Wheel drum and disc combined type brake structure

Abstract

The utility model relates to the field of brake systems, and discloses a wheel drum and disc combined type brake structure, which comprises a drum ring, a disc and a disc, the drum ring comprises an inner ring surface and a plurality of drum combination holes, the inner ring surface can be abutted against a drum type brake shoe, and the drum combination holes are positioned on the periphery of the inner ring surface; the disc comprises a central hole and a plurality of disc combination holes positioned on the hole wall of the central hole; the connecting seat comprises a central block and a plurality of seat combination holes, the central block can be locked by a wheel shaft bolt, and the seat combination holes are formed in the periphery of the central block; the material specific gravity of the connecting seat is smaller than that of the drum ring; the fixing devices are respectively arranged at the drum combination hole of the drum ring, the disc combination hole of the disc and the seat combination hole of the connecting seat in a penetrating manner, so that the drum ring, the disc and the connecting seat are combined and fixed, and the drum ring is partially positioned in the central hole of the disc; and the connecting seat is connected with the drum ring and is partially positioned in the central hole of the disc and partially exposed out of the central hole in a protruding manner. Therefore, the integral structure is light in weight, and structural rigidity and wear resistance are kept.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of brake system technical field, especially about a kind of drum-in-hat brake assembly. BACKGROUND

[0002] The existing drum-in-hat park brake assembly includes drum for drum brake and disc for disc brake, drum is arranged in the center of disc to form a structure similar to hat, drum has an inner ring surface for brake shoe friction top resistance, and end surface for wheel shaft bolt locking, traditional drum and disc are integrally cast or forged into shape, or drum and disc are cast or forged respectively, then welded or bolted together.

[0003] Since drum needs to withstand brake shoe friction top resistance force and needs to provide certain structural strength, traditionally drum is made of cast iron, so it is heavy, not only increases the weight of the whole vehicle, but also affects transmission efficiency, and needs to be improved. Secondly, how to stably combine drum and disc together, and easily assemble and disassemble, is also the goal to be strived for in the field. SUMMARY

[0004] To solve the above problems, one of the purposes of the utility model is to provide a kind of drum-in-hat brake assembly, which has lightweight overall structure and can maintain structural rigidity and wear resistance.

[0005] Another purpose of the utility model is to provide a kind of drum-in-hat brake assembly, which has stable combination structure and is easy to assemble and disassemble.

[0006] To achieve the above purpose, the drum-in-hat brake assembly provided by the utility model includes a drum ring, a disc, a connecting seat and a plurality of fixing devices. The drum ring includes an inner ring surface for drum brake shoe abutment and a plurality of drum combination holes on the periphery of the inner ring surface. The disc includes a central hole and a plurality of disc combination holes on the hole wall of the central hole. The connecting seat includes a central block for wheel shaft bolt locking and a plurality of seat combination holes on the periphery of the central block. The specific gravity of the material of the connecting seat is less than that of the drum ring. The plurality of fixing devices are respectively arranged in the drum combination holes of the drum ring, the disc combination holes of the disc and the seat combination holes of the connecting seat, so that the drum ring, the disc and the connecting seat are combined and fixed. The drum ring is partially located in the central hole of the disc, and the connecting seat is connected with the drum ring and partially located in the central hole of the disc and partially exposed outside the central hole.

[0007] Therefore, the drum ring and the linking seat can be combined to form a wheel drum similar to the wheel drum in the conventional drum and disc combined brake structure, i.e., the inner ring surface of the drum ring is used for the frictional abutment of brake shoes, the linking seat is used for fixing and linking the drum ring to the disc, and the wheel shaft is bolted. Secondly, the drum and disc combined brake structure of the present application has the material specific gravity of the linking seat smaller than the material specific gravity of the drum ring, for example, the linking seat is made of aluminum alloy and the drum ring is made of cast iron. Compared with the prior art of the wheel drum made of cast iron and integrally formed, the drum ring combined by the drum ring and the linking seat of the present application has a lighter overall structure, and the drum ring can have the necessary rigidity and wear resistance by the drum ring with a larger material specific gravity, thereby achieving the purpose of the present application.

[0008] Preferably, the material of the drum ring is cast iron or steel, the material of the disc is cast iron, steel, or ceramic and carbon fiber composite material, and the material of the linking seat is aluminum alloy. Therefore, the linking seat made of aluminum alloy can make the overall structure lightweight, and the drum ring made of cast iron or steel can make the drum ring have rigidity and wear resistance.

