A device for a toroidal piston variable displacement hydraulic pump

Abstract

The application discloses a device of a circular ring type plunger variable hydraulic pump, which comprises a base, a curved rod, a piston, a swing rod two, a rear cover, a connecting rod five, a connecting rod six, a compression bolt, a connecting rod eight and a main shaft two. The base is fixedly connected with the rear cover through welding. The outer side of the rear cover is in butt joint with a sealing gasket and a front cover, and the sealing gasket, the front cover and the rear cover are fixed through bolts. The device of the circular ring type plunger variable hydraulic pump can reduce the volume of the whole device in the axial direction while pumping oil. Only a given signal is needed to operate the driving circuit of the stepping motor, so that the stepping motor rotates at a corresponding speed and rotates a corresponding number of turns. The gear installed on the stepping motor drives the rack to move a corresponding distance, so that three groups of hinges move, the distance of the linear motion of the other end of the connecting rod two is changed, the included angle of the connecting rod one and the connecting rod three is changed, the swing angle of the swing rod one and the swing rod two is changed, and then the movement distance of the piston is changed, so that the variable oil pumping is realized.

Description

Technical Field

[0001] This invention relates to the field of hydraulic pump technology, specifically to a device for a circular piston variable hydraulic pump. Background Technology

[0002] Hydraulic pumps are common mechanical devices and are widely used in various industrial fields.

[0003] For example, a variable displacement mechanism for an axial piston hydraulic pump, disclosed in CN218206939U, includes: an upper housing, on which a first connecting end cover is fixedly installed at the lower left side; the lower ends of the first and second connecting end covers are fixedly connected to a lower housing; a connecting rod that passes through the interior of the upper housing; a mounting groove formed at the right end of the variable piston, the right end of which is connected to a connecting assembly; and a spring connected to the lower end of the variable piston. This variable displacement mechanism for an axial piston hydraulic pump reduces wear caused by swashplate movement, improving practicality, and simultaneously solves the problem of poor sealing at the connection between the rod and the housing in existing variable displacement mechanisms for axial piston hydraulic pumps.

[0004] However, its internal components are mostly rigid and connected by sliding or rotating pairs, which makes the hydraulic pump too large in the shaft diameter direction, making it unsuitable for use under special production conditions.

[0005] If a device for producing a circular piston variable hydraulic pump could be manufactured that could pump oil in a variable manner while reducing the overall volume of the device in the radial direction, such a transposition would undoubtedly be welcomed in the market. Summary of the Invention

[0006] The purpose of this invention is to provide a device for a circular piston variable hydraulic pump, in order to solve the problem mentioned in the background art that the internal components are mostly rigid and connected by sliding or rotating joints, which makes the hydraulic pump too large in the axial direction and unsuitable for use under special production conditions.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a device for a circular piston variable hydraulic pump, comprising a base, connecting rod one, connecting rod three, crank rod, rocker rod one, one-way valve, piston, rocker rod two, rear cover, oil outlet ring, oil inlet ring, rack, connecting rod five, connecting rod six, clamping bolt, connecting rod eight, stepper motor and main shaft two. The base and the rear cover are welded and fixedly connected. The outer side of the rear cover is connected to the sealing gasket and the front cover and fixed to each other by bolts, forming four arc-shaped cavity areas. A partition is installed in the middle of each arc-shaped cavity to form two single-pass arc-shaped cavities. The end of the piston is installed in the single-pass arc-shaped cavity, and the sealing ring is installed on the outer side of the piston, forming an arc-shaped piston cylinder.

[0008] The crankshaft connects the pistons in adjacent plunger cylinders via hinges, and the two ends of the rocker arm two are connected to the crankshaft via hinges. The middle part of the rocker arm two is mounted on the outside of the main shaft two via a revolute joint. The two ends of the rocker arm one are connected to the crankshaft via hinges, and the middle part of the rocker arm one is mounted on the outside of the main shaft two via a revolute joint. The thrust ball bearing is mounted on the outside of the main shaft two. The clamping bolt is mounted on the outside of the main shaft two via a threaded connection to prevent the axial movement of the rocker arm one and the rocker arm two.

