Brake drum cavity, method for fixing a frame therein and brake drum produced therefrom

Abstract

The present invention discloses a brake drum cavity, a method for fixing a frame therein, and a manufactured brake drum, wherein the brake drum cavity includes a mold cavity, which is the space at the parting surface between an upper box body and a lower box body, and a frame is arranged in the mold cavity, and the frame is fixed in the mold cavity by a frame fixing member; wherein the frame is made of steel as a whole, and includes at least one circular ring, and at least three vertical rods are welded and fixed on the circular ring, and the circular ring and the vertical rods are vertically arranged, and at least one vertical rod is fixed to at least one frame fixing member, and each vertical rod is welded and fixed to any circular ring. Compared with the prior art, the technical effect of the present invention is that the present invention is provided with a frame fixing member on the frame, and the frame fixing member can fix the drum-shaped structural net in the cavity, which is convenient for casting.

Description

Technical Field

[0001] The invention relates to a brake drum for a vehicle and a method for fixing a frame in a brake drum cavity. Background Art

[0002] The brake drum is the friction pair of the drum brake. In addition to having the strength and rigidity required as a component, it should also have the highest possible and stable friction coefficient, as well as appropriate wear resistance, heat resistance, heat dissipation and heat capacity.

[0003] At present, brake drums are often used in vehicles. Brake drums used in medium and heavy-duty vehicles are mostly produced by casting. For example, Chinese patent document with application publication number CN106735094A discloses a brake drum casting method.

[0004] During the casting process, shrinkage cavities and porosity will appear. If shrinkage cavities and porosity appear in key areas (such as punching areas), it will lead to adverse consequences such as product cracking.

[0005] To this end, a drum-shaped structural net can be placed in the cavity during the casting process. For example, in the Chinese patent document with application publication number CN106735094A, the drum-shaped structural net has a certain chilling effect, which eliminates the shrinkage holes and shrinkage at the root of the brake surface and the top flange corner of the brake drum manufactured by the upper and lower two-box sand casting process, and prevents the brake drum from falling off during the installation and use of the vehicle due to the non-density of the internal material of the brake drum.

[0006] However, how to fix the drum-shaped structural net in the cavity is a relatively difficult problem. Summary of the invention

[0007] The technical problem to be solved by the present invention is: how to conveniently fix the drum-shaped structural net (frame) in the cavity when casting the brake drum.

[0008] The technical solution of the present invention is specifically as follows:

[0009] A brake drum cavity, including a mold cavity, which is the space at the parting surface between an upper box body and a lower box body, and a frame is arranged in the mold cavity, and the frame is fixed in the mold cavity by a frame fixing piece; wherein the frame is made of steel as a whole, including at least one circular ring, and at least three vertical rods are welded and fixed on the circular ring, the circular ring and the vertical rods are vertically arranged, and one vertical rod fixes at least one frame fixing piece, and each vertical rod is welded and fixed to any circular ring; the frame fixing pieces are divided into three categories: top fixing pieces, bottom fixing pieces, and middle fixing pieces, and the frame fixing pieces include at least one category of top fixing pieces and middle fixing pieces; the top fixing pieces and the bottom fixing pieces are both I-shaped as a whole, including an upper plate and a lower plate, and the upper plate and the lower plate are fixed as a whole by vertical connecting rods, the vertical connecting rod of the top fixing piece is fixed on the vertical rod, and the upper plate of the bottom fixing piece is fixed on the vertical rod; the middle fixing piece is a fixed plate , one end of which is welded to the vertical rod, and the other end extends in the direction away from the circular ring; if the frame fixing part is a top fixing part, the top fixing part is located in the top space of the cavity, and it is stuck in the parting surface between the upper box body and the lower box body, specifically: the upper surface of the upper plate contacts the upper box body, and the lower surface of the lower plate contacts the lower box body; if the frame fixing part is a bottom fixing part, the top fixing part is located in the bottom space of the cavity, and it is pressed on the lower box body, specifically: the lower surface of the lower plate contacts the lower box body, and the lower plate is stabilized on the lower box body by relying on the gravity of the frame itself; if the frame fixing part is an intermediate fixing part, the end of the intermediate fixing part extends outward until it leaves the cavity and enters the parting surface between the upper box body and the lower box body, and the intermediate fixing part is stabilized at the parting surface between the upper box body and the lower box body by relying on the pressure at the parting surface between the upper box body and the lower box body.

