CN111810638B

CN111810638B - Shaft sleeve and box-type oil seal

Info

Publication number: CN111810638B
Application number: CN202010494609.4A
Authority: CN
Inventors: 钟勤俭
Original assignee: JIANGMEN XINHUI SEALING TECHNOLOGY CO LTD
Current assignee: Guangdong Xinhui Technology Co ltd
Priority date: 2020-06-03
Filing date: 2020-06-03
Publication date: 2022-08-19
Anticipated expiration: 2040-06-03
Also published as: CN111810638A

Abstract

The invention discloses a shaft sleeve and box type oil seal, comprising: a straight tube having a shoulder on an outer surface; the annular frame is sleeved on the outer side of the straight pipe, and the end face of the annular frame is abutted to the shoulder; the first rubber body is provided with a first rubber part attached to the inner surface of the straight pipe, a second rubber part attached to one side, close to the shoulder, of the annular frame, and a third rubber part attached to the outer surface of the straight pipe and connecting the first rubber part and the second rubber part. The shaft sleeve and the box-type oil seal can improve the strength of the shaft sleeve, reduce deformation and ensure the sealing effect.

Description

Shaft sleeve and box-type oil seal

Technical Field

The invention relates to an oil seal structure, in particular to a shaft sleeve and a box-type oil seal.

Background

Agricultural machinery is equipment specially used for agricultural production. Due to the wide variety of geographical environments, agricultural machinery is complex and harsh to work and is susceptible to impact loads, such as accidental impacts, stone touch, and the like.

In order to protect the bearings of agricultural machinery, cassette type oil seals have been designed.

Structurally, the box-type oil seal is provided with a shaft sleeve, a first ring and a second ring which are oppositely arranged.

Wherein, the suit that first ring and second ring rotate is sheathe in the axle sleeve, and first ring is fixed with the second ring to, form the lubrication chamber between first ring and the second ring.

Meanwhile, the shaft sleeve is formed by stamping a metal plate and is provided with a pipe body and a radial folded edge positioned at one end of the pipe body, the radial folded edge is positioned in the lubricating cavity, and the radial folded edge is in contact lubrication with grease in the lubricating cavity.

In addition, the shaft sleeve, the first ring or the second ring can be coated with a rubber body, so that gaps are made up, and sealing is ensured.

However, in use, the shaft sleeve is easy to deform, and further, the rubber body is driven to deform, so that the sealing effect is influenced.

Disclosure of Invention

The invention aims to solve at least one technical problem in the prior art, and provides a shaft sleeve and a box-type oil seal, which can improve the strength of the shaft sleeve, reduce deformation and ensure the sealing effect.

The invention is realized by the following technical scheme:

in a first aspect of the present invention, there is provided a shaft sleeve, including: a straight tube having a shoulder on an outer surface; the annular frame is sleeved on the outer side of the straight pipe, and the end face of the annular frame is abutted to the shoulder; the first rubber body is provided with a first rubber part attached to the inner surface of the straight pipe, a second rubber part attached to one side, close to the shoulder, of the annular frame, and a third rubber part attached to the outer surface of the straight pipe and connected with the first rubber part and the second rubber part.

According to the shaft sleeve of the first aspect of the present invention, the second rubber portion is provided with a first end face lip, and the first end face lip is arranged to be inclined toward the direction approaching the straight pipe.

According to the shaft sleeve in the first aspect of the present invention, a first radial lip is disposed at a connection portion of the second rubber portion and the third rubber portion, the first radial lip is disposed to be inclined in a direction away from the straight pipe, and the first radial lip is configured to abut against a second ring of the cartridge oil seal.

According to the shaft sleeve of the first aspect of the present invention, at least one end of the straight pipe projects to the outside of the cartridge type oil seal.

According to the shaft sleeve in the first aspect of the invention, the annular frame is welded and fixed with the straight pipe.

According to the shaft sleeve of the first aspect of the present invention, the first rubber body is bonded and fixed to the annular frame and the straight pipe.

According to a bushing according to a first aspect of the invention, the first rubber body covers a radially outer surface of the annular frame.

The first aspect of the invention provides a box-type oil seal, which comprises a first ring, a second ring and the shaft sleeve, wherein the first ring and the second ring are sleeved on the straight pipe, the annular frame is accommodated between the first ring and the second ring, the first ring is positioned on one side of the annular frame, which is back to the shoulder, and the second ring is positioned on one side of the annular frame, which is close to the shoulder.

According to the box type oil seal of the second aspect, the first ring is coated with the second rubber body, the second rubber body is provided with the second radial lip which abuts against the outer surface of the straight pipe, the second end face lip which abuts against the annular frame and the positioning rib which abuts against the edge of the annular frame, and the positioning rib is arranged on one side, away from the straight pipe, of the second end face lip.

According to a second aspect of the invention, the first ring is provided with an outer bead which clamps the edge of the second ring for fixation.

