Axial centering device for rear axle housing

Abstract

The invention belongs to the technical field of rear axle housing machining, and discloses a rear axle housing axial centering device which comprises a supporting seat connected with a base body, a first oil cylinder, a first rack, a first shaft, a first gear, a second gear, a second rack and a guide seat. The fixed end of the second oil cylinder is fixedly connected with the guide seat, the output end of the second oil cylinder faces the rear axle housing and is fixedly connected with a guide groove body with an isosceles triangle section, the bottom edge of the guide groove body is close to the rear axle housing, and the vertex angle is fixedly connected with the output end of the second oil cylinder; two waists of the guide groove body are respectively provided with a push rod; one ends of the push rods on the two waists are attached to the guide groove body, and the other ends extend out of the guide seat; limiting grooves are formed between the two push rods and the guide base, and the two push rods are arranged in the axial direction of the rear axle housing. By arranging the guide groove body with the section being of the isosceles triangle structure and the push rod structure, the lute hole of the rear axle housing is axially centered, and it can be guaranteed that the centered guide groove body is located at the center line of the lute hole.

Description

Technical Field

[0001] The present invention relates to the technical field of rear axle housing processing, and particularly relates to an axial centering device for a rear axle housing. Background Art

[0002] For the processing of the pipa holes of the rear axle housing, during processing, the rear axle housing is fixed, and the processing of the pipa holes is achieved through the rotational movement of the cutting tool. This requires that before processing, the initial pipa holes and the axis of the cutting tool are coaxial. The conventional method of making the pipa holes and the axis of the cutting tool coaxial is indirectly achieved by positioning the axle end of the rear axle housing. However, the distance deviation between the axle end and the pipa holes is relatively large, resulting in uneven machining allowance during the processing of the pipa holes, vibrations, cutting tool chipping, etc. Seriously, there may be insufficient allowance for the pipa holes, causing the rear axle housing to be scrapped.

[0003] As Figure 1 and Figure 2 shown, the overall structure of the rear axle housing is a hollow cylindrical shape in the middle, and extension ends extend from the center of the cylinder to both ends in the direction of the cylinder diameter. The center of the cylinder of the rear axle housing is initially rough machined, and then circular thin plates are welded to both ends of the center of the cylinder. The through holes in the middle of the circular thin plates are the pipa holes, and the end of the circular thin plate away from the center of the cylinder of the rear axle housing is the reference plane. The dimensional markings of the rear axle housing are generally marked from the pipa holes to the end faces. At the same time, in order to reduce the transmission system of the machine tool during processing, when the pipa holes are finish machined after welding, the main shaft feed for boring the pipa holes only completes the depth direction. Therefore, the axis of the cutting tool at the initial position where it extends into the pipa holes needs to be coaxial with the axis of the pipa holes. Summary of the Invention

[0004] In order to solve the problem of large deviation between the axis of the cutting tool for traditional rear axle housing processing and the pipa holes of the rear axle housing in the above-mentioned prior art, the present invention proposes an axial centering device for a rear axle housing, aiming to streamline the positioning mechanism of the rear axle housing and enable it to accurately perform axial centering.

[0005] The present invention is achieved through the following technical solutions: It includes a support base, which is connected to the base body. It also includes a first oil cylinder with its output end horizontally arranged and perpendicular to the axial direction of the rear axle housing, a first rack fixedly connected to the output end of the first oil cylinder and parallel to it, a first shaft arranged parallel to the axial direction of the rear axle housing, a first gear sleeved on the first shaft and fixedly connected and meshing with the first rack, a second gear sleeved on the first shaft and fixedly connected, a second rack arranged vertically and meshing with the second gear, and a guide seat fixedly connected to the end of the second rack close to the rear axle housing; the first oil cylinder is arranged at a position far from the rear axle housing, and the fixed end of the first oil cylinder is fixedly connected to the support base; both ends of the first shaft are respectively connected to the support base through bearings, a second oil cylinder is arranged above the middle of the guide seat, the fixed end of the second oil cylinder is fixedly connected to the guide seat, the output end of the second oil cylinder faces the rear axle housing and is fixedly connected with a guide groove body with an isosceles triangle cross-section, the bottom edge of the guide groove body is arranged close to the rear axle housing, and the vertex angle is fixedly connected to the output end of the second oil cylinder; push rods are respectively arranged on two waists of the guide groove body; one ends of the push rods on the two waists are in contact with the guide groove body, and the other ends extend out of the guide seat; limiting grooves are arranged between the two push rods and the guide seat, and the two push rods are arranged along the axial direction of the rear axle housing.

