CN115163483A - A hydraulic gear pump - Google Patents

Abstract

The invention discloses a hydraulic gear pump, comprising a driving gear shaft, a lip seal, a front end cover, a front "8" type sleeve, a pump body, a rear "8" type sleeve, a rear end cover, a driven gear shaft, a positioning Pin hole, pump outlet, fixing bolt hole. Compared with the prior art, the beneficial effects are: dynamic compensation of the radial force of the bearing, forming an oil film between the rotating shafts, solving the wear between the bearing and the shaft when rotating, and realizing the dynamic pressure floating state of the rotating shaft; The axial force generated when the medium is rotated and meshed is compensated to solve the axial movement of the gear due to the axial force; the inclination due to the high and low pressure difference between the contact end faces of the gear is effectively relieved; an opening from high pressure to medium pressure to low pressure is formed. Ring, introduce dynamic high pressure oil, maintain constant dynamic pressure, take away high temperature oil to reduce the internal temperature of the hydraulic gear pump, and play the role of lubrication and cooling.

Description

A hydraulic gear pump

technical field

The invention relates to the technical field of hydraulic gear pumps, in particular to a hydraulic gear pump.

Background technique

Hydraulic gear pumps are widely used in high-end engineering fields such as national defense, naval power, aerospace, mobile machinery, medical equipment, and heavy equipment. As one of the core components of hydraulic systems, their performance directly determines the hydraulic system. The quality of the equipment affects the performance of high-end engineering equipment. The leakage of the gear pump will affect the volumetric efficiency of the gear pump, and the wear of the gear pump will directly or indirectly reduce the volumetric efficiency, working life, and noise of the pump. The generated noise not only affects the performance of the entire system, but also has certain adverse effects on people's physical and mental health. Therefore, the low leakage, low noise and low wear of the hydraulic gear pump play a vital role in the safety and stability of the entire hydraulic system. Therefore, in the design stage of hydraulic gear pump, it is necessary to understand the mechanism of leakage, noise and wear, prevent leakage, wear and noise, and then improve the performance of hydraulic gear pump. Radial force, axial force and high and low pressure areas that occur in the hydraulic gear pump in the work project are all causes of wear and noise of the pump; the shaft and bearing sleeve are seriously worn under the condition of long-term work, and heat is generated by rotation at the same time High-speed working conditions cannot be achieved due to noise and noise; the heat generated inside the pump cannot be eliminated in time, which changes the viscosity of the medium, reduces the performance of the pump and increases leakage. If the above problems can be solved together, and the problems of leakage, wear and noise can be effectively solved at the same time, at present, the main research at home and abroad is to improve the performance of hydraulic gear pumps at one point, but the improvement effect is low, and the performance of other problems can be improved. It is not obvious, and it is impossible to efficiently reduce the leakage, wear and noise of the gear pump and improve its life.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a hydraulic gear pump to solve the above-mentioned problems in the background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: including a driving gear shaft, a lip seal, a front end cover, a front "8" type sleeve, a pump body, a rear "8" type sleeve, a rear end cover, and a driven gear shaft. , locating pin hole, pump outlet, fixing bolt hole; the front end cover and the rear end cover and the pump body are provided with an "8" type through groove through the contact side, and a sealing O-ring is installed in the through groove; the front end cover is installed On the left side of the pump body; the front "8" type sleeve is installed on the left side of the pump body; the driving gear shaft is installed inside the pump body through the front end cover and the front "8" type sleeve, and the left side of the gear section is Contact with the right side of the front "8" type sleeve; the rear "8" type sleeve is in contact with the right side of the gear section of the driving gear shaft, and is located on the right side inside the pump body; the driven gear shaft penetrates the front "8" type sleeve And the rear "8" type sleeve is installed inside the pump body, and its gear segment meshes with the gear segment of the driving gear shaft; the rear end cover is installed on the right side of the pump body; the lip seal passes through the left side of the driving gear shaft The shaft section is installed on the left side of the front end cover; the pump outlet is installed in the center of the upper and lower sides of the pump body; the positioning pin holes are located at the connection between the front end cover and the rear end cover and the pump body respectively; the fixing bolt holes penetrate through the front end cover and the pump body. body, rear end cover and fix with nuts.

