Inner curve motor plunger assembly

Abstract

The utility model relates to an inner curve motor plunger assembly which comprises a plunger body, a bearing bush and a roller, a plurality of piston ring grooves are formed in the outer wall of the end, close to a cylinder body, of the plunger body, piston rings are arranged in the piston ring grooves, and an arc-shaped groove is formed in the other end of the plunger body. A first oil guide hole, a damping hole and a second oil guide hole are sequentially formed in the middle area of the plunger body in the axial direction of the plunger body. A third oil guide hole is formed in the bearing bush, and the first oil guide hole, the damping hole, the second oil guide hole and the third oil guide hole are sequentially communicated to form a continuous and sealed oil guide channel; the outer diameter of the bearing bush is matched with the arc-shaped groove of the plunger main body, so that the bearing bush can be stably fixed in the arc-shaped groove of the plunger main body; the roller is in rolling contact with the bearing bush, an annular groove is formed in the outer surface of the roller, and the third oil guide hole corresponds to the annular groove in position. The motor plunger assembly can solve the problem that an inner curve motor plunger assembly is prone to being abraded and damaged due to the fact that the motor plunger assembly is poor in abrasion resistance.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic machinery, in particular to an inner curve motor plunger component. Background Art

[0002] In the current field of hydraulic technology, the working efficiency and stability of hydraulic components are increasingly valued. As a key actuator in the hydraulic system, the inner curve hydraulic motor has excellent performance in providing superior low-speed performance, achieving high-efficiency conversion, compact dimensions and high torque output due to its unique design characteristics. It is widely used in engineering machinery, ship propulsion, mining machinery and other fields. In the inner curve hydraulic motor, the plunger assembly, as the most important component, has an important impact on the life of the inner curve hydraulic motor. Its working principle is that the working medium (hydraulic oil, etc.) acts on the end face of the plunger, causing the plunger to make linear reciprocating motion, and then through the motion conversion mechanism (swash plate, cam and crank, etc.), the reciprocating motion of the plunger is converted into the circular motion of the output shaft. It can be seen that the motor plunger assembly is the core component of the plunger motor and directly affects the performance of the plunger motor. However, just as any product has its two sides, the existing motor plunger assembly also faces some challenges. Faced with the long-term operation challenges under harsh working conditions, the problems of the inner curve motor plunger assembly are becoming increasingly prominent. In particular, problems such as relatively short service life and poor wear resistance not only affect the overall operating efficiency of the equipment, but also increase maintenance costs and replacement frequency to a certain extent.

[0003] Based on the above background, it is particularly necessary and urgent to develop a wear-resistant inner curve motor plunger assembly. Utility Model Content

[0004] The utility model aims to provide an inner-curve motor plunger assembly to solve the problem that the motor plunger assembly proposed in the background art has poor wear resistance, resulting in the inner-curve motor plunger assembly being easily damaged by wear.

[0005] The utility model aims to provide an inner curve motor plunger assembly, comprising a plunger body, a bearing bush and a roller, wherein a plurality of piston ring grooves are provided at an outer wall of one end of the plunger body close to the cylinder body, the plurality of piston ring grooves are sequentially arranged and distributed along the axial direction of the plunger body, a piston ring is arranged in each of the plurality of piston ring grooves, an arc-shaped groove is provided at the other end of the plunger body, and a first oil guide hole, a damping hole and a second oil guide hole are sequentially provided in the middle area of ​​the plunger body along the axial direction thereof;

[0006] The bearing bush is provided with a third oil guide hole corresponding to the position of the second oil guide hole, and the first oil guide hole, the damping hole, the second oil guide hole and the third oil guide hole are sequentially connected to form a continuous and sealed oil guide channel; the outer diameter of the bearing bush matches the arc-shaped groove of the plunger body, so that the bearing bush can be firmly fixed in the arc-shaped groove of the plunger body;

[0007] The roller is in rolling contact with the bearing bush, an annular groove is provided on the outer surface of the roller, and the position of the third oil guide hole corresponds to the position of the annular groove.

[0008] Furthermore, the outer surface of the plunger body adopts a conical design, and the plunger body gradually shrinks along the axial direction from one end close to the cylinder body to the other end far away from the cylinder body, forming a continuous taper.

[0009] Furthermore, two baffles are also included, which are respectively installed on the outside of the plunger body and located on both sides of the roller, and are used to locate the axial position of the roller.

[0010] Furthermore, there are two piston ring grooves.

[0011] Furthermore, micro texture is arranged in the annular groove.

[0012] Furthermore, the bearing bush is made of copper material.

[0013] Furthermore, the outer surface of the bearing is coated with a diamond-like coating.

