Labyrinth type sealing dustproof driving motor for industrial vehicle

Abstract

The invention discloses a labyrinth type sealing dustproof driving motor for an industrial vehicle. The labyrinth type sealing dustproof driving motor comprises a dustproof assembly. The dustproof assembly comprises a first cover body and a second cover body which are detachably matched, the first cover body is arranged at the end close to the front end cover, and the first cover body is connected with the front end cover in a sleeved mode; the sealing ring is fixedly arranged on the output shaft in a sleeving mode, the first cover body and the second cover body are arranged on the outer side of the sealing ring in a covering mode, and gaps exist between the inner side walls of the first cover body and the second cover body and the sealing ring; sealing assemblies are arranged on the inner sides of the ends, away from each other, of the first cover body and the second cover body correspondingly, and driving assemblies are arranged at the positions, close to the sealing assemblies, of the outer side walls of the sealing rings correspondingly. Through the dustproof assembly, when the motor is in a static state, the sealing ring automatically presses the end face of the sealing ring under the action of the spring to achieve static sealing, and when the motor is in a running state, centrifugal force drives the ejector block to push the ring block, so that the sealing ring is automatically separated from the sealing ring, a non-contact gap is formed, and frictional wear is avoided.

Description

Technical Field

[0001] This invention belongs to the field of motor technology for industrial vehicles, and particularly relates to labyrinth-sealed dustproof drive motors for industrial vehicles. Background Technology

[0002] For industrial vehicle drive systems operating under harsh conditions, such as construction machinery, electric forklifts, and sanitation vehicles, these applications are often accompanied by high concentrations of pollutants such as dust, mud, and water mist. This poses a severe challenge to the cleaning and insulation performance of internal motor components, especially bearings and windings. Traditional static sealing methods, such as using O-rings or rubber gaskets, can prevent dust and moisture from entering to some extent, but they are prone to aging and deformation during long-term use, thus losing their sealing effect. Summary of the Invention

[0003] To address the problems in the prior art, the present invention proposes the following technical solution:

[0004] The present invention provides a labyrinth-type sealed dustproof drive motor for industrial vehicles, comprising: a front end cover disposed at the end of the motor body and an output shaft passing through the middle of the front end cover, and further comprising a dustproof component covering the connection between the output shaft and the front end cover;

[0005] The dustproof component includes:

[0006] The cover body 1 and the cover body 2 are detachable and can be fitted together. The cover body 1 is located at the end near the front cover and is sleeved with the front cover.

[0007] A sealing ring is fixedly sleeved on the output shaft. Cover body one and cover body two cover the outside of the sealing ring, and there is a gap between their inner sidewalls and the sealing ring.

[0008] A sealing component is provided on the inner side of the opposite ends of the first and second covers, and a driving component is provided on the outer wall of the sealing ring near the sealing component.

[0009] The sealing assembly includes a sealing ring that is elastically movable along the axial direction of the output shaft;

[0010] When the output shaft is stationary, the sealing ring abuts against the end of the sealing ring, and the gap between the mating surfaces of the sealing cover body one, cover body two and the sealing ring.

[0011] When the output shaft is rotating, the drive assembly drives the sealing ring away from the end of the sealing ring.

[0012] As a preferred embodiment of the above technical solution, the sealing assembly further includes a spring, which connects the sealing ring to the inner wall of the corresponding cover.

[0013] As a preferred embodiment of the above technical solution, the driving component includes: a plurality of fixed posts spaced apart circumferentially along the sealing ring, the fixed posts extending radially, a sleeve block slidably sleeved on the outside of the fixed posts, wherein a spring is sleeved on the outside of the fixed posts and located between the sleeve block and the sealing ring, and a top block is provided at one end of the sleeve block near the sealing ring.

[0014] A connecting rod is provided at one end of the sealing ring away from the output shaft, and a ring block is provided at the other end of the connecting rod. The ring block is movably arranged along the axial direction of the output shaft, and the end faces of the top block and the ring block that are close to each other are both set as inclined surfaces.

[0015] When the output shaft rotates, under the action of centrifugal force, the sleeve block slides along the fixed column to the side away from the sealing ring, causing the inclined end of the top block to abut against the inclined end of the ring block, so that the ring block drives the sealing ring away from the sealing ring through the connecting rod.

[0016] As a preferred embodiment of the above technical solution, a guide rod is further included, which is arranged axially along the output shaft and passes through the connecting rod, with the two slidingly engaged.

[0017] As a preferred embodiment of the above technical solution, the end face of the front cover near the cover body is provided with a plurality of protruding rings of different diameters and lengths, and the cover body is provided with grooves for the protruding rings to be inserted at the corresponding positions.

