Hydraulic motor with floating oil seal protection

Abstract

The application discloses a hydraulic motor with a floating oil seal protection device, which comprises a motor assembly, a shell covering the motor assembly, and a speed reduction assembly connected with one end of the motor assembly, wherein a gear ring is arranged on the speed reduction assembly, a first matching gap is arranged at the joint of the motor assembly and the gear ring, an annular sleeve is arranged on the outer side of the first matching gap, a groove is arranged on the end face of the sleeve close to the gear ring, a sealing ring is arranged annularly on the gear ring in the groove, the sealing ring is in interference fit with the gear ring, and an O-shaped ring is arranged on the outer side of the sealing ring. The protection device of the floating oil seal at the joint of the motor assembly and the speed reduction assembly is added, so that the problem that impurities are easily introduced into the gap between the motor assembly and the speed reduction assembly, the floating oil seal is abraded and corroded, and the speed reduction assembly is damaged or leaks oil is solved.

Description

A hydraulic motor with a floating oil seal protection device Technical Field

[0001] This invention relates to the field of hydraulic motor technology, and in particular to a hydraulic motor with a floating oil seal protection device. Background Technology

[0002] A hydraulic motor structure consists of two parts: a motor assembly and a reduction gear assembly. Existing designs leave a gap at the joint between these two assemblies to prevent mechanical jamming or wear between the reducer and motor assembly during rotation. To prevent internal gear oil or external impurities from leaking into this gap, paired floating oil seals are used. However, in actual operation, some impurities can enter the housing or gear ring's floating oil seal cavity through the gap, causing wear and corrosion of the floating oil seal O-rings. This can lead to internal oil leakage from the gearbox or direct damage to the reduction gear assembly from external impurities. Therefore, providing a hydraulic motor with a floating oil seal protection device is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0003] One objective of this invention is to provide a hydraulic motor with a floating oil seal protection device. By adding a protection device for the floating oil seal at the junction of the motor assembly and the reduction assembly, this invention solves the problem that impurities can easily enter the gap between the original motor assembly and the reduction assembly, thereby wearing and corroding the floating oil seal, which in turn leads to oil leakage or damage to the reduction assembly.

[0004] A hydraulic motor with a floating oil seal protection device according to an embodiment of the present invention includes a motor assembly, a housing covering the motor assembly, and a reduction assembly connected to one end of the motor assembly. The reduction assembly is fitted with a gear ring. A first mating gap is provided at the joint between the motor assembly and the gear ring. A collar is circumferentially fitted outside the first mating gap. A groove is formed on the end face of the collar near the gear ring. A sealing ring is circumferentially fitted on the gear ring located in the groove. The sealing ring is interference-fitted with the gear ring. An O-ring is fitted outside the sealing ring.

[0005] Optionally, a venting threaded hole is provided on one side of the collar, and a venting valve is installed in the threaded hole. A yellow grease inlet is provided on the other side of the collar, and a screw plug is installed in the threaded hole.

[0006] Optionally, a floating oil seal is provided internally between the motor assembly and the reduction assembly.

[0007] Optionally, the vent valve and the plug have a tapered thread structure, and the vent valve and the plug are respectively connected to the vent thread hole and the yellow grease inlet through the tapered thread.

[0008] Optionally, a second mating gap of 1.5-2 mm is provided between the collar and the gear ring, and a first radial gap is provided between the collar and the housing. The roots of the first mating gap and the first radial gap are rounded. A second radial gap perpendicular to the second mating gap is provided between the gear ring and the collar.

[0009] Optionally, the grease inlet extends into the interior and is provided with a grease groove in the shell that communicates with the first radial gap.

[0010] Optionally, the sealing ring is a toothed sealing ring, the sealing ring material is one or more of PTFE, PTFE, PTFE, PTFE, UPE, PK, and PK, and the O-ring material is one or more of nitrile rubber and fluororubber.

[0011] Optionally, the collar is interference-fitted with the housing, and the collar and housing are assembled by heating the collar onto the housing with a flat bearing heating machine or by pressing the collar onto the housing.