Has the advantages that: compared with the prior art, the shaft sleeve and the box-type oil seal are provided with the straight pipe and the annular frame, so that the shaft sleeve is formed by the straight pipe, the annular frame and the first rubber body, a metal plate stamping process is not needed for manufacturing the shaft sleeve, and further, the straight pipe and the annular frame can be manufactured by high-strength materials, so that the strength is improved, the first rubber body is supported powerfully, the deformation is reduced, and the sealing effect is ensured.

Meanwhile, the shaft sleeve is not manufactured by adopting a sheet metal stamping process, so that the thickness of the straight pipe is not limited, and the end face of the straight pipe can be used for bearing, and the axial load bearing capacity is improved.

Meanwhile, the first ring and the second ring of the box-type oil seal can still be manufactured by adopting a sheet metal stamping process, the influence of a shaft sleeve manufacturing process is avoided, and the manufacturing cost is reduced.

Drawings

The invention is further described below with reference to the drawings and examples;

fig. 1 is a schematic structural view of a cartridge type oil seal of the present invention;

FIG. 2 is a schematic structural view of the bushing of FIG. 1;

FIG. 3 is a schematic view of the first ring of FIG. 1;

fig. 4 is a schematic view of the structure of the second ring of fig. 1.

Reference numerals: 100-straight pipe, 110-shoulder, 120-annular frame, 130-first rubber body, 140-first rubber part, 150-second rubber part, 160-third rubber part, 170-first end face lip, 180-first radial lip, 190-first ring, 200-second ring, 210-second radial lip, 220-second end face lip, 230-positioning rib, 240-external curled edge and 250-second rubber body.

Detailed Description

Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings only for the convenience of description of the present invention and simplification of the description, and does 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.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1, an embodiment of a cartridge type oil seal is provided.

Structurally, the cartridge type oil seal is composed of a first ring 190, a second ring 200, and a bushing.

Referring to fig. 1 and 3, the first ring 190 is a ring-shaped metal shell, and the outer layer is wrapped with the second rubber body 250, so that the metal shell provides support and the second rubber body 250 is elastically sealed to satisfy the sealing effect.

Referring to fig. 1 and 3, the second rubber body 250 has two second radial lips 210, a second end lip 220, and a positioning rib 230.

Wherein the two second radial lips 210 abut against the radially outer surface of the sleeve, whereby the sealing effect can be ensured in a rotating state.

Wherein, second terminal surface lip 220 and location muscle 230 along the axis direction butt axle sleeve of axle sleeve, and then, along the axis direction location axle sleeve of axle sleeve, ensure that the installation is accurate.

Meanwhile, a cavity is formed between the second end face lip 220 and the positioning rib 230, so that the lubricating grease is stored and the abrasion is reduced.

Further, an outer flange 240 is formed on the edge of the first ring 190, and the outer flange 240 clamps the edge of the second ring 200, thereby sealing and fixing the first ring 190 and the second ring 200 together.

Referring to fig. 1 and 4, the second ring 200 is also an annular housing, an outer edge of the second ring 200 is fixed with the first ring 190, and an inner edge of the second ring 200 is formed with a flange, so that the second ring 200 and the sleeve are also formed with a lubrication chamber in the axial direction of the sleeve.

Meanwhile, referring to fig. 1, the end surfaces of the sleeve may protrude to the outside of the first and

second rings

190 and 200, and thus may contact other components to achieve axial load.

Referring to fig. 1 and 2, the bushing has a straight tube 100, an annular frame 120, and a first rubber body 130.

Wherein the outer surface of the straight pipe 100 is provided with a shoulder 110, so that the annular frame 120 abuts against the shoulder 110, positioning the annular frame 120 and ensuring the relative position of the annular frame 120 and the straight pipe 100.

The annular frame 120 and the straight pipe 100 may be an interference fit, so that the annular frame 120 and the straight pipe 100 rotate together to reduce friction.

In addition, the ring frame 120 and the straight pipe 100 may be welded, thereby improving the coupling strength.

Furthermore, the ring frame 120 and the straight pipe 100 can be heat treated together, further improving the strength and reducing the risk of deformation under impact load.

With respect to the first rubber body 130, referring to fig. 2, the first rubber body 130 has a first rubber portion 140 that conforms to the inner surface of the straight pipe 100, a second rubber portion 150 that conforms to the side of the annular frame 120 near the shoulder 110, and a third rubber portion 160 that conforms to the outer surface of the straight pipe 100 and connects the first rubber portion 140 and the second rubber portion 150.

The first rubber portion 140 ensures sealing inside the straight pipe 100, the second rubber portion 150 is fitted and sealed with the second ring 200, and the third rubber portion 160 ensures sealing between the ring frame 120 and the straight pipe 100.

Therefore, the supporting framework is formed by the straight metal pipe 100 and the annular frame 120, and the elasticity of the first rubber body 130 is utilized to realize sealing and simplify the structure.

