effect in the cylinder body is affected can be avoided through the baffle.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a suspension oil cylinder and a vehicle equipped with the same. Background Art

[0002] The actual working road surface of mining trucks is relatively rough, with many potholes, and its loading and transportation volume is large, which has a great impact on the suspension system. Among them, the suspension oil cylinder is the main bearing component. The suspension oil cylinder should ensure that the impact and vibration of the cab are reduced when driving on rough roads. The impact and vibration are mainly borne and consumed by the structure and seal of the suspension oil cylinder. Therefore, the impact and vibration have a greater impact on the service life of the suspension oil cylinder, mainly reflected in that the impact and vibration generate high temperature and high pressure, which cause greater damage to the structure and seal.

[0003] After the current suspension oil cylinder works for a long time, the stress on the piston and the guide ring of the guide sleeve inside it is greater closer to the front end, and it is more likely to be damaged. Among the multiple guide rings provided, the first guide ring often fails first, which leads to a decrease in the overall bearing capacity. The subsequent guide rings are quickly damaged due to the large load they bear, resulting in the failure of the oil cylinder; in addition, the piston directly impacts the guide sleeve, but the direct impact of the piston on the guide sleeve will cause large deformations in both the piston and the guide sleeve, affecting the use of the sealing ring and accelerating the failure of the sealing ring; and most of the sealing structures of the suspension oil cylinder adopt a combination of a dust ring + a Gleason ring + a U-ring + a guide ring. This combined sealing structure is simple, but the force on the guide ring is uneven, resulting in the easier failure of the sealing structure.

[0004] In view of this, it is necessary to design a suspension oil cylinder to solve the above problems. Summary of the Utility Model

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art.

[0006] Therefore, the utility model provides a suspension oil cylinder, which can limit the piston rod in the cylinder body, prevent the piston rod from being completely pulled out, and can better bear the lateral force during the working process, and the overall force-bearing performance is better.

[0007] According to a suspension oil cylinder provided by the first aspect of the utility model, it includes a cylinder body, a piston rod, a piston, a limiting component and a sealing component, wherein:

[0008] The limiting component includes an inner hole step structure of the piston rod and a limiting step extending from the bottom of the cylinder body of the cylinder body. A baffle is provided on the limiting step, and the baffle is adapted to abut against the inner hole step structure to form a limit;

[0009] A guiding assembly is further provided on the piston rod. The guiding assembly is adapted to seal the lubricating oil injected therein via the sealing assembly to continuously lubricate the guiding assembly and the piston rod.

[0010] Preferably, the limiting step includes a first step section and a second step section. The baffle is arranged on the first step section via a fixing nut and abuts against the second step section.

[0011] More preferably, a threaded structure is provided at the end of the first step section. The fixing nut is preliminarily fixed on the first step section via the threaded structure, and pin holes are provided on both the fixing nut and the first step section. A cylindrical pin is adapted to be embedded in the pin holes so as to lock the fixing nut on the first step section via the cylindrical pin.

[0012] Preferably, the guiding assembly includes a guiding sleeve. The guiding sleeve is arranged at the open end of the cylinder block. A sealing assembly is further provided on the guiding sleeve. The sealing assembly includes a dust cover and a dust ring. The dust cover is arranged at the open end of the cylinder block. The dust ring is arranged between the guiding sleeve and the piston rod and is close to the open end of the cylinder block.

[0013] More preferably, the guiding assembly includes a first guiding ring and a second guiding ring arranged between the guiding sleeve and the piston rod, and a third guiding ring arranged between the piston and the cylinder block. The first guiding ring, the second guiding ring and the third guiding ring are all arranged along the axial direction of the piston rod, and spiral grooves are provided in the inner circles of the first guiding ring and the second guiding ring. Lubricating oil is adapted to flow through the spiral grooves.

[0014] Preferably, an oil inlet is provided on the cylinder block. An oil filling cup is provided at the oil inlet. An oil inlet cavity is provided between the guiding sleeve and the cylinder block. The oil inlet is adapted to communicate with the oil inlet cavity. A lubricating cavity is provided between the guiding sleeve and the piston rod. The oil inlet cavity is adapted to communicate with the lubricating cavity. The first guiding ring is arranged in the lubricating cavity so as to be able to separately pour lubricating oil into the spiral groove of the first guiding ring via the oil filling cup.

