Grease pump

Abstract

The invention discloses a grease pump which comprises a power part, a plunger pump part and a shell, the power part and the plunger pump part are installed on the shell, the power part is connected with the plunger pump part, the power part comprises a motor and a planetary speed reducing mechanism, and a cam of the planetary speed reducing mechanism is connected with a plunger rod of the plunger pump part in an abutting mode. The transmission structure of the grease pump is optimized, and the transmission structure has the advantages of being stable in transmission, compact in structure and low in abrasion. Therefore, the reliability and the stability of the grease pump are greatly improved, the maintenance cost is reduced, and more efficient and economical use experience is brought to users.

Description

Technical Field

[0001] The present invention relates to an oil pump. Background Art

[0002] The oil pumps in the prior art adopt a combined structure of a motor and a crank - connecting rod mechanism to provide power for the reciprocating motion of an internal plunger pump. For example, the utility model patent with the invention name of semi - enclosed micro - electric oil pump and the publication number of CN203718352U, which was published on July 16, 2014, records that it includes a motor reducer, a crank - connecting rod mechanism, a plunger and a pump body. When powered on and started, the motor reducer drives the plunger, that is, the plunger rod, to reciprocate through the crank - connecting rod mechanism, completing the oil suction and oil discharge processes. Due to problems such as wear and looseness that easily occur in the crank - connecting rod mechanism during long - term operation, the movement process of the plunger rod becomes unstable, resulting in fluctuations in the oil output volume and being out of control, and it cannot meet the requirement of accurately outputting oil under various working conditions. In addition, the crank - connecting rod mechanism occupies a large space during operation, making the overall volume of the oil pump relatively large. Summary of the Invention

[0003] The technical problem to be solved by the present invention is how to improve the stability of the movement of the plunger rod, and thus obtain an oil pump with a stable oil output volume.

[0004] To solve the above - mentioned technical problem, the present invention adopts the following technical solution: The oil pump includes a power component, a plunger pump component, and a housing. The power component and the plunger pump component are installed on the housing. The power component is connected to the plunger pump component. The power component includes a motor and a planetary reduction mechanism. The motor and the planetary reduction mechanism are fixedly installed on the housing. The planetary reduction mechanism is located in the extending direction of the output shaft of the motor. The planetary reduction mechanism includes a mounting seat, a first - stage planetary gear assembly, and a second - stage planetary gear assembly. The first - stage planetary gear assembly and the second - stage planetary gear assembly are both movably installed inside the mounting seat. The output shaft of the motor is connected to the first - stage planetary gear assembly. The first - stage planetary gear assembly is connected to the second - stage planetary gear assembly. A cam is provided on the second - stage planetary gear assembly. The cam is located in the extending direction of the plunger rod of the plunger pump component. The center line of the output shaft of the motor is perpendicular to the center line of the plunger rod. The plunger pump component is provided with a return spring for pushing the plunger rod towards the position where the cam is located. The cam is connected to the plunger rod of the plunger pump component in a butt - joint manner.

[0005] The power for the reciprocating motion of the plunger rod comes from the cam and the return spring. The power for the rotation of the cam comes from the planetary reduction mechanism, and the return spring stores or releases potential energy through its own deformation. The grease pump uses a planetary reduction mechanism for transmission, which can extremely precisely adjust the gear speed and transmission ratio. With this characteristic, the movement speed of the plunger rod can be precisely controlled, and thus the accurate control of the grease output flow rate can be achieved, fully meeting the high-precision requirements for the amount of grease under various complex working conditions. This technical solution abandons the crank connecting rod mechanism, making the overall structure more compact and significantly reducing the occupied space. It is especially suitable for installation scenarios with limited space, greatly improving the installation convenience and applicability. Using the planetary reduction mechanism can effectively avoid structural designs that are prone to wear and looseness, and effectively reduce the fault points of wear and looseness. This not only greatly improves the reliability and stability of the grease pump, but also reduces the maintenance cost, bringing a more efficient and economical use experience to users.

