CN217501971U - Radial static pressure balance floating type gear pump - Google Patents
Radial static pressure balance floating type gear pump Download PDFInfo
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- CN217501971U CN217501971U CN202122309241.2U CN202122309241U CN217501971U CN 217501971 U CN217501971 U CN 217501971U CN 202122309241 U CN202122309241 U CN 202122309241U CN 217501971 U CN217501971 U CN 217501971U
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Abstract
The utility model relates to a radial static pressure balance floating type gear pump, which comprises an upper plate, a middle plate, a lower plate, and a driving gear shaft, a driven gear shaft and a floating shaft sleeve which are positioned in a middle plate cavity, wherein two sides of the middle plate are respectively fixedly connected with the upper plate and the lower plate, the upper plate is provided with an interface and a blanking cover, gears on the driving gear shaft and the driven gear shaft are meshed with each other, and the driving gear shaft and the driven gear shaft are arranged in the floating shaft sleeves at two ends; the floating shaft sleeve is 8-shaped and comprises two symmetrical arc bodies, and the radius of the arc in the middle of each arc body is smaller than the radius of the arcs on two sides; a first groove and a second groove which have the same radius as the arc in the middle are respectively arranged on two sides of the arc body, the length of the first groove is the same as that of the arcs on two sides of the arc body, and the two end areas of the first groove are communicated; the length of the second groove is smaller than the arc lengths of the two sides of the arc body, and one end of the second groove is communicated with the middle of the arc body. The utility model discloses can show the volumetric efficiency who improves the gear pump, reduce the fluid leakage of gear pump.
Description
Technical Field
The utility model relates to a gear pump, concretely relates to radial static pressure balance floating gear pump.
Background
The gear pump is a typical hydraulic pump, has the advantages of large displacement, high power, compact rhythm, small flow pulsation, low noise and the like, and is widely applied to the fields of spaceflight, aviation, ships, engineering machinery and the like. The gear pump is usually provided with a floating shaft sleeve structure, and the clearance between the floating shaft sleeve and the end face of the gear is reduced through the axial displacement of the floating shaft sleeve. But under the abominable operating mode such as high temperature environment (more than 100 ℃), high inlet pressure, rotational speed dynamic variation scope are big, the vibration magnitude is big, the casing of gear pump can take place to warp under the effect of high-pressure fluid to lead to floating to have the jam between axle sleeve and the casing, can't play the effect of adjusting axial clearance, lead to the gear pump terminal surface to leak the increase, volumetric efficiency is showing and is reducing.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a radial static pressure balance floating gear pump solves under high pressure high temperature operating mode, and the problem of increase is leaked to unsteady axle sleeve removal bite, gear end face department fluid, has characteristics high temperature resistant, long service life, volume efficiency height.
In order to solve the above problem, the utility model adopts the following technical scheme: a radial static pressure balance floating type gear pump comprises an upper plate, a middle plate, a lower plate, a driving gear shaft, a driven gear shaft and a floating shaft sleeve, wherein the driving gear shaft, the driven gear shaft and the floating shaft sleeve are positioned in a cavity of the middle plate; the floating shaft sleeve is 8-shaped and comprises two symmetrical arc bodies, and the radius of the arc in the middle of each arc body is smaller than that of the arcs on the two sides; a first groove (close to the high-pressure side) and a second groove (close to the low-pressure side) which have the same radius as the arc of the middle part are respectively arranged on the two sides of the arc body, the length of the first groove is the same as that of the arcs on the two sides of the arc body, and the two end areas of the first groove are communicated; the length of the second groove is smaller than the arc lengths of the two sides of the arc body, and one end of the second groove is communicated with the middle of the arc body.
Furthermore, the depth of the first groove and the second groove is 3-5% of the diameter of the circular arcs on the two sides of the circular arc body, and the width of the first groove and the second groove is 8-15% of the thickness of the floating shaft sleeve.
Furthermore, the diameter of the circular arcs on the two sides of the circular arc body is 39mm, and the thickness of the circular arcs is 26 mm.
