Device for split type high-pressure gear pump

Abstract

The utility model relates to a device for a split type high-pressure gear pump, which is characterized in that an oil seal seat is fixed on a front cover through a screw, a bearing is arranged in the front cover, the bearing is axially fixed through the oil seal seat, a connecting shaft penetrates through the oil seal seat, one end of the connecting shaft is matched with a driving gear shaft through a spline, and the other end of the connecting shaft is matched with a transmission shaft. The outer circle of one end of the connecting shaft and the inner ring of the bearing are fixed together, an oil seal is arranged between the connecting shaft and the oil seal seat, and an O-shaped ring is arranged between the oil seal seat and the front cover. According to the utility model, the coaxial precision of the oil seal seat and the bearing can be ensured, the radial swing quantity of the oil seal mounted in the oil seal seat mounting hole relative to the connecting shaft can be greatly reduced, and the service life of the oil seal is prolonged; the oil seal seat is fixed in the mounting threaded hole of the front cover through a screw, and the axial displacement of the oil seal seat is small; the transmission matching precision of the oil seal and the transmission shaft in the working process can be ensured, the coaxiality of the connecting shaft and the driving gear shaft is ensured, the axial load and the radial load from the outside are borne, and the service life of the product is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pumps, in particular to a device for a split-type high-pressure gear pump. Background Art

[0002] like Figure 1 The structure of an existing split gear pump generally includes a connecting shaft, an oil seal seat, an oil seal, a hole retaining ring, an O-ring, a bearing, a shaft retaining ring, a driving gear shaft, and a front cover. The oil seal seat is pressed against the bearing through the hole retaining ring to ensure the coaxiality of the connecting shaft and the driving gear shaft, thereby offsetting the axial force and radial force from the outside. However, since the standard hole retaining ring has a certain elasticity and a large thickness tolerance, there will be a certain gap in actual work, and the transmission accuracy is low, resulting in large vibration and noise, and the oil seal is prone to fatigue. The life of the entire transmission system is reduced, especially the oil seal is prone to fatigue, thereby reducing the service life of the pump.

[0003] To this end, the present application designs a device for a split-type high-pressure gear pump to solve the above-mentioned problems. Summary of the invention

[0004] In order to make up for the shortcomings of the prior art that the oil seal seat is fixed with a retaining spring, there is a gap, the transmission accuracy is low, the vibration and noise are large, the gear gap is large and easy to deform, the life of the entire transmission system is reduced, and thus the service life of the pump is reduced, the utility model provides a device for a split high-pressure gear pump.

[0005] A device for a split high-pressure gear pump, comprising an oil seal seat and a front cover, characterized in that:

[0006] The oil seal seat is fixed on the front cover by screws, a bearing is installed in the front cover, the bearing is axially fixed by the oil seal seat, a connecting shaft passes through the oil seal seat, one end of the connecting shaft is matched with the driving gear shaft through a spline, the outer circle of one end of the connecting shaft is fixed with the inner ring of the bearing, an oil seal is installed between the connecting shaft and the oil seal seat, and an O-ring is arranged between the oil seal seat and the front cover.

[0007] Furthermore, in order to better realize the utility model, the bearing is fixed in the bearing hole of the front cover, one end of the small end face of the oil seal seat is pressed on the bearing end face, the bearing is pressed onto the end face of the bearing hole of the front cover, and the positioning end face of the oil seal seat is fixed on the positioning end face of the front cover.

[0008] Furthermore, in order to better realize the utility model, the positioning stop of the oil seal seat and the bearing hole of the front cover are arranged concentrically to ensure the coaxial transmission accuracy of the oil seal seat, the connecting shaft and the driving gear shaft.

[0009] Furthermore, in order to better implement the present invention, an oil seal mounting hole is provided on the oil seal seat, and an oil seal is installed between the oil seal mounting hole and the connecting shaft to seal the hydraulic oil leaking from the shaft end.

[0010] Furthermore, in order to better implement the present invention, the O-ring is used to seal the hydraulic oil leaking from the gap between the stop of the oil seal seat and the bearing hole of the front cover.

[0011] Furthermore, in order to better realize the utility model, one side of the oil seal is fixed to the oil seal rib of the oil seal seat, and the other side is fixed to the hole assembled in the retaining ring mounting hole with a retaining ring to ensure that the oil seal is fixed in the oil seal mounting hole.

[0012] Furthermore, in order to better realize the utility model, the outer circle of the stopper of the oil seal seat is installed with a clearance fit with the bearing hole of the front cover, and is installed in the same hole as the bearing. On the one hand, the coaxial accuracy of the oil seal seat and the bearing is ensured, and on the other hand, the radial swing amount of the oil seal installed in the mounting hole of the oil seal seat relative to the connecting shaft is reduced, thereby improving the service life of the oil seal.

[0013] Furthermore, in order to better implement the present invention, the oil seal seat is fixed in the mounting threaded hole of the front cover by screws.

