Die-cast aluminum alloy plastic-coated swing arm inner bushing

Abstract

The utility model discloses a kind of die-casting aluminum alloy plastic-coated swing arm inner bushings, including inner sleeve body, one end of inner sleeve body length direction is connecting end, the other end of inner sleeve body length direction is mounting end, the inside of inner sleeve body is provided with mounting hole, mounting hole is along the axial direction of inner sleeve body and is penetrated from mounting end to connecting end, mounting hole is abutting section between mounting end and connecting end, mounting hole is outwardly recessed and forms first weight-reducing groove along the horizontal direction of inner sleeve body in abutting section, the outside of inner sleeve body is formed with plastic-coated surface, the plastic-coated surface is formed by inward recessing from the outer surface of inner sleeve body, plastic-coated ring is formed at mounting end position in the plastic-coated surface, and the plastic-coated ring is convex to the surface of plastic-coated surface in circumferential direction. The connecting performance between aluminum alloy and rubber layer is increased by plastic-coated layer, and the weight of plastic-coated layer is lighter than metal, which plays a weight-reducing effect, and first weight-reducing groove and second weight-reducing groove play a weight-reducing effect.

Description

Technical Field

[0001] This utility model relates to automotive die-casting parts, and in particular to a die-cast aluminum alloy plastic-coated swing arm bushing. Background Technology

[0002] The control arm of a car is related to its vibration damping, driving stability, and steering sensitivity. The control arm is connected to the axle through bushings. The bushings play a role in damping the vibration in the control arm. The bushing is usually made of an inner sleeve, an outer sleeve, and a rubber sleeve connecting the two. The outer sleeve is fixed by an interference fit with the mounting hole of the control arm. The bushings in the current technology are usually made of cast iron. Cast iron parts have high strength and good reliability, but they are heavy. Using cast iron bushings increases the weight of the whole vehicle.

[0003] Especially with the rise of new energy vehicles, weight has affected their range, so lightweighting is a development trend. In existing technologies, cast aluminum parts are gradually being used to replace cast iron inner sleeves. For example, in the invention patent with application number "201410110204.0", a plastic outer sleeve is used to solve the weight reduction problem. However, when the outer sleeve is connected to the swing arm with an interference fit, the plastic outer sleeve is prone to breakage. Therefore, a bushing structure that can reduce weight while ensuring strength is needed. Utility Model Content

[0004] The purpose of this invention is to provide a die-cast aluminum alloy plastic-coated swing arm bushing that, while ensuring strength, has the advantage of being lightweight through plastic coating and weight-reducing grooves.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a die-cast aluminum alloy plastic-coated swing arm inner bushing, comprising an inner sleeve body, one end of the inner sleeve body along its length direction being a connecting end, and the other end of the inner sleeve body along its length direction being an mounting end. An mounting hole is provided inside the inner sleeve body, the mounting hole extending axially from the mounting end to the connecting end along the inner sleeve body. The mounting hole forms an abutment section between the mounting end and the connecting end. In the abutment section, the mounting hole is recessed outward along the horizontal direction of the inner sleeve body to form a first weight-reducing groove. The mounting hole extends axially from the connecting end along the inner sleeve body... The first weight-reducing groove is formed by a horizontal outward indentation. The first weight-reducing groove is located within the orthographic projection range of the second weight-reducing groove. Each of the abutting sections is located between adjacent first weight-reducing grooves. The abutting section extends along the length direction of the inner sleeve towards the connecting end to form a structural reinforcement section. Each of the structural reinforcement sections is located between adjacent second weight-reducing grooves. A plastic-coated surface is formed on the outer side of the inner sleeve. The plastic-coated surface is formed by an inward indentation from the outer surface of the inner sleeve. A plastic-coated ring is formed at the mounting end position of the plastic-coated surface. The plastic-coated ring protrudes from the surface of the plastic-coated surface in the circumferential direction.

[0006] Preferably, the cross-sectional shape of the mounting end is circular, the cross-sectional shape of the mounting hole at the mounting end is circular, the mounting hole has a mounting groove on the surface of the mounting end, the mounting groove is symmetrically arranged on both sides of the width of the mounting hole, and the mounting groove is recessed downward along the side wall of the mounting hole.

[0007] By adopting the above technical solution, the circular mounting end is fixed to the swing arm, while the circular mounting hole allows the connecting bolt to pass through, and the mounting groove cooperates with the protrusion on the swing arm to play a role in limiting and fixing.

[0008] Preferably, the top of the first weight-reducing groove is on the same plane as the bottom of the mounting groove, and the cross-section of the mounting groove is semi-circular.

