CN209838963U - Transmission shaft sheath - Google Patents

Abstract

The utility model provides a transmission shaft sheath belongs to protecting pipe technical field. It has solved technical problem such as current transmission shaft sheath. This transmission shaft sheath is including being the hollow tubulose cover body, the cover body pastes and forms location fastening portion including being used for with transmission shaft outer wall circumference, be equipped with the ventilation groove on the inner wall of fastening portion, its characterized in that, the ventilation groove has continuous leading-in section and middlings section, form the acute angle contained angle between the end of leading-in section and the head end of middlings section. The utility model discloses can prevent when can alleviating constant velocity cardan joint internal pressure that the grease in the constant velocity cardan joint from revealing.

Description

Transmission shaft sheath

Technical Field

The utility model belongs to the technical field of the protecting pipe, concretely relates to transmission shaft sheath.

Background

A propeller shaft for an automobile includes a front shaft, a rear shaft, a constant velocity joint connecting the front shaft and the rear shaft, and a fixing member fixing the constant velocity joint to the propeller shaft. The propeller shaft boot is generally disposed between the mount and the propeller shaft for preventing leakage of grease inside the constant velocity joint. The transmission shaft sheath is generally in a hollow tubular shape, one end of the transmission shaft sheath is larger, the other end of the transmission shaft sheath is smaller, the transmission shaft sheath is sleeved on the transmission shaft during installation, the large end of the transmission shaft sheath is inserted into the fixing piece,

during the running process of an automobile, the rotation speed of a transmission shaft is more than 2 times of that of a wheel, and the rotation speeds of a constant velocity universal joint on the transmission shaft and the transmission shaft are consistent, namely the rotation speed of the constant velocity universal joint is more than 2 times of that of the wheel, so that the high rotation speed easily causes the high temperature and high pressure inside the constant velocity universal joint. To prevent the constant velocity joint from being cracked due to excessive internal pressure, a ventilation groove is generally provided in the propeller shaft boot.

The existing vent grooves are generally disposed on the inner wall of the propeller shaft boot and extend axially along the propeller shaft boot to an end surface communicating with the outside to release the internal pressure of the constant velocity universal joint. However, although this propeller shaft boot can adjust the internal pressure of the constant velocity joint, it is easy to cause the grease inside the constant velocity joint to leak out through the vent grooves, resulting in lack of lubrication of the grease inside the constant velocity joint, wear, and leakage of the grease to the outside of the propeller shaft boot and even to the underbody, which is likely to cause customer complaints.

Disclosure of Invention

The utility model discloses to the above-mentioned problem that prior art exists, provide a transmission shaft sheath, the utility model aims to solve the technical problem that: how to make the transmission shaft sheath can alleviate the internal pressure of the constant velocity universal joint and can prevent the grease in the constant velocity universal joint from leaking.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a transmission shaft sheath, is including being the hollow tubulose cover body, the cover body is including being used for leaning on with transmission shaft outer wall circumference and forming the fastening portion of location, be equipped with the ventilation groove on the inner wall of fastening portion, the ventilation groove has continuous leading-in section and middling section, form the acute angle contained angle between the terminal of leading-in section and the head end of middling section.

Fastening portion pastes with transmission shaft outer wall circumference and leans on and forms the location for when the axis of rotation passes the transmission shaft sheath, the outer wall of axis of rotation closely laminates with the inner wall of fastening portion, and the outer wall of axis of rotation forms clearance fit with the position on the transmission shaft sheath except that fastening portion, thereby ensures when the transmission shaft passes the ventilation groove, and the ventilation groove can supply the gas circulation at fastening portion both ends. The ventilation groove has consecutive induction zone and middlings, and the end of induction zone and the head end of middlings form the acute angle contained angle, compares in prior art along the ventilation groove of transmission shaft sheath axial setting, and this patent is favorable to increasing the circulation route in ventilation groove, reduces the speed that the grease flows along the ventilation groove to make the interlude form circuitous district, make the grease form the backward flow at the interlude, can effectively prevent that the grease in the constant velocity universal joint from revealing.

In the transmission shaft sheath, the ventilation groove is also provided with a leading-out section connected with the tail end of the middle section, and an acute included angle is formed between the tail end of the middle section and the head end of the leading-out section. The setting of derivation section is favorable to gas to flow through interlude, derivation section in proper order from the induction section, and the acute angle contained angle between terminal and the derivation section head end of interlude is favorable to increasing the resistance that the grease flowed along the ventilation groove simultaneously to ensure that the grease in the constant velocity universal joint can not take place to reveal along the ventilation groove.

In the transmission shaft sheath, the ventilation groove is S-shaped or Z-shaped. This kind of structure setting is favorable to increasing the resistance that grease flows along the ventilation groove to ensure that grease in the constant velocity joint can not take place to reveal along the ventilation groove.