As a preferred technical solution of the present invention, the front contact surface of the front "8" type sleeve is the contact surface with the gear segment, and the rear contact surface is the contact surface with the pump body; a through hole is opened on the front "8" type sleeve and a blind hole, the drive gear shaft is installed in the through hole, and the driven gear shaft is installed in the blind hole; there are two positioning holes I, positioning holes II and a sealing groove on the rear contact surface; the upper side of the front "8" type sleeve The arc surface is provided with a drainage arc groove I and a drainage arc groove II, and the plane opening II between the arc surfaces is connected to the positioning hole II; the lower arc surface of the front "8" type sleeve is opened There is a hole I, which is connected with the through hole and the blind hole respectively; an arc groove I is opened beside the through hole on the front contact surface, and an inner hole is opened to communicate with the drainage arc groove II; the blind hole is opened on the front contact surface. The arc groove II is connected with the drainage arc groove I through the internal opening; the arc groove III is opened on the inner wall of the blind hole near the front contact surface, and the internal opening is communicated with the drainage arc groove II; A circular arc groove IV is opened on the inner wall of the hole near the front contact surface, and the inner opening is communicated with the drainage circular arc groove I.

As a preferred technical solution of the present invention, the angle of the arc groove I is 40°, the angle of the arc groove II is 80°, and the outer diameters of the two arc grooves are smaller than the gear segments of the driving gear shaft and the driven gear shaft. The tooth root circle radius; the angle of the arc groove III is 60°, and the angle of the arc groove IV is 90°.

As a preferred technical solution of the present invention, the difference between the rear "8" type sleeve and the front "8" type sleeve is that a sealing groove II is opened in the center of the sealing groove I on the rear contact surface, and the sealing groove II is a gourd-shaped groove, Both holes are blind holes, the angle of arc groove I is 80°, the angle of arc groove II is 40°, the angle of arc groove III is 90°, and the angle of arc groove IV is 60°.

As a preferred technical solution of the present invention, the front "8" type sleeve and the rear "8" type sleeve are respectively installed on the left and right sides of the driving gear shaft and the driven gear shaft, and the front "8" type sleeve and the rear "8" type sleeve are respectively installed on the left and right sides of the driving gear shaft and the driven gear shaft. The 8" type sleeve is installed symmetrically on the left and right sides.

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

1. Carry out dynamic compensation of bearing radial force, form oil film between rotating shafts, avoid eccentricity of two meshing shafts, solve wear between bearings and shafts when rotating, and realize dynamic pressure floating state of rotating shaft;

2. Compensate for the axial force generated when the helical gear rotates and meshes the conveying medium, so as to solve the axial movement of the gear due to the axial force;

3. Effectively alleviate the inclination caused by the high and low pressure difference of the contact end face of the gear;

4. An open loop is formed from high pressure to medium pressure to low pressure, dynamic high pressure oil is introduced to maintain a constant dynamic pressure, and the high temperature oil is taken away to reduce the internal temperature of the hydraulic gear pump, which plays the role of lubrication and cooling. Solving the above problems can effectively reduce the leakage, wear and noise of the hydraulic gear pump, thereby improving the overall performance of the hydraulic gear pump and prolonging the working life.