[0009] By adopting the above technical solution, plane alignment ensures the uniformity of stress distribution and reduces stress concentration. The semi-circular weight-reducing groove has a better weight-reduction effect. At the same time, the installation groove also serves to allow tools to enter and facilitate the removal of connecting bolts.

[0010] Preferably, the inner surface of the abutting section is arc-shaped, the inner surface of the abutting section is flush with the inner surface of the mounting hole, the connection position of the abutting section and the first weight-reducing groove is arc-shaped, and the sum of the inner angles occupied by the abutting section is less than 300 degrees.

[0011] By adopting the above technical solution, the arc-shaped abutment section plays a role in cooperating with the side of the bolt, and the first weight-reducing groove is set between the abutment sections to reduce the weight of the cast aluminum inner bushing, while ensuring sufficient contact area.

[0012] Preferably, the connection between the bottom of the structural reinforcement section and the top of the abutment section is inclined, and the side of the structural reinforcement section is rounded.

[0013] By adopting the above technical solution, a guiding function is provided to facilitate the installation of bolts, while reducing stress concentration and scratches.

[0014] Preferably, the connecting end has a first marking groove and a second marking groove recessed therein. The cross-sectional shape of the first marking groove and the second marking groove is semi-circular. The first marking groove is located in the middle of the horizontal direction of the structural reinforcement section, and the second marking groove is located on the side opposite to the structural reinforcement section. The first marking groove and the second marking groove are recessed to the inclined transition position along the length direction of the inner sleeve.

[0015] By adopting the above technical solution, the first and second marking slots not only reduce the overall weight, but also help to align the direction during installation, thus avoiding misalignment of the installation angle.

[0016] Preferably, the first weight-reducing groove has a triangular cross-section, and there are four of each of the first weight-reducing groove and the abutting section. The adjacent abutting sections are set at the position of the first weight-reducing groove to form a narrow opening. The outer contour of the second weight-reducing groove is fan-shaped, and the number of the second weight-reducing groove and the structural reinforcing section is four.

[0017] By adopting the above technical solution, excess material is reduced, internal stress concentration is avoided, the load distribution is more uniform, and the constriction setting improves the connection effect at this position, ensuring the connection performance of the bushing.

[0018] Preferably, the plastic-coated surface has a rectangular cross-sectional shape with rounded corners at the contact section, the mounting hole has a cylindrical surface on the outer side of the mounting end, one end of the plastic-coated surface in the length direction is connected to the plastic-coated ring, and a first inclined connecting section is provided at the contact position between the plastic-coated surface and the cylindrical surface. There are four first inclined connecting sections, one end of the first inclined connecting section is connected to the rounded corner, and the other end of the first inclined connecting section is connected to the plastic-coated ring.

[0019] By adopting the above technical solution, the structural strength is enhanced, the uniformity of the plastic coating layer is improved, the connection of the outer rubber layer is facilitated, and the connection performance between the plastic coating layer and the plastic coating ring is enhanced.

[0020] Preferably, the plastic-coated surface is rectangular near the first marking groove at the connecting end, and the cross-sectional shape of the plastic-coated surface is semi-circular near the second marking groove at the connecting end. The plastic-coated surface has second inclined connecting sections evenly distributed at the positions where it mates with the connecting end.

[0021] By adopting the above technical solution, the connection effect is improved, and the plastic coating layer is prevented from falling off at this location.

[0022] Preferably, the outer side of the plastic-coated surface is provided with a plastic coating layer, the plastic coating layer is provided with protrusions at the mounting end and the connecting end, the protrusion at the mounting end is provided with a weight reduction hole, the protrusion at the connecting end is lower than the upper surface of the connecting end, and the middle section of the plastic coating layer is thinner than the protrusions.

[0023] By adopting the above technical solution, the protrusion firstly increases the contact area with the subsequent rubber layer, and at the same time restricts the subsequent axial movement of the rubber layer, so that the rubber is fixed in the middle position. The weight reduction hole also plays a role in weight reduction.

