Inner curve motor plunger anti-rotation fixing structure

Abstract

The utility model relates to an anti-rotation fixing structure for an inner curve motor plunger, which belongs to the technical field of inner curve radial plunger motors and comprises a front shell, a stator is fixedly mounted on the rear portion of the front shell, a rear shell is fixedly mounted on the rear portion of the stator, an output shaft is rotatably mounted in the front shell, and the output shaft is rotatably mounted in the rear shell. A rotor is rotationally installed in the stator, and the end, located in the front shell, of the output shaft is fixedly connected with the rotor. According to the inner curve motor plunger anti-rotation fixing structure, the metal pressing plates are installed on the two sides of the rotor through the installation screws, the non-metal baffle ring is installed between the two metal pressing plates, the non-metal baffle ring is fixed to the surface of the rotor and makes contact with the piston, friction loss is reduced, and the problem that the structural strength of a plastic check block and an elastic pin is insufficient is solved; and meanwhile, the problems that the metal baffle ring and the piston are easily abraded and damaged and the service life of the motor is seriously shortened because the snap ring and the piston are both made of metal materials and the friction force between the snap ring and the piston is large are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of inner-curve radial piston motors, in particular to an anti-rotation fixing structure for an inner-curve motor plunger. Background Art

[0002] A hydraulic motor is an actuator in a hydraulic system that converts the liquid pressure energy provided by a hydraulic pump into mechanical energy—speed and torque—of its output shaft. Hydraulic motors are used in engineering machinery, construction machinery, coal mining machinery, mining machinery, metallurgical machinery, petrochemical industry, injection molding machinery, ships, hoists, and other applications. The internal-curve radial piston hydraulic motor is one of the mainstream structural forms of hydraulic motors, characterized by low operating speed and high output torque. Its unique design achieves high-torque output through built-in multiple rows of pistons, while also featuring low torque pulsation, balanced radial force, and high starting torque. The rotor assembly is the most critical component of the motor, consisting primarily of cylindrical rollers, bearings, pistons, piston rings, rotors, and other parts.

[0003] A common motor structure uses a plastic block and elastic pin. However, the elastic pin in this structure is not strong enough to withstand the reaction force transmitted to the plastic block when the cylindrical roller deflects under harsh working conditions. This can instantly cause the elastic pin to break and the hydraulic motor to fail.

[0004] Therefore, Chinese patent CN217421409U discloses an inner-curve radial piston motor rotor assembly, which uses a snap ring and a circlip instead of the elastic pin and the plastic block, making the motor more adaptable to harsh working conditions.

[0005] However, the retaining ring and the piston are both made of metal, and the friction between them is large, which can easily cause wear and damage to the metal retaining ring and the piston, seriously reducing the life of the motor. In view of this, the present application proposes an anti-rotation fixing structure for the inner curve motor plunger. Utility Model Content

[0006] In response to the shortcomings of the existing technology, the utility model provides an anti-rotation fixing structure for the inner curve motor plunger, which has the advantages of being used in combination with a metal pressure plate and a non-metallic retaining ring. It solves the problems of insufficient strength of the plastic stopper plus elastic pin structure and easy breakage of the elastic pin. At the same time, it avoids the problem that the retaining ring and the piston are made of the same metal material, and the friction between the two is large, which can easily cause wear and damage to the metal retaining ring and the piston, seriously reducing the life of the motor.

[0007] To achieve the above objectives, the present invention provides the following technical solutions: an anti-rotation fixing structure for an inner-curve motor plunger, comprising a front housing, a stator fixedly mounted on the rear portion of the front housing, a rear housing fixedly mounted on the rear portion of the stator, an output shaft rotatably mounted inside the front housing, a rotor rotatably mounted inside the stator, one end of the output shaft located inside the front housing being fixedly connected to the rotor, mounting screw holes being provided on both sides of the rotor, metal pressure plates being mounted on both sides of the rotor via mounting screws, and a speed sensor fixedly mounted on the end surface of the rear housing;

[0008] The rotor is radially evenly distributed with piston holes, the pistons are slidably installed inside the piston holes, a non-metallic retaining ring is fixedly installed between the two metal pressure plates, the non-metallic retaining ring is located on the surface of the rotor, and the piston slides through the non-metallic retaining ring.

[0009] Furthermore, a speed measuring tooth is provided on the edge of the metal pressure plate, the speed sensor is aligned with the speed measuring tooth, a mounting through hole is provided on the top of the metal pressure plate, and the metal pressure plate is mounted on both side end faces of the rotor using mounting screws through the mounting through hole on the top.

[0010] Furthermore, an annular sealing groove is provided on the surface of the piston.

[0011] Furthermore, a sealing ring is installed at the position of the annular sealing groove, and the sealing ring is in contact with the inner wall of the piston hole.

