Novel oil distribution structure and excavator hydraulic pump

Abstract

The utility model relates to the technical field of hydraulic pumps, in particular to a novel oil distribution structure and an excavator hydraulic pump, the novel oil distribution structure comprises a cylinder body, a plunger and an oil distribution disc, the oil distribution disc is provided with an installation cavity, the installation cavity is located between the end portion of an oil suction channel and the end portion of an oil discharge channel, a dirt collection disc is detachably arranged in the installation cavity, and the plunger is arranged in the dirt collection disc. The opening end of the dirt collecting disc faces the cylinder body, and a magnetic block used for magnetically adsorbing metal powder is arranged in the dirt collecting disc. The dirt collecting disc is arranged between the end of the oil suction channel and the end of the oil discharge channel of the oil distribution disc, the magnetic block used for magnetically adsorbing metal powder is arranged in the dirt collecting disc, the metal powder fallen off due to friction between the cylinder body and the dirt collecting disc can be mixed with oil, the mixed oil can pass through the dirt collecting disc, and under the magnetic force action of the magnetic block, the oil can be separated from the cylinder body. And the metal powder is adsorbed into the dirt collecting disc, so that the cleaning effect is achieved, and the abrasion between the cylinder body and the dirt collecting disc is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic pumps, and more particularly to a novel oil distribution structure and an excavator hydraulic pump. Background Art

[0002] Almost all the actions of an excavator are driven by a hydraulic system, and the core component of the hydraulic system is a hydraulic piston pump, which provides sufficient oil pressure for the entire hydraulic system. The hydraulic motor that drives the excavator to move forward, the hydraulic cylinder that drives the excavating arm to move, etc. are all powered by the hydraulic piston pump, and the hydraulic piston pump is driven by the diesel engine of the excavator.

[0003] Axial piston pumps are used in excavators, which have the advantages of simple structure, small volume, low noise, high efficiency, long service life and self-priming ability. However, since the axial piston pump uses a distribution plate for oil distribution, the rotation of the cylinder block will cause friction with the distribution plate, and the metal powder shed by the friction is adsorbed in the hydraulic oil, resulting in increased friction between the cylinder block and the distribution plate, which is likely to cause an increase in the gap between the cylinder block and the distribution plate, insufficient sealing, and a decrease in the pressure of oil absorption and oil discharge. Summary of the Utility Model

[0004] In view of the technical problems existing in the distribution plate in the prior art, a novel oil distribution structure and an excavator hydraulic pump are proposed in the first aspect of the present utility model, including:

[0005] A cylinder block provided with a plurality of cavities distributed circumferentially;

[0006] Plungers corresponding to the number of the cavities are respectively arranged in the cavities, and the plungers are arranged to reciprocate in the cavities and can suck oil into the cavities and pump it out;

[0007] A distribution plate is arranged at the oil distribution end of the cylinder block and is in sliding contact with the oil distribution end of the cylinder block. The distribution plate is provided with an oil suction channel and an oil discharge channel corresponding to the cavities;

[0008] Wherein, an installation cavity is formed on the distribution plate, and the installation cavity is located between the ends of the oil suction channel and the oil discharge channel. A dirt collection plate is detachably arranged in the installation cavity. The dirt collection plate is arranged in a disc-shaped structure with an opening at one end, and the opening end of the dirt collection plate faces the cylinder block for collecting the metal powder generated by the friction between the cylinder block and the distribution plate;

[0009] A magnetic block for magnetically adsorbing metal powder is arranged inside the dirt collection plate.

[0010] Preferably, the dirt collection plate is arranged at the tail end of the oil discharge channel.

[0011] Preferably, a check diaphragm with a cut is fixed at the open end of the dirt collecting tray, so that the metal powder can enter the dirt collecting tray through the cut and is blocked from flowing back by the check diaphragm.

[0012] Preferably, the magnet is a neodymium iron boron magnet, and the distance between the magnet and the check diaphragm is 1.0 - 3.0 mm.