[0014] Furthermore, a wear-resistant coating is coated on the surface of the baffle.

[0015] Beneficial effects of the utility model:

[0016] The inner curve motor plunger assembly of the utility model,

[0017] 1. Since the third oil guide hole matching the second oil guide hole on the plunger body is provided on the bearing bush, a continuous and sealed oil guide channel can be formed. Therefore, the hydraulic oil can flow from the bearing bush into the roller to form lubrication to reduce the wear of the motor plunger assembly.

[0018] 2. Since annular grooves are provided on the rollers, more lubricants can be stored, which is conducive to forming a stable hydraulic oil film; in addition, the annular grooves can reduce the friction and heat between the rollers and adjacent components, that is, reduce the possibility of thermal deformation and wear.

[0019] 3. Since multiple piston ring grooves and piston rings that match the ring grooves are opened on the outer wall of the plunger body close to the cylinder body, an additional sealing barrier can be formed. Because the piston ring can fit tightly on the inner wall of the cylinder body, it effectively prevents the hydraulic oil from leaking from the gap. At the same time, the design of the piston ring also has a certain degree of elasticity, which can adapt to the gap changes caused by pressure changes or wear, thereby maintaining long-term sealing performance. Ensure that the system can operate stably and efficiently. In addition, the 360-degree contact design of the piston ring ensures a uniform and close fit with the plunger hole, avoiding the problem of local wear or stress concentration. This uniform wear helps to extend the service life of the plunger assembly and reduce performance degradation caused by wear.

[0020] 4. As the outer surface of the plunger body adopts a conical design, the plunger body gradually shrinks along the axial direction from one end close to the cylinder body to the other end away from the cylinder body, forming a continuous taper. This conical design allows the plunger body to automatically adjust and maintain the best contact with the cylinder body through the cooperation of the conical design and the piston ring when the plunger body moves in the cylinder body, even if the plunger body tilts due to unbalanced force, thereby effectively reducing scratches on the plunger hole and improving the wear resistance and service life of the plunger assembly.

[0021] Therefore, the utility model can improve the wear resistance and service life of the motor plunger assembly, and reduce the maintenance cost and replacement frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of this embodiment;

[0023] Figure 2 2 is a cross-sectional view of the plunger body in this embodiment.

[0024] Description of reference numerals:

[0025] 1- plunger body, 11- piston ring groove, 12- piston ring, 13- oil guide hole, 14- damping hole, 15- second oil guide hole;

[0026] 2-bearing shell, 21-third oil guide hole;

[0027] 3-roller, 31-ring groove;

[0028] 4- Baffle. DETAILED DESCRIPTION

[0029] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0031] like Figure 1 to Figure 2 As shown, in this embodiment, an inner curve motor plunger assembly includes a plunger body 1, a bearing 2 and a roller 3. The outer wall of the plunger body 1 close to one end of the cylinder body is provided with a plurality of piston ring grooves 11, and the plurality of piston ring grooves 11 are arranged in sequence along the axial direction of the plunger body 1, and a piston ring 12 is arranged in each of the plurality of piston ring grooves 11. The other end of the plunger body 1 is provided with an arc-shaped groove, and the middle area of ​​the plunger body 1 is provided with a first oil guide hole 13, a damping hole 14 and a second oil guide hole 15 in sequence along the axial direction from the right side to the left side, and the three channels are connected to each other in a straight line to form a complete hydraulic oil flow path. The bearing 2 is provided with a third oil guide hole 21 corresponding to the position of the second oil guide hole 15, so that the first oil guide hole 13, the damping hole 14, the second oil guide hole 15 and the third oil guide hole 21 are connected in sequence to form a continuous and sealed oil guide channel. The outer diameter of the bearing bush 2 matches the arc-shaped groove of the plunger body 1, so that the bearing bush 2 can be firmly fixed in the arc-shaped groove of the plunger body 1. The roller 3 is in rolling contact with the bearing bush 2, and an annular groove 31 is formed on the outer surface of the roller 3. The position of the third oil guide hole 21 corresponds to the position of the annular groove 31.

[0032] Among them, the first oil guide hole 13 is used to introduce hydraulic oil, and the damping hole 14 is used to adjust the flow speed and flow pulsation of the hydraulic oil, so that the oil can slowly and fully flow to the roller 3 to form oil film lubrication. If the damping hole 14 is not added, when the oil pressure is high, the oil will be quickly sprayed to the roller 3 during the extension and retraction process of the plunger body 1, and the purpose of full and uniform contact cannot be achieved. Therefore, the main function of the damping hole 14 is to reduce the flow pulsation and make the oil flow stable and continuous. The second oil guide hole 15 cooperates with the third oil guide hole 21 on the bearing shell 2 to form a complete oil guide channel to realize the circulation of hydraulic oil. That is, the third oil guide hole 21 can play a role in drainage on the one hand, and determine the position of the bearing shell 2 on the other hand. During installation, the third oil guide hole 21 is aligned with the second oil guide hole 15 to achieve accurate positioning of the bearing shell 2.