[0024] In summary, the inner bushing is made of aluminum alloy to reduce weight. A plastic coating layer is provided on the outer surface of the inner bushing, and a rubber layer is placed between the plastic coating layer and the outer bushing, connecting to the swing arm and serving to connect and reduce vibration. The plastic coating layer increases the connection performance between the aluminum alloy and the rubber layer. Simultaneously, the plastic coating layer is lighter than metal, achieving a weight reduction effect. The plastic coating surface facilitates the application of plastic coating to the inner bushing surface, and the plastic coating ring prevents detachment after coating. The first and second weight-reducing grooves reduce weight while ensuring the structural strength of the inner bushing. The abutment section between adjacent first weight-reducing grooves contacts the side of the bolt, serving a fixing and limiting function. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of an embodiment; Figure 2 This is a schematic diagram of the connection end in an embodiment; Figure 3 This is a schematic diagram of the installation end in an embodiment; Figure 4 This is a schematic diagram of the installation end after plastic coating in the embodiment; Figure 5 This is a cross-sectional schematic diagram of the plastic coating layer after plastic coating in the embodiment; In the figure, 1. Inner sleeve; 11. Connecting end; 12. First marking groove; 13. Second marking groove; 14. Mounting end; 15. Mounting hole; 16. Mounting groove; 2. Abutting section; 21. First weight-reducing groove; 3. Structural reinforcement section; 31. Second weight-reducing groove; 4. Plastic-coated surface; 41. Plastic-coated ring; 42. Rounded corner; 43. Cylindrical surface; 44. First inclined connecting section; 45. Second inclined connecting section; 5. Plastic-coated layer; 51. Protrusion; 52. Weight-reducing hole. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0028] Example: like Figures 1 to 5As shown, a die-cast aluminum alloy plastic-coated swing arm bushing has an inner sleeve body 1 made entirely of die-cast aluminum alloy, which has a light weight and good structural strength. One end of the inner sleeve body 1 along its length is a connecting end 11 for bolt insertion, and the other end is a mounting end 14. The mounting end 14 is located at the other end of the inner sleeve body 1 along its length. The inner sleeve body 1 has a mounting hole 15 for bolts to pass through. The mounting hole 15 extends along the axial direction of the inner sleeve body 1 from the mounting end 14 to the connecting end 11. Between the mounting end 14 and the connecting end 11, there is an abutment section 2. The inner surface of the abutment section 2 is arc-shaped and is used to mate with the bolt. The mounting hole 15 is recessed outward along the horizontal direction of the inner sleeve 1 in the abutment section 2 to form a first weight-reducing groove 21. The cross-section of the first weight-reducing groove 21 is triangular. The connection position between the abutment section 2 and the first weight-reducing groove 21 is arc-shaped. The sum of the interior angles occupied by the abutment section 2 is less than 300 degrees. There are four of each of the first weight-reducing groove 21 and the abutment section 2. The first weight-reducing groove 21 reduces the weight of the inner sleeve 1. The adjacent abutment sections 2 are set at the position of the first weight-reducing groove 21 to strengthen the structural strength of the position of the first weight-reducing groove 21. The top of the first weight-reducing groove 21 is on the same plane as the bottom of the mounting groove 16. The cross-section of the mounting groove 16 is semi-circular.

[0029] like Figure 2 As shown, above the first weight-reducing groove 21, the mounting hole 15 is recessed outward along the horizontal direction of the inner sleeve 1 at the connecting end 11 to form a second weight-reducing groove 31. The outer contour of the second weight-reducing groove 31 is fan-shaped. There are four second weight-reducing grooves 31 and four structural reinforcing sections 3. The first weight-reducing groove 21 is located within the orthographic projection range of the second weight-reducing groove 31. Each abutting section 2 is located between adjacent first weight-reducing grooves 21. The abutting section 2 extends along the length direction of the inner sleeve 1 towards the connecting end 11 to form a structural reinforcing section 3. The connection position between the bottom of the structural reinforcing section 3 and the top of the abutting section 2 is inclined. The side of the structural reinforcing section 3 is rounded. Each structural reinforcing section 3 is located between adjacent second weight-reducing grooves 31. Under the premise of ensuring the structural strength of the inner sleeve, the weight reduction effect is maximized.

[0030] like Figure 1 and Figure 4 As shown, a plastic-coated surface 4 is formed on the outer side of the inner sleeve 1. The plastic-coated surface 4 mainly serves to connect with the plastic coating layer 5, thereby reducing weight and improving the connection effect with the rubber. The plastic-coated surface 4 is formed by an inward indentation from the outer surface of the inner sleeve 1. A plastic-coated ring 41 is formed at the mounting end 14 of the plastic-coated surface 4. The plastic-coated ring 41 protrudes from the surface of the plastic-coated surface 4 in the circumferential direction, as shown. Figure 5 As shown, the plastic-coated ring 41 serves as a limiting element at the end of the plastic-coated layer 5.

