Clutch mechanism for hydraulic pump

Abstract

The utility model discloses a clutch mechanism for a hydraulic pump. The clutch mechanism comprises an outer coupling, an inner coupling, a separating mechanism, a tripping mechanism and an electric switch, end face teeth are arranged at the other end of the outer coupling; an inner hole for mounting a ball bearing is formed in the outer coupling, and the outer coupling is arranged on the inner shaft through a small limiting shaft; the ball bearing is in interference connection with the limiting screw, and a locking nut is arranged on the side close to the pump cavity. The limiting small shaft is arranged in an inner hole of the inner coupling, and the limiting right end is connected with the limiting sleeve through external threads; the limiting sleeve is arranged in a screw sleeve on the inner shaft; the left end of the limiting screw is attached to the outer coupler step. The reliability of the overload protection function of the hydraulic pump is effectively improved, the use working condition of a hydraulic system is improved, and therefore the reliability, the safety and the service life of the hydraulic system, accessories of the hydraulic system and even the whole equipment are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of clutches for hydraulic pumps, in particular to a clutch mechanism for hydraulic pumps. Background Art

[0002] In traditional hydraulic pump design, the overload protection function of the hydraulic pump is mainly achieved by designing the minimum cross-section of the transmission shaft connected to the engine casing.

[0003] Theoretically, when the pump has a fault such as locking of the rotor and plunger, the transmission shaft is twisted off at the smallest cross-section under overload torque conditions, thereby achieving the goal of twisting off the connecting shaft without damaging the hydraulic pump body.

[0004] However, due to the complexity of hydraulic pump working conditions, the dispersion of materials, and differences in processing, it is difficult to achieve an appropriate minimum cross-sectional design size.

[0005] If the minimum cross-section is designed to be too small, the transmission may be broken when the hydraulic pump is working normally or slightly abnormally; if the minimum cross-section is designed to be too large, the transmission shaft cannot be broken in time when the hydraulic pump locks or other faults occur, which will endanger the safety of the engine. Utility Model Content

[0006] The purpose of the utility model is to provide a clutch mechanism for a hydraulic pump. The utility model is applied to the hydraulic pump and has the advantages of being more reliable, safer and having a longer service life.

[0007] The technical solution of the utility model is as follows: a clutch mechanism for a hydraulic pump, comprising an outer coupling, an inner coupling, a separation mechanism, a tripping mechanism and an electrical switch; one end of the outer coupling is provided with an outer spline for connecting to an engine, and the other end is provided with an end face tooth connected to the inner coupling; an inner hole for installing a ball bearing is provided on the outer coupling, and the outer coupling is arranged on the inner shaft of a pump body through a limiting small shaft; the ball bearing is interference-connected with a detachable limiting screw, and a locking nut is provided on the side of the ball bearing close to the pump chamber; a middle polished rod of the limiting small shaft is arranged in the inner hole of the inner coupling, and the right end of the limiting small shaft is connected to the limiting sleeve through an external thread; the limiting sleeve is arranged in a threaded sleeve located on the inner shaft; the left end of the limiting screw is fitted with the step of the outer coupling.

[0008] In the aforementioned clutch mechanism for the hydraulic pump, a spring and a sealing assembly are provided between the inner shaft and the limiting small shaft.

[0009] In the aforementioned clutch mechanism for the hydraulic pump, the left end of the inner shaft is connected to a positioning tube via a thread, and the limiting screw passes through the positioning tube for limiting.

[0010] In the aforementioned clutch mechanism for the hydraulic pump, a wave spring is provided between the positioning tube and the inner coupling, and a wave spring seat is provided on the left side of the wave spring; the inner coupling is provided with a slot, a retaining ring is provided in the slot, and the retaining ring is correspondingly abutted against the wave spring seat.

[0011] In the aforementioned clutch mechanism for a hydraulic pump, three pivots are evenly arranged on the positioning tube, and each pivot is provided with a lever; the side surface of one end of each lever is arc-shaped, the lever is limited in a limiting groove formed by a guard plate and a radial ring, and the end of the lever close to the inner coupling side is a boss.

[0012] In the aforementioned clutch mechanism for a hydraulic pump, the tripping mechanism can be rotatably arranged, and the tripping mechanism is provided with a needle roller groove corresponding to the needle roller of the electrical switch.

[0013] In the aforementioned tooth clutch for the hydraulic pump, the release mechanism is provided with a push rod and a pull ring provided on the push rod.

