Grease pump

Abstract

The utility model 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, and the power part comprises a motor and a planetary reduction mechanism. A cam of the planetary speed reduction mechanism is connected with a plunger rod of the plunger pump component 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 utility model relates to a kind of grease pumps. BACKGROUND

[0002] The grease pump in prior art adopts the combination structure of motor and crank connecting rod mechanism to provide the power of reciprocating motion for internal plunger pump.For example, the utility model patent with the utility model name of semi-closed micro electric grease pump is disclosed on July 16, 2014, and the announcement number is CN203718352U, which is recorded in the patent document that it includes motor reducer, crank connecting rod mechanism, plunger and pump body, power-on starting, motor reducer drives plunger, i.e.plunger rod reciprocating motion through crank connecting rod mechanism, completes oil absorption and oil discharge process.Due to the problems of wear, looseness and the like of crank connecting rod mechanism in long-term operation, the movement process of plunger rod becomes unstable, and then causes the grease output to fluctuate and be in out-of-control state, which cannot meet the demand of precise grease output under various working conditions.In addition, crank connecting rod mechanism occupies large space when working, causing the volume of entire grease pump to be large. SUMMARY

[0003] The technical problem to be solved by the utility model is how to improve the stability of plunger rod movement, so that a grease pump with stable grease output is obtained.

[0004] To solve the above technical problem, the utility model adopts the following technical scheme: the grease pump includes power component, plunger pump component, shell, power component, plunger pump component are installed on shell, power component is connected with plunger pump component, power component includes motor, planetary reduction mechanism, motor, planetary reduction mechanism are fixedly installed on shell, planetary reduction mechanism is located in the extension direction of the output shaft of motor, planetary reduction mechanism includes mounting seat, primary planetary gear assembly, secondary planetary gear assembly, primary planetary gear assembly, secondary planetary gear assembly are movably installed inside mounting seat, the output shaft of motor is connected with primary planetary gear assembly, primary planetary gear assembly is connected with secondary planetary gear assembly, cam is provided on secondary planetary gear assembly, cam is located in the extension direction of plunger rod of plunger pump component, the center line of the output shaft of motor is perpendicular to the center line of plunger rod, plunger pump component is provided with reset spring for pushing plunger rod towards the location of cam, cam and plunger rod of plunger pump component are connected in abutting mode.

[0005] The power of the reciprocating movement of the plunger rod comes from the cam and the reset spring, and the power of the rotation of the cam comes from the planetary reduction mechanism, and the reset spring accumulates or releases potential energy through its own deformation. The grease pump adopts planetary reduction mechanism transmission, which can extremely accurately adjust the gear rotation speed and transmission ratio. With this characteristic, the movement speed of the plunger rod can be accurately controlled, and the output flow of the grease can be accurately controlled, fully meeting the high-precision demand for the amount of grease under various complex working conditions. The technical scheme discards the crank connecting rod mechanism, so that the overall structure is more compact, the occupied space is significantly reduced, and it is especially suitable for installation scenes with limited space, greatly improving the installation convenience and applicability. The use of planetary reduction mechanism can effectively avoid the structure design prone to wear and looseness, effectively reducing the failure 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 users a more efficient and economical use experience.

[0006] The force of the cam on the plunger rod is not all used to push its movement, and there is a part of power loss, the main reason is that the force contains a component force inclined to the extension direction of the plunger rod, the contact surface of the plunger rod and the external part is extremely small, the external part is the cylinder structure wrapped outside the plunger rod, the component force is different from the component force along the plunger rod, it will make the plunger rod extrude the external part, so that the friction force on the plunger rod increases, when the cam overcomes the larger friction force to do work, the thrust required for the linear movement of the plunger rod decreases accordingly. In order to reduce the loss of the cam transmitting power to the plunger rod, the plunger pump part is also provided with a transmission slider, the transmission slider is installed on the shell 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 with the cam through the transmission slider, one end of the transmission slider is connected with the cam in an abutting manner, the other end of the transmission slider is fixedly connected with the plunger rod, one end of the reset spring is connected with the transmission slider in an abutting manner, and the reset spring extrudes the transmission slider towards the position of the cam. The transmission slider and the shell are connected with a large contact surface, no matter how the cam extrudes the shell, the two can maintain a sliding connection relationship with a low friction coefficient, and the situation that the cam overcomes the friction force to do work is weakened, so the transmission efficiency of the cam driving the transmission slider to the plunger rod is improved.

