Lightweight plunger motor

Abstract

The utility model discloses a lightweight plunger motor. The problems that an existing product is difficult to assemble, and friction is large when a plunger moves are solved. The device comprises a shell, a rear cover and a main shaft assembly, the front cover is detachably connected with the shell; the plunger assembly comprises a cylinder body, the cylinder body is connected with the main shaft assembly and driven by the main shaft assembly to rotate, and a variable cavity is formed in the cylinder body; and the working plunger is conical, is arranged in the variable cavity and moves relative to the cylinder body. The utility model has the beneficial effects that the front cover is detachably connected with the shell, the main shaft assembly and the plunger assembly are convenient to assemble, the structure is simple, the assembly is convenient and reliable, the working plunger is conical, the relative friction force between the working plunger and the cylinder body is reduced, the energy consumption is reduced, the abrasion is reduced, and the running speed of the working plunger is increased; the performance of the motor main body is maintained or improved, and the service life of the product is long.

Description

Technical Field

[0001] The utility model relates to a plunger motor, in particular to a lightweight plunger motor. Background Art

[0002] The plunger motor is an important device in the hydraulic system. The plunger motor is generally divided into axial piston motor and radial piston motor. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil suction and oil pressure. Variable piston motors are widely used in high pressure, large flow and flow adjustment occasions, such as hydraulic presses, engineering machinery and ships.

[0003] With the social demand for energy conservation and emission reduction, the overall weight control of each host is becoming more and more stringent. As a component of the host, the plunger motor is also facing the requirement of reducing weight. The housing and components of the existing plunger motor are usually made of cast iron, which is heavy and has a complex structure. The spindle assembly is not convenient to install. The spindle assembly is usually installed from the back cover, which is difficult to assemble. In addition, the existing plunger is usually a straight column type, and the contact area between the plunger and the inner wall of the cylinder body is large when inserted into the cylinder body, which causes large friction between the cylinder body and the plunger, and a short service life of the components. Utility Model Content

[0004] In order to solve the problems of difficult assembly of existing products in the background technology and large friction when the plunger moves, the utility model provides a lightweight plunger motor.

[0005] The technical solution of the utility model is: a lightweight plunger motor, comprising a housing, a rear cover and a spindle assembly, wherein the rear cover is provided with a first oil port and a second oil port, and further comprising:

[0006] A front cover is provided on the other end of the shell body opposite to the rear cover; the front cover is detachably connected to the shell body; the front cover, the shell body and the rear cover cooperate with each other to form a receiving cavity;

[0007] The plunger assembly is arranged in the accommodating cavity; the plunger assembly comprises:

[0008] The cylinder body is connected to the main shaft assembly and driven to rotate by the main shaft assembly. The first oil port and the second oil port are used to fill or discharge oil during the rotation of the cylinder body. The cylinder body is provided with a variable chamber.

[0009] The working plunger is conically arranged, disposed in the variable cavity and moves relative to the cylinder body.

[0010] As a further improvement of the utility model, the working plunger includes a spherical part and a piston part, the spherical part is arranged on the main shaft assembly, the piston part is inserted into the variable cavity, the piston part is arranged in a conical shape and the diameter of one end away from the spherical part is larger than the diameter of one end of the spherical part.

[0011] As a further improvement of the utility model, a limiting ring is provided on the piston portion, and the limiting ring fits with the inner wall of the variable cavity when the cylinder body rotates.

[0012] As a further improvement of the utility model, a groove is provided on the piston part, the limit ring is arranged in the groove, the groove is connected with the variable chamber, and the pressure oil enters the groove when the cylinder body rotates so that the limit ring fits against the inner wall of the variable chamber.

[0013] As a further improvement of the utility model, there are multiple working plungers, each of which is provided with multiple limiting rings, and the cylinder body is provided with a central plunger, and different working plungers are arranged around the central plunger.

[0014] As a further improvement of the present invention, the cylinder body is integrally formed of steel.

[0015] As a further improvement of the present invention, the front cover is integrally formed of cast aluminum.

[0016] As a further improvement of the utility model, the utility model also includes:

[0017] The bearing is sleeved outside the main shaft assembly and fits with the inner wall of the housing;

[0018] A first limiting member, which abuts against the bearing and is inserted into the inner wall of the housing to limit the axial position of the bearing;

[0019] A spacer block abuts against the spindle assembly;

[0020] The elastic washer is arranged between the cushion block and the bearing and provides elastic force.

[0021] As a further improvement of the utility model, the utility model also includes:

[0022] A second limiting member is inserted into the inner wall of the shell and abuts against the front cover to limit the axial position of the front cover;

[0023] A first sealing member is arranged on the inner side of the front cover and is in contact with the main shaft assembly for sealing the main shaft assembly;

[0024] The second sealing member is arranged on the outer wall of the front cover and cooperates with the shell to achieve sealing.