[0014] In the aforementioned tooth clutch for hydraulic pump, the separation mechanism is supported by the separation spring assemblies on both sides thereof, and each separation spring assembly includes: an upper spring seat, a separation spring, and a lower spring seat; when the pull ring on the push rod is pulled, or the electric switch is activated, the needle roller on the other side of the push rod is pushed out of the needle roller groove under the action of electromagnetic force, and the separation mechanism moves toward the outer coupling under the action of the separation spring, and then pushes the lever in the aforementioned radial ring limit groove to rotate, so that the boss plane on the other side of the lever abuts against the outer cylindrical step surface of the inner coupling, thereby pushing the inner coupling to move toward one side of the pump chamber, and finally separating the inner and outer couplings. On the contrary, the inner and outer couplings are meshed.

[0015] In the aforementioned dog clutch for a hydraulic pump, the outer coupling is provided with a minimum cross-section portion.

[0016] Compared with the prior art, the utility model designs a tooth clutch on the hydraulic pump transmission system, which can timely cut off or mesh the hydraulic pump with the engine or motor, thereby avoiding the characteristics of the prior art hydraulic pump that sets a minimum cross section on the transmission shaft and has poor overload protection.

[0017] The invention can be engaged and disengaged through an electrical switch or manually, is easy to operate, and has strong anti-electromagnetic interference capability.

[0018] The present application is arranged on the engine driven pump transmission system, and when the engine driven pump fails, the connection between the engine and the engine driven pump can be disconnected in time to protect the engine, that is, it has an overload protection function;

[0019] Secondly, when the drive pump fails, the clutch mechanism disconnection function can prevent the engine drive pump from further damage, so as to accurately analyze the cause and mechanism of the failure and provide accurate data for improving product design.

[0020] The utility model effectively improves the reliability of the overload protection function of the hydraulic pump and improves the use condition of the hydraulic system, thereby improving the reliability, safety and service life of the hydraulic system and its accessories and even the entire equipment.

[0021] The utility model is applied to the hydraulic pump and has the advantages of being more reliable, safer and having a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the utility model Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the utility model Figure 2 ;

[0024] Figure 3 yes Figure 2 Enlarged view of point C in the middle;

[0025] Figure 4 This is a schematic diagram of the structure of the utility model Figure 3 ;

[0026] Figure 5 This is the schematic diagram of a hydraulic pump with a clutch.

[0027] Markings in the accompanying drawings: 1-external coupling, 2-ball bearing, 3-internal coupling, 4-shift rod, 5-screw sleeve, 6-limit sleeve, 7-inner shaft, 8-spring, 9-sealing assembly, 10-positioning tube, 11-locking nut, 12-limiting small shaft, 13-retaining ring, 14-wave spring seat, 15-wave spring, 16-limiting screw, 17-electrical switch, 18-tripping mechanism, 19-pull ring, 20-push rod, 21-lower spring seat, 22-separation spring, 23-upper spring seat, 24-separation mechanism, 25-radial ring, 26-guard plate, 27-pivot, 28-bushing, 29-needle roller. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0029] Embodiment. A clutch mechanism for a hydraulic pump, such as Figure 1-5As shown, it includes an outer coupling 1, an inner coupling 3, a separation mechanism 24, a release mechanism 18 and an electrical switch 17; one end of the outer coupling 1 is provided with an external spline for connecting to the engine, and the other end is provided with an end face tooth connected to the inner coupling 3; the outer coupling 1 is provided with an inner hole for installing a ball bearing 2, and the outer coupling 1 is arranged on the inner shaft 7 of the pump body through a limiting small shaft 12; the ball bearing 2 is interference-connected with a detachable limiting screw 16, and a locking nut 11 is provided on the side of the ball bearing 2 close to the pump chamber to prevent the ball bearing 2 from axial movement; the middle light rod of the limiting small shaft 12 is arranged in the inner hole of the inner coupling 3 and is supported by two bushings 28; the right end of the limiting small shaft 12 is connected to the limiting sleeve 6 through an external thread; the limiting sleeve 6 is arranged in the screw sleeve 5 located on the inner shaft 7 and is limited so that the limiting small shaft 12 cannot be axially disengaged; the left end of the limiting screw 16 is stepped with the outer coupling 1.

[0030] The ball bearing 2 supports the external coupling 1 .