[0006] As a further preference, a linear guide rail is arranged between the support base and the base body. The guide rail of the linear guide rail is arranged on the base body and fixedly connected to the base body, and the slider of the linear guide rail is fixedly connected to the support base; the linear guide rail is horizontally arranged and perpendicular to the axial direction of the rear axle housing.

[0007] As a further preference, a first adjusting bolt is arranged on the support base at the end of the first rack far from the first oil cylinder; the first adjusting bolt is collinear with the first rack and is fixedly connected to the support base through threads.

[0008] As a further preference, the vertex angle of the guide groove body and the output end of the second oil cylinder are fixedly connected through a second connecting screw.

[0009] As a further preference, the first rack is fixedly connected to the output end of the first oil cylinder through a first connecting screw.

[0010] As a further preference, there are two groups of the second gear and the second rack. The two groups of the second gear and the second rack are respectively arranged on both sides of the first gear and are symmetrically arranged with respect to the second oil cylinder.

[0011] As a further preference, a magnetic material is arranged on the contact surface between the push rod and the guide groove body.

[0012] As a further preference, the first oil cylinder is a double-rod oil cylinder.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. By providing a guide groove body and a push rod structure with an isosceles triangle cross-section structure, the present invention axially centers the pipa hole of the rear axle housing, ensuring that the centered guide groove body is located at the center line of the pipa hole. Thus, it can be ensured that after the subsequent tool enters the pipa hole, the axis of the tool is collinear with the axis of the pipa hole.

[0015] 2. The present invention provides a linear guide rail and corresponding structures, which can convey the axial centering mechanism to a specified position, thereby ensuring the smooth progress of subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the rear axle housing.

[0017] Figure 2 is a partial sectional view of the pipa hole of the rear axle housing.

[0018] Figure 3 is an enlarged overall structural view of the axial centering device of the present invention.

[0019] Figure 4 is Figure 3 the sectional view taken along line A-A of

[0020] Figure 5 is a partial enlarged schematic view of the axial centering device of the present invention extending into the pipa hole of the rear axle housing.

[0021] Reference numerals in the figures:

[0022] 1, support seat; 2, first oil cylinder; 3, first connecting screw; 4, first rack; 5, first adjusting bolt; 6, first shaft; 7, second gear; 8, first gear; 9, second rack; 10, second oil cylinder; 11, guide seat; 12, second connecting screw; 13, guide groove body; 14, push rod; 15, linear guide rail. DETAILED DESCRIPTION OF THE INVENTION

[0023] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given only by way of example with reference to the accompanying drawings.

[0024] As Figure 1 and Figure 2As shown in the figure, the overall structure of the rear axle housing is a hollow cylindrical shape in the middle, and extension ends extend from both ends of the cylinder center in the direction of the cylinder diameter. The cylinder center of the rear axle housing is initially rough machined, and then circular thin plates are welded to both ends of the cylinder center. The through hole in the middle of the circular thin plate is the pipa hole, and the end of the circular thin plate away from the cylinder center of the rear axle housing is the leveling surface. The dimension marking of the rear axle housing is generally marked from the pipa hole to the end face. At the same time, in order to reduce the transmission system of the machine tool during processing, when the pipa hole is finish machined after welding, the spindle feed for boring the pipa hole only completes the depth direction. Therefore, the tool axis at the initial position where the tool extends into the pipa hole needs to be coaxial with the axis of the pipa hole. The present invention designs an axial centering mechanism that can ensure that the initial extending axis of the machining tool is coaxial with the axis of the pipa hole.

[0025] In the present invention, the axial direction of the rear axle housing is along the direction of the two extension ends of the rear axle housing, and the direction perpendicular to the axial direction of the rear axle housing is the transverse direction of the rear axle housing. The transverse direction of the rear axle housing is collinear with one of the diameters of the cylindrical part of the rear axle housing.

[0026] As Figure 3 and Figure 5 As shown in the figure, the present invention provides an axial centering device for a rear axle housing, including a support seat 1. The support seat 1 is connected to the base body, and the base body can be one of the ground, a wall, or the base of a machine tool. To facilitate the sliding of the support seat 1 on the base body, a linear guide rail 15 is provided between the support seat 1 and the base body. The guide rail of the linear guide rail 15 is arranged on the base body and fixedly connected to the base body, and the slider of the linear guide rail 15 is fixedly connected to the support seat 1. The linear guide rail 15 is horizontal and perpendicular to the axial direction of the rear axle housing.

[0027] When axial centering of the rear axle housing is required, the slider of the linear guide rail 15 slides towards the rear axle housing, driving the support seat 1 to slide towards the rear axle housing. When the movement is in place, the axial centering device starts to work to perform axial centering on the rear axle housing. After the axial centering work is completed, the slider of the linear guide rail 15 slides in the direction away from the rear axle housing, driving the support seat 1 to move away from the rear axle housing to avoid the tool, and the tool extends into the rear axle housing to process the pipa hole.

