A die-casting part of a rear cradle of a mid-row motorcycle and a pouring structure of its die-casting mold

Abstract

The invention relates to the technical field of motorcycle die-casting production, and in particular to a mid-row motorcycle rear cradle die-casting and a die-casting mold runner structure thereof; through the optimization of the die-casting structure, in particular the A-shaped structure formed by a first frame rod, a second frame rod and a third frame rod, the die-casting has a very high structural strength when applied to a mid-row motorcycle for assembly; in the runner improvement design, in particular the second cross runner is improved, so that the second cross runner directly bypasses the first frame rod and is directly connected to the third frame rod, and an auxiliary runner is connected between the second cross runner and the first bottom end; this improvement makes the pouring solution flow state of the mid-row motorcycle die-casting, the entire cavity feed is balanced, the pouring solution is more evenly distributed, the defects such as shrinkage cavities, bubbles or incomplete filling are avoided inside the mid-row motorcycle die-casting, the density distribution of the die-casting is more even, and the overall structural strength of the die-casting and the stability of vehicle driving are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of motorcycle die-casting production, in particular to a mid-row motorcycle rear cradle die-casting and a die-casting mold runner structure. Background Art

[0002] For the manufacture of motorcycle rear cradles, common manufacturing processes include casting, forging and welding. Among them, the casting process can not only design the product to be lightweight, but also manufacture rear cradles with complex shapes. Compared with forging and welding, casting is simpler and more efficient. It only needs to design the corresponding mold and cast it by aluminum alloy casting. The mid-row motorcycle usually refers to a motorcycle with an engine displacement between 250cc and 500cc. In the prior art, the production process of the rear cradle of the mid-row motorcycle is mainly based on forging and welding, and the structure is thick. For example, the motorcycle rear cradle forging disclosed by the authorization announcement number CN204021129U, because the rear cradle of the mid-row motorcycle needs to be connected to the rear wheel, disc brake caliper, and engine, it needs to be used as a force point in multiple directions and bear a large force. Therefore, in order to ensure the structural stability of the motorcycle, the prior art still chooses forging and welding as the main manufacturing process of the rear cradle, because the casting process is inevitably prone to local pores, which affects the overall strength of the rear cradle of the mid-row motorcycle. Therefore, there is no precedent reported in the patent that the rear cradle of the mid-row motorcycle is produced by casting. Therefore, how to improve the runner structure shape of the mid-row motorcycle rear rocker frame die-casting, and design a corresponding runner system for the castable mid-row motorcycle rear rocker frame, so that the casting solution can be filled into the mold cavity more quickly and evenly to form the mid-row motorcycle rear rocker frame die-casting, and avoid the appearance of air holes inside the die-casting that affect the structural strength of the rear rocker frame, has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] The technical problem to be solved by the present invention is: how to improve the runner structure shape of the die-casting of the rear cradle of a mid-row motorcycle, and design the runner system for casting the rear cradle of a mid-row motorcycle accordingly, so that the pouring solution can be filled into the mold cavity more quickly and evenly to form the die-casting of the rear cradle of a mid-row motorcycle, avoiding the formation of air holes inside the die-casting and affecting the structural strength of the rear cradle.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A die-cast rear cradle for a mid-row motorcycle, comprising a rear cradle body, the rear cradle body being in an A-shape, the top end of the A-shape being formed by connecting a first frame rod and an X-direction end of a second frame rod, the other end of the first frame rod being a first bottom end, the other end of the second frame rod being a second bottom end, the other ends of the first frame rod and the second frame rod being connected by a third frame rod, the first bottom end of the A-shape being provided with a first engine mounting hole, the second bottom end of the A-shape being provided with a second engine mounting hole, the top end of the A-shape being provided with a first exhaust pipe mounting seat, the second engine mounting hole being located on the Y-direction side of the first engine mounting hole, and the first exhaust pipe mounting seat being located on the X-direction side of the first engine mounting hole; the middle portion of the first frame rod being provided with a second exhaust pipe mounting seat, and the middle portion of the second frame rod being provided with a third exhaust pipe mounting seat near the second bottom end;