[0009] Link 8 is mounted on the outside of main shaft 1 via a hinge, and links 7 and 4 are mounted on the outside of link 8 via hinges, forming three sets of hinges.

[0010] Link 6 is hinged to the outside of links 7 and 4, and one end of link 6 is hinged to the outside of link 2. One end of link 1 is hinged to the outside of swing arm 2. Link 3 is hinged to the outside of swing arm 1. The other ends of links 1, 2 and 3 are hinged together. One end of link 5 is hinged to the outside of link 4, and one end of link 5 engages with a sliding ring through a groove, so that the sliding ring is locked in the groove at one end of link 5. One end of the rack is locked to the outside of the sliding ring through a groove, and rectangular grooves are engraved on both sides of the rack. The rack is mounted on the front cover through a sliding joint.

[0011] Furthermore, the main shaft is mounted on the outside of the front cover via a rotating joint, while the shaft end cover is mounted on the outside of the front cover via bolts, and the positions of the main shaft and the shaft end cover correspond to each other.

[0012] Furthermore, the second main shaft is installed on the outside of the rear cover, while the first shaft end cover is bolted to the outside of the rear cover, and the positions of the first shaft end cover and the second shaft end cover correspond to each other.

[0013] Furthermore, the stepper motor is bolted to the front cover, and a gear is mounted on the output end of the stepper motor. The gear and the rack form a gear pair that meshes with each other.

[0014] Furthermore, the oil outlet ring is bolted to the outside of the rear cover, and the oil groove inside the oil outlet ring is aligned with the oil outlet hole on the rear cover.

[0015] Furthermore, the oil inlet ring is bolted to the outside of the front cover, and the oil groove inside the oil inlet ring is aligned with the oil inlet hole on the front cover. The one-way valves are respectively installed on the outside of the oil inlet ring and the oil outlet ring, and the oil outlet pipe and the oil inlet pipe are installed on the outside of the one-way valves.

[0016] Furthermore, the stepper motor drive circuit mainly uses PMM8713 and SLA4061 chips. The speed of the stepper motor is determined by the input pulse frequency of the CK terminal of the PMM8713. The forward and reverse rotation of the stepper motor can be switched by adding a signal 1 or 0 to the U / D terminal.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] This annular piston variable hydraulic pump device can reduce the overall volume of the device in the axial direction while pumping oil in a variable manner. It only requires a signal to operate the stepper motor drive circuit, so that the stepper motor rotates a corresponding number of revolutions at a corresponding speed. The gear mounted on the stepper motor drives the rack to move a corresponding distance, causing the three sets of hinges to move. This changes the distance of linear motion of the other end of the second connecting rod, which in turn changes the included angle of the first and third connecting rods. The change in included angle changes the swing angle of the first and second swing rods, and then changes the movement distance of the piston, thus realizing variable oil pumping. This is beneficial for use under special production conditions and improves the practicality of the device. Attached Figure Description

[0019] Figure 1 This is a three-dimensional cross-sectional view of the present invention;

[0020] Figure 2 This is a front view structural diagram of the present invention;

[0021] Figure 3 This is a partially enlarged structural diagram of the main shaft of the present invention;

[0022] Figure 4 This is a top view of the structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the side sectional structure of the present invention;

[0024] Figure 6 This is a side sectional view of the clamping bolt of the present invention;

[0025] Figure 7 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 8 This is a schematic diagram of the stepper motor drive circuit of the present invention.