[0006] Not all of the force exerted by the cam on the plunger rod is used to drive its movement. There is a part of power loss, mainly because the force contains a component force inclined to the extension direction of the plunger rod. The contact surface between the plunger rod and the external parts is extremely small. The external part is a cylinder structure wrapped around the plunger rod. This component force is different from the component force along the plunger rod. It will cause the plunger rod to squeeze the external parts, increasing the frictional force on the plunger rod. When the cam does work to overcome the large frictional force, the thrust required for the linear movement of the plunger rod decreases accordingly. To reduce the loss when the cam transmits power to the plunger rod, the plunger pump component is also provided with a transmission slider. The transmission slider is installed on the housing in a sliding manner. The sliding direction of the transmission slider is parallel to the center line of the plunger rod. The plunger rod is connected to the cam through the transmission slider. One end of the transmission slider is connected to the cam in a butting manner, and the other end of the transmission slider is fixedly connected to the plunger rod. One end of the return spring is connected to the transmission slider in a butting manner, and the return spring squeezes the transmission slider towards the position where the cam is located. The transmission slider is connected to the housing with a large contact surface. No matter how the force of the cam makes the transmission slider squeeze the housing, a sliding connection relationship with a low friction coefficient can be maintained between the two, weakening the situation where the cam does work to overcome the frictional force. Therefore, the transmission efficiency of the cam driving the transmission slider to the plunger rod is improved.

[0007] The present invention provides an optimized solution for a planetary reduction mechanism. An installation channel is provided on the mounting base, and straight teeth are provided on the mounting base. The straight teeth extend into the installation channel. The first-stage planetary gear assembly includes a sun gear I, planet gears I, and a gear seat I. The sun gear I is installed on the output shaft of the motor. Three planet gears I are installed on one side of the gear seat I. The sun gear I is located between the three planet gears I. The sun gear I meshes with the planet gears I, and the planet gears I mesh with the straight teeth of the mounting base. The second-stage planetary gear assembly includes a sun gear II, planet gears II, a gear seat II, and a rotating shaft. The sun gear II is located on the other side of the gear seat I and is integrated with the gear seat I. Three planet gears II are installed on one side of the gear seat II. The sun gear II is located between the three planet gears II. The sun gear II meshes with the planet gears II, and the planet gears II mesh with the straight teeth of the mounting base. The cam is located on the other side of the gear seat II and is integrated with the gear seat II. One end of the rotating shaft is fixedly connected to the sun gear I, and the other end of the rotating shaft is embedded in the housing and is slidably connected to the housing. The rotating shaft passes through the gear seat I, the gear seat II, and the cam. The gear seat I, the gear seat II, and the cam are all slidably connected to the rotating shaft. This planetary reduction mechanism has the advantages of a small size and a large design range of transmission ratios.

[0008] In order to improve the smoothness of the cam surface, a sliding sleeve is installed outside the cam. The sliding sleeve can reduce the friction force on the cam surface.

[0009] The present invention adopts the above technical solution: the transmission structure of the grease pump is optimized, and the transmission structure obtains the advantages of stable transmission, compact structure, and reduced wear. Thereby, the reliability and stability of the grease pump are greatly improved, and the maintenance cost is also reduced, bringing a more efficient and economical use experience to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be further specifically described below in conjunction with the drawings and specific embodiments.

[0011] Figure 1 Structural schematic of the combination of the power component and the plunger pump component of a grease pump according to the present invention Figure Ⅰ ;

[0012] Figure 2 Structural schematic of the combination of the power component and the plunger pump component of a grease pump according to the present invention Figure Ⅱ ;

[0013] Figure 3 Structural schematic of the combination of the power component and the plunger pump component of a grease pump according to the present invention Figure Ⅲ ;

[0014] Figure 4 Structural schematic diagram of the combination of the planetary reduction mechanism and the transmission slider member of a grease pump according to the present invention;

[0015] Figure 5 Structural schematic of the planetary reduction mechanism of an oil pump according to the present invention Figure Ⅰ ;

[0016] Figure 6 Structural schematic of the planetary reduction mechanism of an oil pump according to the present invention Figure Ⅱ ;

[0017] Figure 7 Structural schematic diagram of the first - stage planetary gear assembly of an oil pump according to the present invention;

[0018] Figure 8 Structural schematic diagram of the second - stage planetary gear assembly of an oil pump according to the present invention. Specific embodiments

[0019] As Figures 1 to 8 shown, the oil pump includes a power component, a plunger pump component, and a housing 18. The power component and the plunger pump component are installed on the housing 18, and the power component is connected to the plunger pump component.

[0020] The power component includes a motor 1 and a planetary reduction mechanism 2. The motor 1 and the planetary reduction mechanism 2 are fixedly installed on the housing 18. The planetary reduction mechanism 2 is located in the extending direction of the output shaft of the motor 1. The planetary reduction mechanism 2 includes a mounting seat 3, a first - stage planetary gear assembly 4, and a second - stage planetary gear assembly 5. The first - stage planetary gear assembly 4 and the second - stage planetary gear assembly 5 are both movably installed inside the mounting seat 3.