[0006] An extension plate is extended toward the Y side between the second engine mounting hole of the second frame rod and the third exhaust pipe mounting seat, and a first oil pipe fixing hole and a second oil pipe fixing hole are provided on the extension plate, and the second oil pipe fixing hole is located in the X direction of the first oil pipe fixing hole;

[0007] A first disc brake caliper mounting hole and a second disc brake caliper mounting hole are also provided between the first exhaust pipe mounting seat and the third exhaust pipe mounting seat of the second bracket, wherein the second disc brake caliper mounting hole is located in the X direction of the first disc brake caliper mounting hole;

[0008] A recessed portion is provided at the top of the A-shape, a rear wheel mounting hole is provided in the recessed portion, and a shock absorber mounting hole is also provided in the recessed portion. The shock absorber mounting hole is located on the Y-direction side of the third exhaust pipe mounting seat.

[0009] Furthermore, in the die-cast structure of the rear cradle of the mid-row motorcycle, an ABS sensor mounting hole is also provided around the rear wheel mounting hole.

[0010] Furthermore, in the die-cast structure of the rear cradle of the mid-row motorcycle, the first exhaust pipe mounting seat, the second exhaust pipe mounting seat and the third exhaust pipe mounting seat have the same shape, which is a boss extending in the Z direction, and a connecting hole is provided on the boss.

[0011] The present invention also relates to a runner structure of a die-casting mold for a die-casting part of a rear cradle of a mid-row motorcycle, comprising a grouting hole column, the grouting hole column being located on the Y-direction opposite side of a rear cradle body, the axial direction of the grouting hole column being in the Z direction, the lower portion of the grouting hole column being connected with a straight runner, the lower portion of the straight runner being provided with a first cross runner facing the X-direction, the lower portion of the straight runner being provided with a second cross runner facing the X-direction opposite side, the end of the first cross runner being connected to the top of an A-shape, the second cross runner bypassing the first bottom end of the A-shape and connected to a third frame rod, an auxiliary runner being connected between the second cross runner and the first bottom end; the second cross runner being provided with a bent portion bent upward near the first bottom end, and two auxiliary runners being connected between the first frame rod and the second frame rod.

[0012] Furthermore, in the runner structure of the die-casting mold of the above-mentioned mid-row motorcycle rear cradle die-casting, more than one auxiliary runner is provided between the first cross runner and the first frame rod, and more than one auxiliary runner is connected between the second cross runner and the first frame rod; and multiple slag ladle runners are respectively connected to the Y-direction side of the rear cradle body.

[0013] Furthermore, in the runner structure of the die-casting mold of the above-mentioned mid-row motorcycle rear cradle die-casting, two slag ladle runners are respectively connected to the first oil pipe fixing hole and the second oil pipe fixing hole, one of the slag ladle runners is connected to the third exhaust pipe mounting seat, two of the slag ladle runners are respectively connected to the first disc brake caliper mounting hole and the second disc brake caliper mounting hole, and one of the slag ladle runners is connected to the shock absorber mounting hole.

[0014] Furthermore, in the runner structure of the die-casting mold of the die-casting component of the rear cradle of the mid-row motorcycle, a slag ladle runner is connected to the X direction of the first exhaust pipe mounting seat.

[0015] The beneficial effects of the present invention are as follows: through the optimization of the structure of the die-casting, especially the A-shaped structure formed by the first frame bar, the second frame bar and the third frame bar, the structure can have very high structural strength when applied to the mid-row motorcycle for assembly; in the runner improvement design, in particular, the second cross runner is improved, so that the second cross runner directly bypasses the first frame bar and is directly connected to the third frame bar, and an auxiliary runner is connected between the second cross runner and the first bottom end; the second cross runner is provided with a bending portion bending upward near the first bottom end, and this improvement makes the pouring solution flow state of the mid-row motorcycle die-casting, the entire cavity feeding is balanced, the pouring solution is more evenly distributed, and the defects such as shrinkage holes, bubbles or incomplete filling are avoided inside the mid-row motorcycle die-casting, and the density distribution of the die-casting is more uniform, which effectively improves the overall structural strength of the die-casting and the stability of vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a runner structure of a die-casting mold for a rear cradle die-casting part of a mid-row motorcycle according to a specific embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the runner structure of a die-casting mold for a rear cradle die-casting part of a mid-row motorcycle in the early stage of the research and development of the present invention;

