Constant-pressure self-adaptive sealing type dustproof assembly for automobile driving shaft

Abstract

The invention relates to the technical field of automobile driving shafts, and discloses a constant-pressure self-adaptive sealing type automobile driving shaft dustproof assembly which comprises a hollow pipe, a welding shaft fork and a sliding sleeve are welded to the two ends of the hollow pipe respectively, the end of the sliding sleeve is slidably connected with a sliding shaft fork through a spline, and the outer side of the sliding joint of the sliding sleeve and the sliding shaft fork is sleeved with a dustproof cover. Dust cover supporting devices are arranged on the outer sides of the sliding sleeve and the sliding shaft fork. Each dust cover supporting device comprises a fixing base and a sliding gasket. Dustproof cover fixing rings are arranged on the outer sides of the two ends of the dustproof cover, the two ends of the dustproof cover are clamped between the dustproof cover fixing rings and the sliding gaskets, internal threads meshed with each other are arranged at the connecting positions of the inner sides of the dustproof cover fixing rings and the fixing base, and the force of the sliding gaskets for extruding the two ends of the dustproof cover can be controlled by adjusting rotation of the dustproof cover fixing rings. The constant-pressure self-adaptive sealing type dustproof assembly for the automobile driving shaft has the advantages of being high in dustproof effect and long in service life.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of automobile driving shafts, in particular to a constant-pressure self-adaptive sealing type automobile driving shaft dustproof assembly. BACKGROUND

[0002] The automobile driving shaft assembly plays a key role in the power transmission system of an automobile, and is susceptible to dust and other impurities due to a complex and harsh working environment. In order to improve the reliability and service life of the driving shaft assembly, it is of great significance to improve the dustproof structure thereof. The application discloses an improved scheme of a constant-pressure self-adaptive sealing type automobile driving shaft dustproof assembly, in particular to the dustproof optimization of the sliding part of the sliding axle yoke.

[0003] In the prior art, the following defects exist: 1. The sliding part of the sliding axle yoke often slides, and the dustproof sleeve installed by using a clamp is prone to loosening, which is very ineffective; 2. During the inward sliding of the spline, the gas in the spline is extruded and discharged, which causes the gas in the dustproof sleeve to increase during the contraction process, and when the contraction speed is too fast, extra pressure is generated at the gap of the dustproof sleeve, thereby affecting the service life. SUMMARY

[0004] (I) Technical problems solved In view of the defects in the prior art, the application provides a constant-pressure self-adaptive sealing type automobile driving shaft dustproof assembly, which has the advantages of strong dustproof effect and long service life, and solves the problems mentioned in the background.

[0005] (II) Technical scheme To achieve the above-mentioned purpose, the application provides the following technical scheme: A constant-pressure self-adaptive sealing type automobile driving shaft dustproof assembly, comprising a hollow pipe, a welded axle yoke and a sliding sleeve are welded at both ends of the hollow pipe, a sliding axle yoke is connected to the end of the sliding sleeve through a spline, the welded axle yoke and the sliding axle yoke are connected to a connecting fork through a cross shaft assembly, a dust cover is sleeved on the outer side of the sliding connection part of the sliding sleeve and the sliding axle yoke, dust cover supporting devices are arranged on the outer sides of the sliding sleeve and the sliding axle yoke, and the dust cover supporting devices comprise: A fixed seat is fixed on the outer side of the sliding sleeve or the sliding axle yoke, and an outer thread is arranged on the outer surface of the fixed seat; A sliding gasket is composed of a straight cylinder part and an inclined top part, one end of the straight cylinder part is connected to a groove on one side of the fixed seat in a sliding mode, and the other end of the straight cylinder part is fixedly connected to the inclined top part provided with an inclined surface; A spring is arranged in a cavity formed between the straight cylinder part and the outer side of the sliding sleeve or the sliding axle yoke, and the spring is fixed on the fixed seat and the straight cylinder part on the two sides thereof; Dust cover fixing rings are provided on the outer sides of both ends of the dust cover. The two ends of the dust cover are clamped in the middle by the dust cover fixing rings and sliding pads. The inner side of the dust cover fixing rings is provided with interlocking internal threads at the connection with the fixing base. By adjusting the rotation of the dust cover fixing rings, the force of the sliding pads squeezing the two ends of the dust cover can be controlled.