[0021] The mounting base 3 is fixed on the housing 18. An installation channel is provided inside the mounting base 3. Straight teeth are provided on the mounting base 3, and the straight teeth extend into the installation channel, forming a toothed ring at the installation channel. The first-stage planetary gear assembly 4 includes a sun gear I 6, a planetary gear I 7, and a gear seat I 8. The sun gear I 6 is fixedly installed on the output shaft of the motor 1, so that the output shaft of the motor 1 is connected to the first-stage planetary gear assembly 4. Three planetary gears I 7 are installed on one side of the gear seat I 8. The sun gear I 6 is located between the three planetary gears I 7, and the sun gear I 6 meshes with each planetary gear I 7. Each planetary gear I 7 also meshes with the straight teeth of the mounting base 3. The second-stage planetary gear assembly 5 includes a sun gear II 9, a planetary gear II 10, a gear seat II 11, a rotating shaft 13, a sliding sleeve 14, and a cam 12. The sun gear II 9 is located on the other side of the gear seat I 8 and is integrally connected with the gear seat I 8. When the gear seat I 8 rotates, the sun gear II 9 rotates synchronously. Three planetary gears II 10 are installed on one side of the gear seat II 11. The sun gear II 9 is located between the three planetary gears II 10, and the sun gear II 9 meshes with each planetary gear II 10. In this way, the first-stage planetary gear assembly 4 is connected to the second-stage planetary gear assembly 5; each planetary gear II 10 also meshes with the straight teeth of the mounting base 3. The cam 12 is located on the other side of the gear seat II 11 and is integrally connected with the gear seat II 11. The sliding sleeve 14 is sleeved on the cam 12. One end of the rotating shaft 13 is fixedly connected to the sun gear I 6, and the other end of the rotating shaft 13 is embedded in the housing 18 and is slidably connected to the housing 18. The rotating shaft 13 passes through the gear seat I 8, the gear seat II 11, and the cam 12, and the gear seat I 8, the gear seat II 11, and the cam 12 are all slidably connected to the rotating shaft 13.

[0022] The plunger pump component is provided with a plunger rod 15, a transmission slider 16, and a return spring 17. The transmission slider 16 is slidably installed on the housing 18. The sliding direction of the transmission slider 16 is parallel to the center line of the plunger rod 15. One end of the transmission slider 16 is connected to the cam 12 in a butting manner, and the other end of the transmission slider 16 is fixedly connected to the plunger rod 15. In this way, the cam 12 is located in the extending direction of the plunger rod 15 of the plunger pump component, and the plunger rod 15 is connected to the cam 12 through the transmission slider 16. The center line of the output shaft of the motor 1 is perpendicular to the center line of the plunger rod 15. The return spring 17 is sleeved outside the plunger rod 15. One end of the return spring 17 is connected to the transmission slider 16 in a butting manner, and the other end of the return spring 17 is connected to the housing 18 in a butting manner. The return spring 17 is always in a compressed state. The return spring 17 always has a tendency to push the transmission slider 16 towards the position where the cam 12 is located. Similarly, the return spring 17 always has a tendency to push the plunger rod 15 towards the position where the cam 12 is located. In the initial state, the transmission slider 16 presses against the cam 12, and the two are in butt contact. Since the sliding sleeve 14 is installed outside the cam 12, the cam 12 and the transmission slider 16 are in direct contact through the sliding sleeve 14.

[0023] During operation, the motor 1 drives the planetary reduction mechanism 2 to operate. Inside the planetary reduction mechanism 2, the sun gear I 6 drives the planetary gear I 7 to rotate. The planetary gear I 7 revolves around the sun gear I 6 under the influence of the straight teeth of the mounting seat 3 and rotates on its own at the same time. The gear seat I 8 is driven to rotate, and further the sun gear II 9 rotates. The planetary gear II 10 revolves around the sun gear II 9 under the influence of the straight teeth of the mounting seat 3 and rotates on its own at the same time. The gear seat II 11 is driven to rotate, and further the cam 12 rotates. The rotating cam 12 drives the transmission slider 16 to move. The transmission slider 16 will move towards the position where the plunger rod 15 is located. The transmission slider 16 directly pushes the plunger rod 15 and the return spring 17. The return spring 17 is compressed, and the plunger rod 15 undergoes translation. Then, the transmission slider 16 will move in the direction away from the plunger rod 15. The return spring 17 pushes the transmission slider 16 in the direction away from the plunger rod 15, and the plunger rod 15 translates in the reverse direction. This process repeats as the cam 12 rotates. Thus, the plunger rod 15 makes a reciprocating motion, and the plunger pump component starts to deliver grease.