[0012] Furthermore, a bearing bush is fixedly mounted on one side of the piston, a cylindrical roller is fixedly mounted on one side of the bearing bush, and the cylindrical roller contacts the inner side wall of the stator.

[0013] Furthermore, an oil channel is provided on the top of the rotor, the oil channel is communicated with the piston hole, and a hydraulic inlet and a hydraulic outlet are provided at the position of the rear housing.

[0014] Furthermore, the center of the rotor has a spline hole, which is adapted to the output shaft.

[0015] Compared with the prior art, the present invention provides an anti-rotation fixing structure for an inner-curve motor plunger, which has the following beneficial effects:

[0016] 1. The anti-rotation fixing structure of the inner curve motor plunger is characterized by installing metal pressure plates on both sides of the rotor by installing screws, and installing a non-metallic retaining ring between the two metal pressure plates, so that the non-metallic retaining ring is fixed on the surface of the rotor and contacts the piston to limit the deflection of the piston. The non-metallic retaining ring is made of non-metallic wear-resistant and low-friction material, which can effectively reduce the friction loss between the piston and the retaining ring, and improve the service life of the retaining ring, thereby improving the life of the motor. The metal pressure plate plays the role of fixing the retaining ring so that the retaining ring does not separate from the rotor, solving the problem of insufficient strength of the plastic stopper plus elastic pin structure, and at the same time avoiding the problem that the retaining ring and the piston are made of the same metal material, and the friction between the two is large, which can easily cause wear and damage of the metal retaining ring and the piston, seriously reducing the life of the motor.

[0017] 2. The anti-rotation fixing structure of the inner curve motor plunger is achieved by setting speed measuring teeth on the edge of the metal pressure plate and installing a speed sensor at the position of the front shell. The speed sensor detects the change of the speed measuring teeth to detect the speed of the motor. By installing screws to replace the metal pressure plate with speed measuring teeth of different specifications, it can adapt to different speed sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a side cross-sectional view of the stator and rotor structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the piston installation of the utility model;

[0021] Figure 4 It is a three-dimensional schematic diagram of the metal pressing plate of the utility model.

[0022] In the figure: 1. Front housing; 2. Rear housing; 21. Hydraulic inlet; 22. Hydraulic outlet; 3. Stator; 4. Rotor; 41. Mounting screw hole; 42. Piston hole; 43. Oil channel; 44. Spline hole; 5. Metal pressure plate; 51. Speed measuring tooth; 52. Mounting through hole; 6. Speed sensor; 7. Mounting screw; 8. Piston; 9. Annular sealing groove; 10. Sealing ring; 11. Bearing; 12. Cylindrical roller; 13. Non-metallic retaining ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1: Please refer to Figures 1 to 4 , an anti-rotation fixing structure for the inner curve motor plunger includes a front housing 1, a stator 3 is fixedly installed on the rear part of the front housing 1, a rear housing 2 is fixedly installed on the rear part of the stator 3, an output shaft is rotatably installed inside the front housing 1, a rotor 4 is rotatably installed inside the stator 3, one end of the output shaft located inside the front housing 1 is fixedly connected to the rotor 4, mounting screw holes 41 are opened on both sides of the rotor 4, and metal pressure plates 5 are installed on both sides of the rotor 4 through mounting screws 7.

[0025] The top of the metal pressing plate 5 is provided with a mounting through hole 52 , and the metal pressing plate 5 is mounted on both side end surfaces of the rotor using mounting screws 7 through the mounting through hole 52 on the top.

[0026] The rotor 4 is radially distributed with piston holes 42, within which pistons 8 are slidably mounted. A non-metallic retaining ring 13 is fixedly mounted between the two metal pressure plates 5. The non-metallic retaining ring 13 is located on the surface of the rotor 4, and the piston 8 slides through the non-metallic retaining ring 13. The contact between the non-metallic retaining ring 13 and the piston 8 restricts the movement of the piston 8, reduces wear on the piston 8, and increases the service life of the motor.

[0027] It should be noted that the non-metallic retaining ring 13 is made of non-metallic low-friction and wear-resistant materials including but not limited to nylon, polytetrafluoroethylene, polyetheretherketone, etc., which can effectively reduce the friction loss between the piston 2 and the retaining ring 6, thereby increasing the service life of the retaining ring 6 and thus increasing the life of the motor.

[0028] At the same time, an annular sealing groove 9 is provided on the surface of the piston 8 .

[0029] A sealing ring 10 is installed at the position of the annular sealing groove 9, and the sealing ring 10 contacts the inner wall of the piston hole 42. The sealing ring 10 seals the piston 8 to prevent oil leakage.

[0030] Secondly, a bearing bush 11 is fixedly mounted on one side of the piston 8 , and a cylindrical roller 12 is fixedly mounted on one side of the bearing bush 11 . The cylindrical roller 12 contacts the inner wall of the stator 3 .