[0006] Preferably, the sliding sleeve and the sliding shaft fork are respectively provided with a splined sleeve and a splined rod at the sliding connection. The sliding sleeve has a sleeve cavity in the part that connects to the splined sleeve. A straight rod is detachably fixed to the end of the splined rod, and a sliding plug is provided at the end of the straight rod. The edge of the sliding plug is attached to the inner wall of the sleeve cavity. An air inlet is provided on the side of the sleeve cavity away from the splined sleeve. The sliding plug moves synchronously with the splined rod, thereby ensuring that the volume of the inner cavity at the front end of the splined rod remains unchanged, and preventing the air in the cavity from being squeezed into the space inside the dust cover during the sliding of the splined rod.

[0007] Preferably, a one-way air valve is provided in the air inlet of the sleeve, and an air passage is provided on the side wall of the part of the inner cavity of the sleeve away from the spline sleeve to connect to the spring cavity. The spring cavity is the space for the spring to move, and a one-way air valve is also provided in the air passage. The gas flow direction in the one-way valve in the air inlet of the sleeve is from the outside of the sliding sleeve into the inner cavity of the sleeve, and the gas flow direction in the one-way valve in the air passage is from the inner cavity of the sleeve into the spring cavity. The inner cavity of the sleeve is divided into two spaces by a sliding plug. The space located near the splined sleeve is the rear cavity, and the space located away from the splined sleeve is the front cavity. The function of the one-way valve in the air inlet of the sleeve is to draw gas into the front cavity through the piston movement of the sliding plug when the air pressure in the front cavity is too low. The function of the one-way valve in the air passage is to push gas into the spring cavity through the air passage when the air pressure in the spring cavity is too low. Maintaining high air pressure inside the spring cavity can improve sealing. In the event of a leak, the high-pressure gas will be preferentially discharged to the outside to prevent dust from entering. Furthermore, the one-way valves at the sleeve inlet and air passage, as well as the pushing and pulling action of the sliding plug, can automatically replenish the air pressure inside the spring cavity.

[0008] Preferably, when the spline rod moves to the deepest point inside the spline sleeve, the sliding plug does not reach the depth of the airway inlet.

[0009] Preferably, the sliding plug is connected to the end of the spline rod via a straight rod, and the straight rod and the end of the spline rod are connected by a threaded rotation.

[0010] Preferably, the middle part of the dust cover is designed with a bent wave shape to facilitate extension and straightening.

[0011] Preferably, the inner side of the dust cover fixing ring is configured to conform to the shape of the outer surface of the sliding pad.

[0012] Preferably, an air inlet is provided on the inner wall of the hollow tube, and a one-way air valve is provided inside the air inlet. The gas flow direction of the one-way air valve is from the outside of the hollow tube to the inside of the hollow tube, and a waterproof and breathable membrane is provided inside the air inlet.

[0013] (III) Beneficial Effects Compared with the prior art, the present invention provides a constant pressure self-adaptive sealing type dustproof assembly for automotive drive shafts, which has the following beneficial effects: 1. This constant pressure self-adaptive sealing type automotive drive shaft dust cover assembly is fixed by dust cover support devices and dust cover fixing rings respectively set on the inner and outer sides of the dust cover end. The dust cover support device is equipped with an elastic sliding pad. When the dust cover fixing ring and sliding pad are fixed on the inner and outer sides, the spring provides continuous compression force to the sliding pad, so that the clamping force on the dust cover will not weaken due to loosening. At the same time, the clamping force of the sliding pad on the dust cover can be controlled by adjusting the position of the dust cover fixing ring.

[0014] 2. This constant pressure self-adaptive sealing type automotive drive shaft dustproof assembly, by setting an inner cavity inside the spline sleeve and a sliding plug at the end of the spline rod, slides against the inner wall of the inner cavity of the sleeve. The sliding plug moves synchronously with the spline rod, thereby ensuring that the volume of the inner cavity at the front end of the spline rod remains unchanged. This prevents air in the cavity from being squeezed into the space inside the dustproof cover during the sliding of the spline rod, thus improving its service life.

[0015] 3. This constant pressure self-adaptive sealing type automotive drive shaft dustproof assembly uses one-way valves installed in the sleeve air inlet and air passage respectively. The function of the one-way valve in the sleeve air inlet is to draw gas into the front cavity through the piston movement of the sliding plug when the air pressure in the front cavity is too low. The function of the one-way valve in the air passage is to push gas into the spring cavity through the air passage when the air pressure in the spring cavity is too low. Maintaining high air pressure in the spring cavity can improve the sealing performance. In the event of leakage, high-pressure gas will be discharged outward first to prevent dust from entering. Furthermore, under the pushing and pulling action of the one-way valves in the sleeve air inlet and air passage, as well as the sliding plug, the air pressure in the spring cavity can be automatically replenished. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is an exploded view of the present invention.

[0018] Figure 3 This is a cross-sectional view of the present invention.