[0015] More preferably, an oil outlet is provided on the cylinder block. An oil discharging cup is provided at the oil outlet. An oil outlet cavity is further provided between the guiding sleeve and the cylinder block. The oil outlet cavity is adapted to communicate with the lubricating cavity to guide the lubricating oil in the lubricating cavity to flow out via the oil discharging cup.

[0016] Preferably, the sealing assembly further includes first sealing rings respectively arranged at both ends of the first guiding ring. The first sealing rings are adapted to seal the lubricating cavity to limit the axial flow of the lubricating oil poured in the lubricating cavity along the piston rod.

[0017] Further preferably, the sealing assembly further includes a second sealing ring, a rod sealing ring and a snap ring disposed between the first guide ring and the second guide ring. The second sealing ring is disposed close to the second guide ring, the snap ring is disposed close to the first guide ring, and the rod sealing ring is disposed between the second sealing ring and the snap ring.

[0018] In a first aspect of the present invention, there is also provided a vehicle employing any one of the above-mentioned suspension cylinders.

[0019] The beneficial effects of the present invention are as follows: The limiting step extended from the bottom of the cylinder block cooperates with the inner hole step structure of the piston rod, so that during the reciprocating movement of the piston rod in the cylinder block, the piston rod can be restricted from coming out through the limiting step; and the baffle on the limiting step is disposed inside the cylinder block, and through the setting of the baffle, it can be avoided that the piston directly impacts the guiding assembly during the reciprocating movement in the cylinder block, thereby causing large deformations of both and affecting the sealing effect inside the cylinder block.

[0020] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification, the claims and the drawings.

[0021] To make the above objectives, features and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0022] The present invention will be further described below in conjunction with the drawings and embodiments.

[0023] Figure 1 It is a cross-sectional view of the suspension cylinder of the present invention;

[0024] Figure 2 It is an enlarged view of part A of the suspension cylinder of the present invention;

[0025] Figure 3 It is an enlarged view of part B of the suspension cylinder of the present invention;

[0026] Figure 4 It is a three-dimensional view of the first guide ring of the suspension cylinder of the present invention.

[0027] Description of the Reference Numerals:

[0028] 1. Cylinder block; 11. Oil inlet; 12. Oil filling cup; 13. Oil outlet; 14. Oil drain cup; 15. Oil inlet cavity; 16. Lubrication cavity; 17. Oil outlet cavity;

[0029] 2. Piston rod; 21. Inner hole step structure; 22. Piston;

[0030] 3. Limit component; 31. Limit step; 311. First step section; 312. Second step section; 32. Baffle; 33. Fixing nut; 34. Pin hole; 35. Cylindrical pin;

[0031] 4. Sealing component; 41. Dust cover; 42. Dust seal ring; 43. First sealing ring; 44. Second sealing ring; 45. Rod sealing ring; 46. Snap ring;

[0032] 5. Guide component; 51. Guide sleeve; 52. First guide ring; 53. Second guide ring; 54. Spiral groove; 55. Third guide ring. Specific embodiments

[0033] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present utility model in a schematic way, so they only show the components related to the present utility model. In the description of the present utility model, it should be understood that unless otherwise specified, the meaning of "a plurality of" is two or more.

[0034] See Figure 1 , a suspension oil cylinder in a specific embodiment of the present utility model includes a cylinder block 1, a piston rod 2, a piston 22, a limit component 3 and a sealing component 4. Among them, the limit component 3 includes an inner hole step structure 21 formed at the end of the piston rod 2 and extending towards the central axis direction of the piston rod 2. The piston 22 is sleeved on the piston rod 2, and the piston 22 extends to the end of the piston rod 2 and partially overlaps with the inner hole step structure 21. The overlapping part of the two is penetrated by a fixing member to realize the fixed connection between the inner hole step structure 21, the piston 22 and the piston rod 2. After the three are connected, the inner hole step structure 21 is adapted to reciprocate with the piston rod 2 in the cylinder block 1. And a limit step 31 extends from the bottom of the cylinder block 1, and a baffle 32 is provided on the limit step 31. When the piston rod 2 reciprocates in the cylinder block 1, the baffle 32 provided on the limit step 31 is adapted to, after the piston rod 2 moves to a set position, only the inner hole step structure 21 abuts against the baffle 32 to form a limit, while the piston 22 does not contact the baffle 32. And by using the baffle 32 to limit the moving stroke of the piston rod 2, it can avoid the direct impact between the piston 22 and the guide component 5 provided on the piston rod 2, thereby causing deformation of the piston 22 and the guide component 5, and thus affecting the basic performance of the piston 22 and the guide component 5. In addition, due to the setting of the baffle 32 on the limit step 31, when the piston rod 2 moves in the cylinder block 1, the baffle 32 can effectively limit the movement of the piston rod 2 to prevent the piston rod 2 from being completely pulled out.