[0018] Description of labels:

[0019] 1. Rear cradle body; 11. First frame rod; 12. Second frame rod; 13. Third frame rod; 14. First engine mounting hole; 15. Second engine mounting hole; 16. First exhaust pipe mounting seat; 17. Second exhaust pipe mounting seat; 18. Third exhaust pipe mounting seat; 19. Extension plate; 110. First oil pipe fixing hole; 111. Second oil pipe fixing hole; 112. First disc brake caliper mounting hole; 113. Second disc brake caliper mounting hole; 114. Concave portion; 115. Shock absorber mounting hole; 116. Rear wheel mounting hole; 117. ABS sensor mounting hole;

[0020] 2. Grouting holes and columns;

[0021] 3. Straight pouring channel;

[0022] 41. first horizontal runner; 42. second horizontal runner; 421. bending portion;

[0023] 5. Auxiliary pouring channel;

[0024] 6. Slag ladle pouring channel. DETAILED DESCRIPTION

[0025] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0026] Reference Figure 1 as well as Figure 2 The specific embodiment of the present invention relates to a die-casting of a rear cradle of a mid-row motorcycle, comprising a rear cradle body 1, wherein the rear cradle body 1 is in an A-shape, and is formed by connecting the X-direction ends of a first frame rod 11 and a second frame rod 12 to form an A-shaped top end, the other end of the first frame rod 11 is a first bottom end, and the other end of the second frame rod 12 is a second bottom end, and the other ends of the first frame rod 11 and the second frame rod 12 are connected by a third frame rod 13, the first bottom end of the A-shape is provided with a first engine mounting hole 14, the second bottom end of the A-shape is provided with a second engine mounting hole 15, the top end of the A-shape is provided with a first exhaust pipe mounting seat 16, the second engine mounting hole 15 is located on the Y-direction side of the first engine mounting hole 14, and the first exhaust pipe mounting seat 16 is located on the X-direction side of the first engine mounting hole 14; a second exhaust pipe mounting seat 17 is provided in the middle of the first frame rod 11, and a third exhaust pipe mounting seat 18 is provided in the middle of the second frame rod 12 near the second bottom end;

[0027] An extension plate 19 is extended toward the Y side between the second engine mounting hole 15 of the second frame rod 12 and the third exhaust pipe mounting seat 18, and the extension plate 19 is provided with a first oil pipe fixing hole 110 and a second oil pipe fixing hole 111, and the second oil pipe fixing hole 111 is located in the X direction of the first oil pipe fixing hole 110;

[0028] A first disc brake caliper mounting hole 112 and a second disc brake caliper mounting hole 113 are further provided between the first exhaust pipe mounting seat 16 and the third exhaust pipe mounting seat 18 of the second bracket 12. The second disc brake caliper mounting hole 113 is located in the X direction of the first disc brake caliper mounting hole 112.

[0029] A recessed portion 114 is disposed at the top of the A-shape. The recessed portion 114 is provided with a rear wheel mounting hole 116 . The recessed portion 114 is also provided with a shock absorber mounting hole 115 . The shock absorber mounting hole 115 is located on the Y-direction side of the third exhaust pipe mounting seat 18 .

[0030] The die-cast rear swing frame of a mid-row motorcycle involved in the above embodiment has a high structural strength when assembled on a mid-row motorcycle through structural optimization, especially the A-shaped structure formed by the first frame rod 11, the second frame rod 12 and the third frame rod 13.

[0031] As a preferred embodiment, an ABS sensor mounting hole 117 is further provided around the rear wheel mounting hole 116 .

[0032] As a preferred embodiment, the first exhaust pipe mounting seat 16, the second exhaust pipe mounting seat 17 and the third exhaust pipe mounting seat 18 have the same shape, which is a boss extending in the Z direction, and a connecting hole is provided on the boss.