[0028] The axial centering device of the rear axle housing further includes a first oil cylinder 2. The first oil cylinder 2 is a double-rod oil cylinder, and the output ends of the first oil cylinder 2 are horizontally arranged and perpendicular to the axis of the rear axle housing at the same time. The first oil cylinder 2 is arranged at a position far from the rear axle housing, and the fixed end of the first oil cylinder 2 is fixedly connected to the support seat 1. A first rack 4 is fixedly connected to the output end of the first oil cylinder 2 on the side close to the rear axle housing. The first rack 4 is preferably fixedly connected to the output end of the first oil cylinder 2 through a first connecting screw 3. The first rack 4 is parallel to the output end of the first oil cylinder 2, that is, the first rack 4 is horizontally arranged and perpendicular to the axis of the rear axle housing. The axial centering mechanism 7 further includes a first shaft 6. The first shaft 6 is arranged parallel to the axis of the rear axle housing. A first gear 8 is sleeved on the first shaft 6. The first gear 8 is fixedly connected to the first shaft 6. The first gear 8 is arranged below the first rack 4 and meshes with the first rack 4. Both ends of the first shaft 6 are respectively connected to the support seat 1 through bearings. A second gear 7 is also sleeved on the first shaft 6. The second gear 7 is fixedly connected to the first shaft 6. A second rack 9 meshes with the second gear 7. The second rack 9 is vertically arranged, that is, perpendicular to the horizontal plane. A guide seat 11 is fixedly connected to one end of the second rack 9 close to the rear axle housing. A second oil cylinder 10 is arranged above the middle of the guide seat 11. The fixed end of the second oil cylinder 10 is fixedly connected to the guide seat 11. The output end of the second oil cylinder 10 faces the rear axle housing and is fixedly connected to a guide groove body 13. The cross-section of the guide groove body 13 is an isosceles triangle. The bottom edge of the guide groove body 13 is arranged close to the rear axle housing. The top angle of the guide groove body 13 is fixedly connected to the output end of the second oil cylinder 10 through a second connecting screw 12. In order to make the up and down movement of the guide seat 11 smoother, two sets of second gears 7 and second racks 9 can be arranged. The two sets of second gears 7 and second racks 9 are respectively arranged on both sides of the first gear 8 and are symmetrically arranged with respect to the second oil cylinder 10. Push rods 14 are respectively arranged on the two waists of the guide groove body 13. One ends of the push rods 14 on the two waists are attached to the guide groove body 13, and the other ends extend out of the guide seat 11. Limit grooves are arranged between the two push rods 14 and the guide seat 11, and the two push rods 14 are arranged along the axis of the rear axle housing. The two push rods 14 are exactly the same in size. The retraction of the output end of the second oil cylinder 10 can control the upward movement of the guide groove body 13, that is, move towards the second oil cylinder 10. At this time, the two push rods 14 slide along the two waists of the guide groove body 13 and gradually extend out of the guide seat 11. When one side of the push rod 14 touches the wall of the pipa hole of the rear axle housing, the push rod 14 on this side will push the rear axle housing to move axially until the push rod 14 on the other side touches the wall of the pipa hole of the rear axle housing. At this time, the axial centering of the rear axle housing is completed.In order to enable the output end of the second oil cylinder 10 to extend, the two push rods 14 can be retracted into the guide seat 11 along the two waists of the guide groove body 13. Magnetic materials can be provided on the contact surfaces between the push rods 14 and the guide groove body 13 so that the push rods 14 always fit against the waist surfaces of the guide groove body 13. In order to ensure that the guide seat 11 can accurately extend into the pipa hole of the rear axle housing, a first adjusting bolt 5 can be provided on the support seat 1 at the end of the first rack 4 away from the first oil cylinder 2. The first adjusting bolt 5 is collinear with the first rack 4 and is fixedly connected to the support seat 1 by means of a thread. By providing the first adjusting bolt 5, the stroke of the first rack 4 can be controlled, thereby controlling the depth to which the guide seat 11 extends into the pipa hole of the rear axle housing.