[0019] Figure 4 This is a cross-sectional view of the connection between the sliding sleeve and the sliding shaft fork of the present invention.

[0020] Figure 5 For the present invention Figure Four A magnified view of a portion of the inner cavity of the middle sleeve.

[0021] Figure 6 This is a schematic diagram of the sliding sleeve of the present invention.

[0022] Figure 7 This is a schematic diagram of the sliding shaft fork of the present invention.

[0023] Figure 8 This is a schematic diagram of the structure of the dust cover of the present invention.

[0024] Figure 9 This is a schematic diagram of the dust cover support device of the present invention.

[0025] Figure 10 This is a schematic diagram of the one-way air valve of the present invention.

[0026] In the diagram: 1. Hollow tube; 2. Welded shaft fork; 3. Sliding sleeve; 4. Sliding shaft fork; 5. Dust cover; 6. Cross shaft assembly; 7. Connecting fork; 8. Dust cover support device; 31. Splined sleeve; 32. Sleeve inner cavity; 321. Front cavity; 322. Rear cavity; 323. Spring cavity; 33. Sleeve air inlet; 34. Air passage; 41. Spline rod; 42. Joint fork; 43. Sliding plug; 51. Dust cover fixing ring; 81. Fixed base; 82. Sliding washer; 83. Spring; 821. Straight cylinder section; 822. Sloping top. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] Example 1: This embodiment provides a constant pressure self-adaptive sealing type automotive drive shaft dustproof assembly, which has the following technical features.

[0031] Please see Figures 1-10 A constant-pressure self-adaptive sealing type dustproof assembly for automotive drive shafts includes a hollow tube 1. Welded shaft forks 2 and sliding sleeves 3 are welded to both ends of the hollow tube 1. A sliding shaft fork 4 is slidably connected to the end of the sliding sleeve 3 via a spline. Both the welded shaft fork 2 and the sliding shaft fork 4 are connected to a connecting fork 7 via a cross shaft assembly 6. A dust cover 5 is fitted onto the outer side of the sliding connection between the sliding sleeve 3 and the sliding shaft fork 4. Dust cover support devices 8 are provided on the outer sides of both the sliding sleeve 3 and the sliding shaft fork 4. The dust cover support device 8 includes: The fixed seat 81 is fixed to the outside of the sliding sleeve 3 or the sliding shaft fork 4, and the outer surface is provided with external threads; The sliding pad 82 is composed of two parts: a straight cylindrical part 821 and an inclined top 822. One end of the straight cylindrical part 821 is slidably connected to a groove on one side of the fixed base 81, and the other end is fixedly connected to the inclined top 822, which is provided with an inclined surface. Spring 83 is provided in the cavity formed between the inside of the straight cylindrical part 821 and the outside of the sliding sleeve 3 or the sliding shaft fork 4. Spring 83 is fixed on both sides of the fixed seat 81 and the straight cylindrical part 821 respectively. Dust cover 5 has dust cover fixing rings 51 on the outer sides of both ends. The dust cover 5 is clamped in the middle by the dust cover fixing rings 51 and the sliding pads 82. The inner side of the dust cover fixing rings 51 is provided with interlocking internal threads at the connection between it and the fixing seat 81. By adjusting the rotation of the dust cover fixing rings 51, the force of the sliding pads 82 pressing on the two ends of the dust cover 5 can be controlled.

[0032] In an optional embodiment, the sliding sleeve 3 and the sliding shaft fork 4 are respectively provided with a splined sleeve 31 and a splined rod 41 at the sliding connection. The sliding sleeve 3 has a sleeve inner cavity 32 in the part that connects to the splined sleeve 31. A straight rod is detachably fixed to the end of the splined rod 41. A sliding plug 43 is provided at the end of the straight rod. The edge of the sliding plug 43 is attached to the inner wall of the sleeve inner cavity 32. A sleeve air inlet 33 is provided on the side of the sleeve inner cavity 32 away from the splined sleeve 31. The sliding plug 43 moves synchronously with the splined rod 41 to ensure that the volume of the inner cavity at the front end of the splined rod 41 remains unchanged, and to prevent the air in the cavity from being squeezed into the space inside the dust cover 5 during the sliding process of the splined rod 41.