[0013] Preferably, the material of the check diaphragm is polytetrafluoroethylene.

[0014] Preferably, the diameter of the open end of the dirt collecting tray is the same as the inner diameter of the cavity.

[0015] Preferably, the installation cavity is arranged as a threaded hole, an external thread is provided on the outer side wall of the dirt collecting tray, and the dirt collecting tray is detachably connected to the installation cavity by threads.

[0016] Preferably, the magnet is arranged at the inner bottom end of the dirt collecting tray, and the dirt collecting tray is detachably connected to the installation cavity by the magnetic attraction of the magnet.

[0017] In a second aspect of the present invention, an excavator hydraulic pump is proposed, including:

[0018] A pump body, with a drive shaft arranged inside, and one end of the drive shaft extends to the outside of the pump body for connection with an external drive device;

[0019] The above-mentioned new oil distribution structure, wherein the cylinder block in the new oil distribution structure is connected to the drive shaft and is arranged to rotate synchronously with the drive shaft;

[0020] An inclined plate, arranged at one end of the cylinder block away from the oil distribution disc, and one end of the plunger is connected to the inclined plate;

[0021] Wherein, when the cylinder block rotates one week, the plunger reciprocates once in the cavity.

[0022] Preferably, a control valve assembly is arranged on the pump body to adjust the inclination angle of the inclined plate so as to change the stroke of the plunger.

[0023] Compared with the prior art, the advantages of the present invention are as follows:

[0024] By arranging a dirt collecting tray between the ends of the oil suction channel and the oil discharge channel of the oil distribution disc, and a magnet for magnetically adsorbing metal powder is arranged inside the dirt collecting tray. When the cylinder block rotates, the metal powder rubbed off between the cylinder block and the dirt collecting tray will be mixed with the oil, increasing the fluidity of the metal powder. Driven by the rotational force, the mixed oil will pass through the dirt collecting tray. Under the magnetic force of the magnet, the metal powder is adsorbed into the dirt collecting tray, playing a cleaning role and reducing the wear between the cylinder block and the dirt collecting tray. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in each figure may be denoted by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present utility model will be described by way of example and with reference to the drawings, wherein:

[0026] Figure 1 is a schematic structural diagram of the novel oil distribution structure and the excavator hydraulic pump shown in the present utility model;

[0027] Figure 2 is a schematic structural diagram of the novel oil distribution structure and the oil distribution disc in the excavator hydraulic pump shown in the present utility model;

[0028] Figure 3 is a schematic structural diagram of the novel oil distribution structure and the dirt collecting disc in the excavator hydraulic pump shown in the present utility model.

[0029] 1. Pump body; 11. Drive shaft; 12. Cylinder block; 13. Cavity; 14. Plunger; 15. Swash plate; 16. Slipper; 2. Control valve assembly; 3. Oil distribution disc; 301. Suction oil passage; 302. Discharge oil passage; 303. Installation cavity; 4. Dirt collecting disc; 41. Check diaphragm; 411. Cut; 42. Magnet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to better understand the technical content of the present utility model, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows.

[0031] Combined with Figures 1 - 3 as shown, the present utility model provides a novel oil distribution structure, including a cylinder block 12, a plunger 14 and an oil distribution disc 3.

[0032] The cylinder block 12 is provided with a plurality of cavities 13 distributed circumferentially, and a corresponding number of plungers 14, which are slidably connected to the cavities 13 one by one. As the cylinder block 12 rotates, the plungers 14 reciprocate in the cavities 13, and for each rotation of the cylinder block 12, the plungers 14 reciprocate in the cavities 13 once;

[0033] The oil distribution disc 3 is arranged at the oil distribution end of the cylinder block 12 and is in sliding contact with the oil distribution end of the cylinder block 12. An oil suction passage 301 and an oil discharge passage 302 corresponding to the cavity 13 are provided on the oil distribution disc 3. When the cylinder block 12 rotates and the plunger 14 is in the area of the oil suction passage 301, the plunger 14 moves away from the oil distribution disc 3, the volume of the cavity 13 increases, and hydraulic oil is sucked in. When the cylinder block 12 rotates and the plunger 14 is in the area of the oil discharge passage 302, the plunger 14 moves closer to the oil distribution disc 3, the volume of the cavity 13 decreases, and hydraulic oil is output. Then, the flow direction of the hydraulic oil is controlled by a control valve to drive the excavator to operate.