[0012] The beneficial effects of this invention are:

[0013] This invention adds a protective device to the floating oil seal at the junction of the motor assembly and the reduction assembly, preventing impurities such as mud and sand from entering the housing or gear ring floating oil seal cavity through gaps and wearing down the floating oil seal. This avoids wear and corrosion of the floating oil seal, thereby preventing the possibility of oil leakage or damage to the reduction assembly. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 is a schematic diagram of the structure of a hydraulic motor with a floating oil seal protection device proposed in this invention;

[0016] Figure 2 is an enlarged structural schematic diagram of the hydraulic motor A with a floating oil seal protection device proposed in this invention.

[0017] In the diagram: 1-Motor assembly, 2-Housing housing, 3-Collar ring, 4-Air release valve, 5-Sealing ring, 6-O-ring, 7-Reduction assembly, 8-Floating oil seal, 9-Plug, 10-Gear ring, 11-Housing housing yellow grease groove, 12-Second mating gap, 13-First mating gap, 14-First radial gap, 15-Second radial gap, 16-Yellow grease inlet. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0019] Referring to Figures 1 and 2, a hydraulic motor with a floating oil seal protection device includes a motor assembly 1, a housing 2 covering the motor assembly 1, and a reduction assembly 7 connected to one end of the motor assembly 1. A floating oil seal 8 is provided inside the motor assembly 1 and the reduction assembly 7. A gear ring 10 is provided on the outer sleeve of the reduction assembly 7. A first mating gap 13 is provided at the joint between the motor assembly 1 and the gear ring 10. A collar 3 is provided annularly on the outer sleeve of the first mating gap 13. A groove is provided on the end face of the collar 3 near the gear ring 10. A sealing ring 5 is provided annularly on the gear ring 10 located in the groove, and the sealing ring 5 is interference-fitted with the gear ring 10. An O-ring 6 is provided on the outer sleeve of the sealing ring 5.

[0020] In this embodiment, it is possible to prevent external impurities from entering the housing 2 or the floating oil seal cavity of the gear ring 10 through the first fitting gap 13 at the joint between the motor assembly 1 and the reduction assembly 7 during actual operation, thus avoiding wear or corrosion of the floating oil seal O-ring 6. This would prevent gear oil inside the reduction assembly 7 from leaking from the first fitting gap 13 at the joint between the motor assembly 1 and the reduction assembly 7, or impurities from entering the reduction assembly 7 and directly damaging the reduction assembly 7. This is achieved by using the interference fit of the collar 3, sealing ring 5, and gear ring 10, and the O-ring 6 to wrap the first fitting gap 13 at the joint between the motor assembly 1 and the reduction assembly 7 within the cavity of the collar 3, thereby preventing the first fitting gap 13 from being exposed to the outside.

[0021] In this embodiment, an NPT1 / 8 venting threaded hole is provided on one side of the collar 3, and an NPT1 / 8 venting valve 4 is installed in the inner thread of the NPT1 / 8 venting threaded hole. A yellow grease inlet 16 is provided on the other side of the collar 3, and an NPT1 / 8 plug 9 is installed in the inner thread of the yellow grease inlet 16.

[0022] In this embodiment, the NPT1 / 8 vent valve 4 and the NPT1 / 8 plug 9 have a tapered thread structure, eliminating the need for a sealing ring and saving space. The threaded connection also makes installation convenient and quick, and provides high reliability. Alternatively, the NPT1 / 8 vent valve 4 can be replaced with the NPT1 / 8 plug 9, and the NPT1 / 8 grease inlet 16 can be replaced with an NPT1 / 8 grease nipple. The NPT1 / 8 vent valve 4 and the NPT1 / 8 plug 9 are connected to the NPT1 / 8 vent threaded hole and the grease inlet 16 respectively via tapered threads.