[0035] In addition, the way the piston rod 2 forms a limit in the inner cavity of the cylinder block 1 will not affect the sealing performance of the sealing assembly 4, and the positioning of the piston rod 2 and its performance in withstanding impacts are better. In order to ensure the stable movement of the piston rod 2 in the cylinder block 1, a guiding assembly 5 is further provided between the piston rod 2 and the cylinder block 1. The guiding assembly 5 is adapted to guide the piston rod 2 to move along a set direction, and the guiding assembly 5 is adapted to be filled with lubricating oil. The sealing assembly 4 can seal the lubricating oil filled into the guiding assembly 5 so that the lubricating oil can continuously lubricate the guiding assembly 5 and the piston rod 2.

[0036] Specifically, the limiting step 31 includes a first step section 311 and a second step section 312. The baffle 32 is arranged on the first step section 311 and is installed and fixed by a fixing nut 33. After the fixing is completed, the plate surface of the baffle 32 abuts against the end surface of the second step section 312. In addition, in order to facilitate the installation and fixing of the baffle 32 by the fixing nut 33, a threaded structure is provided at the end of the first step section 311. The fixing nut 33 is preliminarily fixed on the first step section 311 via the threaded structure, and pin holes 34 are also provided on the fixing nut 33 and the first step section 311. A cylindrical pin 35 is adapted to be embedded in the pin holes 34 so that the cylindrical pin 35 passes through the fixing nut 33 and the first step section 311 at the same time, thereby realizing the locking and fixing of the fixing nut 33 and the first step section 311 by the cylindrical pin 35.

[0037] See Figure 2 or Figure 3 , the guiding assembly 5 includes a guide sleeve 51. The guide sleeve 51 is arranged at the open end of the cylinder block 1, and the sealing assembly 4 includes a dust cover 41 and a dust ring 42. The dust cover 41 is arranged at the open end of the cylinder block 1, and the dust ring 42 is arranged between the guide sleeve 51 and the piston rod 2 and is arranged close to the open end of the cylinder block 1. A first guide ring 52 and a second guide ring 53 are provided between the guide sleeve 51 and the piston rod 2. Among them, both the first guide ring 52 and the second guide ring 53 are arranged along the axial direction of the piston rod 2.

[0038] See Figures 2 to 4 , the first guide ring 52 is arranged close to the open end of the cylinder block 1, the second guide ring 53 is arranged away from the open end of the cylinder block 1, and spiral grooves 54 are provided on the inner circles (i.e., the sides close to the piston rod 2) of both the first guide ring 52 and the second guide ring 53. The lubricating oil filled into the guiding assembly 5 is adapted to flow into the spiral grooves 54 so that when the piston rod 2 reciprocates, the lubricating oil in the spiral grooves 54 can continuously lubricate the piston rod 2.

[0039] Specifically, an oil inlet 11 is provided on the cylinder block 1, and an oil filling cup 12 is provided at the oil inlet 11. An oil inlet cavity 15 is formed between the guide sleeve 51 and the inside of the cylinder block 1. The oil inlet cavity 15 is communicated with the oil inlet 11, so that oil can be poured into the oil inlet cavity 15 through the oil inlet 11. A lubrication cavity 16 is also provided between the guide sleeve 51 and the cylinder block 1. The oil inlet cavity 15 is adapted to communicate with the lubrication cavity 16 to be able to transport oil from the oil inlet cavity 15 into the lubrication cavity 16. In addition, the first guide ring 52 is arranged in the lubrication cavity 16. Therefore, the lubricating oil poured into the lubrication cavity 16 can flow into one end port of the spiral groove 54 formed in the inner ring of the first guide ring 52 and flow out through the other end. And the lubricating oil in the spiral groove 54 of the first guide ring 52 is filled separately, that is, the lubricating oil flowing into the lubrication cavity 16 through the oil filling cup 12 is filled separately into the spiral groove 54 formed in the inner ring of the first guide ring 52, so as to ensure sufficient lubrication between the first guide ring 52 and the piston rod 2 during the reciprocating movement of the piston rod 2.