In the transmission shaft sheath, the number of the ventilation grooves is three. The ventilation groove number is too few, is unfavorable for the high temperature high pressure in the release constant velocity cardan joint, and the ventilation groove number is too much, and the processing preparation of being not convenient for, the setting in three ventilation groove in time alleviates the inside high temperature high pressure of constant velocity cardan joint when can preventing that the grease in the constant velocity cardan joint from revealing.

In the transmission shaft sheath, the three ventilation grooves are uniformly arranged along the circumferential direction of the inner wall of the fastening part at intervals. The constant velocity universal joint has the advantages that the gas inside the constant velocity universal joint can be uniformly released, the connection stability of the transmission shaft sheath can be guaranteed, looseness is not prone to occurring, and therefore grease in the constant velocity universal joint can be guaranteed not to leak.

In the transmission shaft sheath, the sheath body further comprises a flared part connected with the tail end of the fastening part, and the aperture of the flared part is larger than that of the fastening part. The setting of flaring portion, the transmission shaft of being convenient for passes the flaring portion and forms clearance fit with the flaring portion, makes the internal diameter of cover of ventilation groove outer end department be less than the internal diameter of the interior end department of flaring portion, can ensure ventilation groove and external intercommunication to ensure that the transmission shaft sheath can release the high temperature high pressure in the constant velocity universal joint, flaring portion still plays the effect that prevents its outflow to the grease that flows out by the ventilation groove simultaneously, further ensures that the transmission shaft sheath can prevent that the grease in the constant velocity universal joint from revealing.

In the transmission shaft sheath, the large end of the conical surface part is provided with a flange which is positioned outside the conical surface part and faces the small end of the conical surface part. The conical surface portion that the transmission shaft sheath was inserted inserts in the mounting of constant velocity universal joint and supports through the turn-ups and lean on the inner wall of mounting, is favorable to improving the connection steadiness of the cover body with the mounting to ensure that the grease in the constant velocity universal joint does not reveal

In the transmission shaft sheath, the flanging is gradually expanded from the large end of the conical surface part to the small end of the conical surface part. Therefore, the edge of the free end of the flanging has a larger diameter, so that the large end of the conical surface part can be conveniently inserted into the fixing piece, and the connection stability of the sleeve body and the fixing piece can be ensured.

Compared with the prior art, the utility model has the advantages of it is following: set up the ventilation groove on the inner wall of transmission shaft fastening portion, the ventilation groove has consecutive induction zone and middlings, and forms the acute angle contained angle between the end of induction zone and the head end of middlings, when making the ventilation groove realize gaseous circulation, the middlings in the ventilation groove forms circuitous district, has prolonged the circulation route in ventilation groove, reduces the speed that the ventilation groove flowed out along the grease, can effectively prevent that the grease in the constant velocity universal joint from revealing.

Drawings

Fig. 1 is a schematic structural diagram of the first embodiment.

FIG. 2 is a schematic diagram of another orientation of the embodiment.

FIG. 3 is a sectional view of the first embodiment.

FIG. 4 is a schematic view of a structure of the fixing member according to an embodiment.

In the figure, 1, a sleeve body; 11. a fastening section; 12. a conical surface portion; 13. a flared part; 2. a ventilation slot; 21. a lead-in section; 22. a middle section; 23. a lead-out segment; 4. flanging; 5. a fixing member; 51. a support cover; 52. and (4) shaping sleeves.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

Example one

As shown in fig. 1 and fig. 2, the present embodiment includes a sleeve body 1 in a hollow tubular shape, the sleeve body 1 includes a fastening portion 11, a tapered portion 12 and a flared portion 13, an outer end of the fastening portion 11 is connected to the flared portion 13, an inner end of the fastening portion 11 is connected to a small end of the tapered portion 12, and the fastening portion 11 is configured to be circumferentially attached to and positioned on an outer wall of the transmission shaft. The inner wall of the fastening part 11 is provided with three ventilation grooves 2, and the three ventilation grooves 2 are circumferentially and uniformly arranged along the inner wall of the sleeve body 1 at intervals. The big end of the conical surface part 12 is provided with a flange 4 which is positioned outside the conical surface part and faces the small end of the conical surface part 12, and the flange 4 is gradually expanded from the big end of the conical surface part 12. The ventilation groove 2 comprises a leading-in section 21 arranged from the inner end of the fastening part 11 to the outer end of the fastening part 11, a leading-out section 23 arranged from the outer end of the fastening part 11 to the inner end of the fastening part 11, and an intermediate section 22 connecting the leading-in section 21 and the leading-out section 23, wherein the tail end of the leading-in section 21 and the head end of the intermediate section 22 are connected to form an acute included angle, so that the intermediate section 22 forms a circuitous area, grease forms backflow in the intermediate section 22, and grease leakage in the constant velocity universal joint can be prevented. Simultaneously, the end of interlude 22 links to each other with the head end of derivation section 23 and forms the acute angle contained angle, is favorable to increasing the resistance that grease flows along ventilation groove 2, ensures that the grease does not take place to reveal.