[0023] In this embodiment, adding this device to the existing hydraulic motor does not affect the installation of the hydraulic motor on equipment such as excavators, road rollers, and pavers. To avoid mechanical interference between the screws and the collar after the gear ring 10 and the gear disc are connected by screws on excavators, road rollers, pavers, etc., the outer diameter of the collar near the gear ring 10 needs to be smaller than the minimum diameter of the external threaded hole of the gear ring 10. To prevent the hydraulic motor reduction assembly 7 from mechanically jamming or wearing with the collar 3 during rotation, a second mating gap 12 needs to be provided between the collar 3 and the gear ring 10 in the design. The second mating gap 12 is 1.5-2mm. For different models and specifications of hydraulic motors, only the collar 3, sealing ring 5 and O-ring 6 of different sizes need to be replaced.

[0024] In this embodiment, a first radial gap 14 is provided between the collar 3 and the housing 3. Because the rounded corner of the lathe tool during lathe machining of the housing results in a chamfer at the root of the collar on the housing 2, to avoid mechanical interference, the roots of the first mating gap 13 and the first radial gap 14 are rounded. After the collar 3 is interference-fitted onto the housing 2, the O-ring 6 is fitted onto the sealing ring 5. Before assembly, yellow grease needs to be added or applied to the inside of the annular groove and the inner ring of the sealing ring 5 to improve the lubrication between the gear ring and the sealing ring during rotation. Since yellow grease is consumed during the use of the hydraulic motor, it needs to be added periodically. Finally, the O-ring 6 and the sealing ring are assembled. The assembly is installed into the annular groove of the collar. At this time, NPT1 / 8 yellow grease needs to be injected into the threaded hole and a grease fitting needs to be installed. The yellow grease is injected into the joint between the gear ring 10 and the sealing ring 5 through the yellow grease injection port 16, the yellow grease injection threaded hole, the yellow grease groove of the housing, the first radial gap 14, and the second radial gap 15 to improve the lubrication of the gear ring 10 and the sealing ring 5 when they rotate. At the same time, an NPT1 / 8 vent valve 4 is also set on the opposite side of the grease injection port to remove the gas in the cavity formed by the collar 3, the housing 2, the gear ring 10, and the sealing ring 5. A second radial gap 15 perpendicular to the second mating gap 12 is provided between the gear ring 10 and the collar 3.

[0025] The inner cavity formed by the collar 3, housing 2, toothed ring 10, and sealing ring 5 is pressureless. If the hydraulic motor needs to work in water, the sealing ring 5 will be under certain pressure through the second radial gap 15. Therefore, the O-ring 6 is installed facing the toothed ring 10. The smaller the second radial gap 15, the greater the pressure on the sealing ring 5 and O-ring 6.

[0026] In this embodiment, the yellow grease inlet 16 extends to the interior and is provided with a shell yellow grease groove 11 that communicates with the first radial gap 14.

[0027] In this embodiment, the second mating gap 12 is separated from the second radial gap 15, the first radial gap 14, and the first mating gap 13 at the interference fit between the sealing ring 5 and the toothed ring 10, so that impurities will not enter the floating oil seal and damage it, thus protecting the floating oil seal.

[0028] Because there is a second radial gap 15 between the collar 3 and the toothed ring 10, impurities may enter the annular groove of the collar 3 during actual operation, damaging the sealing ring 5 or the O-ring 6, and consequently wearing down the floating oil 8 and the O-ring 6. Therefore, the seal between the sealing ring 5 and the toothed ring 10 is made of a high-performance engineering plastic material. In this embodiment, the sealing ring 5 is a toothed sealing ring, and the material of the sealing ring 5 is one or a combination of PTFE4, PTFE2, PTFE3, PTFE5, UPE, PK1, and PK2, possessing properties such as corrosion resistance, wear resistance, impact resistance, and self-lubrication. With advantages such as absorbing impact energy, even if there is a lack of yellow grease inside, the wear on the sealing ring 5 will be very small. The O-ring 6 is made of one or more combinations of nitrile rubber and fluororubber, which is suitable for unidirectional sealing of hydraulic reciprocating and rotary motion. Due to the special sealing lip and thickness optimization design, it has a good sealing effect even in harsh media such as cement slurry. It also has the characteristics of long service life, low friction, small structural space, and convenient installation, use and maintenance. This prevents external impurities from entering the reduction assembly 7 through the second radial gap 15 and damaging the reduction assembly 7 or causing gear oil leakage inside the reduction assembly 7.