[0040] See Figure 3 , an oil outlet 13 is also provided on the cylinder block 1. In addition, an oil discharging cup 14 is provided at the oil outlet 13. An oil outlet cavity 17 is formed between the guide sleeve 51 and the cylinder block 1. The oil outlet cavity 17 can also communicate with the lubrication cavity 16. When the pressure in the lubrication cavity 16 is too high, the oil discharging cup 14 can be opened to enable the lubricating oil in the lubrication cavity 16 to flow through the oil outlet cavity 17 and finally flow out from the oil discharging cup 14. And through the settings of the oil filling cup 12 and the oil discharging cup 14, it is possible to quantitatively inject or discharge the lubricating oil in the lubrication cavity 16, so as to ensure that the pressure in the lubrication cavity 16 is in a relatively stable state.

[0041] See Figure 2 or Figure 3 , the sealing assembly 4 further includes first sealing rings 43 respectively arranged at both ends of the first guide ring 52. The first sealing rings 43 are used to seal both ends of the lubrication cavity 16, so that the lubricating oil injected into the lubrication cavity 16 will not flow axially along the gap between the piston rod 2 and the guide sleeve 51, thereby ensuring the sealing performance of the lubrication cavity 16.

[0042] Specifically, a second sealing ring 44, a rod sealing ring 45 and a snap ring 46 are sequentially arranged between the first guide ring 52 and the second guide ring 53. Among them, the second sealing ring 44 is arranged close to the second guide ring 53, the snap ring 46 is arranged close to the first guide ring 52, and the rod sealing ring 45 is arranged between the second sealing ring 44 and the snap ring 46. This combination form can withstand greater impact pressure and ensure the performance of the guide assembly 5.

[0043] More specifically, see Figure 1, the guiding assembly 5 further includes a third guiding ring 55 which is arranged between the piston 22 arranged on the piston rod 2 and the cylinder block 1. Therefore, the movement of the rod end of the piston rod 2 can be guided by the third guiding ring 55, and the movement of the rod body of the piston rod 2 can be guided by the mutual cooperation between the first guiding ring 52 and the second guiding ring 53, so as to ensure the stability of the movement of the piston rod 2 in the cylinder block 1. In addition, the first guiding ring 52, the second guiding ring 53 and the third guiding ring 55 are all integral guiding rings, and the first guiding ring 52, the second guiding ring 53 and the third guiding ring 55 can be set to be of equal length or unequal length. Of course, a spiral groove 54 can also be opened in the inner hole of the third guiding ring 55 and lubricating oil can be filled therein to ensure the lubrication effect between the piston 22 of the piston rod 2 and the cylinder block 1. And in order to ensure that the first guiding ring 52, the second guiding ring 53 and the third guiding ring 55 can withstand greater lateral force, therefore, the widths of the first guiding ring 52, the second guiding ring 53 and the third guiding ring 55 are set wider than the guiding rings used on the traditional guiding sleeve 51. In this embodiment, the widths of the first guiding ring 52, the second guiding ring 53 and the third guiding ring 55 can be set to be greater than or equal to 40 mm. Of course, on the premise that the internal structure of the cylinder block and the production and manufacturing capacity of the guiding ring permit, the wider the widths of the first guiding ring 52, the second guiding ring 53 and the third guiding ring 55 are, the better.

[0044] A vehicle according to a specific embodiment of the present invention adopts the suspension oil cylinder described in any one of the above embodiments, and thus also has the above advantages.

[0045] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The above is based on the enlightenment of the ideal embodiment of the present invention. Through the above description, relevant workers can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined by the scope of the claims.

