CN217056317U

CN217056317U - Floating oil seal, motor speed reducer sealing structure and engineering machinery

Info

Publication number: CN217056317U
Application number: CN202220725114.2U
Authority: CN
Inventors: 吴俊杰; 浦秋林; 王挺
Original assignee: Suote Transmission Equipment Co Ltd
Current assignee: Suote Transmission Equipment Co Ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-07-26
Anticipated expiration: 2032-03-30

Abstract

The utility model provides a floating oil seal, motor reducer seal structure and engineering machine tool, this floating oil seal includes: a floating seal ring; the sealing ring and the floating seal ring are in butt joint to form an end face sealing structure, the thickness of the sealing ring in the axial direction is smaller than that of the floating seal ring in the axial direction, one of the sealing ring and the floating seal ring is a metal ring, and the other one of the sealing ring and the floating seal ring is a plastic ring. When the floating oil seal is used, the axial thickness of the sealing ring is smaller than that of the floating sealing ring, so that the installation requirement of a smaller-size space can be met. Furthermore, one of the floating seal ring and the seal ring is a metal ring, the other one of the floating seal ring and the seal ring is a plastic ring, and plastic has viscoelasticity, so that the compensatability to assembly tolerance accumulation, shaft eccentricity and end surface abrasion can be improved when the floating seal ring and the seal ring rotate relatively to generate friction, better sealing performance is obtained, and the defect that the floating oil seal used for a small-size space in the prior art is poor in sealing performance is overcome.

Description

Floating oil seal, motor speed reducer sealing structure and engineering machinery

Technical Field

The utility model relates to a mechanical seal technical field, concretely relates to floating oil seal, motor reducer seal structure and engineering machine tool.

Background

The floating oil seal is a mechanical seal with large consumption and wide application, and is widely applied to a traveling speed reducer of engineering machinery such as an excavator and the like. The floating oil seal generally comprises two floating seal rings, and when the two floating seal rings rotate relatively, the sealing end faces on the floating seal rings are tightly matched to realize sealing. However, for small-sized construction machines such as micro-excavation machines, the conventional floating oil seal is difficult to meet the installation requirement due to the small size of the traveling motor reducer.

For satisfying the installation demand in less size space, have the technical staff at present to adopt the sealing ring of other structures to replace a floating seal ring, form floating seal ring and sealing ring complex floating oil seal to shorten the holistic axial dimensions of structure through setting up of sealing ring. However, for this floating oil seal, since the seal ring is usually made of a precious alloy and has low elasticity, when the relative movement of the seal ring and the floating seal ring generates friction, the compensation performance of the seal ring to the assembly tolerance accumulation, the shaft eccentricity, the end surface abrasion and the like is inferior to that of the conventional floating oil seal, and the sealing performance is relatively poor.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the relatively poor defect of floating oil seal sealing performance who is used for small-size space among the prior art to a floating oil seal, motor reducer seal structure and engineering machine tool are provided.

In order to solve the problem, the utility model provides a floating oil seal, it is including floating seal ring and sealing ring. The floating seal ring and the sealing ring are in butt joint to form an end face sealing structure, the thickness of the sealing ring in the axial direction is smaller than that of the floating seal ring in the axial direction, one of the sealing ring and the floating seal ring is a metal ring, and the other one of the sealing ring and the floating seal ring is a plastic ring.

Optionally, a first sealing end face is arranged on one end of the floating seal ring, which faces the seal ring; one end of the sealing ring, which faces the floating sealing ring, is provided with a second sealing end face, and the second sealing end face is in butt joint with the first sealing end face.

Optionally, the floating oil seal further comprises a first sealing ring, and the first sealing ring is sleeved on the periphery of the floating sealing ring to form a floating sealing structure.

Optionally, the floating seal ring includes the reducing section, and by the one end that the floating seal ring deviates from the sealing ring to the one end towards the sealing ring, the external diameter of reducing section crescent, first sealing washer cover is established in the periphery of reducing section.

Optionally, the floating oil seal further comprises a second sealing ring, and the second sealing ring is sleeved on the periphery of the sealing ring to form a fixed sealing structure.

Optionally, a ring groove is arranged on the periphery of the sealing ring along the circumferential direction of the sealing ring, and the second sealing ring is arranged in the ring groove.

The utility model also provides a motor speed reducer seal structure, it includes motor housing, speed reducer housing and floating oil seal. Wherein, the speed reducer shell is butted with the motor shell; the floating oil seal is the floating oil seal, one of a floating seal ring and a sealing ring of the floating oil seal is arranged on the butt joint side of the motor shell and the speed reducer shell, and the other is arranged on the butt joint side of the speed reducer shell and the motor shell.

Optionally, a labyrinth seal structure is provided at the outer side in the radial direction of the floating oil seal at the interface of the motor housing and the reducer housing.