Description of drawings

Fig. 1 is the three-dimensional schematic diagram of the present invention;

Fig. 2 is a sectional view of the present invention;

Fig. 3 is the three-dimensional schematic diagram 1 of " 8 " type cover before the present invention;

Fig. 4 is the stereo schematic diagram II of the former "8" type sleeve of the present invention;

Fig. 5 is the three-dimensional schematic diagram III of the former "8" type sleeve of the present invention;

Fig. 6 is after " 8 " type cover three-dimensional schematic diagram 1 of the present invention;

In the figure: driving gear shaft 1, lip seal 2, front cover 3, front "8" type sleeve 4, positioning hole I401, positioning hole II402, sealing groove I403, hole I404, hole II405, drainage arc groove I406, Drainage arc groove II407, arc groove I408, arc groove II409, arc groove III410, arc groove IV411, pump body 5, rear "8" type sleeve 6, sealing groove II601 rear end cover 7, driven gear shaft 8. Positioning pin hole 9, pump outlet 10, fixing bolt hole 11.

Detailed ways

Example 1

As shown in Figures 1 to 6, the present invention discloses a hydraulic gear pump, comprising a driving gear shaft 1, a lip seal 2, a front end cover 3, a front "8" type sleeve 4, a pump body 5, a rear "8" ” type sleeve 6, rear end cover 7, driven gear shaft 8, positioning pin hole 9, pump outlet 10, fixing bolt hole 11; The "8" type through groove is installed with a sealing O-ring; the front end cover 3 is installed on the left side of the pump body 5; the front "8" type sleeve 4 is installed on the left side of the pump body 5; the active The gear shaft 1 is installed inside the pump body 1 through the front end cover 3 and the front "8" type sleeve 4, and the left side of the gear segment is in contact with the right side of the front "8" type sleeve 4; the rear "8" type sleeve 4 6 is in contact with the right side of the gear segment of the driving gear shaft 1 and is located on the right side of the pump body 5; the driven gear shaft 8 is installed inside the pump body 5 through the front "8" type sleeve 4 and the rear "8" type sleeve 6, Its gear segment meshes with the gear segment of the driving gear shaft 1; the rear end cover 7 is installed on the right side of the pump body 5; the lip seal 2 passes through the left shaft segment of the driving gear shaft 1 and is installed on the left side of the front end cover 3. The pump outlet 10 is installed in the center of the upper and lower sides of the pump body 5; the positioning pin holes 9 are located at the connection between the front end cover 3 and the rear end cover 7 and the pump body 5 respectively; the fixing bolt holes 11 penetrate through the front end cover 3, The pump body and the rear end cover 7 are fixed with nuts. The front contact surface of the front "8" type sleeve 4 is the contact surface with the gear segment, and the rear contact surface is the contact surface with the pump body 5; the front "8" type sleeve 4 is provided with a through hole and a blind hole, and the through hole The driving gear shaft 1 is installed inside, and the driven gear shaft 8 is installed in the blind hole; there are two positioning holes I401, positioning holes II402 and one sealing groove I403 on the rear contact surface; the upper arc surface of the front "8" type sleeve 4 There are drainage arc groove I406 and drainage arc groove II407, and the plane opening II405 between the arc surfaces is connected with the positioning hole II402; the lower arc surface of the front "8" type sleeve 4 has one hole on each side. The hole I404 is connected with the through hole and the blind hole respectively; the arc slot I408 is opened beside the through hole on the front contact surface, and the inner hole is connected with the drainage arc slot II407; the arc slot is opened beside the blind hole on the front contact surface Slot II409, and the inner opening is communicated with the drainage arc groove I406; an arc slot III410 is opened on the inner wall of the blind hole near the front contact surface, and the inner opening is communicated with the drainage arc slot II407; the inner wall of the through hole A circular arc groove IV411 is opened on the upper surface close to the front contact surface, and an inner hole is opened to communicate with the drainage circular arc groove I406. The difference between the rear "8" type sleeve 6 and the front "8" type sleeve 4 is that there is a sealing groove II601 in the center of the sealing groove I403 on the rear contact surface, and the sealing groove II601 is a gourd-shaped groove. The front "8" type sleeve 4 and the rear "8" type sleeve 6 are respectively installed on the left and right sides of the driving gear shaft 1 and the driven gear shaft 8, the front "8" type sleeve 4 and the rear "8" type sleeve 6 Symmetrical installation. Two sets of symmetrically installed front and rear "8"-type sleeves replace ordinary bearings to support and fix the driving gear shaft and the driven gear shaft, and make the liquid in the high-pressure area enter the inner arc of the "8"-type sleeve from the side grooves and small holes A high-pressure oil film is formed between the groove and the gear shaft, which not only increases lubrication, compensates for radial force, and reduces wear on the gear shaft. The angle of the arc groove I408 is 40°, the angle of the arc groove II409 is 80°, and the outer diameters of the two arc grooves are smaller than the root circle radius of the gear segments of the driving gear shaft 1 and the driven gear shaft 8; the The angle of the arc groove III410 is 60°, and the angle of the arc groove IV411 is 90°. An open loop is formed from high pressure to medium pressure to low pressure, dynamic high pressure oil is introduced to maintain a constant dynamic pressure, and the high temperature oil is taken away to reduce the internal temperature of the hydraulic gear pump, which plays the role of lubrication and cooling. Solving the above problems can effectively reduce the leakage, wear and noise of the hydraulic gear pump, thereby improving the overall performance of the hydraulic gear pump and prolonging the working life.