[0014] Furthermore, in order to better realize the utility model, a disassembly threaded hole is provided on the oil seal seat. After the mounting screws are loosened and removed, the oil seal seat together with the oil seal can be removed using two screws, and the wearing oil seal can be replaced, which is convenient for maintenance.

[0015] The beneficial effects of the utility model are:

[0016] The oil seal seat, bearing and transmission shaft of the utility model are installed in the same hole of the front cover, which can ensure the coaxial accuracy of the oil seal seat and the bearing on the one hand, and greatly reduce the radial swing amount of the oil seal installed in the installation hole of the oil seal seat relative to the connecting shaft on the other hand, thereby improving the service life of the oil seal; the oil seal seat is fixed in the installation threaded hole of the front cover by screws, and the axial movement amount of the oil seal seat is small; the transmission matching accuracy of the oil seal and the transmission shaft during the working process can be ensured, and the coaxiality of the connecting shaft and the driving gear shaft can be ensured, and the axial load and radial load from the outside can be endured to improve the service life of the product; a disassembly threaded hole is provided on the oil seal seat, which is convenient for disassembling the oil seal seat together with the oil seal, replacing the wearing oil seal, and convenient maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an existing split gear pump structure;

[0018] Figure 2 It is a structural schematic diagram of the utility model;

[0019] Figure 3This is a schematic diagram of the structure of the oil seal seat of the utility model;

[0020] Figure 4 It is a schematic diagram of the front cover structure of the utility model.

[0021] In the figure,

[0022] 1: connecting shaft, 2: screw, 3: oil seal seat, 4: oil seal, 5: front cover, 6: O-ring, 7: retaining ring for hole, 8: bearing, 9: driving gear shaft, 3-1: oil seal mounting hole, 3-2: oil seal rib, 3-3: fixing hole, 3-4: stopper, 3-5: O-groove, 3-6: retaining ring mounting hole, 3-7: positioning end face, 3-8: small end face, 3-9: disassembly threaded hole, 5-1: positioning end face, 5-2: mounting threaded hole, 5-3: bearing hole, 5-4: bearing hole end face. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0025] Figure 2-Figure 4It is a specific embodiment of the utility model, which is a device for a split high-pressure gear pump. The oil seal seat 3 is fixed on the front cover 5 by screws 2, and the bearing 8 is installed in the bearing hole 5-3 of the front cover 5 and is axially fixed by the oil seal seat 3. One end of the small end face 3-8 of the oil seal seat 3 is pressed on the bearing end face, and the bearing 8 is pressed on the end face 5-4 of the bearing hole of the front cover 5, and one end is fixed on the positioning end face 5-1 of the front cover 5. One end of the connecting shaft 1 extends out of the oil seal seat 3, and the other end is matched with the driving gear shaft 9 through a spline. The outer circle of one end of the connecting shaft 1 is fixed with the inner ring of the bearing 8 to ensure that the transmission shaft is fixed in the specified position. The positioning stop 3-4 of the oil seal seat 3 is arranged concentrically with the bearing hole 5-3 of the front cover 5 to ensure the coaxial transmission accuracy of the oil seal seat 3, the connecting shaft 1 and the driving gear shaft 9. An oil seal 4 is installed between the connecting shaft 1 and the oil seal mounting hole 3-1 of the oil seal seat 3, which is used to seal the hydraulic oil leaked from the shaft end. An O-ring 6 is arranged between the oil seal seat 3 and the front cover 5, which is used to seal the hydraulic oil leaked from the gap between the stop 3-4 of the oil seal seat 3 and the bearing hole 5-3 of the front cover 5; the oil seal seat 3 is characterized by comprising an oil seal mounting hole 3-1, an oil seal retaining edge 3-2, a retaining ring mounting hole 3-6, a stop 3-4, an O-shaped groove 3-5, a fixing hole 3-3, a disassembly threaded hole 3-9, a positioning end face 3-7, and a small end face 3-8; the front cover 5 is characterized by comprising a positioning end face 5-1, a mounting threaded hole 5-2, a bearing hole 5-3, and a bearing hole end face 5-4. The above structure can conveniently realize the following functions: the connecting shaft 1 smoothly transmits the torque of the prime mover to the driving gear shaft 9 of the oil pump through the device, and converts the rotational mechanical energy into hydraulic energy. The axial force and radial force from the outside are transmitted to the bearing 8 through the connecting shaft 1 and are borne by the bearing 8, thereby ensuring the high precision of the hydraulic pump during operation, transmitting torque, achieving smooth operation, no noise, high transmission efficiency, reliable operation, long service life, and simple installation and disassembly of the oil seal seat.