[0031] A spring 8 and a sealing assembly 9 are provided between the inner shaft 7 and the limiting small shaft 12 . The sealing assembly 9 can not only seal the lubricating oil from the engine drive pump, but also support the spring 8 .

[0032] The left end of the inner shaft 7 is connected to a positioning tube 10 via a thread, and the limiting screw 16 passes through the positioning tube 10 to limit the position and prevent the positioning tube 10 from falling off.

[0033] A wave spring 15 is provided between the positioning tube 10 and the inner coupling 3 , and a wave spring seat 14 is provided on the left side of the wave spring 15 ; the inner coupling 3 is provided with a slot, and a retaining ring 13 is provided in the slot, and the retaining ring 13 is correspondingly abutted against the wave spring seat 14 .

[0034] Three pivots 27 are evenly arranged on the positioning tube 10, and each pivot 27 is provided with a lever 4; the side surface of one end of each lever 4 is arc-shaped, and the lever 4 is limited in a limiting groove formed by a guard plate 26 and a radial ring 25, and the end of the lever 4 close to the inner coupling 3 is a boss.

[0035] When the separation mechanism 24 is working, the guard plate 26 pushes the arc-shaped end of the lever 4 to make the lever 4 rotate around the pivot 27. Since the end of the lever 4 on the side of the inner coupling 3 is a boss, when the lever 4 rotates to overcome the gap, the boss will contact the boss surface of the inner coupling 3, and then push the inner coupling 3 to overcome the force of the wave spring 15 and move toward the inner shaft 7, so that the end face teeth of the inner coupling 3 are disengaged from the end face teeth of the outer coupling 1.

[0036] The tripping mechanism 18 is rotatably disposed, and is provided with a needle roller groove corresponding to the needle roller 29 of the electrical switch 17 .

[0037] The separation mechanism 24 is provided with a push rod 20 and a pull ring 19 provided on the push rod 20 ; the push rod 20 is provided with a roller needle 29 .

[0038] The separation mechanism 24 is supported by the separation spring components on both sides thereof, each of which includes: an upper spring seat 23, a separation spring 22, and a lower spring seat 21; when the pull ring 19 on the push rod 20 is pulled, or the electric switch 17 is activated, the needle roller 29 on the other side of the push rod 20 is pushed out of the needle roller groove under the action of the electromagnetic force, and the separation mechanism 24 moves toward the outer coupling 1 under the action of the separation spring 22, and then pushes the lever 4 in the limit groove of the radial ring 25 to rotate, so that the boss plane on the other side of the lever 4 abuts against the outer cylindrical step surface of the inner coupling 3, thereby pushing the inner coupling 3 to move toward one side of the pump chamber, and finally separating the inner coupling 3 and the outer coupling 1. On the contrary, the inner coupling 3 and the outer coupling 1 are meshed.

[0039] The outer coupling 1 is provided with a minimum cross-section portion to prevent the clutch from being unable to disengage in time and to play a secondary overload protection function in situations where overload protection is required.

[0040] Working principle:

[0041] The present application controls the fitting and separation between the end face gear pair formed by the end face teeth of the inner coupling 3 and the outer coupling 1 at the end of the shaft through precise mechanical transmission, thereby realizing the function of connecting and disconnecting the internal part of the engine-driven pump;

[0042] When the inner coupling 3 "extends outwards", the end face teeth on the inner coupling 3 and the outer coupling 1 are meshed, and when the inner coupling 3 "retracts inwards", they are separated;

[0043] The outer coupling 1 is limited on the inner shaft 7 of the product by the limiting small shaft 12, and a bearing is arranged inside the outer coupling 1. When separated (mechanical clutch is separated), the outer coupling 1 can be idle without driving the inner shaft 7 to rotate; when fitted (mechanical clutch is connected), the mechanical energy can be transmitted to the inner shaft 7 through the meshing of the end face teeth on the outer coupling 1, driving the product rotor to rotate and converting the mechanical energy into hydraulic energy.