Referring to fig. 2, the second rubber part 150 is provided with two first end face lips 170, and the first end face lips 170 are obliquely provided toward the direction of approaching the straight pipe 100.

Thereby, the first end face lip 170 is brought into elastic contact with the second ring 200, and thus, a sealing effect is secured under a rotating condition.

In addition, a first radial lip 180 is arranged at the joint of the second rubber part 150 and the third rubber part 160, the first radial lip 180 is arranged in an inclined manner towards the direction away from the straight pipe 100, and the first radial lip 180 is used for abutting against the second ring 200 of the box type oil seal.

Thus, the second ring 200 and the first ring 190 are positioned to achieve coaxial rotation fit, and eccentric wear is avoided.

Meanwhile, a lubrication chamber is also formed between the first end face lip 170 and the first radial lip 180, thereby storing lubricating grease required for rotation, making the cartridge type oil seal durable.

For the fixation of the first rubber body 130 to the straight pipe 100 and the annular frame 120 and the fixation of the second rubber body 250 to the second ring 200, a vulcanization molding process can be adopted, so that firm adhesion fixation is realized, and the dimension is ensured to meet the requirement.

Thus, the present embodiment has the following effects: the straight pipe 100, the annular frame 120 and the first rubber body 130 form a shaft sleeve, so that the shaft sleeve does not need to be manufactured by a sheet metal stamping process, and further, the straight pipe 100 and the annular frame 120 can be manufactured by high-strength materials, so that the strength is improved, the first rubber body 130 is powerfully supported, the deformation is reduced, and the sealing effect is ensured.

Meanwhile, the straight pipe 100 and the annular frame 120 can be assembled by hot pressing, so that the assembly difficulty is reduced, and the manufacturing cost is reduced.

Meanwhile, the shaft sleeve is not manufactured by adopting a sheet metal stamping process, so that the thickness of the straight pipe 100 is not limited, and the end face of the straight pipe 100 can be used for bearing, and the axial load bearing capacity is improved.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A bushing, comprising:

a straight tube (100) having a shoulder (110) on the outer surface;

the annular frame (120) is sleeved on the outer side of the straight pipe (100), and the end face of the annular frame is abutted to the shoulder (110);

a first rubber body (130) having a first rubber portion (140) attached to the inner surface of the straight pipe (100), a second rubber portion (150) attached to the side of the annular frame (120) close to the shoulder (110), and a third rubber portion (160) attached to the outer surface of the straight pipe (100) and connecting the first rubber portion (140) and the second rubber portion (150);

the straight pipe (100), the annular frame (120) and the first rubber body (130) form a shaft sleeve, so that the shaft sleeve does not need to be manufactured by a sheet metal stamping process, and further, the straight pipe (100) and the annular frame (120) can be manufactured by high-strength materials, so that the strength is improved, the first rubber body is powerfully supported, the deformation is reduced, and the sealing effect is ensured.

2. Bushing according to claim 1, wherein the second rubber part (150) is provided with a first end face lip (170), the first end face lip (170) being inclined towards the straight tube (100).

3. A bushing according to claim 1, wherein a first radial lip (180) is provided at the junction of the second rubber portion (150) and the third rubber portion (160), the first radial lip (180) is inclined away from the straight pipe (100), and the first radial lip (180) is used for abutting against the second ring (200) of the cartridge type oil seal.

4. A sleeve according to claim 3, wherein at least one end of said straight tube (100) protrudes outside the cartridge seal.

5. Bushing according to claim 1, wherein the annular frame (120) is welded to the straight tube (100).

6. Bushing according to claim 1, wherein the first rubber body (130) is adhesively fixed to the annular frame (120) and to the straight tube (100).

7. Bushing according to claim 1, wherein the first rubber body (130) covers the radially outer surface of the annular frame (120).

8. A box type oil seal, characterized by comprising a first ring (190), a second ring (200) and a shaft sleeve according to any one of claims 1 to 7, wherein the first ring (190) and the second ring (200) are sleeved on the straight pipe (100), the annular frame (120) is accommodated between the first ring (190) and the second ring (200), the first ring (190) is positioned on the side of the annular frame (120) back to the shoulder (110), and the second ring (200) is positioned on the side of the annular frame (120) close to the shoulder (110).

9. The box type oil seal according to claim 8, wherein the first ring (190) is coated with a second rubber body (250), the second rubber body (250) is provided with a second radial lip (210) abutting against the outer surface of the straight pipe (100), a second end face lip (220) abutting against the annular frame (120), and a positioning rib (230) abutting against the edge of the annular frame (120), and the positioning rib (230) is arranged on one side of the second end face lip (220) far away from the straight pipe (100).

10. A cartridge oil seal according to claim 8, characterized in that the first ring (190) is provided with an external bead (240), the external bead (240) clamping the edge of the second ring (200) fixed.