[0025] As a further improvement of the utility model, the first sealing member is provided with two clamping feet, both of which are in contact with the outer surface of the main shaft assembly, and the first sealing member is provided with a metal support, which is arranged in a "C" shape.

[0026] The beneficial effects of the utility model are that the front cover is detachably connected to the shell, which is convenient for the assembly of the spindle assembly and the plunger assembly; the structure is simple and the assembly is convenient and reliable; the working plunger is arranged in a conical shape, which reduces the relative friction between the cylinder body, reduces energy consumption, reduces wear, increases the speed of the working plunger during operation, maintains or improves the performance of the motor body, and at the same time prolongs the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Attached Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0028] Attached Figure 2 For attachment Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0029] Attached Figure 3 For attachment Figure 1 Schematic diagram of the enlarged structure at point B in the middle.

[0030] In the figure, 1, shell; 11, accommodating chamber; 2, rear cover; 3, spindle assembly; 4, front cover; 5, plunger assembly; 51, cylinder body; 511, variable chamber; 52, working plunger; 521, spherical part; 522, piston part; 523, limiting ring; 524, groove; 53, center plunger; 61, bearing; 62, first limiting member; 63, spacer block; 64, elastic gasket; 71, second limiting member; 72, first sealing member; 721, clamping foot; 722, metal support; 73, second sealing member. DETAILED DESCRIPTION

[0031] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0032] Depend on Figure 1 Figure 2-3 As shown, a lightweight plunger motor includes a housing 1, a rear cover 2 and a spindle assembly 3, wherein the rear cover 2 is provided with a first oil port and a second oil port, and further includes:

[0033] The front cover 4 is arranged on the other end of the housing 1 opposite to the rear cover 2; the front cover 4 is detachably connected to the housing 1; the front cover 4, the housing 1 and the rear cover 2 cooperate with each other to form a receiving cavity 11;

[0034] The plunger assembly 5 is disposed in the accommodating cavity 11; the plunger assembly 5 comprises:

[0035] The cylinder body 51 is connected to the main shaft assembly 3 and driven to rotate by the main shaft assembly 3. The first oil port and the second oil port are used to fill or discharge oil during the rotation of the cylinder body 51. The cylinder body 51 is provided with a variable chamber 511.

[0036] The working plunger 52 is set in a conical shape, is arranged in the variable cavity 511 and moves relative to the cylinder body 51. The beneficial effects of the utility model are that the front cover is detachably connected to the housing, which is convenient for the assembly of the spindle assembly and the plunger assembly, the structure is simple, and the assembly is convenient and reliable. The working plunger is set in a conical shape, which reduces the relative friction between the working plunger and the cylinder body, reduces energy consumption, reduces wear, increases the speed of the working plunger during operation, maintains or improves the performance of the motor body, and prolongs the service life of the product.

[0037] The working plunger 52 includes a spherical portion 521 and a piston portion 522. The spherical portion 521 is arranged on the spindle assembly 3, and the piston portion 522 is inserted into the variable cavity 511. The piston portion 522 is arranged in a conical shape, and the diameter of the end away from the spherical portion 521 is larger than the diameter of the end of the spherical portion 521. The conical piston portion facilitates the movement of the working plunger, reduces friction and wear, and at the same time, through the setting of the limit ring, the working plunger moves smoothly and reliably to achieve oil suction and discharge.

[0038] The piston part 522 is provided with a stop ring 523, and the stop ring 523 fits with the inner wall of the variable cavity 511 when the cylinder body 51 rotates. Specifically, the piston part 522 is provided with a groove 524, and the stop ring 523 is arranged in the groove 524, and the groove 524 is connected with the variable cavity 511. When the cylinder body 51 rotates, the pressure oil enters the groove 524 so that the stop ring 523 fits with the inner wall of the variable cavity 511. In this way, the oil pressure enters the groove so that the stop ring can reliably abut against the inner wall of the cylinder body, which is convenient for the working plunger to drive the oil in the variable cavity to move, and realize oil inlet and oil discharge.

[0039] There are multiple working plungers 52, each of which is provided with multiple limiting rings 523. The cylinder body 51 is provided with a central plunger 53, and different working plungers 52 are arranged around the central plunger 53. This makes the cylinder body move smoothly and reliably.

[0040] The cylinder body 51 is made of steel and is integrally formed. Specifically, the front cover 4 is made of cast aluminum and is integrally formed. By changing the material of the front cover and the cylinder body, and the structure of the housing and the plunger, the weight of the plunger motor is effectively reduced, and the performance of the motor body is maintained or improved.