[0007] The utility model provides an optimized scheme of planetary reduction mechanism, be equipped with installation passageway on the mounting seat, be equipped with straight tooth on the mounting seat, the straight tooth is inserted into the installation passageway, the first planetary gear assembly includes sun gear I, planetary gear I, gear seat I, the sun gear I is installed on the output shaft of motor, gear seat I installs three planetary gears I on one side, the sun gear I is located between three planetary gears I, the sun gear I engages with planetary gear I, planetary gear I engages with the straight tooth of mounting seat, the second planetary gear assembly includes sun gear II, planetary gear II, gear seat II, pivot, sun gear II is located on the other side of gear seat I and sun gear II is integrated with gear seat I, gear seat II installs three planetary gears II on one side, the sun gear II is located between three planetary gears II, the sun gear II engages with planetary gear II, planetary gear II engages with the straight tooth of mounting seat, the cam is located on the other side of gear seat II and the cam is integrated with gear seat II, one end of pivot is fixedly connected with sun gear I, the other end of pivot is embedded in the shell and is slidably connected with the shell, pivot passes through gear seat I, gear seat II, cam, gear seat I, gear seat II, cam are slidably connected with pivot. This planetary reduction mechanism has the advantages of small size, large transmission ratio design range.

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

[0009] The utility model discloses the technical scheme above: the transmission structure of grease pump is optimized, and the transmission structure obtains the advantages such as transmission stability, compact structure and reduced wear. Thus, the reliability and stability of the grease pump are greatly improved, maintenance cost is also reduced, and more efficient and economical use experience is brought to users. BRIEF DESCRIPTION OF DRAWINGS

[0010] The utility model will be further specifically explained in connection with the drawings and specific embodiment.

[0011] Figure 1 For the power component and plunger pump component combination structure of the utility model a grease pump Figure I ;

[0012] Figure 2 For the power component and plunger pump component combination structure of the utility model a grease pump Figure II ;

[0013] Figure 3 For the power component and plunger pump component combination structure of the utility model a grease pump Figure III ;

[0014] Figure 4A planetary reduction mechanism and a transmission sliding block component combined structure schematic view of the grease pump of the utility model;

[0015] Figure 5 A planetary reduction mechanism structure schematic view of the utility model of the grease pump Figure I ;

[0016] Figure 6 A planetary reduction mechanism structure schematic view of the utility model of the grease pump Figure II ;

[0017] Figure 7 A first planetary gear assembly structure schematic view of the utility model of the grease pump;

[0018] Figure 8 A second planetary gear assembly structure schematic view of the utility model of the grease pump. DETAILED DESCRIPTION

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

[0020] The power component includes a motor 1, a planetary reduction mechanism 2, and the motor 1 and the planetary reduction mechanism 2 are fixedly installed on the shell 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 includes a mounting seat 3, a first planetary gear assembly 4, and a second planetary gear assembly 5. The first planetary gear assembly 4 and the second planetary gear assembly 5 are movably installed inside the mounting seat 3.

[0021] The mounting seat 3 is fixed on the shell 18, and the mounting seat 3 is internally provided with a mounting channel, and the mounting seat 3 is provided with straight teeth which extend into the mounting channel, and the straight teeth form a tooth ring at the mounting channel. The first-stage planetary gear assembly 4 comprises a sun gear I 6, a planet 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 with the first-stage planetary gear assembly 4. The gear seat I 8 is provided with three planet gears I 7 on one side, and the sun gear I 6 is located between the three planet gears I 7, and the sun gear I 6 is engaged with each planet gear I 7, and each planet gear I 7 is also engaged with the straight teeth of the mounting seat 3. The second-stage planetary gear assembly 5 comprises a sun gear II 9, a planet 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 integrated with the gear seat I 8, and the sun gear II 9 rotates synchronously when the gear seat I 8 rotates. The gear seat II 11 is provided with three planet gears II 10 on one side, and the sun gear II 9 is located between the three planet gears II 10, and the sun gear II 9 is engaged with each planet gear II 10, so that the first-stage planetary gear assembly 4 is connected with the second-stage planetary gear assembly 5; and each planet gear II 10 is also engaged 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 is integrated 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 with the sun gear I 6, and the other end of the rotating shaft 13 is embedded in the shell 18 and is slidingly connected with the shell 18, and the rotating shaft 13 penetrates 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 slidingly connected with the rotating shaft 13.