[0033] In an optional embodiment, a one-way air valve is provided in the air inlet 33 of the sleeve, and the side wall of the part of the sleeve cavity 32 away from the spline sleeve 31 is connected to the spring cavity 323 by an air passage 34. The spring cavity 323 is the space for the spring 83 to move, and a one-way air valve is also provided in the air passage 34. The gas flow direction in the one-way valve in the air inlet 33 of the sleeve is from the outside of the sliding sleeve 3 into the inner cavity 32 of the sleeve, and the gas flow direction in the one-way valve in the air passage 34 is from the inner cavity 32 of the sleeve into the spring cavity 323. The inner cavity 32 of the sleeve is divided into two spaces by the sliding plug 43. The space located near the splined sleeve 31 is the rear cavity 322, and the space located away from the splined sleeve 31 is the front cavity 321. The function of the one-way valve in the air inlet 33 of the sleeve is to draw gas into the front cavity 321 through the piston movement of the sliding plug 43 when the air pressure in the front cavity 321 is too low. The function of the one-way valve in the air passage 34 is to push gas into the spring cavity 323 through the piston movement of the sliding plug 43 when the air pressure in the spring cavity 323 is too low. Maintaining high air pressure inside the spring cavity 323 can improve the sealing performance. In the event of a leak, the high-pressure gas will be discharged outward first to prevent dust from entering. Furthermore, under the push-pull action of the one-way valves of the sleeve inlet 33 and the air passage 34, as well as the sliding plug 43, the air pressure inside the spring cavity 323 can be automatically replenished.

[0034] In an alternative embodiment, when the spline rod 41 moves to the deepest point inside the spline sleeve 31, the sliding plug 43 does not reach the depth at the inlet of the air passage 34.

[0035] In an optional embodiment, the sliding plug 43 is connected to the end of the splined rod 41 by a straight rod, and the straight rod and the end of the splined rod 41 are connected by a threaded rotation.

[0036] In an optional embodiment, the middle portion of the dust cover 5 is configured as a bent wave shape to facilitate extension and straightening.

[0037] In an optional embodiment, the inner side of the dust cover retaining ring 51 is configured to conform to the shape of the outer surface of the sliding pad 82.

[0038] In an optional embodiment, an air inlet is provided on the inner wall of the hollow tube 1, and a one-way valve is provided inside the air inlet. The gas flow direction of the one-way valve is from the outside of the hollow tube 1 into the inside of the hollow tube 1, and a waterproof and breathable membrane is provided inside the air inlet.

[0039] In an optional embodiment, the sliding shaft fork 4 has a spline rod 41 at one end and two forks 42 at the other end, and the dust cover support device 8 is provided on the sliding shaft fork 4 near the spline rod 41.

[0040] In an optional embodiment, the pressure difference required for the one-way valve set in ·34 to open is greater than the pressure difference required for the one-way valve set in ·33 to open.

[0041] In summary, this constant pressure self-adaptive sealing type automotive drive shaft dustproof assembly is fixed by setting dustproof cover support device 8 and dustproof cover fixing ring 51 on the inner and outer sides of the dustproof cover 5 end respectively. The dustproof cover support device 8 is provided with an elastic sliding pad 82. When the dustproof cover fixing ring 51 and sliding pad 82 fix the dustproof cover 5 on the inner and outer sides, the spring 83 provides continuous compression force to the sliding pad 82, so that the clamping force on the dustproof cover 5 will not weaken due to loosening. At the same time, the clamping force of the sliding pad 82 on the dustproof cover 5 can be controlled by adjusting the position of the dustproof cover fixing ring 51.

[0042] This constant pressure self-adaptive sealing type automotive drive shaft dustproof assembly has an inner cavity 32 inside the spline sleeve 31 and a sliding plug 43 at the end of the spline rod 41. The sliding plug 43 slides against the inner wall of the inner cavity 32 and moves synchronously with the spline rod 41, thus ensuring that the volume of the inner cavity at the front end of the spline rod 41 remains unchanged. This prevents air from being squeezed into the space inside the dust cover 5 during the sliding of the spline rod 41, thereby improving its service life.