[0027] In the diagram: 1. Base; 2. Connecting rod one; 3. Connecting rod two; 4. Connecting rod three; 5. Crank rod; 6. Swing rod one; 7. Oil outlet; 8. Baffle plate; 9. One-way valve; 10. Oil outlet pipe; 11. Sealing gasket; 12. Sealing ring; 13. Bolt; 14. Piston; 15. Main shaft one; 16. Swing rod two; 17. Rear cover; 18. Shaft end cover one; 19. Oil outlet ring; 20. Oil inlet pipe; 21. Front cover; 22. Oil inlet ring; 23. Rack; 24. Connecting rod four; 25. Connecting rod five; 26. Connecting rod six; 27. Connecting rod seven; 28. Thrust ball bearing; 29. ​​Clamping bolt; 30. Connecting rod eight; 31. Shaft end cover two; 32. Stepper motor; 33. Gear; 34. Main shaft two; 35. Sliding element. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-8 The present invention provides a technical solution: a device for a circular piston variable hydraulic pump, comprising a base 1, connecting rod 1 2, connecting rod 2 3, connecting rod 3 4, crank rod 5, rocker rod 1 6, oil outlet 7, partition plate 8, one-way valve 9, oil outlet pipe 10, sealing gasket 11, sealing ring 12, bolt 13, piston 14, main shaft 1 15, rocker rod 2 16, rear cover 17, shaft end cover 1 18, oil outlet ring 19, oil inlet pipe 20, front cover 21, oil inlet ring 22, rack 23, connecting rod 4 24, connecting rod 5 25, connecting rod 6 26, connecting rod 7 27, thrust ball bearing 28, clamping bolt 29, connecting rod 8 30, shaft end cover 2 31, stepper motor 32, gear 33, main shaft 2 34, and sliding ring 35.

[0030] In this embodiment:

[0031] The base 1 is welded and fixedly connected to the rear cover 17. The outer side of the rear cover 17 is connected to the sealing gasket 11 and the front cover 21, and they are fixed to each other by bolts 13, forming four arc-shaped cavity areas. A partition 8 is installed in the middle of each arc-shaped cavity to form two single-pass arc-shaped cavities. The end of the piston 14 is installed in the single-pass arc-shaped cavity, and the sealing ring 12 is installed on the outside of the piston 14, forming an arc-shaped plunger cylinder.

[0032] The crank 5 is connected to the pistons 14 in the adjacent plunger cylinders by hinges, and the two ends of the rocker arm 16 are connected to the crank 5 by hinges. The middle part of the rocker arm 16 is installed on the outside of the main shaft 34 by a rotating joint. The two ends of the rocker arm 6 are connected to the crank 5 by hinges, and the middle part of the rocker arm 6 is installed on the outside of the main shaft 34 by a rotating joint. The thrust ball bearing 28 is installed on the outside of the main shaft 34. The clamping bolt 29 is installed on the outside of the main shaft 34 by a threaded connection to prevent the rocker arm 6 and the rocker arm 16 from moving axially.

[0033] Link 8 30 is mounted on the outside of main shaft 1 15 via a hinge, and link 7 27 and link 4 24 are mounted on the outside of link 8 30 via hinges, forming three sets of hinges.

[0034] Link 6 26 is hinged to the outside of link 7 27 and link 4 24, and one end of link 6 26 is hinged to the outside of link 2 3. One end of link 1 2 is hinged to the outside of swing arm 2 16. Link 3 4 is hinged to the outside of swing arm 1 6. The other ends of link 1 2, link 2 3 and link 3 4 are hinged together. One end of link 5 25 is hinged to the outside of link 4 24, and one end of link 5 25 engages with sliding ring 35 through a groove, so that sliding ring 35 is locked in the groove at one end of link 5 25. One end of rack 23 is locked to the outside of sliding ring 35 through a groove, and rack 23 has rectangular grooves engraved on both sides. Rack 23 is mounted on front cover 21 through a sliding joint.