[0031] like Figures 1 to 5As shown, the overall structure of the mounting end 14 is as follows: the cross-sectional shape of the mounting end 14 is circular; the cross-sectional shape of the mounting hole 15 at the mounting end 14 is also circular; a mounting groove 16 is provided on the surface of the mounting end 14; the mounting groove 16 is symmetrically arranged on both sides of the width of the mounting hole 15; the mounting groove 16 is used to strengthen the fixing effect and facilitate the subsequent disassembly of the inner bushing and bolts; the mounting groove 16 is recessed downward along the side wall of the mounting hole 15; as Figure 3 As shown, the inner surface of the abutment section 2 is flush with the inner surface of the mounting hole 15.

[0032] like Figure 2 As shown, to avoid problems with the installation angle of the inner sleeve, it is marked by marking grooves. Specifically, the connecting end 11 has a first marking groove 12 and a second marking groove 13 recessed. The cross-sectional shape of the first marking groove 12 and the second marking groove 13 is semi-circular. The first marking groove 12 is located in the middle of the horizontal direction of the structural reinforcement section 3, and the second marking groove 13 is located on the side opposite to the structural reinforcement section 3. The first marking groove 12 and the second marking groove 13 are recessed along the length direction of the inner sleeve 1 to the inclined transition position.

[0033] like Figures 1 to 5 As shown, the outline shape of the plastic-coated surface 4 is as follows: the cross-sectional shape of the plastic-coated surface 4 at the abutment section 2 is rectangular and has rounded corners 42; the mounting hole 15 has a cylindrical surface 43 on the outside of the mounting end 14; one end of the plastic-coated surface 4 in the length direction is connected to the plastic-coated ring 41; a first inclined connecting section 44 is provided at the contact position between the plastic-coated surface 4 and the cylindrical surface 43; four first inclined connecting sections 44 are provided; one end of the first inclined connecting section 44 is connected to the rounded corner 42; the other end of the first inclined connecting section 44 is connected to the plastic-coated ring 41; the plastic-coated surface 4 is rectangular at the position of the connecting end 11 near the first marking groove 12; the cross-sectional shape of the plastic-coated surface 4 is semi-circular at the position of the connecting end 11 near the second marking groove 13; and second inclined connecting sections 45 are evenly distributed at the position of the plastic-coated surface 4 that mate with the connecting end 11.

[0034] like Figure 5 As shown, a plastic coating layer 5 is provided on the outer side of the plastic coating surface 4. The inner side of the plastic coating layer 5 is connected to the plastic coating surface 4 of the aluminum alloy. The outer side of the plastic coating layer 5 is connected to the buffer rubber. The plastic coating layer 5 has a protrusion 51 at the mounting end 14 and the connecting end 11. A weight reduction hole 52 is provided in the protrusion 51 of the mounting end 14. Under the premise of ensuring structural strength, the weight reduction hole 52 plays the role of reducing weight. The protrusion 51 of the connecting end 11 is lower than the upper surface of the connecting end 11. The middle section of the plastic coating layer 5 is thinner than the protrusion 51.

[0035] Working principle: This inner bushing is mainly used in various automotive suspensions or swing arms, through which bolts pass for fastening. It mainly serves to absorb shock. Compared with traditional rubber coating, it forms a plastic coating layer 5 by wrapping plastic on the plastic coating surface 4, and then wrapping black rubber on the plastic coating layer 5 before installing it into the outer bushing. By processing a certain roughness on the surface of the plastic coating surface 4, the adhesion between the plastic material and the aluminum alloy inner bushing is ensured as much as possible during the plastic coating process, improving the connection effect and reducing the overall weight.

Claims

1. A die-cast aluminum alloy plastic-coated swing arm inner bushing, characterized in that: The device includes an inner sleeve (1), one end of which is a connecting end (11) along its length, and the other end of which is a mounting end (14) along its length. An mounting hole (15) is provided inside the inner sleeve (1). The mounting hole (15) extends from the mounting end (14) to the connecting end (11) along the axial direction of the inner sleeve (1). The mounting hole (15) forms an abutment section (2) between the mounting end (14) and the connecting end (11). The mounting hole (15) is recessed outward along the horizontal direction of the inner sleeve (1) in the abutment section (2) to form a first weight-reducing groove (21). The mounting hole (15) is also recessed outward along the horizontal direction of the inner sleeve (1) at the connecting end (11) to form a second weight-reducing groove. (31) The first weight-reducing groove (21) is located within the orthographic projection range of the second weight-reducing groove (31). Each of the abutting sections (2) is located between adjacent first weight-reducing grooves (21). The abutting section (2) extends along the length direction of the inner sleeve (1) toward the connecting end (11) to form a structural reinforcement section (3). Each of the structural reinforcement sections (3) is located between adjacent second weight-reducing grooves (31). A plastic-coated surface (4) is formed on the outer side of the inner sleeve (1). The plastic-coated surface (4) is formed by indentation from the outer surface of the inner sleeve (1). A plastic-coated ring (41) is formed at the mounting end (14) of the plastic-coated surface (4). The plastic-coated ring (41) protrudes from the surface of the plastic-coated surface (4) in the circumferential direction.