[0034] To ensure the sealing performance of oil suction and discharge, the clearance between the cylinder block and the oil distribution disc is small. When the cylinder block rotates, it will rub against the oil distribution disc, and the metal powder shed by the friction is adsorbed in the hydraulic oil, resulting in increased friction between the cylinder block and the oil distribution disc, which is likely to cause an increase in the clearance between the cylinder block and the oil distribution disc, insufficient sealing performance, and a decrease in the pressure of oil suction and discharge.

[0035] Combined Figure 2 and Figure 3 As shown, an installation cavity 303 is provided on the dirt collecting disc 4, and the installation cavity 303 is located between the ends of the oil suction passage 301 and the oil discharge passage 302. A dirt collecting disc 4 is detachably installed in the installation cavity 303. The dirt collecting disc 4 is arranged in a disc-shaped structure with one end having an opening, and the opening end of the dirt collecting disc 4 faces the cylinder block 12, which is used to collect the metal powder generated by the friction between the cylinder block 12 and the oil distribution disc 3. A magnetic block 42 for magnetically adsorbing metal powder is provided inside the dirt collecting disc 4.

[0036] When the cylinder block 12 rotates, the metal powder shed by the friction between the cylinder block 12 and the dirt collecting disc 4 will mix with the oil fluid, increasing the fluidity of the metal powder. Driven by the rotational force, the mixed oil fluid will pass through the dirt collecting disc 4. Under the magnetic force of the magnetic block 42, the metal powder is adsorbed into the dirt collecting disc 4, playing a cleaning role and reducing the wear between the cylinder block 12 and the dirt collecting disc 4.

[0037] Furthermore, the dirt collecting disc 4 is arranged at the tail end of the oil discharge passage 302. When the cavity 13 of the cylinder block 12 passes through the dirt collecting disc 4, it is in a state where the oil fluid has been completely discharged, and the cavity 13 will not be affected by the loss of oil pressure due to the increase in volume.

[0038] In an alternative embodiment, the magnetic block 42 is a neodymium iron boron magnet, which has strong magnetism and better magnetic adsorption ability.

[0039] Furthermore, the distance between the magnetic block 42 and the check diaphragm 41 is 1.0 - 3.0 mm, preferably 3.0 mm. This allows for sufficient distance between the magnetic block 42 and the check diaphragm 41 to avoid the magnetic block 42 affecting the check diaphragm 41 after adsorbing metal powder.

[0040] Combined Figure 3 As shown, the diameter of the open end of the oil collecting pan 4 is the same as the inner diameter of the cavity 13, so that when the cavity 13 corresponds to the open end of the oil collecting pan 4, the metal powder adhering to the inner wall of the cavity 13 can also smoothly flow into the oil collecting pan 4, and there will be no step interference in the flow path.

[0041] Combined Figure 3 As shown, a check diaphragm 41 with a notch 411 is fixed at the open end of the oil collecting pan 4. The check diaphragm 41 is an elastic sheet. When the cylinder block 12 rotates relative to the oil collecting pan 4, the flowing oil will deform the check diaphragm 41, opening the notch 411. The oil mixed with metal powder can enter the oil collecting pan 4 through the notch 411 and is blocked from flowing back by the check diaphragm 41.

[0042] Furthermore, the notch 411 is set as a cross-shaped notch, so that the check diaphragm 41 can be deformed under the action of a relatively small force.