[0035] Main shaft 15 is mounted on the outside of front cover 21 via a revolute joint, while shaft end cover 31 is mounted on the outside of front cover 21 via bolts 13, with the positions of main shaft 15 and shaft end cover 31 corresponding to each other. Main shaft 2 34 is mounted on the outside of rear cover 17, while shaft end cover 18 is connected to the outside of rear cover 17 via bolts 13, with the positions of shaft end cover 18 and shaft end cover 31 corresponding to each other. Stepper motor 32 is mounted on front cover 21 via bolts 13, while gear 33 is mounted on the output end of stepper motor 32, and gear 33 and rack 23 form a gear pair that meshes with each other. The oil outlet ring 19 is installed on the outside of the rear cover 17 by bolts 13, and the oil groove inside the oil outlet ring 19 is aligned with the oil outlet hole 7 on the rear cover 17; the oil inlet ring 22 is installed on the outside of the front cover 21 by bolts 13, and the oil groove inside the oil inlet ring 22 is aligned with the oil inlet hole on the front cover 21; the one-way valve 9 is installed on the outside of the oil inlet ring 22 and the oil outlet ring 19 respectively, and the oil outlet pipe 10 and the oil inlet pipe 20 are installed on the outside of the one-way valve 9.

[0036] The driving circuit of stepper motor 32 mainly uses PMM8713 and SLA4061 chips. The speed of stepper motor 32 is determined by the input pulse frequency of the CK terminal of PMM8713. The forward and reverse rotation of stepper motor 32 can be switched by adding a signal 1 or 0 to the U / D terminal.

[0037] When the pump is working, power is input from the main shaft 15, which rotates, driving connecting rods 5 25, 4 24, 8 30, 7 27, and 6 26 to rotate. Connecting rod 6 26 drives one end of connecting rod 2 3, which is connected to connecting rod 6 26, to rotate around the main shaft 15, while the other end of connecting rod 2 3 moves linearly, thereby driving connecting rods 1 2 and 3 4 to move, causing the included angle between connecting rods 1 2 and 3 4 to change. Connecting rods 1 2 and 3 4 respectively drive rocker arm 1 6 and rocker arm 2 16 to swing around the main shaft 2 34. Rocker arm 1 6 drives crank arm 5 to swing around the main shaft 2 34, and crank arm 5 drives piston 14 to perform compression motion along the arc-shaped plunger cylinder, thereby realizing oil pumping. When the hydraulic pump is working and sucking in oil, the hydraulic oil enters the check valve 9 through the oil inlet pipe 20, and then the oil inlet ring 22 distributes the hydraulic oil to each arc-shaped plunger cylinder; when pumping oil, the hydraulic oil enters the oil outlet ring 19 through the oil outlet hole 7, and the oil outlet ring 19 collects the oil pumped out by each arc-shaped plunger cylinder and discharges it through the check valve 9 from the oil outlet pipe 10.

[0038] To achieve variable displacement pumping, a signal is given to operate the drive circuit of stepper motor 32, causing stepper motor 32 to rotate a corresponding number of revolutions at a corresponding speed. The gear 33 mounted on stepper motor 32 drives rack 23 to move a corresponding distance. Rack 23 pulls sliding ring 35 to move linearly along main shaft 15. Sliding ring 35 drives connecting rod 4 24 to rotate, thereby changing the angle between connecting rod 4 24 and main shaft 15 in the axial direction. This causes the three sets of hinges to move, thereby changing the distance between connecting rod 6 26 and main shaft 15. This causes the radius of the rotational motion of one end of connecting rod 2 3 and connecting rod 6 26 around main shaft 15 to change, and the distance of linear motion of the other end of connecting rod 2 3 to change. This changes the angle between connecting rod 1 2 and connecting rod 3 4. The change in angle causes the swing angle of rocker arm 1 6 and rocker arm 2 16 to change, and then changes the movement distance of piston 14, thereby achieving variable displacement pumping.