[0033] Reference Figure 1 The specific embodiment of the present invention also relates to the runner structure of the die-casting mold of the above-mentioned mid-row motorcycle rear cradle die-casting, including a grouting hole column 2, the grouting hole column 2 is located on the Y-direction opposite side of the rear cradle body 1, the axial direction of the grouting hole column 2 is in the Z direction, the lower part of the grouting hole column 2 is connected with a straight runner 3, the lower part of the straight runner 3 is provided with a first horizontal runner 41 toward the X-direction side, the lower part of the straight runner 3 is provided with a second horizontal runner 42 toward the X-direction opposite side, the end of the first horizontal runner 41 is connected to the top of the A-shape, the second horizontal runner 42 bypasses the first bottom end of the A-shape and is connected to the third frame rod 13, an auxiliary runner 5 is connected between the second horizontal runner 42 and the first bottom end; the second horizontal runner 42 is provided with a bending portion 421 bent upward near the first bottom end, and two auxiliary runners 5 are connected between the first frame rod 11 and the second frame rod 12.

[0034] Reference Figure 2 , Figure 2 The die casting mold runner structure of the die casting of the rear cradle of the mid-row motorcycle designed in the early stage of the research and development of the present invention is different in that: Figure 2The second cross runner 42 is not connected to the third frame rod 13, but is connected to the first frame rod 11 near the first bottom end, and then a slag ladle runner 6 is set at the first bottom end. This runner design makes the casting liquid near the first bottom end and the second bottom end uneven, which is easy to generate bubbles during the die-casting process. The first bottom end and the second bottom end of the die-casting are both used to connect the engine and are important load-bearing parts. The bubbles generated in these places will affect the overall structural strength of the rear cradle of the mid-row motorcycle, thereby affecting the driving stability of the mid-row motorcycle; refer to Figure 1 In the later stage of the present invention, the second cross runner is improved so that the second cross runner directly bypasses the first frame rod 11 and is directly connected to the third frame rod 13, and an auxiliary runner 5 is connected between the second cross runner 42 and the first bottom end; the second cross runner 42 is provided with a bending portion 421 bent upward near the first bottom end. This improvement makes the casting liquid distribution of the mid-row motorcycle die-casting more uniform, and no bubbles will appear in various parts of the mid-row motorcycle die-casting, making the density distribution of the die-casting more uniform, effectively improving the overall structural strength of the die-casting and the stability of vehicle driving.

[0035] As a preferred embodiment, one or more auxiliary runners 5 are provided between the first cross runner 41 and the first frame rod 11, and one or more auxiliary runners 5 are connected between the second cross runner 42 and the first frame rod 11; multiple slag ladle runners 6 are respectively connected to the Y-direction side of the rear cradle body 1.

[0036] The above structure makes the pouring liquid distribution in various parts of the die casting more uniform.

[0037] As a preferred embodiment, two slag ladle runners 6 are respectively connected to the first oil pipe fixing hole 110 and the second oil pipe fixing hole 111, one of the slag ladle runners 6 is connected to the third exhaust pipe mounting seat 18, two of the slag ladle runners 6 are respectively connected to the first disc brake caliper mounting hole 112 and the second disc brake caliper mounting hole 113, and one of the slag ladle runners 6 is connected to the shock absorber mounting hole 115.

[0038] In the above embodiments, most of the slag ladle runners 6 are connected to the Y-direction side of the die casting, and the design of each auxiliary runner 5 facilitates the exhaust of the die casting and the subsequent removal of the slag ladle runner 6, further improving the density uniformity of the die casting.

[0039] As a preferred embodiment, in the runner structure of the die-casting mold of the above-mentioned mid-row motorcycle rear cradle die-casting, a slag ladle runner 6 is connected to the X-direction of the first exhaust pipe mounting seat 16. Since the structure near the first exhaust pipe mounting seat 16 is relatively complex, the slag ladle runner 6 is provided there to facilitate the exhaust of the die-casting and further improve the density uniformity of the die-casting.