[0018] As a preferred embodiment of the above technical solution, both the first cover and the second cover are provided with a connecting part at their respective ends, and the connecting parts are connected by a through bolt.

[0019] The beneficial effects of this invention are as follows:

[0020] (1) The present invention, through the dustproof component, when the motor is stationary, the sealing ring automatically presses the end face of the sealing ring under the action of the spring to achieve a completely closed "static seal" to prevent condensate and dust from settling in during the shutdown period. When the motor is running, the centrifugal force drives the top block to push the ring block, so that the sealing ring automatically separates from the sealing ring to form a non-contact gap, avoiding friction and wear, and achieving "dynamic wear-free operation". This breaks through the limitation of traditional seals that are always in contact and thus easily damaged, and extends the seal life.

[0021] (2) The present invention forms multiple protective barriers by setting a multi-level nested structure (the convex ring on the front cover cooperates with the groove of the cover body), a labyrinthine tortuous channel and a dynamic centrifugal drive sealing switching mechanism, which effectively prevents external pollutants such as dust, mud, and water mist from invading the motor along the axial or radial direction, and greatly improves the reliability of the motor in a highly polluted environment. Attached Figure Description

[0022] Figure 1 The diagram shown is an overall schematic of the drive motor in the embodiment;

[0023] Figure 2 The diagram shown is a partial schematic of the drive motor in the embodiment;

[0024] Figure 3 What is shown is Figure 2 Schematic diagram of the cross-sectional structure in the middle;

[0025] Figure 4 What is shown is Figure 3 A magnified schematic diagram of the structure at point A in the middle;

[0026] Reference numerals: 1. Front cover; 2. Output shaft; 3. Dustproof assembly; 11. Cover body one; 12. Cover body two; 13. Connecting part; 20. Sealing ring; 30. Sealing assembly; 31. Sealing ring; 32. Spring one; 33. Connecting rod; 34. Ring block; 35. Guide rod; 40. Drive assembly; 41. Fixing post; 42. Sleeve block; 43. Spring two; 44. Top block; 101. Protruding ring; 110. Groove. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0028] Example

[0029] like Figure 1 As shown, Figure 1 The diagram shown is an overall schematic of the drive motor in the embodiment;

[0030] This device includes:

[0031] The front cover 1 and the output shaft 2 that pass through the middle of the front cover 1 are located at the end of the motor body;

[0032] It also includes a dustproof component 3 that covers the connection between the output shaft 2 and the front cover 1.

[0033] Dustproof component 3 is used to prevent external pollutants such as dust, mud, and water mist from entering the motor along the axial or radial direction, ensuring the cleanliness and insulation performance of the bearings and internal windings. It is especially suitable for industrial vehicle drive systems under harsh working conditions such as construction machinery, electric forklifts, and sanitation vehicles.

[0034] like Figure 2 , Figure 3 , Figure 4 As shown, Figure 2 The diagram shown is a partial schematic of the drive motor in the embodiment; Figure 3 What is shown is Figure 2 Schematic diagram of the cross-sectional structure in the middle; Figure 4 What is shown is Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0035] Dustproof component 3 includes:

[0036] The cover body 11 and the cover body 2 12 are detachable and can be fitted together. The cover body 11 is located at the end near the front cover 1 and is sleeved with the front cover 1.

[0037] The sealing ring 20 is fixedly sleeved on the output shaft 2. Cover body 11 and cover body 22 are covered on the outside of the sealing ring 20, and there is a gap between their inner sidewalls and the sealing ring 20.

[0038] A sealing assembly 30 is provided on the inner side of the opposite ends of the cover body 11 and the cover body 22, and a driving assembly 40 is provided on the outer wall of the sealing ring 20 near the sealing assembly 30.

[0039] The sealing assembly 30 includes a sealing ring 31 that is elastically movable along the axial direction of the output shaft 2;

[0040] When the output shaft 2 is stationary, the sealing ring 31 abuts against the end of the sealing ring 20, and the gap between the mating surfaces of the sealing cover 11, the cover 22 and the sealing ring 20;

[0041] When the output shaft 2 is rotating, the drive assembly 40 drives the sealing ring 31 away from the end of the sealing ring 20, so that the sealing ring 20 rotates synchronously with the output shaft 2.

[0042] Cover body 11 and cover body 2 12 form an external protective cover surrounding the output shaft 2. Cover body 11 is close to the front cover 1 and is sleeved and fixed to it to achieve axial positioning and initial sealing. Cover body 2 12 is located on the other side and together with cover body 11, they cover the outside of the sealing ring 20.