Optionally, a groove is arranged on the butt side of the motor shell and the speed reducer shell, a bulge is arranged on the butt side of the speed reducer shell and the motor shell, and the bulge and the groove are in clamping fit to form a labyrinth seal structure; and/or a bulge is arranged on the motor shell and the butt joint side of the speed reducer shell, a groove is arranged on the speed reducer shell and the butt joint side of the speed reducer shell and the motor shell, and the groove and the bulge are clamped and matched to form a labyrinth seal structure.

The utility model also provides an engineering machine tool, it includes as above floating oil seal, or as above motor reducer seal structure.

The utility model has the advantages of it is following:

1. the utility model provides a floating oil seal forms end face seal between its floating seal ring and the sealing ring, because the axial thickness of sealing ring is less than the axial thickness of floating seal ring, so can satisfy the installation demand in less size space. On the basis, one of the floating seal ring and the seal ring is set to be a metal ring, the other one of the floating seal ring and the seal ring is set to be a plastic ring, and plastic has viscoelasticity, so that the compensation performance of assembly tolerance accumulation, shaft eccentricity and end surface abrasion is improved when the floating seal ring and the seal ring rotate relatively to generate friction, and better sealing performance is obtained.

2. The utility model also provides a motor speed reducer seal structure through using the floating oil blanket that has smaller size, can realize littleer volume to guarantee the leakproofness of motor casing and speed reducer casing junction.

3. The utility model also provides an engineering machine tool, through using the floating oil blanket that has a smaller size or have the motor reducer seal structure of less size, can realize littleer volume to guarantee the leakproofness at relevant position.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 shows an overall structural schematic diagram of a floating oil seal provided by an embodiment of the present invention;

fig. 2 shows a schematic structural diagram of a floating seal ring in a floating oil seal provided by an embodiment of the present invention;

fig. 3 shows a schematic structural diagram of a sealing ring in a floating oil seal provided by an embodiment of the present invention;

fig. 4 shows a schematic structural diagram of a sealing structure of a motor reducer provided by an embodiment of the present invention.

Description of reference numerals:

10. a floating seal ring; 11. a first sealing end face; 12. a diameter-changing section; 20. a seal ring; 21. a second sealing end face; 22. a ring groove; 30. a first seal ring; 40. a second seal ring; 100. a motor housing; 101. a first groove; 102. a first protrusion; 200. a speed reducer housing; 201. a second protrusion; 202. a second groove; 300. and (5) floating oil seal.

Detailed Description

The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to 3, the present embodiment provides a floating oil seal including a floating seal ring 10 and a seal ring 20. The floating seal ring 10 and the seal ring 20 are arranged in a butt joint mode to form an end face seal structure, and the thickness of the seal ring 20 in the axial direction is smaller than that of the floating seal ring 10 in the axial direction. Meanwhile, the floating seal ring 10 is provided as a metal ring, and the seal ring 20 is provided as a plastic ring.

In this embodiment, referring to fig. 2 and 3, the thickness of the floating seal ring 10 in the axial direction is H1, the thickness of the seal ring 20 in the axial direction is H2, and the thickness of the seal ring 20 in the axial direction is smaller than the thickness of the floating seal ring 10 in the axial direction, that is, H2 is smaller than H1.

According to the arrangement, the axial thickness of the sealing ring 20 is smaller than that of the floating sealing ring 10, so that the overall axial size of the floating oil seal can be reduced, and the installation requirement of a smaller size space can be met. On this basis, through setting up floating seal ring 10 as the becket, set up sealing ring 20 as the plastics ring, can realize: on one hand, the plastic has certain hardness, so that the floating seal ring 10 and the seal ring 20 can rotate relatively, and end face sealing is realized; on the other hand, since the plastic has a certain viscoelasticity, when the floating seal ring 10 and the seal ring 20 rotate relatively and rub against each other, the compensatability for the assembly tolerance accumulation, the shaft eccentricity and the end face abrasion can be improved, and a better sealing performance can be obtained. Further, even if particle abrasive grains occur when the floating seal ring 10 and the seal ring 20 rub against each other, the particle abrasive grains can be embedded by the plastic, thereby increasing the service life of the floating oil seal.

Preferably, the sealing ring 20 can be made of engineering plastics such as phenolic resin, high temperature resistant nylon, polyarylsulfone, etc., and the working temperature of these materials can reach more than 120 ℃, and the compressive strength can reach more than 130 MPa.

In other embodiments, the floating seal ring 10 may be provided as a plastic ring and the seal ring 20 may be provided as a metal ring, which may have the same effect.

Next, the structure of the floating oil seal will be described further.