[0029] The working principle of the present invention: First, the linear guide rail 15 slides towards the rear axle housing, driving the support seat 1 to move towards the rear axle housing until it reaches the center of the rear axle housing; Then, the output end of the first oil cylinder 2 extends, successively driving the first gear 8, the first shaft 6, the second gear 7 and the second rack 9 to move. The second rack 9 moves towards the rear axle housing, thereby moving the guide seat 11 into the pipa hole of the rear axle housing; Next, the output end of the second oil cylinder 10 retracts, the guide groove body 13 moves upward, and the two push rods 14 move outward from the guide seat 11 under the drive of the guide groove body 13. When one of the push rods 14 touches the pipa hole wall of the rear axle housing, this push rod 14 will push the rear axle housing to move axially until the other push rod 14 touches the pipa hole wall of the rear axle housing. At this time, the axial centering of the rear axle housing is completed; Subsequently, the output end of the second oil cylinder 10 extends, the guide groove body 13 moves downward, and the two push rods 14 move into the guide seat 11 under the drive of the guide groove body 13; The output end of the first oil cylinder 2 retracts, successively driving the first gear 8, the first shaft 6, the second gear 7 and the second rack 9 to move. The second rack 9 moves away from the rear axle housing, and the guide seat 11 moves out of the pipa hole of the rear axle housing; Finally, the slider of the linear guide rail 15 slides in the direction away from the rear axle housing, driving the support seat 1 to move away from the rear axle housing to avoid the tool, and the tool extends into the pipa hole of the rear axle housing for subsequent finish machining.

[0030] In addition to the above embodiments, the present invention can also have other implementation manners. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. An axial centering device for a rear axle housing, comprising a support seat (1), and the support seat (1) is connected to a base body, characterized in that: It further includes a first oil cylinder (2) with its output end horizontally arranged and perpendicular to the axial direction of the rear axle housing, a first rack (4) fixedly connected to the output end of the first oil cylinder (2) and parallel to it, a first shaft (6) arranged parallel to the axial direction of the rear axle housing, a first gear (8) sleeved on the first shaft (6) and fixedly connected and meshing with the first rack (4), a second gear (7) sleeved on the first shaft (6) and fixedly connected, a second rack (9) vertically arranged and meshing with the second gear (7), and a guide seat (11) fixedly connected to one end of the second rack (9) close to the rear axle housing; the first oil cylinder (2) is arranged at a position far from the rear axle housing, and the fixed end of the first oil cylinder (2) is fixedly connected to the support seat (1); both ends of the first shaft (6) are respectively connected to the support seat (1) through bearings, a second oil cylinder (10) is arranged above the middle of the guide seat (11), the fixed end of the second oil cylinder (10) is fixedly connected to the guide seat (11), the output end of the second oil cylinder (10) faces the rear axle housing and is fixedly connected with a guide groove body (13) with an isosceles triangle cross-section, the bottom edge of the guide groove body (13) is arranged close to the rear axle housing, and the vertex angle is fixedly connected to the output end of the second oil cylinder (10); push rods (14) are respectively arranged on the two waists of the guide groove body (13); one ends of the push rods (14) on the two waists are in contact with the guide groove body (13), and the other ends extend out of the guide seat (11); limiting grooves are arranged between the two push rods (14) and the guide seat (11), and the two push rods (14) are arranged along the axial direction of the rear axle housing.

2. The axial centering device for the rear axle housing according to claim 1, characterized in that: A linear guide rail (15) is arranged between the support seat (1) and the base body, the guide rail of the linear guide rail (15) is arranged on the base body and fixedly connected to the base body, and the slider of the linear guide rail (15) is fixedly connected to the support seat (1); the linear guide rail (15) is horizontally arranged and perpendicular to the axial direction of the rear axle housing.

3. The axle housing axial centering device according to claim 1, characterized in that: A first adjusting bolt (5) is arranged on the support seat (1) at one end of the first rack (4) far from the first oil cylinder (2); the first adjusting bolt (5) is collinear with the first rack (4) and is fixedly connected to the support seat (1) through threads.

4. The axial centering device for the rear axle housing according to claim 1, characterized in that: The vertex angle of the guide groove body (13) is fixedly connected to the output end of the second oil cylinder (10) through a second connecting screw (12).

5. The axial centering device for the rear axle housing according to claim 1, characterized in that: The first rack (4) is fixedly connected to the output end of the first oil cylinder (2) through a first connecting screw (3).

6. The axial centering device for the rear axle housing according to claim 1, wherein: There are two groups of the second gear (7) and the second rack (9), and the two groups of the second gear (7) and the second rack (9) are respectively arranged on both sides of the first gear (8) and are symmetrically arranged relative to the second oil cylinder (10).

7. The axial centering device for the rear axle housing according to claim 1, characterized in that: The contact surface between the push rod (14) and the guide groove body (13) is provided with a magnetic material.

8. The axial centering device for the rear axle housing according to any one of claims 1 to 7, characterized in that: The first oil cylinder (2) is a double-rod oil cylinder.

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