[0043] In the static state, i.e. when the motor is stopped, the end face of the sealing ring 31 is in close contact with the end of the sealing ring 20. At this time, the mating surfaces between the cover body 11, the cover body 22 and the sealing ring 20 form a closed sealing cavity, and external dust and moisture cannot enter through the axial gap, thus achieving "static sealing" and effectively preventing condensate and dust from settling in during shutdown.

[0044] In the operating state, i.e., when the motor is started, the output shaft 2 drives the sealing ring 20 to rotate synchronously. The drive assembly 40 on the sealing ring 20 causes the sealing ring 31 to disengage from the end face of the sealing ring 20. At this time, a small gap is formed between the sealing ring 31 and the sealing ring 20, avoiding rotational friction and achieving "dynamic non-contact operation".

[0045] The sealing assembly 30 also includes a spring 32, which connects the sealing ring 31 to the inner wall of the corresponding cover.

[0046] The drive assembly 40 includes: a plurality of fixed posts 41 spaced apart circumferentially along the sealing ring 20, the fixed posts 41 extending radially, a sleeve block 42 slidably sleeved on the outside of the fixed posts 41, wherein a spring 43 is sleeved on the outside of the fixed posts 41 and located between the sleeve block 42 and the sealing ring 20; a top block 44 is provided at one end of the sleeve block 42 near the sealing ring 31.

[0047] A connecting rod 33 is provided at the end of the sealing ring 31 away from the output shaft 2, and a ring block 34 is provided at the other end of the connecting rod 33. The ring block 34 is movably arranged along the axial direction of the output shaft 2.

[0048] The end faces of the top block 44 and the ring block 34 that are close to each other are both set as inclined surfaces.

[0049] When the output shaft 2 rotates, under the action of centrifugal force, the sleeve block 42 slides along the fixed column 41 to the side away from the sealing ring 20, causing the inclined end of the top block 44 to abut against the inclined end of the ring block 34, so that the ring block 34 drives the sealing ring 31 away from the sealing ring 20 through the connecting rod 33.

[0050] Specifically, the surface of the top block 44 near the end of the ring block 34 forms an outwardly contracting inclined plane. The inclination angle of this inclined plane is set according to actual needs to ensure that when the sleeve block 42 slides outward along the fixed column 41 under the action of centrifugal force, the top block 44 can effectively convert the radial motion into an axial pushing force on the ring block 34.

[0051] The end of the ring block 34 near the top block 44 is also provided with a matching inclined surface. When the ring block 34 is pushed by the top block 44, it can be driven to move along the axial direction of the output shaft 2 by the interaction force between the inclined surfaces, and then drive the sealing ring 31 away from the sealing ring 20 through the connecting rod 33.

[0052] Furthermore, it also includes a guide rod 35 arranged along the axial direction of the output shaft 2, the guide rod 35 passing through the connecting rod 33, and the two slidingly engaging.

[0053] The guide rod 35 is used to provide precise guiding support, thereby ensuring that the sealing ring 31 can move smoothly in the axial direction without deviation or jamming.

[0054] The front cover 1 has multiple protruding rings 101 of different diameters and lengths on its end face near the cover body 11. The cover body 11 has grooves 110 for the protruding rings 101 to be inserted into each of the corresponding positions.

[0055] The convex ring 101 protrudes axially, forming a multi-stage sealing step; the groove 110 is an annular groove, the depth and width of which match the size of the convex ring 101. When the cover body 11 is fitted onto the front cover 1, each convex ring 101 is embedded in the corresponding groove 110, achieving axial limiting and radial alignment; multiple convex rings 101 and grooves 110 are alternately fitted, forming a tortuous Z-shaped channel between the front cover 1 and the cover body 11. If dust, water mist and other pollutants want to enter the motor from the outside, they must change the flow direction multiple times, undergo multiple collisions and kinetic energy loss, significantly reducing the penetration capacity.

[0056] Specifically, both cover body 11 and cover body 2 12 are provided with a connecting part 13 at their respective ends that are close to each other, and the connecting part 13 is connected by a bolt.

[0057] The connecting part 13 can be an annular flange structure with multiple connecting holes evenly distributed along the circumference. Bolts pass through the through holes on the connecting part 13 and are locked in place with nuts.

[0058] Working principle: When the motor is stationary, under the action of spring 32, the sealing ring 31 tightly abuts against the end of the sealing ring 20 to form a closed sealing cavity. The convex ring 101 on the front cover 1 is embedded in the groove 110 of the cover body 11 to form a multi-level sealing step, which blocks external pollutants from entering. At this time, external dust and water vapor cannot enter the motor through the axial gap, realizing static sealing and effectively preventing condensate and dust from settling in during shutdown.