[0040] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A die casting for a rear cradle of a mid-row motorcycle, characterized in that: The invention comprises a rear cradle body, wherein the rear cradle body is in an A shape, and the X-direction ends of the first frame rod and the second frame rod are connected to form the top end of the A shape, the other end of the first frame rod is the first bottom end, the other end of the second frame rod is the second bottom end, and the other ends of the first frame rod and the second frame rod are connected by a third frame rod, the first bottom end of the A shape is provided with a first engine mounting hole, the second bottom end of the A shape is provided with a second engine mounting hole, the top end of the A shape is provided with a first exhaust pipe mounting seat, the second engine mounting hole is located on the Y-direction side of the first engine mounting hole, and the first exhaust pipe mounting seat is located on the X-direction side of the first engine mounting hole; the middle part of the first frame rod is provided with a second exhaust pipe mounting seat, and the middle part of the second frame rod near the second bottom end is provided with a third exhaust pipe mounting seat; An extension plate is extended toward the Y side between the second engine mounting hole of the second frame rod and the third exhaust pipe mounting seat, and a first oil pipe fixing hole and a second oil pipe fixing hole are provided on the extension plate, and the second oil pipe fixing hole is located in the X direction of the first oil pipe fixing hole; A first disc brake caliper mounting hole and a second disc brake caliper mounting hole are also provided between the first exhaust pipe mounting seat and the third exhaust pipe mounting seat of the second bracket, wherein the second disc brake caliper mounting hole is located in the X direction of the first disc brake caliper mounting hole; A recessed portion is provided at the top of the A-shape, a rear wheel mounting hole is provided in the recessed portion, and a shock absorber mounting hole is also provided in the recessed portion. The shock absorber mounting hole is located on the Y-direction side of the third exhaust pipe mounting seat.

2. The die casting of the rear cradle of a mid-row motorcycle according to claim 1, characterized in that: ABS sensor mounting holes are also provided around the rear wheel mounting holes.

3. The die casting of the rear cradle of a mid-row motorcycle according to claim 1, characterized in that: The first exhaust pipe mounting seat, the second exhaust pipe mounting seat and the third exhaust pipe mounting seat have the same shape, which is a boss extending in the Z direction, and a connecting hole is provided on the boss.

4. The die casting mold runner structure of the die casting of the rear cradle of a mid-row motorcycle according to any one of claims 1 to 3, characterized in that: It includes a grouting hole column, which is located on the Y-direction opposite side of the rear cradle body, the axial direction of the grouting hole column is in the Z direction, the lower part of the grouting hole column is connected with a straight runner, the lower part of the straight runner is provided with a first horizontal runner facing the X-direction side, the lower part of the straight runner is provided with a second horizontal runner facing the X-direction opposite side, the end of the first horizontal runner is connected to the top of the A-shape, the second horizontal runner bypasses the first bottom end of the A-shape and is connected to the third frame rod, an auxiliary runner is connected between the second horizontal runner and the first bottom end; the second horizontal runner is provided with a bending portion bending upward near the first bottom end, and two auxiliary runners are connected between the first frame rod and the second frame rod.

5. The die casting mold runner structure of the die casting of the rear cradle of a mid-row motorcycle according to claim 4, characterized in that: One or more auxiliary runners are arranged between the first horizontal runner and the first frame rod, and one or more auxiliary runners are connected between the second horizontal runner and the first frame rod; and a plurality of slag ladle runners are respectively connected to the Y-direction side of the rear cradle body.

6. The die casting mold runner structure of the die casting of the rear cradle of a mid-row motorcycle according to claim 5, characterized in that: Two of the slag ladle pouring channels are respectively connected to the first oil pipe fixing hole and the second oil pipe fixing hole, one of the slag ladle pouring channels is connected to the third exhaust pipe mounting seat, two of the slag ladle pouring channels are respectively connected to the first disc brake caliper mounting hole and the second disc brake caliper mounting hole, and one of the slag ladle pouring channels is connected to the shock absorber mounting hole.

7. The die casting mold runner structure of the die casting of the rear cradle of a mid-row motorcycle according to claim 5, characterized in that: The first exhaust pipe mounting seat is connected to a slag ladle pouring channel in the X direction.

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