2. The die-cast aluminum alloy plastic-coated swing arm bushing according to claim 1, characterized in that: The cross-sectional shape of the mounting end (14) is circular, and the cross-sectional shape of the mounting hole (15) at the mounting end (14) is circular. The mounting hole (15) has a mounting groove (16) on the surface of the mounting end (14). The mounting groove (16) is symmetrically arranged on both sides of the width of the mounting hole (15). The mounting groove (16) is recessed downward along the side wall of the mounting hole (15).

3. The die-cast aluminum alloy plastic-coated swing arm bushing according to claim 2, characterized in that: The top of the first weight-reducing groove (21) is on the same plane as the bottom of the mounting groove (16), and the cross-section of the mounting groove (16) is semi-circular.

4. The die-cast aluminum alloy plastic-coated swing arm bushing according to claim 2, characterized in that: The inner surface of the abutting section (2) is arc-shaped, and the inner surface of the abutting section (2) is flush with the inner surface of the mounting hole (15). The connection position between the abutting section (2) and the first weight-reducing groove (21) is arc-shaped, and the sum of the inner angles occupied by the abutting section (2) is less than 300 degrees.

5. The die-cast aluminum alloy plastic-coated swing arm bushing according to claim 2, characterized in that: The connection between the bottom of the structural reinforcement section (3) and the top of the abutment section (2) is inclined, and the side of the structural reinforcement section (3) is rounded.

6. The die-cast aluminum alloy plastic-coated swing arm bushing according to claim 5, characterized in that: The connecting end (11) has a recessed first marking groove (12) and a second marking groove (13). The cross-sectional shape of the first marking groove (12) and the second marking groove (13) is semi-circular. The first marking groove (12) is located in the middle of the horizontal direction of the structural reinforcement section (3), and the second marking groove (13) is located on the side opposite to the structural reinforcement section (3). The first marking groove (12) and the second marking groove (13) are recessed along the length direction of the inner sleeve (1) to the inclined transition position.

7. The die-cast aluminum alloy plastic-coated swing arm bushing according to claim 6, characterized in that: The first weight-reducing groove (21) has a triangular cross-section. There are four of the first weight-reducing groove (21) and the abutting section (2). The adjacent abutting section (2) is set at the position of the first weight-reducing groove (21) in a constricted manner. The outer contour of the second weight-reducing groove (31) is fan-shaped. There are four of the second weight-reducing groove (31) and the structural reinforcement section (3).

8. The die-cast aluminum alloy plastic-coated swing arm bushing according to claim 7, characterized in that: The plastic-coated surface (4) has a rectangular cross-section at the abutment section (2) and is provided with rounded corners (42). The mounting hole (15) is provided with a cylindrical surface (43) on the outside of the mounting end (14). One end of the plastic-coated surface (4) in the length direction is connected to the plastic-coated ring (41). A first inclined connecting section (44) is provided at the contact position between the plastic-coated surface (4) and the cylindrical surface (43). There are four first inclined connecting sections (44). One end of the first inclined connecting section (44) is connected to the rounded corner (42), and the other end of the first inclined connecting section (44) is connected to the plastic-coated ring (41).

9. The die-cast aluminum alloy plastic-coated swing arm bushing according to claim 8, characterized in that: The plastic-coated surface (4) is rectangular near the first marking groove (12) at the connecting end (11), and the cross-sectional shape of the plastic-coated surface (4) near the second marking groove (13) at the connecting end (11) is semi-circular. The plastic-coated surface (4) has a second inclined connecting section (45) evenly distributed at the position where it mates with the connecting end (11).

10. The die-cast aluminum alloy plastic-coated swing arm bushing according to claim 9, characterized in that: A plastic coating layer (5) is provided on the outer side of the plastic coating surface (4). The plastic coating layer (5) has protrusions (51) at the mounting end (14) and the connecting end (11). A weight reduction hole (52) is provided in the protrusion (51) of the mounting end (14). The protrusion (51) of the connecting end (11) is lower than the upper surface of the connecting end (11). The middle section of the plastic coating layer (5) is thinner than the protrusion (51).

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