Specifically, as shown in fig. 2 and 3, the ventilation slot 2 is S-shaped, which is beneficial to increase the resistance of grease flowing along the ventilation slot 2 and prevent grease leakage.

The diameter of the hole at the inner end of the flared portion 13 is larger than the diameter of the hole at the outer end of the fastening portion 11. And flared portion 13 can form clearance fit with the transmission shaft, can ensure ventilation groove 2 and external intercommunication to guarantee in the constant velocity joint that high-pressure gas can follow ventilation groove 2 and flow out, flared portion 13 plays the effect of preventing its outflow to the grease that flows out by ventilation groove 2 simultaneously, further ensures that the transmission shaft sheath can prevent that the grease in the constant velocity joint from revealing.

This embodiment still includes the protection casing, and the protection casing is hollow cylinder, and flared portion 13 inserts and locates in the protection casing. The protection casing plays the guard action to the outer end of transmission shaft, avoids it to expose and corrodes easily outside and rust, and on flared portion 13 was located to the protection casing cover, play the effect that prevents its exposure to the grease that flows out by flared portion 13, further ensured that the transmission shaft sheath can prevent that the grease in the constant velocity universal joint from revealing.

When the embodiment is installed on the transmission shaft, the sleeve body 1 is sleeved on the rotating shaft, the inner wall of the sleeve body 1 is attached to the outer wall of the transmission shaft in the circumferential direction to form positioning, and the conical surface part 12 is inserted into the fixing part 5 of the constant velocity universal joint. Specifically, as shown in fig. 4, the fixing member 5 includes a support cover 51 and a sizing sleeve 52, the large end of the tapered surface portion 12 is inserted into the sizing sleeve 52, and the edge of the free end of the flange 4 abuts against the inner wall of the sizing sleeve 52.

Example two

The technical solution of this embodiment is substantially the same as the technical solution of the first embodiment, and the difference is that the sleeve body 1 in this embodiment only includes the fastening portion 11 and the conical surface portion 12, the end of the fastening portion 11 is directly communicated with the outside, the ventilation slot 2 is in a Z shape, and the protective cover is sleeved on the fastening portion and abuts against the outer end of the shaping sleeve 52.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although 1, the sheath is used more herein; 11. a fastening section; 12. a conical surface portion; 13. a flared part; 2. a ventilation slot; 21. a lead-in section; 22. a middle section; 23. a lead-out segment; 4. flanging; 5. a fixing member; 51. a support cover; 52. formfitting, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims (9)

1. The utility model provides a transmission shaft sheath, is including being the hollow tubulose cover body (1), cover body (1) including being used for leaning on and forming location fastening portion (11) with transmission shaft outer wall circumference, be equipped with ventilation groove (2) on the inner wall of fastening portion (11), its characterized in that, ventilation groove (2) have continuous leading-in section (21) and middling section (22), form the acute angle contained angle between the terminal of leading-in section (21) and the head end of middling section (22).

2. Propeller shaft sheath according to claim 1, characterised in that the ventilation slot (2) further has a lead-out section (23) connected to the end of the intermediate section (22), the end of the intermediate section (22) and the head end of the lead-out section (23) forming an acute angle therebetween.

3. Propeller shaft sheath according to claim 2, characterised in that the ventilation slots (2) are S-shaped or Z-shaped.

4. A propeller shaft sheath according to claim 3, characterised in that the number of ventilation slots (2) is three.

5. Transmission shaft sheath according to claim 4, characterized in that three ventilation slots (2) are provided at even circumferential intervals along the inner wall of the fastening portion (11).

6. A propeller shaft sheath according to any one of claims 1 to 5, characterised in that the sheath body (1) further comprises a conical surface portion (12), the small end of the conical surface portion (12) being connected to the inner end of the fastening portion (11).

7. A propeller shaft sheath according to claim 6, characterised in that the sheath body (1) further comprises a flared portion (13) connected to the end of the fastening portion (11).

8. A propeller shaft sheath according to claim 6, characterised in that the large end of the conical surface portion (12) is provided with a flange (4) on the outside thereof facing the small end of the conical surface portion (12).

9. Propeller shaft sheath according to claim 8, characterised in that the flange (4) is arranged to be gradually flared from the large end of the conical surface portion (12) towards the small end of the conical surface portion (12).