[0059] When the motor is running, the output shaft 2 drives the sealing ring 20 to rotate at high speed. Under the action of centrifugal force, the sleeve block 42 slides outward along the fixed column 41, stretching the spring 43. The inclined end of the top block 44 gradually abuts against the inclined end of the ring block 34, generating an axial component force, which pushes the ring block 34 to move axially along the output shaft 2. The ring block 34 drives the sealing ring 31 to move synchronously through the connecting rod 33, so that it is separated from the end face of the sealing ring 20, avoiding rotational friction and realizing dynamic non-contact operation. Even if a small amount of contaminants attempt to enter, they must pass through the tortuous channel between the cover and the rotating sealing ring 20.

[0060] Reset process: The rotation speed decreases, the centrifugal force disappears, the sleeve block 42 resets under the action of the second spring 43, the top block 44 disengages from the inclined surface of the ring block 34, the first spring 32 re-applies to the sealing ring 31, making it press the end face of the sealing ring 20 again, restoring the static sealing state, and the overall seal is restored: the whole system returns to the initial sealing state and is ready for the next start.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A labyrinth-type sealed dustproof drive motor for industrial vehicles, characterized in that, include: The front end cover (1) located at the end of the motor body and the output shaft (2) passing through the middle of the front end cover (1) also include a dustproof component (3) covering the connection between the output shaft (2) and the front end cover (1); The dustproof component (3) includes: The cover body one (11) and cover body two (12) are detachable and can be fitted together. The cover body one (11) is located at one end near the front cover (1) and the cover body one (11) is sleeved with the front cover (1). A sealing ring (20) is fixedly sleeved on the output shaft (2). The cover body one (11) and the cover body two (12) are covered on the outside of the sealing ring (20), and there is a gap between their inner sidewalls and the sealing ring (20). A sealing assembly (30) is provided on the inner side of the opposite end of the cover body one (11) and the cover body two (12), and a driving assembly (40) is provided on the outer wall of the sealing ring (20) near the sealing assembly (30); The sealing assembly (30) includes a sealing ring (31) that is elastically movable along the output shaft (2); When the output shaft (2) is stationary, the sealing ring (31) abuts against the end of the sealing ring (20), and the gap between the mating surfaces of the sealing cover one (11), cover two (12) and the sealing ring (20); When the output shaft (2) is rotating, the drive assembly (40) drives the sealing ring (31) away from the end of the sealing ring (20).

2. The labyrinth-type sealed dustproof drive motor for industrial vehicles according to claim 1, characterized in that, The sealing assembly (30) also includes a spring (32) that connects the sealing ring (31) to the inner wall of the corresponding cover.

3. The labyrinth-type sealed dustproof drive motor for industrial vehicles according to claim 2, characterized in that, The drive assembly (40) includes: a plurality of fixed posts (41) spaced apart circumferentially along the sealing ring (20), the fixed posts (41) extending radially, a sleeve block (42) slidably sleeved on the outside of the fixed posts (41), wherein a spring two (43) is sleeved on the outside of the fixed posts (41) and located between the sleeve block (42) and the sealing ring (20), and a top block (44) is provided at one end of the sleeve block (42) near the sealing ring (31); The sealing ring (31) is provided with a connecting rod (33) at one end away from the output shaft (2), and a ring block (34) is provided at the other end of the connecting rod (33). The ring block (34) is movably arranged along the axial direction of the output shaft (2), and the end faces of the top block (44) and the ring block (34) that are close to each other are both set as inclined surfaces. When the output shaft (2) rotates, under the action of centrifugal force, the sleeve block (42) slides along the fixed column (41) to the side away from the sealing ring (20), causing the inclined end of the top block (44) to abut against the inclined end of the ring block (34), so that the ring block (34) drives the sealing ring (31) away from the sealing ring (20) through the connecting rod (33).

4. The labyrinth-type sealed dustproof drive motor for industrial vehicles according to claim 3, characterized in that, It also includes a guide rod (35) arranged axially along the output shaft (2), the guide rod (35) passing through the connecting rod (33), and the two are slidably engaged.

5. The labyrinth-type sealed dustproof drive motor for industrial vehicles according to claim 1, characterized in that, The front cover (1) has multiple protruding rings (101) with different diameters and lengths on its end face near the cover body (11). The cover body (11) has grooves (110) for the protruding rings (101) to be inserted into.

6. The labyrinth-type sealed dustproof drive motor for industrial vehicles according to claim 1, characterized in that, Both the first cover (11) and the second cover (12) are provided with a connecting part (13) at their respective ends, and the connecting part (13) is connected by a bolt.

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