As shown in fig. 1 to fig. 3, a first sealing end face 11 is disposed on one end of the floating seal ring 10 facing the seal ring 20, a second sealing end face 21 is disposed on one end of the seal ring 20 facing the floating seal ring 10, and the second sealing end face 21 is in butt joint with the first sealing end face 11, so as to form an end face sealing structure. In this embodiment, the first sealing end face 11 and the second sealing end face 21 are both precision-ground surfaces.

As shown in fig. 1, the floating oil seal further includes a first sealing ring 30, the first sealing ring 30 is sleeved on the periphery of the floating seal ring 10 to form a floating sealing structure, so that the floating seal ring 10 can float to a certain extent when the floating seal ring 10 and the sealing ring 20 are butted, and further the floating seal ring 10 and the sealing ring 20 keep close contact to ensure end face sealing. In this embodiment, the first sealing ring 30 is an O-shaped rubber ring to provide elasticity to the floating seal ring 10, so that the floating seal ring 10 floats to a certain extent.

Further, referring to fig. 1 and 2, the floating seal ring 10 includes a reducing section 12, from one end of the floating seal ring 10 away from the seal ring 20 to one end of the floating seal ring 10 facing the seal ring 20, the outer diameter of the reducing section 12 is gradually increased, and the first seal ring 30 is sleeved on the outer periphery of the reducing section 12. Accordingly, when the first seal ring 30 is deformed, the first seal ring 30 provides a force to the floating seal ring 10 toward the seal ring 20, thereby ensuring a close contact between the floating seal ring 10 and the seal ring 20. In the present embodiment, the outer contour of the reducer section 12 is tapered.

As shown in fig. 1, the floating oil seal further comprises a second sealing ring 40, and the second sealing ring 40 is sleeved on the periphery of the sealing ring 20 to form a fixed sealing structure, so that when the floating sealing ring 10 is butted with the sealing ring 20, the sealing ring 20 is prevented from floating, and the whole floating oil seal is more stable and controllable. In this embodiment, the second seal ring 40 is also provided as an O-ring rubber ring.

Further, a ring groove 22 is provided on the outer periphery of the seal ring 20 along the circumferential direction of the seal ring 20, and a second seal ring 40 is provided in the ring groove 22. In the present embodiment, the annular groove 22 is disposed in the middle of the sealing ring 20, and except for the annular groove 22, other portions of the sealing ring 20 are disposed in an equal-diameter structure with the same outer diameter.

As shown in fig. 4, the present embodiment also provides a motor reducer sealing structure, which includes a motor housing 100, a reducer housing 200, and a floating oil seal 300. Wherein the motor housing 100 and the speed reducer housing 200 are arranged in a butt joint manner; the floating oil seal 300 is the floating oil seal as described above, the floating seal ring 10 in the floating oil seal 300 is provided on the side of the motor housing 100 that interfaces with the speed reducer housing 200, and the seal ring 20 is provided on the side of the speed reducer housing 200 that interfaces with the motor housing 100. When the motor and the speed reducer work, the floating seal ring 10 can be used as a static ring, the seal ring 20 can rotate along with the speed reducer shell 200 to be used as a movable ring, and the seal ring 20 rotates relative to the floating seal ring 10 to realize end face sealing.

In this embodiment, a first annular groove is provided on the motor housing 100 on the side of the motor housing abutting against the speed reducer housing 200, the floating seal ring 10 is installed in the first annular groove, and the first seal ring 30 is in close contact with the circumferential inner wall of the first annular groove; a second annular groove is provided on the reducer housing 200 on the side of the interface with the motor housing 100, and the seal ring 20 is installed in the second annular groove, and the second seal ring 40 is in close contact with the circumferential inner wall of the second annular groove.

In other embodiments, the floating seal ring 10 may be disposed on the side of the speed reducer case 200 that interfaces with the motor case 100, and the seal ring 20 may be disposed on the side of the motor case 100 that interfaces with the speed reducer case 200.

Further, a labyrinth seal structure is provided on the outer side in the radial direction of the floating oil seal 300 at the interface between the motor housing 100 and the reduction gear housing 200. At this moment, can effectively reduce the entering of impurity such as outside silt and rock particulate matter through labyrinth seal structure, avoid these impurity influences floating oil seal 300, guarantee sealed effect. In particular, in the embodiment, since the sealing ring 20 is made of plastic, the hardness thereof is relatively low, and the sealing ring is subjected to torsional stress, so that after the entry of hard impurities such as sand and the like is reduced, the sealing ring 20, particularly the second sealing end face 21 thereon, can be better protected, and the occurrence of sealing failure is avoided.

Specifically, a groove may be provided on the motor housing 100 on the side of the motor housing 200 that is in contact with the speed reducer housing 200, a protrusion may be provided on the speed reducer housing 200 on the side of the motor housing 100 that is in contact with the motor housing, and a labyrinth structure may be formed by the engagement between the protrusion and the groove. It is also possible to provide a projection on the motor housing 100 on the side of the interface with the gear housing 200 and a groove on the gear housing 200 on the side of the interface with the motor housing 100 to form a labyrinth structure.