[0010] The frame fixing part comprises a top fixing part and a bottom fixing part, wherein the top fixing part is located at a corresponding part of the brake drum installation surface, and the bottom fixing part is located at a corresponding part of the brake drum bottom.

[0011] The frame fixing part comprises a middle fixing part and a bottom fixing part. The middle fixing part is located at the parting surface between the upper box body and the lower box body, and the bottom fixing part is located at the corresponding part of the bottom of the brake drum.

[0012] The frame fixing part comprises a top fixing part, and the top fixing part is located at a corresponding part of the brake drum mounting surface.

[0013] A method for fixing a frame in a brake drum cavity, wherein the brake drum cavity and the frame are the above-mentioned brake drum cavity and the frame. When fixing, the frame is fixed in the cavity by a frame fixing piece; the frame fixing piece includes at least one of a top fixing piece and an intermediate fixing piece.

[0014] A brake drum is integrally cast, the casting cavity is the above brake drum cavity, after casting is completed, a brake drum blank is obtained, the middle fixing piece exposed on the outer side of the brake drum blank is removed, and finally fine processing is performed.

[0015] Compared with the prior art, the technical effect of the present invention is that a frame fixing member is provided on the frame, and the frame fixing member can fix the frame in the cavity to facilitate casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the framework (a).

[0017] Figure 2 Schematic diagram of the framework (ii).

[0018] Figure 3 Schematic diagram of the framework (c).

[0019] Figure 4 Schematic diagram of the framework (iv).

[0020] Figure 5 Schematic diagram of the framework (V).

[0021] Figure 6 Schematic diagram of the framework (six).

[0022] Figure 7 Schematic diagram of the framework (VII).

[0023] Figure 8 Schematic diagram of the framework (VIII).

[0024] Fig. 9 Schematic diagram of the brake drum cavity (a).

[0025] Fig.10 Schematic diagram of the brake drum cavity (ii).

[0026] Fig.11 Schematic diagram of the brake drum cavity (c).

[0027] Fig.12 Schematic diagram of the brake drum cavity (IV). DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments thereof.

[0029] like Figure 1-8 A frame is fixed in the brake drum cavity when casting the brake drum. The frame is made of steel as a whole and includes at least one circular ring 10. At least three vertical rods 20 are welded and fixed on the circular ring 10. The circular ring 10 and the vertical rods 20 are vertically arranged. One vertical rod 20 fixes at least one frame fixing part, and each vertical rod 20 is welded and fixed to any circular ring 10.

[0030] The frame fixings are divided into three categories: top fixings 30 , bottom fixings 31 , and middle fixings 35 .

[0031] like Figure 1 The top fixing member 30 and the bottom fixing member 31 are both I-shaped as a whole, including an upper plate 301 and a lower plate 302. The upper plate 301 and the lower plate 302 are fixed as a whole through a vertical connecting rod 303. The vertical connecting rod 303 of the top fixing member 30 is fixed on the vertical rod 20, and the upper plate 301 of the bottom fixing member 31 is fixed on the vertical rod 20.

[0032] The middle fixing member 35 is a fixing plate, one end of which is welded to the vertical rod 20 , and the other end of which extends in a direction away from the circular ring 10 .

[0033] like Figure 1 The frame matches the overall height of the brake drum, there are three circular rings 10 and three vertical rods 20, the upper part of the vertical rod 20 is bent toward the central axis of the brake drum, so that the vertical rod 20 forms an L shape, the upper end of the vertical rod 20 is fixed to the top fixing piece 30, and the lower end of the vertical rod 20 is fixed to the bottom fixing piece 31.