[0033] In summary, the working principle of this embodiment is that the hydraulic oil flows in through the first oil guide hole 13 of the plunger body 1, and flows slowly and evenly into the second oil guide hole 15 through the damping hole 14. Then it flows to the third oil guide hole 21 on the bearing bush 2 through the second oil guide hole 15. Since the roller 3 and the bearing bush 2 are in rolling contact, the hydraulic oil can flow from the bearing bush 2 into the annular groove 31 of the roller 3, forming lubrication and reducing the wear of the inner curve motor plunger assembly.

[0034] Secondly, when the roller 3 is provided with an annular groove 31, the annular groove 31 can accommodate a certain amount of hydraulic oil, forming an oil film between the roller 3 and the bearing 2. This oil film acts as a lubricant, significantly reducing the direct friction between the roller 3 and the bearing 2, thereby reducing the friction. In contrast, a roller without an annular groove cannot effectively maintain this oil film, which may cause more direct contact and friction. In addition, when the roller 3 is provided with an annular groove 31, the friction is reduced, and the heat generation is also reduced. This helps to reduce the temperature of the roller 3 and related components (such as the bearing 2, etc.), and reduce the possibility of thermal deformation and wear. Rollers without annular grooves may generate more heat due to higher friction, which accelerates wear.

[0035] In addition, when the motor is working, the roller 3 rolls on the bearing 2, thereby driving the movement of the bearing 2 and the entire plunger assembly. This rolling contact reduces friction and wear, and improves the efficiency and life of the system. At the same time, as the plunger body 1 moves further, the hydraulic oil can be effectively recovered and reused in the entire motor system.

[0036] Finally, when the plunger body 1 reciprocates in the cylinder body, friction will be generated. After long-term operation, this friction will cause wear, so that the gap between the plunger body 1 and the cylinder body increases, thereby causing hydraulic oil leakage. During the operation of the motor, hydraulic oil leakage will not only lead to a decrease in the efficiency of the entire system, but may also cause other faults. Therefore, in this embodiment, a piston ring groove 11 and a piston ring 12 corresponding to the piston ring groove 11 are provided on the outer surface of the plunger body 1, the purpose of which is to further enhance the sealing performance and reduce hydraulic oil leakage. Specifically, in this embodiment, a plurality of piston ring grooves 11 are provided on the outer wall of one end of the plunger body 1 close to the cylinder body, and the plurality of piston ring grooves 11 are arranged and distributed in sequence along the radial direction of the plunger body 1, and the inner walls of the plurality of piston ring grooves 11 are fixedly installed with piston rings 12. The addition of the piston ring 12 can form an additional sealing barrier. The piston ring 12 can fit tightly on the inner wall of the cylinder body, effectively preventing the hydraulic oil from leaking from the gap. At the same time, the design of the piston ring 12 also has a certain degree of elasticity, which can adapt to the gap changes caused by pressure changes or wear, thereby maintaining long-term sealing performance. Ensure that the system can operate stably and efficiently. The 360-degree contact design of the piston ring 12 ensures a uniform and tight fit with the plunger hole, avoiding problems with local wear or stress concentration. This uniform wear helps to extend the service life of the plunger assembly and reduce performance degradation due to wear. In this way, the workload and pressure borne by the plunger assembly and its related components (such as bearings 2, rollers 3, etc.) will be reduced, thereby reducing the risk of wear and damage. In this way, the problem that the motor plunger assembly has poor wear resistance, resulting in the inner curve motor plunger assembly being easily damaged by wear, can be solved. It is also possible to ensure the stable operation of the motor, reduce wear, extend its service life and reduce maintenance costs. Preferably, two groups of piston ring grooves 11 are provided.

[0037] As a specific implementation of this embodiment, the outer surface of the plunger body 1 adopts a conical design, and the plunger body 1 gradually shrinks axially from one end close to the cylinder body to the other end away from the cylinder body to form a continuous taper. This conical design allows the plunger body 1 to automatically adjust and maintain optimal contact with the cylinder body through the cooperation of the conical design and the piston ring 12 when the plunger body 1 moves in the cylinder body, even if it tilts due to unbalanced force, thereby effectively reducing scratches on the plunger hole and improving the wear resistance and service life of the plunger assembly. In addition, when the plunger body 1 is inserted into the plunger hole, it can gradually adapt to the shape of the plunger hole instead of simply directly impacting the hole wall. Thereby, wear caused by impact and friction can be reduced. This gradual adaptation process can disperse the contact pressure, reduce single-point or local high-pressure areas, and thus reduce the possibility of wear. Preferably, in order to further enhance the wear resistance and improve the service life of the motor wear-resistant plunger assembly, a material with high wear resistance and good lubrication properties can also be used to make the plunger body 1.