In the present embodiment, referring to fig. 4, both the first groove 101 and the first protrusion 102 are provided on the motor housing 100 on the side of the gear housing 200, and both the second protrusion 201 and the second groove 202 are provided on the gear housing 200 on the side of the gear housing 100. The first groove 101 and the second protrusion 201 are in clamping fit, and the first protrusion 102 and the second groove 202 are in clamping fit, so that a labyrinth seal structure with a good sealing effect is formed.

The embodiment also provides engineering machinery which comprises the motor speed reducer sealing structure, so that the smaller size can be realized, and the sealing performance of the joint of the motor and the speed reducer is ensured. Specifically, the work machine may be a micro-excavator, a crane, a pump truck, or the like.

In the construction machine shown in other embodiments, the floating oil seal may be applied to other parts except for the connection part of the motor and the speed reducer, so as to meet the sealing requirement of the corresponding part.

According to the above description, the present application has the following advantages:

(1) adopt the floating oil seal of this application, can improve the compensatory nature of assembly tolerance accumulation, axle eccentricity, terminal surface wearing and tearing when floating seal ring 10 and sealing ring 20 relative rotation take place the friction, obtain better sealing performance, and accessible plastics inlay and hold the granule grit, increase floating oil seal's life.

(2) Through setting up labyrinth seal structure in motor housing 100 and reducer housing 200's butt joint department, can effectively reduce the entering of impurity such as outside silt and rock particulate matter, avoid impurity to cause adverse effect to floating oil seal, prevent sealed inefficacy.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.

Claims

1. A floating oil seal, comprising:

a floating seal ring (10);

the sealing ring (20) and the floating seal ring (10) are butted to form an end face sealing structure, the thickness of the sealing ring (20) in the axial direction is smaller than that of the floating seal ring (10) in the axial direction, one of the sealing ring (20) and the floating seal ring (10) is a metal ring, and the other is a plastic ring.

2. A floating oil seal according to claim 1, characterized in that the floating seal ring (10) is provided with a first sealing end face (11) towards one end of the seal ring (20);

one end, facing the floating seal ring (10), of the seal ring (20) is provided with a second seal end face (21), and the second seal end face (21) is in butt joint with the first seal end face (11).

3. The floating oil seal as defined in claim 1, further comprising a first seal ring (30), wherein the first seal ring (30) is sleeved on the outer periphery of the floating seal ring (10) to form a floating seal structure.

4. The floating oil seal of claim 3, characterized in that the floating seal ring (10) comprises a reducing section (12), the outer diameter of the reducing section (12) is gradually increased from the end of the floating seal ring (10) away from the sealing ring (20) to the end towards the sealing ring (20), and the first sealing ring (30) is sleeved on the periphery of the reducing section (12).

5. The floating oil seal according to any one of claims 1 to 4, further comprising a second seal ring (40), wherein the second seal ring (40) is sleeved on the periphery of the seal ring (20) to form a fixed sealing structure.

6. A floating oil seal according to claim 5, characterized in that, in the circumferential direction of the seal ring (20), an annular groove (22) is provided on the outer periphery of the seal ring (20), and the second seal ring (40) is provided in the annular groove (22).

7. A motor reducer sealing structure, comprising:

a motor housing (100);

a speed reducer housing (200) that is disposed in abutment with the motor housing (100);

the floating oil seal (300), the floating oil seal (300) is according to any one of claims 1-6, one of the floating seal ring (10) and the seal ring (20) of the floating oil seal (300) is arranged on the side of the motor housing (100) which is in butt joint with the speed reducer housing (200), and the other is arranged on the side of the speed reducer housing (200) which is in butt joint with the motor housing (100).

8. The motor reducer sealing structure according to claim 7, characterized in that a labyrinth structure is provided radially outside the floating oil seal (300) at a joint of the motor housing (100) and the reducer housing (200).

9. The motor reducer sealing structure according to claim 8, wherein a groove is provided on the motor housing (100) on the side of the gear housing (200) that interfaces with the motor housing (100), and a protrusion is provided on the gear housing (200) on the side of the gear housing (100) that interfaces with the motor housing, the protrusion and the groove being snap-fitted to form the labyrinth seal; and/or

The motor casing (100) on with the butt joint side of speed reducer casing (200) is provided with the arch speed reducer casing (200) on with the butt joint side of motor casing (100) is provided with the recess, the recess with protruding joint cooperation forms labyrinth seal structure.

10. A construction machine comprising a floating oil seal according to any one of claims 1 to 6, or a motor reducer sealing structure according to any one of claims 7 to 9.