[0034] like Figure 1 In order to avoid shrinkage cavities and shrinkage at the lower part of the brake drum (the end away from the mounting surface), the diameter of the lowest ring 10 (see reference numeral 11) among all the rings 10 is the largest; the diameter of the lower end of the vertical rod 20 (see reference numeral 21) is the largest.

[0035] In this way, the steel material size of the frame is increased, and the frame volume corresponding to the lower area of ​​the brake drum is larger, which can better play its "cold iron" effect.

[0036] like Figure 2 The frame matches the overall height of the brake drum, there are five circular rings 10 and eight vertical rods 20. The upper part of the vertical rod 20 is bent toward the central axis of the brake drum to form an L shape. The upper end of the vertical rod 20 is fixed to the top fixing piece 30, and the lower end of the vertical rod 20 is fixed to the bottom fixing piece 31.

[0037] like Figure 3 The frame matches the lower part of the brake drum as a whole (the end away from the mounting surface), the height of the frame is less than the height of the brake drum as a whole, there are three circular rings 10, and there are three vertical rods 20. The vertical rods 20 fix the middle fixing piece 35, and the lower end of the vertical rods 20 fixes the bottom fixing piece 31.

[0038] like Figure 4 The frame matches the lower part of the brake drum as a whole (the end away from the mounting surface), the height of the frame is less than the height of the brake drum as a whole, there are four circular rings 10, and seven vertical rods 20. The vertical rods 20 fix the middle fixing piece 35, and the lower end of the vertical rods 20 fixes the bottom fixing piece 31.

[0039] like Figure 5The frame matches the upper part of the brake drum as a whole (one end of the mounting surface), the height of the frame is less than the height of the brake drum as a whole, there are two circular rings 10, and there are three vertical rods 20. The upper part of the vertical rod 20 is bent toward the central axis of the brake drum so that the vertical rod 20 forms an L shape, and the upper end of the vertical rod 20 is fixed to the top fixing piece 30.

[0040] like Figure 6 The frame matches the upper part of the brake drum as a whole (one end of the mounting surface), the height of the frame is less than the height of the brake drum as a whole, there are two circular rings 10, and eight vertical rods 20. The upper part of the vertical rod 20 is bent toward the central axis of the brake drum so that the vertical rod 20 forms an L shape, and the upper end of the vertical rod 20 is fixed to the top fixing piece 30.

[0041] like Figure 7 The frame matches the lower part of the brake drum as a whole (the end away from the mounting surface), the height of the frame is less than the height of the brake drum as a whole, there is one circular ring 10, and there are three vertical rods 20. The vertical rod 20 fixes the middle fixing piece 35, and the lower end of the vertical rod 20 fixes the bottom fixing piece 31.

[0042] like Figure 8 The frame matches the lower part of the brake drum as a whole (the end away from the mounting surface), the height of the frame is less than the height of the brake drum as a whole, there is one circular ring 10, and there are eight vertical rods 20. The vertical rods 20 fix the middle fixing piece 35, and the lower end of the vertical rods 20 fixes the bottom fixing piece 31.

[0043] The density and height of the frame depend on the product structure and its mechanical performance requirements.

[0044] like Figure 9-12 A brake drum cavity includes a cavity 83, which is a space at a parting surface between an upper box body 81 and a lower box body 82, and the frame (see reference numeral 100) is fixed in the cavity 83 by a frame fixing member.

[0045] The frame fixing member includes at least one of a top fixing member 30 and a middle fixing member 35 .

[0046] If the frame fixing member is a top fixing member 30, the top fixing member 30 is located in the top space of the cavity 83, and is stuck at the parting surface between the upper box body 81 and the lower box body 82, specifically: the upper surface of the upper plate 301 contacts the upper box body 81, and the lower surface of the lower plate 302 contacts the lower box body 82.

[0047] If the frame fixing member is the bottom fixing member 31, the top fixing member 30 is located in the bottom space of the cavity 83, which presses on the lower box body 82. Specifically, the lower surface of the lower plate 302 contacts the lower box body 82, and the lower plate 302 is stabilized on the lower box body 82 by relying on the gravity of the frame itself.