Further, the depth of the first groove and the second groove is 2mm, and the width of the first groove and the second groove is 3 mm.
Furthermore, the number of the first grooves and the number of the second grooves on the arc body are 2.
Furthermore, the middle plate is fixedly connected with the upper plate and the lower plate through screws, and is circumferentially positioned through cylindrical pins.
Furthermore, the contact end faces of the middle plate, the upper plate and the lower plate are provided with sealing grooves, and special-shaped sealing gaskets and special-shaped check rings are installed in the sealing grooves.
Furthermore, a combined sealing gasket is arranged at the shaft hole of the upper plate.
Furthermore, an O-shaped ring is arranged at the interface of the upper plate.
Furthermore, the floating shaft sleeve is made of tin bronze material, and the outer surface of the floating shaft sleeve is plated with silver.
Compared with the prior art, the utility model, its effect does: (1) the floating shaft sleeve of the utility model carries out local removal treatment on the existing floating shaft sleeve, can reduce the outside surface area of the floating shaft sleeve, reduce the local contact between the floating shaft sleeve and the middle plate, and locally remove the periphery of the floating shaft sleeve to ensure that high-pressure oil can enter a low-pressure area; (2) the peripheral local removal of the floating shaft sleeve can also act high-pressure oil on the middle plate, so that the compression deformation of the middle plate is reduced; (3) the utility model adopts the special-shaped check ring, the special-shaped sealing gasket, the O-shaped ring and the combined sealing gasket for sealing, thereby preventing the oil liquid from leaking; (4) the utility model discloses can improve the unsteady characteristic of unsteady axle sleeve, the fluid that reduces gear pump during operation gear terminal surface leaks, promotes the work efficiency of gear pump.
Drawings
Fig. 1 is an outline schematic diagram of the radial static pressure balance floating gear pump of the present invention.
Fig. 2 is a sectional view of the floating gear pump with radial static pressure balance of the present invention.
Fig. 3(a) and 3(b) are isometric views from two perspectives, respectively, of the high and low pressure sides of the floating bushing.
Fig. 4(a) is a schematic view of a conventional floating bushing, and fig. 4(b) is a schematic view of positions of the floating bushing and a gear pump on a high-low pressure side after a trimming process.
Fig. 5 is a high-pressure side view angle plan view of the floating shaft sleeve in the radial static pressure balance floating gear pump of the present invention.
Fig. 6 is a low-pressure side view angle plan view of the floating shaft sleeve in the radial static pressure balance floating gear pump of the present invention.
Description of the reference numerals: the device comprises a driving gear shaft 1, a driven gear shaft 2, a floating shaft sleeve 3, an upper plate 4, a middle plate 5, a lower plate 6, a plug cover 7, a special-shaped check ring 8, a special-shaped sealing gasket 9, a cylindrical pin 10, a screw 11, an O-shaped ring 12, a first groove 13 and a second groove 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
The embodiment of the utility model provides a radial static pressure balance floating type gear pump, as the hydraulic oil source of the whole vehicle hydraulic braking and hydraulic steering system of heavy vehicle, the structure thereof refers to fig. 1 and fig. 2, and comprises an upper plate 4, a middle plate 5, a lower plate 6, a driving gear shaft 1, a driven gear shaft 2 and a floating shaft sleeve 3 which are positioned in the cavity of the middle plate 5, the driving gear shaft 1 of the gear pump is meshed with the gear on the driven gear shaft 2, the two ends of the driving gear shaft 1 and the driven gear shaft 2 are installed in the floating shaft sleeve 3, the upper and lower sides of the gear are jointed with the floating shaft sleeve 3 to form the inner core of the gear pump, the two sides of the gear, the floating shaft sleeve 3 and the middle plate 5 form an oil inlet cavity and an oil outlet cavity, the middle plate 5 is connected with the upper plate 4 and the lower plate 6 through screws 11 and is circumferentially positioned through a cylindrical pin 10, the upper plate 4 is provided with an interface and a blanking cover 7, the interface of the upper plate 4 is provided with an O-shaped ring 12, the floating shaft sleeve 3 is positioned in the middle plate 5, one end face of the floating shaft