[0029] In this embodiment, the collar 3 and the housing 2 are interference-fitted. The collar 3 and the housing 2 are assembled by heating the collar 3 onto the housing 2 with a flat bearing heating machine or by pressing the collar 3 onto the housing 2. At the same time, the mechanical interference fit connection between the collar 3 and the housing 2 makes installation convenient and quick, saves space, and has a high degree of fixation. In other embodiments, the interference fit can also be fixed to the housing 2 by a threaded connection. During installation, the collar 3 and the housing 2 are mechanically limited to ensure that the collar is installed in the correct position on the housing 2.

[0030] This invention adds a protective device to the floating oil seal 8 at the junction of the motor assembly 1 and the reduction assembly 7, which prevents impurities such as mud and sand from entering the floating oil seal cavity of the housing 2 or the gear ring 10 through gaps and wearing down the floating oil seal 8. This avoids wear and corrosion of the floating oil seal 8, and thus prevents the reduction assembly 7 from leaking oil or being damaged.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A hydraulic motor with a floating oil seal protection device, characterized in that, The system includes a motor assembly (1), a housing (2) covering the motor assembly (1), and a reduction assembly (7) connected to one end of the motor assembly (1). A gear ring (10) is fitted over the reduction assembly (7). A first mating gap (13) is provided at the junction of the motor assembly (1) and the gear ring (10). A collar (3) is annularly fitted around the first mating gap (13). A groove is formed on the end face of the collar (3) near the gear ring (10). A sealing ring (5) is annularly fitted on the gear ring (10) within the groove, and the sealing ring (5) is interference-fitted with the gear ring (10). The outer sleeve is provided with an O-ring (6); a venting threaded hole is provided on one side of the collar (3), and a venting valve (4) is installed in the threaded hole; a yellow grease inlet (16) is provided on the other side of the collar (3), and a screw plug (9) is installed in the threaded hole; a floating oil seal (8) is provided between the motor assembly (1) and the reduction assembly (7); the venting valve (4) and the screw plug (9) are tapered thread structures, and the venting valve (4) and the screw plug (9) are connected to the NPT1 / 8 venting threaded hole and the yellow grease inlet (16) respectively through tapered threads.

2. A hydraulic motor with a floating oil seal protection device according to claim 1, characterized in that, A second mating gap (12) is provided between the collar (3) and the toothed ring (10), the second mating gap (12) being 1.5-2mm. A first radial gap (14) is provided between the collar (3) and the housing (2), the roots of the first mating gap (13) and the first radial gap (14) being rounded. A second radial gap (15) perpendicular to the second mating gap (12) is provided between the toothed ring (10) and the collar (3).

3. A hydraulic motor with a floating oil seal protection device according to claim 2, characterized in that, The yellow grease inlet (16) extends into the interior and is provided with a shell yellow grease groove (11) that communicates with the first radial gap (14).

4. A hydraulic motor with a floating oil seal protection device according to claim 1, characterized in that, The sealing ring (5) is a toothed sealing ring, and the material of the sealing ring (5) is one or more of PTFE4, PTFE2, PTFE3, PTFE5, UPE, PK1, and PK2. The material of the O-ring (6) is one or more of nitrile rubber and fluororubber.

5. A hydraulic motor with a floating oil seal protection device according to claim 1, characterized in that, The collar (3) is interference-fitted with the housing (2). The collar (3) and the housing (2) are assembled by heating the collar (3) with a flat bearing heating machine and then heat-fitting it onto the housing (2) or by pressing the collar (3) onto the housing (2).

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