Claims

1. A suspension cylinder, characterized in that: It comprises a cylinder body (1), a piston rod (2), a piston (22), a limit assembly (3) and a sealing assembly (4), wherein: The limiting assembly (3) comprises an inner hole step structure (21) opened at the end of the piston rod (2), and a limiting step (31) extending from the cylinder bottom of the cylinder body (1), and a baffle (32) is provided on the limiting step (31), and the baffle (32) is suitable for abutting against the inner hole step structure (21) to form a limit. The piston (22) is arranged on the piston rod (2), and the piston rod (2) is also provided with a guide assembly (5), and the guide assembly (5) is suitable for sealing the lubricating oil injected therein through the sealing assembly (4) to continuously lubricate the guide assembly (5) and the piston rod (2).

2. The suspension cylinder according to claim 1, characterized in that: The limiting step (31) comprises a first step section (311) and a second step section (312); the baffle (32) is arranged on the first step section (311) via a fixing nut (33) and abuts against the second step section (312).

3. The suspension cylinder according to claim 2, characterized in that: A threaded structure is provided at the end of the first step (311), and the fixing nut (33) is preliminarily fixed to the first step (311) via the threaded structure. A pin hole (34) is provided on both the fixing nut (33) and the first step (311), and a cylindrical pin (35) is embedded in the pin hole (34) so ​​that the fixing nut (33) can be locked to the first step (311) via the cylindrical pin (35).

4. The suspension cylinder according to claim 1, characterized in that: The guide assembly (5) comprises a guide sleeve (51), wherein the guide sleeve (51) is arranged at the open end of the cylinder body (1); the sealing assembly (4) comprises a dust cover (41) and a dust ring (42), wherein the dust cover (41) is arranged at the open end of the cylinder body (1); and the dust ring (42) is arranged between the guide sleeve (51) and the piston rod (2) and close to the open end of the cylinder body (1).

5. The suspension cylinder according to claim 4, characterized in that: The guide assembly (5) comprises a first guide ring (52) and a second guide ring (53) arranged between the guide sleeve (51) and the piston rod (2), and a third guide ring (55) arranged between the piston (22) and the cylinder body (1); the first guide ring (52), the second guide ring (53) and the third guide ring (55) are all arranged along the axial direction of the piston rod (2); and the inner rings of the first guide ring (52) and the second guide ring (53) are both provided with spiral grooves (54); and the spiral grooves (54) are suitable for the circulation of lubricating oil.

6. The suspension cylinder according to claim 5, characterized in that: The cylinder body (1) is provided with an oil inlet (11), and an oil filling cup (12) is provided at the oil inlet (11). An oil inlet chamber (15) is provided between the guide sleeve (51) and the cylinder body (1), and the oil inlet (11) is suitable for being connected to the oil inlet chamber (15). A lubrication chamber (16) is provided between the guide sleeve (51) and the piston rod (2), and the oil inlet chamber (15) is suitable for being connected to the lubrication chamber (16). The first guide ring (52) is arranged in the lubrication chamber (16) so that lubrication oil can be separately poured into the spiral groove (54) of the first guide ring (52) via the oil filling cup (12).

7. The suspension cylinder according to claim 6, characterized in that: The cylinder body (1) is provided with an oil outlet (13), an oil discharge cup (14) is provided at the oil outlet (13), an oil outlet cavity (17) is also provided between the guide sleeve (51) and the cylinder body (1), and the oil outlet cavity (17) is suitable for communicating with the lubricating cavity (16) so as to guide the lubricating oil in the lubricating cavity (16) to flow out through the oil discharge cup (14).

8. The suspension cylinder according to claim 6, characterized in that: The sealing assembly (4) further comprises a first sealing ring (43) respectively arranged at both ends of the first guide ring (52), wherein the first sealing ring (43) is suitable for sealing the lubrication cavity (16) to limit the axial flow of the lubrication oil injected into the lubrication cavity (16) along the piston rod (2).

9. The suspension cylinder according to claim 5, characterized in that: The sealing assembly (4) further comprises a second sealing ring (44) arranged between the first guide ring (52) and the second guide ring (53), a rod sealing ring (45) and an open retaining ring (46), wherein the second sealing ring (44) is arranged close to the second guide ring (53), the open retaining ring (46) is arranged close to the first guide ring (52), and the rod sealing ring (45) is arranged between the second sealing ring (44) and the open retaining ring (46).

10. A vehicle, characterized in that: It comprises the suspension cylinder as claimed in any one of claims 1 to 9.

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