sleeve 3 is flush with the end face of the middle plate 5 and is connected with the upper plate 4 and the lower plate 6, the floating shaft sleeve 3 is 8-shaped and comprises two symmetrical arc bodies, and the radius of the middle arc of each arc body is smaller than that of the two arc bodies; a first groove 13 and a second groove 14 which have the same radius as the arc in the middle are respectively arranged on two sides of the arc body, the length of the first groove 13 is the same as that of the arcs on two sides of the arc body, and the two end areas of the first groove are communicated; the length of the second groove 14 is smaller than the arc lengths of the two sides of the arc body, and one end of the second groove is communicated with the middle of the arc body; one side of the floating shaft sleeve 3, which is provided with the through first groove 13, is communicated with an oil inlet high-pressure area of the gear pump as shown in fig. 4, the contact surfaces of the middle plate 5, the upper plate 4 and the lower plate 6 are provided with sealing grooves for mounting a special-shaped sealing gasket 9 and a special-shaped retainer ring 8 to play a role in end face sealing, one end of the driving gear shaft 1 penetrates through the floating shaft sleeve 3 and extends out through a shaft hole in the upper plate 4 to be connected with a motor, and the shaft hole is sealed through a combined sealing gasket.
With reference to fig. 3, 4, 5 and 6, the floating shaft sleeve 3 is milled based on the existing floating shaft sleeve, is made of tin bronze, is silver-plated on the outer surface, and is subjected to peripheral local removal treatment, the depth of a groove of the floating shaft sleeve 3 is 2mm, the removal depth of material removal parts at each part of a set of gear pump is the same, the outer diameter of the floating shaft sleeve 3 is 39mm, the width is 3mm, and the thickness is 26 mm. Grooves are respectively processed on two sides of the floating shaft sleeve, which are close to the high-pressure oil discharge area and the low-pressure oil suction area of the gear pump, the grooves in the high-pressure area are completely communicated, and the grooves in the low-pressure area are not communicated, so that high-pressure oil in the high-pressure oil discharge area of the gear pump can act on one side of the floating shaft sleeve, which is close to the low-pressure oil suction area, through the grooves. The floating shaft sleeve 3 improved by the embodiment can improve the floating characteristic of the floating shaft sleeve from three aspects, and axial movement of the floating shaft sleeve compensates axial gaps on two sides of the gear, so that oil leakage during the working of the gear pump is reduced. Firstly, the outer surface area of the floating shaft sleeve can be reduced by local removal treatment, and the local contact between the floating shaft sleeve and the middle plate is reduced; secondly, the peripheral part of floating axle sleeve is got rid of and is made high-pressure oil can get into the low-pressure region, and high-pressure oil acts on floating axle sleeve low pressure side, reaches the radial force of balanced gear shaft, improves floating axle sleeve's superficial, reduces the pressurized deformation of medium plate. The improvement of above three aspect all can improve the unsteady characteristic of axle sleeve that floats, reduces the fluid leakage of gear pump during operation gear terminal surface, promotes the work efficiency of gear pump, and then promotes the working property and the working life of gear pump under high temperature high pressure operating mode.
When the gear pump works, the motor drives the driving gear shaft 1 to rotate, the gear on the driving gear shaft 1 rotates clockwise to drive the gear on the driven gear shaft 2, the gear teeth in the oil suction cavity are gradually disengaged, the space is enlarged to form partial vacuum, and oil enters the oil suction cavity under the action of external pressure; the gear teeth positioned in the oil outlet cavity gradually enter and are meshed with each other, oil between the gear teeth is extruded out and is discharged from the oil outlet, and when the gear rotates continuously, the gear pump continuously absorbs oil and discharges oil. When the gear pump works, the end face of the gear is abraded, a gap is formed between the end face of the upper plate and the end face of the lower plate, the floating shaft sleeve axially floats under the action of oil pressure, the end face of the gear is pushed to move, the gap caused by abrasion is compensated, and oil leakage of the gear pump is prevented.