[0039] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for a circular piston variable hydraulic pump, comprising a base (1), connecting rod one (2), connecting rod three (4), crank rod (5), rocker rod one (6), check valve (9), piston (14), rocker rod two (16), rear cover (17), oil outlet ring (19), oil inlet ring (22), rack (23), connecting rod five (25), connecting rod six (26), clamping bolt (29), connecting rod eight (30), stepper motor (32), and main shaft two (34), characterized in that: The base (1) is welded and fixedly connected to the rear cover (17). The outer side of the rear cover (17) is connected to the sealing gasket (11) and the front cover (21), and they are fixed to each other by bolts (13) to form four arc cavity areas. A partition (8) is installed in the middle of each arc cavity to form two single-pass arc cavities. The end of the piston (14) is installed in the single-pass arc cavity, and the sealing ring (12) is installed on the outside of the piston (14) to form an arc-shaped plunger cylinder. The crank (5) is connected to the pistons (14) in the adjacent plunger cylinders by hinges, and the two ends of the rocker arm (16) are connected to the crank (5) by hinges. The middle part of the rocker arm (16) is installed on the outside of the main shaft (34) by a rotating joint. The two ends of the rocker arm (6) are connected to the crank (5) by hinges. The middle part of the rocker arm (6) is installed on the outside of the main shaft (34) by a rotating joint. The thrust ball bearing (28) is installed on the outside of the main shaft (34). The clamping bolt (29) is installed on the outside of the main shaft (34) by a threaded connection to prevent the rocker arm (6) and the rocker arm (16) from moving axially. The connecting rod eight (30) is mounted on the outside of the main shaft one (15) by a hinge, and the connecting rod seven (27) and the connecting rod four (24) are mounted on the outside of the connecting rod eight (30) by a hinge, forming three sets of hinges; The sixth link (26) is hinged to the outside of the seventh link (27) and the fourth link (24), and one end of the sixth link (26) is hinged to the outside of the second link (3). One end of the first link (2) is hinged to the outside of the second swing arm (16). The third link (4) is hinged to the outside of the first swing arm (6). The other ends of the first link (2), the second link (3) and the third link (4) are hinged together. One end of the fifth link (25) is hinged to the outside of the fourth link (24), and one end of the fifth link (25) is fitted with the sliding ring (35) through a groove, so that the sliding ring (35) is stuck in the groove at one end of the fifth link (25). One end of the rack (23) is stuck to the outside of the sliding ring (35) through a groove, and rectangular grooves are engraved on both sides of the rack (23). The rack (23) is mounted on the front cover (21) through a sliding joint.

2. The device for a circular piston variable hydraulic pump according to claim 1, characterized in that: The main shaft (15) is mounted on the outside of the front cover (21) via a rotating joint, while the shaft end cover (31) is mounted on the outside of the front cover (21) via bolts (13), and the positions of the main shaft (15) and the shaft end cover (31) correspond to each other.

3. The device for a circular piston variable hydraulic pump according to claim 2, characterized in that: The second main shaft (34) is installed on the outside of the rear cover (17), while the first shaft end cover (18) is connected to the outside of the rear cover (17) by bolts (13), and the positions of the first shaft end cover (18) and the second shaft end cover (31) correspond to each other.

4. The device for a circular piston variable hydraulic pump according to claim 3, characterized in that: The stepper motor (32) is mounted on the front cover (21) by bolts (13), and the gear (33) is mounted on the output end of the stepper motor (32). The gear (33) and the rack (23) form a gear pair and mesh with each other.

5. The device for a circular piston variable hydraulic pump according to claim 4, characterized in that: The oil outlet ring (19) is installed on the outside of the rear cover (17) by bolts (13), and the oil groove inside the oil outlet ring (19) is aligned with the oil outlet hole (7) on the rear cover (17).

6. The device for a circular piston variable hydraulic pump according to claim 5, characterized in that: The oil inlet ring (22) is installed on the outside of the front cover (21) by bolts (13), and the oil groove inside the oil inlet ring (22) is aligned with the oil inlet hole on the front cover (21). The one-way valve (9) is installed on the outside of the oil inlet ring (22) and the oil outlet ring (19) respectively, and the oil outlet pipe (10) and the oil inlet pipe (20) are installed on the outside of the one-way valve (9).

7. The device for a circular piston variable hydraulic pump according to claim 6, characterized in that: The driving circuit of the stepper motor (32) mainly uses PMM8713 and SLA4061 chips. The speed of the stepper motor is determined by the input pulse frequency of the CK terminal of PMM8713. The forward and reverse rotation of the stepper motor can be switched by adding a signal 1 or 0 to the U / D terminal.

Images