Claims

1. A grease pump, comprising a power component, a plunger pump component, and a housing (18), wherein the power component and the plunger pump component are mounted on the housing (18), and the power component is connected to the plunger pump component, characterized in that: The power component comprises a motor (1) and a planetary reduction mechanism (2). The motor (1) and the planetary reduction mechanism (2) are fixedly mounted on a housing (18). The planetary reduction mechanism (2) is located in the extension direction of the output shaft of the motor (1). The planetary reduction mechanism (2) comprises a mounting seat (3), a primary planetary gear assembly (4), and a secondary planetary gear assembly (5). The primary planetary gear assembly (4) and the secondary planetary gear assembly (5) are both movably mounted inside the mounting seat (3). The output shaft of the motor (1) is connected to the primary planetary gear assembly ( 4), the first-stage planetary gear assembly (4) is connected to the second-stage planetary gear assembly (5), a cam (12) is provided on the second-stage planetary gear assembly (5), the cam (12) is located in the extension direction of the plunger rod (15) of the plunger pump component, the center line of the output shaft of the motor (1) is perpendicular to the center line of the plunger rod (15), the plunger pump component is provided with a return spring (17) for pushing the plunger rod (15) toward the position of the cam (12), and the cam (12) is connected to the plunger rod (15) of the plunger pump component in an abutting manner.

2. The grease pump according to claim 1, characterized in that: The plunger pump component is further provided with a transmission slider (16), the transmission slider (16) being mounted on the housing (18) in a sliding manner, the sliding direction of the transmission slider (16) being parallel to the center line of the plunger rod (15), the plunger rod (15) being connected to the cam (12) via the transmission slider (16), one end of the transmission slider (16) being connected to the cam (12) in an abutting manner, the other end of the transmission slider (16) being fixedly connected to the plunger rod (15), one end of the return spring (17) being connected to the transmission slider (16) in an abutting manner, and the return spring (17) pressing the transmission slider (16) toward the position where the cam (12) is located.

3. The grease pump according to claim 1, characterized in that: The mounting seat (3) is provided with a mounting channel, and the mounting seat (3) is provided with spur teeth, and the spur teeth extend into the mounting channel. The first-stage planetary gear assembly (4) includes a sun gear I (6), a planetary gear I (7), and a gear seat I (8). The sun gear I (6) is mounted on the output shaft of the motor (1). Three planetary gears I (7) are mounted on one side of the gear seat I (8). The sun gear I (6) is located between the three planetary gears I (7). The sun gear I (6) is meshed with the planetary gear I (7). The planetary gear I (7) is meshed with the spur teeth of the mounting seat (3). The second-stage planetary gear assembly (5) includes a sun gear II (9), a planetary gear II (10), a gear seat II (11), and a rotating shaft (13). The sun gear II (9) is located on the other side of the gear seat I (8) and the sun gear II (9) is meshed with the gear seat I (7). The gear seat Ⅰ (8) is connected as a whole, three planetary gears Ⅱ (10) are installed on one side of the gear seat Ⅱ (11), the sun gear Ⅱ (9) is located between the three planetary gears Ⅱ (10), the sun gear Ⅱ (9) is meshed with the planetary gear Ⅱ (10), the planetary gear Ⅱ (10) is meshed with the straight teeth of the mounting seat (3), the cam (12) is located on the other side of the gear seat Ⅱ (11) and the cam (12) is connected as a whole with the gear seat Ⅱ (11), one end of the rotating shaft (13) is fixedly connected with the sun gear Ⅰ (6), the other end of the rotating shaft (13) is embedded in the housing (18) and is slidably connected with the housing (18), the rotating shaft (13) passes through the gear seat Ⅰ (8), the gear seat Ⅱ (11), and the cam (12), and the gear seat Ⅰ (8), the gear seat Ⅱ (11), and the cam (12) are all slidably connected with the rotating shaft (13).

4. The grease pump according to claim 1, characterized in that: A sliding sleeve (14) is installed outside the cam (12).

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