[0041] The utility model also includes:

[0042] The bearing 61 is sleeved outside the main shaft assembly 3 and fits with the inner wall of the housing 1;

[0043] The first limiting member 62 abuts against the bearing 61 and is inserted into the inner wall of the housing 1 to limit the axial position of the bearing 61;

[0044] A spacer block 63 abuts against the spindle assembly 3;

[0045] The elastic washer 64 is arranged between the cushion block 63 and the bearing 61 and provides elastic force. Such a structure facilitates the installation of the bearing and the reliable rotation of the main shaft assembly. The elastic washer provides axial elastic force to facilitate the movement and positioning of the bearing.

[0046] The utility model also includes:

[0047] The second limiting member 71 is inserted into the inner wall of the housing 1 and abuts against the front cover 4 to limit the axial position of the front cover 4;

[0048] The first sealing member 72 is disposed inside the front cover 4 and is in contact with the spindle assembly 3 to seal the spindle assembly 3;

[0049] The second sealing member 73 is arranged on the outer wall of the front cover 4 and cooperates with the housing 1 to achieve sealing. Specifically, the first sealing member 72 is provided with two clamping feet 721, and the two clamping feet 721 are both in contact with the outer surface of the spindle assembly 3. The first sealing member 72 is provided with a metal support 722, and the metal support 722 is arranged in a "C" shape. Such a structure makes the front cover seal reliable, the structure is simple, the first sealing member has high strength, and the product has a long service life.

[0050] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0052] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of the utility model patent right.

Claims

1. A lightweight plunger motor, comprising a housing (1), a rear cover (2) and a spindle assembly (3), wherein the rear cover (2) is provided with a first oil port and a second oil port, characterized in that Also included: A front cover (4) is arranged on the other end of the shell (1) opposite to the rear cover (2); the front cover (4) is detachably connected to the shell (1); the front cover (4), the shell (1) and the rear cover (2) cooperate with each other to form a receiving cavity (11); The plunger assembly (5) is disposed in the accommodating cavity (11); the plunger assembly (5) comprises: The cylinder body (51) is connected to the main shaft assembly (3) and is driven to rotate by the main shaft assembly (3); the first oil port and the second oil port are used to fill or discharge oil during the rotation of the cylinder body (51); and a variable chamber (511) is provided on the cylinder body (51); The working plunger (52) is arranged in a conical shape, is disposed in the variable chamber (511), and moves relative to the cylinder body (51).

2. A lightweight plunger motor according to claim 1, characterized in that The working plunger (52) comprises a spherical portion (521) and a piston portion (522); the spherical portion (521) is arranged on the spindle assembly (3); the piston portion (522) is inserted into the variable cavity (511); the piston portion (522) is arranged in a conical shape and the diameter of one end away from the spherical portion (521) is larger than the diameter of one end of the spherical portion (521).

3. A lightweight plunger motor according to claim 2, characterized in that A limiting ring (523) is provided on the piston portion (522), and the limiting ring (523) fits against the inner wall of the variable chamber (511) when the cylinder body (51) rotates.

4. A lightweight plunger motor according to claim 3, characterized in that The piston portion (522) is provided with a groove (524), the limiting ring (523) is arranged in the groove (524), the groove (524) is connected to the variable chamber (511), and when the cylinder body (51) rotates, pressure oil enters the groove (524) so ​​that the limiting ring (523) fits the inner wall of the variable chamber (511).

5. A lightweight plunger motor according to claim 3, characterized in that There are a plurality of working plungers (52), each of which is provided with a plurality of limiting rings (523); a central plunger (53) is provided on the cylinder body (51), and the different working plungers (52) are arranged around the central plunger (53).

6. A lightweight plunger motor according to claim 1, characterized in that The cylinder body (51) is made of steel and is integrally formed.

7. A lightweight plunger motor according to claim 1, characterized in that The front cover (4) is integrally formed from cast aluminum.

8. A lightweight plunger motor according to claim 1, characterized in that Also includes: A bearing (61) is sleeved outside the main shaft assembly (3) and fits against the inner wall of the housing (1); A first limiting member (62) abuts against the bearing (61) and is inserted into the inner wall of the housing (1) to limit the axial position of the bearing (61); A spacer (63) abuts against the main shaft assembly (3); An elastic washer (64) is disposed between the cushion block (63) and the bearing (61) and provides elastic force.

9. A lightweight plunger motor according to claim 1, characterized in that Also includes: A second limiting member (71) is inserted into the inner wall of the housing (1) and abuts against the front cover (4) to limit the axial position of the front cover (4); A first sealing member (72) is disposed on the inner side of the front cover (4) and is in contact with the main shaft assembly (3) and is used for sealing the main shaft assembly (3); The second sealing member (73) is arranged on the outer wall of the front cover (4) and cooperates with the housing (1) to achieve sealing.

10. A lightweight plunger motor according to claim 9, characterized in that The first sealing member (72) is provided with two clamping feet (721), and the two clamping feet (721) are both in contact with the outer surface of the main shaft assembly (3). The first sealing member (72) is provided with a metal support (722), and the metal support (722) is arranged in a "C" shape.

Images