[0022] The plunger pump component is provided with a plunger rod 15, a transmission sliding block 16 and a return spring 17. The transmission sliding block 16 is slidingly installed on the shell 18, and the sliding direction of the transmission sliding block 16 is parallel to the center line of the plunger rod 15, one end of the transmission sliding block 16 is connected with the cam 12 in an abutting manner, and the other end of the transmission sliding block 16 is fixedly connected with the plunger rod 15, so that the cam 12 is located in the extension direction of the plunger rod 15 of the plunger pump component, and the plunger rod 15 is connected with the cam 12 through the transmission sliding block 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 with the transmission sliding block 16 in an abutting manner, and the other end of the return spring 17 is connected with the shell 18 in an abutting manner, the return spring 17 is always in a compressed state, the return spring 17 always has a tendency to drive the transmission sliding block 16 to move towards the position of the cam 12, and the return spring 17 always has a tendency to drive the plunger rod 15 to move towards the position of the cam 12. In the initial state, the transmission sliding block 16 presses the cam 12, and the two abut, and because the sliding sleeve 14 is installed outside the cam 12, the cam 12 and the transmission sliding block 16 are in direct contact with the sliding sleeve 14.

[0023] In 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 is affected by the straight teeth of the mounting seat 3 to revolve around the sun gear I 6 and simultaneously rotate itself, the gear seat I 8 is driven to rotate, and further the sun gear II 9 rotates; the planetary gear II 10 is affected by the straight teeth of the mounting seat 3 to revolve around the sun gear II 9 and simultaneously rotate itself, 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, the plunger rod 15 translates, then, the transmission slider 16 will move away from the plunger rod 15, the return spring 17 pushes the transmission slider 16 to move away from the plunger rod 15, the plunger rod 15 reversely translates again, and the process is repeated with the rotation of the cam 12. In this way, the plunger rod 15 reciprocates, and the plunger pump part starts to deliver grease.

Claims

1. A grease pump comprising a power unit, a plunger pump unit, a housing (18), the power unit and the plunger pump unit being mounted on the housing (18), the power unit being connected to the plunger pump unit, 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 installed on a shell (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 movably installed inside the mounting seat (3), the output shaft of the motor (1) is connected with the primary planetary gear assembly (4), the primary planetary gear assembly (4) is connected with the secondary planetary gear assembly (5), the secondary planetary gear assembly (5) is provided with a cam (12), 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) towards the position of the cam (12), and the cam (12) is connected with the plunger rod (15) of the plunger pump component in an abutting mode.

2. The grease pump of claim 1, wherein: The plunger pump component is also provided with a transmission sliding block (16), the transmission sliding block (16) is slidably installed on the shell (18), the sliding direction of the transmission sliding block (16) is parallel to the center line of the plunger rod (15), the plunger rod (15) is connected with the cam (12) through the transmission sliding block (16), one end of the transmission sliding block (16) is connected with the cam (12) in an abutting mode, the other end of the transmission sliding block (16) is fixedly connected with the plunger rod (15), one end of the return spring (17) is connected with the transmission sliding block (16) in an abutting mode, and the return spring (17) extrudes the transmission sliding block (16) towards the position of the cam (12).

3. The grease pump of claim 1, wherein: The mounting seat (3) is provided with a mounting channel, and the mounting seat (3) is provided with straight teeth which extend into the mounting channel, the primary planetary gear assembly (4) comprises 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 engaged with the planetary gear I (7), the planetary gear I (7) is engaged with the straight teeth of the mounting seat (3), the secondary planetary gear assembly (5) comprises 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 is integrated with the gear seat I (8), three planetary gears II (10) are mounted 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 engaged with the planetary gear II (10), the planetary gear II (10) is engaged 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 is integrated 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 into the shell (18) and is slidably connected with the shell (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 slidably connected with the rotating shaft (13).

4. The grease pump of claim 1, wherein: The cam (12) is externally provided with a sliding sleeve (14).

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