[0043] This constant pressure self-adaptive sealing type automotive drive shaft dustproof assembly uses one-way valves installed in the sleeve air inlet 33 and the air passage 34. The function of the one-way valve in the sleeve air inlet 33 is to draw gas into the front cavity 321 through the piston movement of the sliding plug 43 when the air pressure in the front cavity 321 is too low. The function of the one-way valve in the air passage 34 is to push gas into the spring cavity 323 through the piston movement of the sliding plug 43 when the air pressure in the spring cavity 323 is too low. Maintaining a high air pressure in the spring cavity 323 can improve the sealing performance. In the event of a leak, the high-pressure gas will be preferentially discharged to the outside to prevent dust from entering. Furthermore, under the pushing and pulling action of the one-way valves in the sleeve air inlet 33 and the air passage 34, as well as the sliding plug 43, the air pressure in the spring cavity 323 can be automatically replenished.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A constant pressure self-adapting sealing type automobile drive shaft dustproof assembly, comprising a hollow tube (1), a welded axle fork (2) and a sliding sleeve (3) welded at both ends of the hollow tube (1), respectively, and a sliding axle fork (4) slidably connected to the end of the sliding sleeve (3) through a spline, characterized in that: a dust cover (5) is sleeved on the outer side of the sliding connection between the sliding sleeve (3) and the sliding axle fork (4), and dust cover supporting devices (8) are arranged on the outer sides of the sliding sleeve (3) and the sliding axle fork (4); the dust cover supporting device (8) comprises: a fixed seat (81) fixed on the outer side of the sliding sleeve (3) or the sliding axle fork (4) and provided with external threads on the outer surface; a sliding gasket (82) composed of a straight cylinder part (821) and an inclined top part (822), the straight cylinder part (821) being slidably connected at one end to a groove on one side of the fixed seat (81) and the other end being fixedly connected to the inclined top part (822) provided with an inclined surface; and a spring (83) arranged in a cavity formed between the inside of the straight cylinder part (821) and the outer side of the sliding sleeve (3) or the sliding axle fork (4), the spring (83) being fixed at both sides to the fixed seat (81) and the straight cylinder part (821), respectively; the dust cover (5) is provided with dust cover fixing rings (51) on the outer sides of both ends, the dust cover (5) is clamped in the middle by the dust cover fixing rings (51) and the sliding gasket (82), and the inner side of the dust cover fixing ring (51) is provided with internal threads that are engaged with each other at the connection with the fixed seat (81). The sliding sleeve (3) and the sliding axle fork (4) are respectively provided with a spline sleeve (31) and a spline rod (41) at the sliding connection, the inside of the sliding sleeve (3) is provided with a sleeve inner cavity (32) at the part communicating with the spline sleeve (31), the end of the spline rod (41) is detachably fixed with a straight rod, the end of the straight rod is provided with a sliding plug (43), the edge of the sliding plug (43) is attached to the inner wall of the sleeve inner cavity (32), and the side of the sleeve inner cavity (32) away from the spline sleeve (31) is provided with a sleeve air inlet (33). The sleeve air inlet (33) is provided with a one-way air valve, the side wall of the part of the sleeve inner cavity (32) away from the spline sleeve (31) is provided with a gas channel (34) communicating with a spring cavity (323), the spring cavity (323) is a space for the spring (83) to move, and the gas channel (34) is also provided with a one-way air valve; The flow direction of the gas in the one-way air valve in the sleeve air inlet (33) is from the outside of the sliding sleeve (3) into the sleeve inner cavity (32), and the flow direction of the gas in the one-way air valve in the gas channel (34) is from the sleeve inner cavity (32) into the spring cavity (323); The sleeve inner cavity (32) is divided into two spaces by the sliding plug (43), the space on the side close to the spline sleeve (31) is a rear cavity (322), and the space on the side away from the spline sleeve (31) is a front cavity (321). When the spline rod (41) moves to the deepest part of the spline sleeve (31), the sliding plug (43) does not reach the depth of the inlet of the gas channel (34).

2. A constant pressure self-adapting sealing type dust-proof assembly for automobile driving shaft according to claim 1, characterized in that, ​ 3. A constant pressure self-adapting sealing type dust-proof assembly for automobile driving shaft according to claim 2, characterized in that, ​ ​ ​ 4. The constant pressure self-adapting sealing type dustproof assembly for automobile driving shaft according to claim 3, characterized in that, ​ 5. A constant pressure self-adapting sealing type dust-proof assembly for vehicle drive shaft according to claim 2, characterized in that, The sliding plug (43) is connected to the end of the spline rod (41) through a straight rod, and the straight rod is connected to the end of the spline rod (41) through threaded rotation.

6. A constant pressure self-adapting sealing dust-proof assembly for vehicle drive shaft according to claim 1, characterized in that, The middle part of the dust cover (5) is arranged in a bent wave shape, facilitating extension and straightening.

7. A constant pressure self-adapting sealing dust-proof assembly for vehicle drive shaft according to claim 1, characterized in that, The inner side of the dust cover fixing ring (51) is arranged as an inner contour matched with the shape of the outer surface of the sliding gasket (82).

8. A constant pressure self-adapting sealing type dust-proof assembly for vehicle drive shaft according to claim 3, characterized in that, The inner wall of the hollow pipe (1) is provided with an air inlet, the air inlet is provided with a one-way air valve, the gas flow direction of the one-way air valve is from the outside of the hollow pipe (1) to the inside of the hollow pipe (1), and the air inlet is provided with a waterproof and breathable film.

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