Claims (10)
1. A radial static pressure balance floating type gear pump comprises an upper plate (4), a middle plate (5), a lower plate (6), a driving gear shaft (1), a driven gear shaft (2) and a floating shaft sleeve (3), wherein the driving gear shaft (1), the driven gear shaft (2) and the floating shaft sleeve (3) are positioned in a cavity of the middle plate (5), two sides of the middle plate (5) are fixedly connected with the upper plate (4) and the lower plate (6) respectively, the upper plate (4) is provided with a connector and a plugging cover (7), gears on the driving gear shaft (1) and the driven gear shaft (2) are meshed with each other, the driving gear shaft (1) and the driven gear shaft (2) are installed in the floating shaft sleeves (3) at two ends, one end face of the floating shaft sleeve (3) is flush with the end face of the middle plate (5), and one end face of the driving gear shaft (1) penetrates through shaft holes in the floating shaft sleeve (3) and the upper plate (4) to be connected with an external motor; the floating shaft sleeve (3) is 8-shaped and comprises two symmetrical arc bodies, and the radius of the arc in the middle of each arc body is smaller than that of the arcs on the two sides; a first groove (13) and a second groove (14) which have the same radius as the arc in the middle are respectively arranged on the two sides of the arc body, the length of the first groove (13) is the same as that of the arcs on the two sides of the arc body, and the two end regions of the first groove are communicated; the length of the second groove (14) is smaller than the arc lengths of the two sides of the arc body, and one end of the second groove is communicated with the middle of the arc body.
2. The radial hydrostatic balance floating gear pump according to claim 1, characterized in that the first grooves (13) and the second grooves (14) have a depth of 3 to 5% of the diameter of the circular arc on both sides of the circular arc body and a width of 8 to 15% of the thickness of the floating bushing (3).
3. The radial static pressure balance floating type gear pump according to claim 2, characterized in that the diameter of the circular arc on both sides of the circular arc body is 39mm, and the thickness is 26 mm.
4. The radial hydrostatic balance floating gear pump according to claim 2, characterized in that the first grooves (13) and the second grooves (14) are 2mm deep and 3mm wide.
5. The radial hydrostatic balance floating gear pump according to claim 1, characterized in that the number of the first grooves (13) and the second grooves (14) on the circular arc body is 2.
6. The radial hydrostatic balance floating gear pump according to claim 1, characterized in that the middle plate (5) is fixedly connected with the upper plate (4) and the lower plate (6) by means of screws (11) and is circumferentially positioned by means of cylindrical pins (10).
7. The radial static pressure balance floating type gear pump according to claim 1, characterized in that the contact end faces of the middle plate and the upper plate (4) and the lower plate (6) are provided with sealing grooves, and special-shaped sealing gaskets (9) and special-shaped retainer rings (8) are arranged in the sealing grooves.
8. Radial hydrostatic balance floating gear pump according to claim 1, characterized in that the shaft hole of the upper plate (4) is provided with a combined sealing gasket.
9. Radial hydrostatic balance floating gear pump according to claim 1, characterized in that at the interface of the upper plate (4) there is provided an O-ring (12).
10. The radial hydrostatic balance floating type gear pump according to any one of claims 1 to 9, characterized in that the floating bushing (3) is made of tin bronze material, and its outer surface is silver plated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122309241.2U CN217501971U (en) | 2021-09-22 | 2021-09-22 | Radial static pressure balance floating type gear pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122309241.2U CN217501971U (en) | 2021-09-22 | 2021-09-22 | Radial static pressure balance floating type gear pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217501971U true CN217501971U (en) | 2022-09-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122309241.2U Active CN217501971U (en) | 2021-09-22 | 2021-09-22 | Radial static pressure balance floating type gear pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217501971U (en) |
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2021
- 2021-09-22 CN CN202122309241.2U patent/CN217501971U/en active Active
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