[0026] The specific implementation of this embodiment is as follows:

[0027] The oil seal 4 is installed in the oil seal mounting hole 3-1 of the oil seal seat 3, one side of which is fixed to the oil seal rib 3-2, and the other side is fixed to the hole assembled in the retaining ring mounting hole 3-6 by a retaining ring 7, which is used to ensure that the oil seal 4 is fixed in the oil seal hole. The advantage is that by limiting the position of the oil seal, it can be ensured that the oil seal will not interfere with the surrounding components due to external forces; the outer circle of the stop 3-4 of the oil seal seat 3 is installed with a clearance fit with the bearing hole of the front cover 5, and is installed in the same hole with the bearing 8. On the one hand, it can ensure the coaxial accuracy of the oil seal seat and the bearing, and on the other hand, it can greatly reduce the relative The radial swing of the connecting shaft 1 increases the service life of the oil seal 4; the oil seal seat 3 is fixed in the mounting threaded hole 5-2 of the front cover 5 by screws 2, and the small end face 3-8 of the oil seal seat 3 contacts and cooperates with the bearing end face, and the positioning end face 3-7 of the oil seal seat 3 cooperates with the front cover 5. The axial movement of the oil seal seat can be easily controlled by controlling the height tolerance of the stop 3-4 of the oil seal seat 3 and the depth tolerance of the bearing hole of the front cover 5, ensuring the transmission matching accuracy of the oil seal 4 and the transmission shaft 1 during the working process, ensuring the coaxiality of the connecting shaft 1 and the driving gear shaft 10, and bearing the axial load and radial load from the outside to increase the service life. The oil seal seat 3 is provided with a disassembly threaded hole 3-9. After loosening and disassembling the mounting screws 2, two screws are used to facilitate the disassembly of the oil seal seat 3 together with the oil seal 4, and the wearing part oil seal 4 is replaced, which is convenient for maintenance.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A device for a split high-pressure gear pump, comprising an oil seal seat (3) and a front cover (5), characterized in that: The oil seal seat (3) is fixed to the front cover (5) by means of screws (2); a bearing (8) is installed in the front cover (5); the bearing (8) is axially fixed by the oil seal seat (3); a connecting shaft (1) passes through the oil seal seat (3); one end of the connecting shaft (1) is engaged with a driving gear shaft (9) by means of a spline; an outer circle of one end of the connecting shaft (1) is fixed with an inner ring of the bearing (8); an oil seal (4) is installed between the connecting shaft (1) and the oil seal seat (3); and an O-ring (6) is provided between the oil seal seat (3) and the front cover (5).

2. The device for a split high-pressure gear pump according to claim 1, characterized in that: The bearing (8) is fixed in the bearing hole (5-3) of the front cover (5), one end of the small end face (3-8) of the oil seal seat (3) is pressed onto the bearing end face, the bearing (8) is press-fitted onto the bearing hole end face (5-4) of the front cover (5), and the positioning end face (3-7) of the oil seal seat (3) is fixed onto the positioning end face (5-1) of the front cover (5).

3. The device for a split high-pressure gear pump according to claim 1, characterized in that: The positioning stop (3-4) of the oil seal seat (3) and the bearing hole (5-3) of the front cover (5) are arranged in a concentric structure, so as to ensure the coaxial transmission accuracy of the oil seal seat (3), the connecting shaft (1) and the driving gear shaft (9).

4. The device for a split high-pressure gear pump according to claim 1, characterized in that: The oil seal seat (3) is provided with an oil seal mounting hole (3-1), and an oil seal (4) is installed between the oil seal mounting hole (3-1) and the connecting shaft (1) for sealing hydraulic oil leaking from the shaft end.

5. The device for a split high-pressure gear pump according to claim 1, characterized in that: The O-ring (6) is used to seal the hydraulic oil leaking from the gap between the stopper (3-4) of the oil seal seat (3) and the bearing hole (5-3) of the front cover (5).

6. The device for a split high-pressure gear pump according to claim 4, characterized in that: One side of the oil seal (4) is fixed to the oil seal rib (3-2) of the oil seal seat (3), and the other side is fixed to a hole assembled in the retaining ring mounting hole (3-6) by a retaining ring (7), so as to ensure that the oil seal (4) is fixed in the oil seal mounting hole (3-1).

7. The device for a split high-pressure gear pump according to claim 5, characterized in that: The outer circle of the stopper (3-4) of the oil seal seat (3) is installed with a clearance fit to the bearing hole (5-3) of the front cover (5), and is installed in the same hole as the bearing (8). On the one hand, the coaxial accuracy of the oil seal seat (3) and the bearing (8) is ensured, and on the other hand, the radial swing amount of the oil seal (4) installed in the installation hole (3-1) of the oil seal seat (3) relative to the connecting shaft (1) is reduced, thereby increasing the service life of the oil seal (4).

8. The device for a split high-pressure gear pump according to claim 1, characterized in that: The oil seal seat (3) is fixed in the mounting threaded hole (5-2) of the front cover (5) by means of screws (2).

9. The device for a split high-pressure gear pump according to claim 1, characterized in that: The oil seal seat (3) is provided with a disassembly threaded hole (3-9). After the mounting screws (2) are loosened and removed, the oil seal seat (3) together with the oil seal (4) can be removed using two screws to replace the wearing oil seal (4), thereby facilitating maintenance.

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