The working principle of the present invention is as follows: when the present invention is installed, the gear segments of the driving gear shaft 1 and the driven gear shaft 8 are meshed and installed in the pump body 5, and the front "8" type sleeve 4 and the rear "8" type sleeve are installed. 6 is installed on both sides of the gear section and installed in the pump body 5, then install the front end cover 3 and the rear end cover 7 on the left and right sides of the pump body 5 in turn, and use bolts to seal the pump body. The lip seal 2 is installed at the outlet of the gear shaft 1 to complete the sealing of the driving gear shaft and complete the installation of the gear pump.

In the front "8" type sleeve of the present invention, the high pressure oil on the rear contact end face is introduced into the outlet high pressure oil through the hole II405 and enters the positioning hole II402, and then reaches the rear contact surface through the positioning hole II402 to form a high pressure oil film. The high-pressure oil is introduced through the drainage arc groove II407, and communicates with the arc groove III410 on the inner surface of the corresponding hole and the arc groove I408 on the front contact surface, providing high-pressure oil, and finally enters the oil inlet through the hole I404. The high-pressure oil is introduced through the drainage arc groove I406, and communicates with the arc groove IV411 on the inner surface of the corresponding hole and the arc groove II409 on the front contact surface, providing high-pressure oil, and finally enters the oil inlet through the hole I404.

The introduction of high-pressure oil from the arc groove on the front contact surface of the "8" type sleeve can not only offset a part of the axial force, but also make the gear shaft float axially to reduce wear; The size of the oil contact area can solve the axial force generated by different gear shafts; the outer seal of the rear contact surface of the front and rear "8" type sleeves effectively isolates oil in different pressure ranges and reduces leakage; the inner sealing groove of the rear contact surface of the rear "8" type sleeve Prevent the leakage of high-pressure oil and at the same time make the rear contact surfaces of the two blind holes produce high-pressure oil contact surfaces of different sizes. The rear contact surface area corresponding to the rear "8" type sleeve of the driving gear shaft 1 is larger than that of the driven gear shaft 8 corresponding to the rear "8" type sleeve. The rear contact surface area, in order to compensate the axial force on the drive gear shaft 1; the dynamic pressure suspension is formed from the holes and grooves on the "8" type sleeve, which effectively solves the problem of balance between the radial force and the axial force of the gear shaft. Reduce the wear on the "8" type sleeve, reduce the overall noise of the hydraulic gear pump, adapt to higher rotational speeds, and improve the overall life of the gear pump.