[0044] Meshing process:

[0045] When the engine drives the pump to work normally, the inner coupling 3 and the outer coupling 1 are in meshing state; the clutch is meshed by manually rotating the tripping mechanism 18 from the side so that the needle roller 29 of the electrical switch 17 acts on the needle roller groove of the tripping mechanism 18. The tripping mechanism 18 is installed on the hydraulic pump body, and the tripping mechanism 18 can rotate relative to the mounting hole of the pump body;

[0046] The arc surface of the bearing on the tripping mechanism 18 makes relative planar motion on the inclined surface of the separation mechanism 24, driving the separation mechanism 24 to make circular motion, and squeezing the radial ring 25 through the separation mechanism 24. The radial ring 25 is forced to force the lever 4 to rotate around the cylindrical pin. One side of the lever 4 is restricted in the groove of the radial ring 25 by the guard plate 26, and the other side is installed on the groove of the positioning tube 10 through the pivot 27. The arc segment of the lever 4 acts on the conical surface of the inner coupling 3, causing the inner coupling 3 to make axial motion toward the tail section of the shaft, and the inner coupling 3 "extends outward", realizing the process of meshing of the inner coupling 3 and the outer coupling 1.

[0047] Separation process:

[0048] The clutch is disengaged by manually pulling the pull ring 19 (or by the electrical switch 17), thereby pulling out the push rod 20, and then separating the push rod 20 from the separation mechanism 24, so that the needle roller on the push rod 20 is separated from the needle roller groove of the release mechanism 18;

[0049] The separation mechanism 24 is acted upon by the elastic force of the spring 8, squeezing the positioning tube 10 to make it move axially toward the shaft tail section, and the lever 4 rotates around the pivot 27, and its arc surface is separated from the conical surface of the inner coupling 3, directly acting on the step surface of the inner coupling 3 and exerting a certain pressure;

[0050] The inner coupling 3 is acted upon by the elastic force of the wave spring 15 at the shaft tail, forcing the inner coupling 3 to "shrink inward", thereby realizing the process of separating the inner coupling 3 and the outer coupling 1.

Claims

1. A clutch mechanism for a hydraulic pump, characterized in that: The invention comprises an outer coupling (1), an inner coupling (3), a separation mechanism (24), a release mechanism (18) and an electrical switch (17); one end of the outer coupling (1) is provided with an outer spline for connecting to an engine, and the other end is provided with an end face tooth connected to the inner coupling (3); an inner hole for installing a ball bearing (2) is provided on the outer coupling (1), and the outer coupling (1) is arranged on the inner shaft (7) of the pump body through a limit shaft (12); The ball bearing (2) is interference-connected with a detachable limit screw (16); a locking nut (11) is provided on the side of the ball bearing (2) close to the pump chamber; the middle rod of the limit small shaft (12) is arranged in the inner hole of the inner coupling (3); the right end of the limit small shaft (12) is connected to the limit sleeve (6) through an external thread; the limit sleeve (6) is arranged in a threaded sleeve (5) located on the inner shaft (7); the left end of the limit screw (16) is stepped with the outer coupling (1).

2. A clutch mechanism for a hydraulic pump according to claim 1, characterized in that: A spring (8) and a sealing assembly (9) are provided between the inner shaft (7) and the limiting small shaft (12).

3. A clutch mechanism for a hydraulic pump according to claim 1, characterized in that: The left end of the inner shaft (7) is connected to a positioning tube (10) via a thread, and the limiting screw (16) passes through the positioning tube (10) for limiting.

4. A clutch mechanism for a hydraulic pump according to claim 3, characterized in that: A wave spring (15) is provided between the positioning tube (10) and the inner coupling (3), and a wave spring seat (14) is provided on the left side of the wave spring (15); a slot is provided on the outer circle of the left end of the inner coupling (3), and a retaining ring (13) is provided in the slot, and the retaining ring (13) is in corresponding contact with the wave spring seat (14).

5. The clutch mechanism for a hydraulic pump according to claim 3, characterized in that: The positioning tube (10) is evenly provided with three pivots (27), and each of the pivots (27) is provided with a lever (4); the side surface of one end of each lever (4) is arc-shaped, the lever (4) is limited in a limiting groove formed by a guard plate (26) and a radial ring (25), and one end of the lever (4) close to the inner coupling (3) is a boss.

6. A clutch mechanism for a hydraulic pump according to claim 1, characterized in that: The tripping mechanism (18) is rotatably arranged, and the tripping mechanism (18) is provided with a rolling needle groove corresponding to the rolling needle (29) of the electrical switch (17).

7. A clutch mechanism for a hydraulic pump according to claim 1, characterized in that: The separation mechanism (24) is provided with a push rod (20) and a pull ring (19) provided on the push rod (20).

8. The clutch mechanism for a hydraulic pump according to claim 1, characterized in that: The outer coupling (1) is provided with a minimum cross-section portion.

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