[0048] If the frame fixing member is an intermediate fixing member 35, the end of the intermediate fixing member 35 extends outward until it leaves the mold cavity 83 and enters the parting surface between the upper box body 81 and the lower box body 82. Relying on the pressure at the parting surface between the upper box body 81 and the lower box body 82, the intermediate fixing member 35 is stabilized at the parting surface between the upper box body 81 and the lower box body 82.

[0049] See also Fig. 9 The frame fixing member includes a top fixing member 30 and a bottom fixing member 31. The top fixing member 30 is located at a corresponding portion of the brake drum mounting surface (see reference numeral 831), and the bottom fixing member 31 is located at a corresponding portion of the brake drum bottom (see reference numeral 832).

[0050] See also Fig.10 The frame fixing member includes an intermediate fixing member 35 and a bottom fixing member 31. The intermediate fixing member 35 is located at the parting surface between the upper box body 81 and the lower box body 82, and the bottom fixing member 31 is located at the corresponding part of the bottom of the brake drum (see Fig. 9 832 in the figure).

[0051] See also Fig.11 The frame fixing member includes a top fixing member 30, and the top fixing member 30 is located at a corresponding portion of the brake drum mounting surface ( Fig. 9 See reference numeral 831).

[0052] See also Fig.12 The frame fixing member includes an intermediate fixing member 35 and a bottom fixing member 31. The intermediate fixing member 35 is located at the parting surface between the upper box body 81 and the lower box body 82, and the bottom fixing member 31 is located at the corresponding part of the bottom of the brake drum (see Fig. 9 832 in the figure).

[0053] A method for fixing a frame in a brake drum cavity, the brake drum cavity is the above-mentioned brake drum cavity, and the frame is the above-mentioned frame fixing, and the frame (see the figure numeral 100) is fixed in the cavity 83 by a frame fixing member.

[0054] The frame fixing member includes at least one of a top fixing member 30 and a middle fixing member 35 .

[0055] If the frame fixing member is a top fixing member 30, the top fixing member 30 is located in the top space of the cavity 83, and is stuck at the parting surface between the upper box body 81 and the lower box body 82, specifically: the upper surface of the upper plate 301 contacts the upper box body 81, and the lower surface of the lower plate 302 contacts the lower box body 82.

[0056] If the frame fixing member is the bottom fixing member 31, the top fixing member 30 is located in the bottom space of the cavity 83, which presses on the lower box body 82. Specifically, the lower surface of the lower plate 302 contacts the lower box body 82, and the lower plate 302 is stabilized on the lower box body 82 by relying on the gravity of the frame itself.

[0057] If the frame fixing member is an intermediate fixing member 35, the end of the intermediate fixing member 35 extends outward until it leaves the mold cavity 83 and enters the parting surface between the upper box body 81 and the lower box body 82. Relying on the pressure at the parting surface between the upper box body 81 and the lower box body 82, the intermediate fixing member 35 is stabilized at the parting surface between the upper box body 81 and the lower box body 82.

[0058] A brake drum is integrally cast, wherein the frame is fixed in the casting cavity according to the above fixing method, and after the casting is completed, a brake drum blank is obtained, and the intermediate fixing member 35 exposed on the outer side of the brake drum blank (that is, the part of the intermediate fixing member 35 pressed on the parting surface between the upper box body 81 and the lower box body 82) is removed, and finally fine-processed.

[0059] Features of this application:

[0060] 1. By placing a frame on the brake drum, the frame is similar to the skeleton of the brake drum, which increases the mechanical properties of the brake drum. This can reduce the original amount of alloy added, reduce casting costs, reduce costs and increase efficiency, and improve market competitiveness;

[0061] 2. By placing a frame on the brake drum, the frame can play the role of "internal cooling iron". It absorbs the temperature of the molten iron, accelerates the cooling speed of a certain part of the brake drum during the casting process, reduces or eliminates shrinkage defects, and improves the yield rate.

[0062] 3. By placing a frame on the brake drum, the frame can accelerate heat dissipation, improve the strength, toughness and rigidity of the brake drum, prevent cracking, and improve safety in use.