The rear face of the front "8" type sleeve 4 mainly introduces high pressure oil to compensate the axial force. The axial force of the driving gear shaft 1 and the driven gear shaft 8 is just opposite, because the driving gear shaft and the front "8" type sleeve through hole are matched , If the axial force points to the front "8" type sleeve, the axial force is not easy to compensate, the present invention determines the rotation direction of the driving gear shaft 1, so that the axial force received by the driven gear shaft 8 points to the front "8" type Sleeve, the driving gear shaft 1 is subjected to the rearward "8" type sleeve. In order to effectively compensate the axial force, the rear end face introduces high pressure oil through hole II405 and positioning hole II402, and the contact surface area behind the blind hole is larger than that of the through hole. The high pressure area formed can compensate the axial force on the driven gear shaft 8; when compensating for the axial force, in order to avoid the contact wear between the front contact surface of the front "8" type sleeve and the end surface of the gear shaft, the arc on the front contact surface The groove I408 and the arc groove II409 are respectively connected with the side drainage arc groove I406 and the drainage arc groove II407. The drainage arc groove I406 is connected with the high pressure area, and the high pressure oil contact surface is introduced to form a high pressure floating space; The force is directed to the rear "8" type sleeve 6, the axial force received by the driven gear shaft 8 is directed to the front "8" type sleeve 4, and the two contact surfaces are subjected to different forces, so the arc on the contact surface of the driven gear shaft 8 The angle of the groove II409 is 80°, the angle of the arc groove I408 on the contact surface of the driving gear shaft is 40°, the outer diameter of the two arc grooves is smaller than the radius of the gear root circle to avoid communication leakage; the front "8" type sleeve 4 is connected to the driving gear shaft. 1. A circular arc groove III410 is opened on the inner surface of the connected through hole, which is connected to the drainage arc groove II407; the inner surface of the blind hole connected with the driven gear shaft is opened with an arc groove IV411, which is connected to the drainage arc groove I406; The shaft segment forms an oil film, which not only floats the rotating shaft and avoids the mechanical wear of contact, but also compensates the radial force on the gear shaft due to the static pressure formed by the groove, because the radial force on the driven gear shaft is higher than that on the driving gear. The shaft is large, so the angle of arc groove IV411 is 60°, and the angle of arc groove III410 is 90°. The positions of the two arc grooves are close to the inner surface of one side of the oil outlet. The oil in the shaft hole is compensated and lubricated by force, and the pressure is reduced. , the temperature rises, and the low pressure area is introduced through the hole I404, forming an open-loop oil circuit, forming an open-loop oil circuit, the dynamic high-pressure oil introduced, maintains a constant dynamic pressure, and takes away the high-temperature oil to reduce the hydraulic gear pump. the internal temperature. The principle of the rear "8" type sleeve 6 is the same as that of the front "8" type sleeve 4, so it will not be described in detail.

In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and Simplifies the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation on the present invention, in addition, the terms "first", "second", etc. It is only for the purpose of description, and should not be understood as indicating or implying relative importance or indicating the number of technical features indicated, thus, the features defined with "first", "second", etc. can be expressed or implied. including one or more of the features, in the description of the present invention, unless otherwise stated, "a plurality" means two or more.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection connection, or integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components, for those of ordinary skill in the art, The specific meanings of the above terms in the present invention can be understood through specific situations

Although the specific embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by those of ordinary skill in the art, various Such changes, modifications or deformations without creative work are still within the protection scope of the present invention.

Claims (5)