[0043] In an alternative embodiment, the material of the check diaphragm 41 is polytetrafluoroethylene, and its surface friction coefficient is extremely low. When it comes into contact and friction with the cylinder block 12 and the oil, the wear is small and the service life is long.

[0044] Combined Figure 2 and Figure 3 As shown, an external thread is provided on the outer side wall of the oil collecting pan 4. The oil collecting pan 4 is detachably connected to the installation cavity 303 by means of the thread, which is convenient for later maintenance and replacement.

[0045] In an alternative embodiment, the magnetic block 42 is arranged at the inner bottom end of the oil collecting pan 4. The oil collecting pan 4 can also be detachably connected to the installation cavity 303 by the magnetic attraction of the magnetic block 42. The later maintenance and replacement speed is faster, and there is no need to machine threads, saving the processing and production time of parts.

[0046] In the second aspect of the present utility model, an excavator hydraulic pump is proposed, including: a pump body 1, a plunger 14, a swash plate 15, a control valve assembly 2 and the above-mentioned new oil distribution structure;

[0047] A drive shaft 11 is arranged inside the pump body 1. One end of the drive shaft 11 extends to the outside of the pump body 1 and is used to connect to the output end of the engine of the excavator. The cylinder block 12 is arranged in the pump body 1 and is connected to the drive shaft 11. The engine drives the cylinder block 12 to rotate through the drive shaft 11.

[0048] The swash plate 15 is arranged at one end of the cylinder block 12 away from the oil distribution plate 3. A slipper 16 is provided between the plunger 14 and the swash plate 15. A spherical seat for movably connecting with the slipper 16 is provided on the plunger 14. The plunger 14 is connected to the swash plate 15 through the slipper 16. As the cylinder block 12 rotates, the plunger 14 reciprocates in the cavity 13. And for each rotation of the cylinder block 12, the plunger 14 reciprocates once in the cavity 13.

[0049] The oil distribution plate 3 is arranged at the oil distribution end of the cylinder block 12 and is in sliding contact with the oil distribution end of the cylinder block 12. An oil suction channel 301 and an oil discharge channel 302 corresponding to the cavity 13 are opened on the oil distribution plate 3. Hydraulic oil flow channels corresponding to the oil suction channel 301 and the oil discharge channel 302 are opened on the pump body 1. When the cylinder block 12 rotates and the plunger 14 is in the area of the oil suction channel 301, the plunger 14 moves to the side away from the oil distribution plate 3, and the volume of the cavity 13 increases, sucking in hydraulic oil. When the cylinder block 12 rotates and the plunger 14 is in the area of the oil discharge channel 302, the plunger 14 moves to the side close to the oil distribution plate 3, and the volume of the cavity 13 decreases, discharging hydraulic oil. Then, the flow direction of the hydraulic oil is controlled by a control valve to realize driving the excavator to act.

[0050] The control valve assembly 2 is arranged on the pump body 1 and can adjust the inclination angle of the swash plate 15 to change the stroke of the plunger 14.

[0051] In a specific embodiment, the control valve assembly 2 includes an electric valve and a linkage mechanism. The action of the linkage mechanism is controlled by the electric valve, so as to adjust the inclination angle of the swash plate 15 to change the output oil volume for each reciprocation of the plunger 14.

[0052] Combined with the above embodiments, by arranging a dirt collecting plate 4 between the ends of the oil suction channel 301 and the oil discharge channel 302 of the oil distribution plate 3, a magnetic block 42 for magnetically adsorbing metal powder is arranged inside the dirt collecting plate 4. When the cylinder block 12 rotates, the metal powder rubbed off between the cylinder block 12 and the dirt collecting plate 4 will be mixed with the oil fluid, increasing the fluidity of the metal powder. Driven by the rotational force, the mixed oil fluid will pass through the dirt collecting plate 4. Under the magnetic force of the magnetic block 42, the metal powder is adsorbed into the dirt collecting plate 4, playing a cleaning role and reducing the wear between the cylinder block 12 and the dirt collecting plate 4.