[0031] At the same time, an oil channel 43 is opened on the top of the rotor 4 , and the oil channel 43 is communicated with the piston hole 42 . A hydraulic inlet 21 and a hydraulic outlet 22 are opened on the top of the rear housing 2 .

[0032] The rotor 4 has a spline hole 44 at its center, which is adapted to the output shaft. When the hydraulic motor is working, the piston 8 performs a planetary motion along the stator 3 while performing a reciprocating motion along its axial direction.

[0033] Example 2: Based on Example 1, a speed sensor 6 is fixedly installed on the end face of the rear shell 2, and a speed measuring tooth 51 is provided on the edge of the metal pressure plate 5. The speed sensor 6 is aligned with the speed measuring tooth 51. The rotor 4 rotates, driving the metal pressure plate 5 to rotate. The speed sensor 6 detects the surface of the speed measuring tooth 51, thereby detecting the rotational speed of the metal pressure plate 5 and obtaining the rotational speed of the rotor 4.

[0034] When this embodiment is in use, the piston 8 reciprocates in the piston hole 42 of the rotor 4, and the two sides of the piston 8 have relative motion with the non-metallic retaining ring 13. By adopting the non-metallic retaining ring 13, the friction loss between the piston 8 and the non-metallic retaining ring 13 is effectively reduced, and the service life of the piston 8 and the non-metallic retaining ring 13 is improved, thereby increasing the service life of the motor. The non-metallic retaining ring 13 is fixed by the metal pressure plate 5, so that the installation structure of the non-metallic retaining ring 13 is stable, so that the non-metallic retaining ring 13 does not separate from the rotor 4. At the same time, a speed measuring tooth 51 is provided on the edge of the metal pressure plate 5 to facilitate the detection of the motor speed. The split metal pressure plate 5 and the non-metallic retaining ring 13 have a simple structure and are easy to assemble.

[0035] The electrical components mentioned in this article are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device that controls a computer, etc., and the existing public power connection technology is not described in detail in this article.

[0036] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0037] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-rotation fixing structure for an inner-curve motor plunger, comprising a front housing (1), characterized in that: The stator (3) is fixedly mounted on the rear of the front housing (1), and the rear of the stator (3) is fixedly mounted on the rear of the rear housing (2). An output shaft is rotatably mounted inside the front housing (1), and a rotor (4) is rotatably mounted inside the stator (3). One end of the output shaft is located inside the front housing (1) and is fixedly connected to the rotor (4). Mounting screw holes (41) are provided on both sides of the rotor (4). Metal pressure plates (5) are mounted on both sides of the rotor (4) via mounting screws (7). A speed sensor (6) is fixedly mounted on the end surface of the rear housing (2); The rotor (4) is radially evenly distributed with piston holes (42), the piston (8) is slidably installed inside the piston hole (42), a non-metallic retaining ring (13) is fixedly installed between the two metal pressure plates (5), the non-metallic retaining ring (13) is located on the surface of the rotor (4), and the piston (8) slides through the non-metallic retaining ring (13).

2. The anti-rotation fixing structure for an inner-curve motor plunger according to claim 1, characterized in that: The edge of the metal pressure plate (5) is provided with a speed measuring tooth (51), the speed sensor (6) is aligned with the speed measuring tooth (51), the top of the metal pressure plate (5) is provided with a mounting through hole (52), and the metal pressure plate (5) is mounted on both side end faces of the rotor using mounting screws (7) through the mounting through hole (52) on the top.

3. The anti-rotation fixing structure for an inner-curve motor plunger according to claim 1, characterized in that: An annular sealing groove (9) is provided on the surface of the piston (8).

4. The anti-rotation fixing structure for an inner-curve motor plunger according to claim 3, characterized in that: A sealing ring (10) is installed at the position of the annular sealing groove (9), and the sealing ring (10) is in contact with the inner wall of the piston hole (42).

5. The anti-rotation fixing structure for an inner-curve motor plunger according to claim 4, characterized in that: A bearing bush (11) is fixedly mounted on one side of the piston (8), a cylindrical roller (12) is fixedly mounted on one side of the bearing bush (11), and the cylindrical roller (12) is in contact with the inner side wall of the stator (3).

6. The anti-rotation fixing structure for an inner-curve motor plunger according to claim 3, characterized in that: An oil channel (43) is provided on the top of the rotor (4), the oil channel (43) is connected to the piston hole (42), and a hydraulic inlet (21) and a hydraulic outlet (22) are provided at the position of the rear housing (2).

7. The anti-rotation fixing structure for an inner-curve motor plunger according to claim 1, characterized in that: The center of the rotor (4) is provided with a spline hole (44), and the spline hole (44) is adapted to the output shaft.

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