[0063] 4. By placing a frame on the brake drum, the original size can be reduced. After optimizing the structure, the amount of material used is reduced, and it is about 10%-15% lighter than the traditional brake drum.

[0064] For other contents, please refer to the prior art.

[0065] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, which should also be regarded as the scope of protection of the present invention.

Claims

1. A brake drum cavity, comprising a cavity (83), the cavity (83) being a space at a parting surface between an upper box body (81) and a lower box body (82), a frame being provided in the cavity (83), and the frame being fixed in the cavity (83) by a frame fixing member; in, The frame is made of steel as a whole, and comprises at least one circular ring (10). At least three vertical rods (20) are welded and fixed on the circular ring (10). The circular ring (10) and the vertical rods (20) are vertically arranged. One vertical rod (20) is fixed with at least one frame fixing member. Each vertical rod (20) is welded and fixed to any circular ring (10). The frame fixing parts are divided into three categories: a top fixing part (30), a bottom fixing part (31), and an intermediate fixing part (35), and the frame fixing parts include at least one of the top fixing part (30) and the intermediate fixing part (35); The top fixing member (30) and the bottom fixing member (31) are both in an I-shape as a whole, and include an upper plate (301) and a lower plate (302). The upper plate (301) and the lower plate (302) are fixed as a whole via a vertical connecting rod (303). The vertical connecting rod (303) of the top fixing member (30) is fixed on the vertical rod (20), and the upper plate (301) of the bottom fixing member (31) is fixed on the vertical rod (20). The middle fixing member (35) is a fixing plate, one end of which is welded to the vertical rod (20) and the other end of which extends in a direction away from the circular ring (10); If the frame fixing member is a top fixing member (30), the top fixing member (30) is located in the top space of the cavity (83), and is stuck at the parting surface between the upper box body (81) and the lower box body (82), specifically: the upper surface of the upper plate (301) contacts the upper box body (81), and the lower surface of the lower plate (302) contacts the lower box body (82); If the frame fixing member is a bottom fixing member (31), the top fixing member (30) is located in the bottom space of the cavity (83), and is pressed on the lower box (82). Specifically, the lower surface of the lower plate (302) contacts the lower box (82), and the lower plate (302) is stabilized on the lower box (82) by the gravity of the frame itself; If the frame fixing member is an intermediate fixing member (35), the end of the intermediate fixing member (35) extends outward until it leaves the mold cavity (83) and enters the parting surface between the upper box body (81) and the lower box body (82). The intermediate fixing member (35) is stabilized at the parting surface between the upper box body (81) and the lower box body (82) by relying on the pressure at the parting surface between the upper box body (81) and the lower box body (82).

2. The brake drum cavity according to claim 1, characterized in that: The frame fixing member comprises a top fixing member (30) and a bottom fixing member (31), wherein the top fixing member (30) is located at a corresponding portion of the brake drum mounting surface, and the bottom fixing member (31) is located at a corresponding portion of the brake drum bottom.

3. The brake drum cavity according to claim 1, characterized in that: The frame fixing member comprises an intermediate fixing member (35) and a bottom fixing member (31), the intermediate fixing member (35) being located at the parting surface between the upper box body (81) and the lower box body (82), and the bottom fixing member (31) being located at a corresponding portion of the bottom of the brake drum.

4. The brake drum cavity according to claim 1, characterized in that: The frame fixing member comprises a top fixing member (30), and the top fixing member (30) is located at a corresponding portion of the brake drum mounting surface.

5. A method for fixing a frame to a brake drum cavity, characterized in that: The brake drum cavity and frame are the brake drum cavity and frame as described in claim 1. When fixed, the frame is fixed in the cavity (83) by a frame fixing member; the frame fixing member includes at least one of a top fixing member (30) and an intermediate fixing member (35).

6. A brake drum, integrally cast, characterized in that: The casting cavity is the brake drum cavity as described in claim 1. After the casting is completed, a brake drum blank is obtained, and the intermediate fixing member (35) exposed on the outer side of the brake drum blank is removed, and finally fine-processed.

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