[0053] Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Those with ordinary knowledge in the technical field to which the present utility model belongs can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to what is defined by the claims.

Claims

1. New oil distribution structure, characterized by: include: The cylinder body (12) is provided with a plurality of cavities (13) distributed along the circumferential direction; A number of plungers (14) corresponding to the number of the cavities (13) are respectively arranged in the cavities (13); the plungers (14) are arranged to reciprocate in the cavities (13) and can suck oil into the cavities (13) and pump it out; An oil distribution plate (3) is arranged at the oil distribution end of the cylinder body (12) and is in sliding contact with the oil distribution end of the cylinder body (12); the oil distribution plate (3) is provided with an oil suction channel (301) and an oil discharge channel (302) corresponding to the cavity (13); The oil distribution plate (3) is provided with a mounting cavity (303), and the mounting cavity (303) is located between the ends of the oil suction channel (301) and the oil discharge channel (302). A detachable dirt collecting plate (4) is provided in the mounting cavity (303), and the dirt collecting plate (4) is configured as a disc-shaped structure with an opening at one end, and the opening end of the dirt collecting plate (4) faces the cylinder body (12), and is used to collect metal powder generated by friction between the cylinder body (12) and the oil distribution plate (3); A magnetic block (42) for magnetically absorbing metal powder is provided inside the dirt collecting tray (4).

2. The novel oil distribution structure according to claim 1 is characterized in that: The dirt collecting tray (4) is arranged at the rear end of the oil drain channel (302).

3. The novel oil distribution structure according to claim 1 is characterized in that: A non-return membrane (41) with a cutout (411) is fixed to the open end of the dirt collecting tray (4), so that metal powder can enter the dirt collecting tray (4) through the cutout (411) and be prevented from flowing back by the non-return membrane (41).

4. The novel oil distribution structure according to claim 3 is characterized in that: The magnetic block (42) is a neodymium iron boron magnet, and the distance between the magnetic block (42) and the non-return diaphragm (41) is 1.0-3.0 mm.

5. The novel oil distribution structure according to claim 3 is characterized in that: The material of the non-return diaphragm (41) is polytetrafluoroethylene.

6. The novel oil distribution structure according to claim 1 is characterized in that: The diameter of the opening end of the dirt collecting tray (4) is the same as the inner diameter of the cavity (13).

7. The novel oil distribution structure according to claim 1 is characterized in that: The installation cavity (303) is configured as a threaded hole, and an outer wall of the dirt collecting tray (4) is provided with an external thread, and the dirt collecting tray (4) is detachably connected to the installation cavity (303) via the thread.

8. The novel oil distribution structure according to claim 1 is characterized in that: The magnetic block (42) is arranged at the inner bottom end of the dirt collecting tray (4), and the dirt collecting tray (4) is detachably connected to the installation cavity (303) through the magnetic attraction of the magnetic block (42).

9. An excavator hydraulic pump, characterized in that: include: A pump body (1) is provided with a drive shaft (11) inside, and one end of the drive shaft (11) extends to the outside of the pump body (1) for connection with an external drive device; The novel oil distribution structure according to any one of claims 1 to 8, wherein the cylinder body (12) in the novel oil distribution structure is connected to the drive shaft (11) and is configured to rotate synchronously with the drive shaft (11); A swash plate (15) is arranged at one end of the cylinder body (12) away from the oil distribution plate (3), and one end of the plunger (14) is connected to the swash plate (15); Wherein, each time the cylinder body (12) rotates one circle, the plunger (14) reciprocates once in the cavity (13).

10. The excavator hydraulic pump according to claim 9, characterized in that: The pump body (1) is provided with a control valve assembly (2) for adjusting the inclination angle of the swash plate (15) so as to change the stroke of the plunger (14).

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