1. A hydraulic gear pump, its characterized in that: the pump comprises a driving gear shaft (1), a lip-shaped sealing ring (2), a front end cover (3), a front 8-shaped sleeve (4), a pump body (5), a rear 8-shaped sleeve (6), a rear end cover (7), a driven gear shaft (8), a positioning pin hole (9), a pump outlet (10) and a fixing bolt hole (11); the side surfaces of the front end cover (3) and the rear end cover (7) which are in contact with the pump body (5) are provided with through 8-shaped through grooves, and sealing O-shaped rings are arranged in the through grooves; the front end cover (3) is arranged on the left side of the pump body (5); the front 8-shaped sleeve (4) is arranged on the left side inside the pump body (5); the driving gear shaft (1) penetrates through the front end cover (3) and the front 8-shaped sleeve (4) and is installed in the pump body (1), and the left side surface of a gear section of the driving gear shaft is in contact with the right side surface of the front 8-shaped sleeve (4); the rear 8-shaped sleeve (6) is in contact with the right side of the gear section of the driving gear shaft (1) and is positioned on the right side inside the pump body (5); the driven gear shaft (8) penetrates through the front 8-shaped sleeve (4) and the rear 8-shaped sleeve (6) and is arranged in the pump body (5), and the gear section of the driven gear shaft is meshed with the gear section of the driving gear shaft (1); the rear end cover (7) is arranged on the right side of the pump body (5); the lip-shaped sealing ring (2) penetrates through the left shaft section of the driving gear shaft (1) and is installed on the left side of the front end cover (3); the pump outlet (10) is arranged in the center of the upper side surface and the lower side surface of the pump body (5); the positioning pin hole (9) is positioned at the joint of the front end cover (3) and the rear end cover (7) and the pump body (5) respectively; the fixing bolt hole (11) penetrates through the front end cover (3), the pump body and the rear end cover (7) and is fixed by a nut.

2. A hydraulic gear pump according to claim 1, characterized in that: the front contact surface of the front 8-shaped sleeve (4) is the contact surface with the gear section, and the rear contact surface is the contact surface with the pump body (5); a through hole and a blind hole are formed in the front 8-shaped sleeve (4), a driving gear shaft (1) is installed in the through hole, and a driven gear shaft (8) is installed in the blind hole; the rear contact surface is provided with two positioning holes I (401), two positioning holes II (402) and a sealing groove I (403); the arc surface on the upper side of the front 8-shaped sleeve (4) is provided with a drainage arc groove I (406) and a drainage arc groove II (407), and a plane opening II (405) between the arc surfaces is communicated with a positioning hole II (402); the arc surface of the lower side of the front 8-shaped sleeve (4) is respectively provided with a hole I (404) which is respectively communicated with the through hole and the blind hole; an arc groove I (408) is formed beside the through hole on the front contact surface, and an opening is formed in the front contact surface and communicated with a drainage arc groove II (407); an arc groove II (409) is formed beside the blind hole on the front contact surface, and an inner opening is communicated with the drainage arc groove I (406); an arc groove III (410) is formed in the inner wall of the blind hole close to the front contact surface, and an opening is formed in the inner wall of the blind hole and communicated with a drainage arc groove II (407); an arc groove IV (411) is formed in the inner wall of the through hole close to the front contact surface, and the inner opening is communicated with the drainage arc groove I (406).

3. A hydraulic gear pump according to claim 2, characterized in that: the angle of the arc groove I (408) is 40 degrees, the angle of the arc groove II (409) is 80 degrees, and the outer diameters of the two arc grooves are smaller than the root circle radiuses of the gear sections of the driving gear shaft (1) and the driven gear shaft (8); the angle of the arc groove III (410) is 60 degrees, and the angle of the arc groove IV (411) is 90 degrees.

4. A hydraulic gear pump according to claim 3, characterized in that: the difference between the rear 8-shaped sleeve (6) and the front 8-shaped sleeve (4) is that a sealing groove II (601) is formed in the center of a sealing groove I (403) on the rear contact surface, the sealing groove II (601) is a gourd-shaped groove, two holes are blind holes, the angle of the arc groove I (408) is 80 degrees, the angle of the arc groove II (409) is 40 degrees, the angle of the arc groove III (410) is 90 degrees, and the angle of the arc groove IV (411) is 60 degrees.

5. A hydraulic gear pump according to claim 4, characterized in that: the front 8-shaped sleeve (4) and the rear 8-shaped sleeve (6) are respectively arranged on the left side and the right side of the driving gear shaft (1) and the driven gear shaft (8), and the front 8-shaped sleeve (4) and the rear 8-shaped sleeve (6) are symmetrically arranged on the left side and the right side.

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