[0038] As a specific implementation of this embodiment, two baffles 4 are also included. They are respectively installed on the outside of the plunger body 1 and on both sides of the roller 3, and are used to locate the radial position of the roller 3 to prevent the roller 3 from falling off during operation. Of course, it can be known that the outside of the plunger body 1 is matched with the plunger hole. Taking the cost factor into consideration, during installation, the plunger body 1 is first installed into the plunger hole, and then the bearing 2 and the roller 3 are installed in sequence, and finally the two baffles 4 are installed in the plunger hole. To prevent the plunger body 1 from directly contacting and generating friction with the plunger hole, the baffle 4 is allowed to contact with the plunger hole. Once the baffle 4 shows signs of damage, the baffle can be directly replaced without replacing the plunger body 1.

[0039] As a specific implementation of this embodiment, micro texture is provided in the annular groove 31. The purpose is to enhance the adhesion and stability of the oil film.

[0040] As a specific implementation of this embodiment, the bearing bush 2 is made of copper material. As a flexible component, it can absorb and disperse the impact and vibration of the entire motor system during operation, thereby protecting other parts from damage.

[0041] As a specific implementation of this embodiment, the outer surface of the bearing bush 2 is coated with a diamond-like coating, in order to reduce friction loss under heavy load conditions.

[0042] As a specific implementation of this embodiment, a wear-resistant coating is coated on the surface of the baffle 4. The wear-resistant coating is a nano-composite coating, a ceramic coating or a DLC coating.

[0043] It should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various utility model aspects, in the above description of the exemplary embodiments of the utility model, the various features of the utility model are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the following intention: the claimed utility model requires more features than the features explicitly recited in each claim. More specifically, as reflected in the above claims, the utility model aspects are less than all the features of the single embodiment disclosed above. Therefore, the claims following the specific embodiment are hereby expressly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the utility model.

[0044] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and to form different embodiments. It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. An inner curve motor plunger assembly, comprising a plunger body (1), a bearing bush (2) and a roller (3), characterized in that: A plurality of piston ring grooves (11) are provided on the outer wall of one end of the plunger body (1) close to the cylinder body. The plurality of piston ring grooves (11) are sequentially arranged and distributed along the axial direction of the plunger body (1). A piston ring (12) is arranged in each of the plurality of piston ring grooves (11). An arc-shaped groove is provided at the other end of the plunger body (1). A first oil guide hole (13), a damping hole (14) and a second oil guide hole (15) are sequentially arranged in the middle region of the plunger body (1) along the axial direction thereof. The bearing bush (2) is provided with a third oil guide hole (21) corresponding to the position of the second oil guide hole (15); the first oil guide hole (13), the damping hole (14), the second oil guide hole (15) and the third oil guide hole (21) are connected in sequence to form a continuous and sealed oil guide channel; the outer diameter of the bearing bush (2) matches the arc-shaped groove of the plunger body (1), so that the bearing bush (2) can be firmly fixed in the arc-shaped groove of the plunger body (1); The roller (3) is in rolling contact with the bearing bush (2); an annular groove (31) is provided on the outer surface of the roller (3); and the position of the third oil guide hole (21) corresponds to the position of the annular groove (31).

2. The inner curve motor plunger assembly according to claim 1, characterized in that: The outer surface of the plunger body (1) adopts a conical design, and the plunger body (1) gradually shrinks along the axial direction from one end close to the cylinder body to the other end away from the cylinder body, forming a continuous taper.

3. The inner curve motor plunger assembly according to claim 2, characterized in that: It also comprises two baffles (4), which are respectively mounted on the outside of the plunger body (1) and located on both sides of the roller (3) and are used to locate the axial position of the roller (3).

4. The inner curve motor plunger assembly according to claim 1, characterized in that: The piston ring grooves (11) are provided with two.

5. The inner curve motor plunger assembly according to claim 1, characterized in that: Micro textures are arranged in the annular groove (31).

6. The inner curve motor plunger assembly according to claim 1, characterized in that: The bearing bush (2) is made of copper material.

7. The inner curve motor plunger assembly according to claim 6, characterized in that: The outer surface of the bearing bush (2) is coated with a diamond-like coating.

8. The inner curve motor plunger assembly according to claim 3, characterized in that: The surface of the baffle (4) is coated with a wear-resistant coating.

Images