[0009] Preferably, the drum ring includes a ring body portion and a fixed ring piece horizontally and radially extending and connected to the ring body portion, the inner ring surface is formed on the ring body portion, and the drum combination hole is provided in the fixed ring piece. Through the design of the fixed ring piece, the fixed ring piece can be abutted to the hole wall of the central hole of the disc, so that the drum ring, the disc and the linking seat are more easily assembled or disassembled and can be stably fixed together.

[0010] Preferably, the hole wall of the central hole of the disc has a plurality of bosses, each boss has a disc combination hole, and the fixed ring piece of the drum ring is arranged on the bosses of the disc, so that each drum combination hole corresponds to each disc combination hole. Therefore, the arrangement of the drum ring and the disc can be more balanced, and the combination stability can be improved.

[0011] Preferably, the linking seat includes a seat cylinder and a seat chamber formed in the seat cylinder, the ring body portion of the drum ring is accommodated in the seat chamber of the linking seat and abuts against the inner wall surface of the seat cylinder. By accommodating the ring body portion of the drum ring in the seat cylinder of the linking seat, the ring body portion of the drum ring can be protected and deformation of the ring body portion of the drum ring can be prevented, and the ring body portion abuts against the inner wall surface of the seat cylinder, so that the combination of the drum ring and the linking seat is more stable.

[0012] Preferably, the disc has a plurality of bosses forming the hole wall of the central hole, and each disc combination hole penetrates each boss. The bosses can increase the structural strength of the disc, and the combination of the drum ring and the disc can be more stable.

[0013] Preferably, the fixing device includes a bolt and a nut; the bolt passes through the drum joint hole of the drum ring, the disc joint hole of the disc plate, and the seat joint hole of the connecting seat, and is locked with the nut, so that the drum ring, the disc plate, and the connecting seat are clamped between the head of the bolt and the nut. Thus, the drum ring, the disc plate, and the connecting seat can be firmly combined and fixed.

[0014] Preferably, the fixing device includes a bolt, a sleeve, a gasket, and a nut; the gasket is clamped between the first rear surface of the disc plate and the second front surface of the connecting seat and has a gasket through hole; the sleeve includes a contact portion and a passing portion connected with each other, and a sleeve through hole passing through the contact portion and the passing portion; the passing portion of the sleeve is arranged in the disc joint hole, the seat joint hole, and the gasket through hole; the bolt includes a head portion and a rod portion connected with each other; the rod portion passes through the sleeve through hole and includes a threaded segment; and the nut is screwed and fixed on the threaded segment, so that the drum ring, the disc plate, the gasket, the connecting seat, and the contact portion of the sleeve are clamped between the head of the bolt and the nut.

[0015] Preferably, the sleeve of the fixing device has two grooves formed in the contact portion; each of the seat joint holes includes a groove having a groove bottom surface, and the inner edge of the groove bottom surface is arranged in the groove. Thus, the sleeve of the fixing device and the connecting seat can be ensured to be completely close.

[0016] Preferably, the sleeve of the fixing device has two opposite installation planes arranged in the passing hole of the connecting seat. Thus, the direction of the sleeve installed in the connecting seat can be ensured to be correct.

[0017] Preferably, the gasket of the fixing device includes two inner hole edges formed in the gasket through hole and matched with the installation planes of the sleeve. Thus, the relative direction of the gasket relative to the sleeve and the connecting seat can be ensured to be correct, and the gasket is prevented from rotating.

[0018] Preferably, the sleeve of the fixing device includes two protrusions respectively formed in the installation planes, and the protrusions of the sleeve are clamped in the passing hole of the connecting seat. Thus, the sleeve can not be separated from the connecting seat before being locked.

[0019] The detailed structure, characteristics, assembly or use mode of the drum and disc combined brake structure provided by the present application will be described in the following detailed description of embodiments. However, those skilled in the art should understand that the detailed description and the specific examples listed in the implementation of the present application are only used to illustrate the present application, and are not used to limit the patent application range of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1A perspective assembly view of the drum and disc combined brake structure provided by the preferred embodiment of the present application.

[0021] Figure 2 Another perspective assembly view of the drum and disc combined brake structure provided by the preferred embodiment of the present application.

[0022] Figure 3 A perspective exploded view of the drum and disc combined brake structure provided by the preferred embodiment of the present application.

[0023] Figure 4 Another perspective exploded view of the drum and disc combined brake structure provided by the preferred embodiment of the present application.

[0024] Figure 5 A front view of the drum and disc combined brake structure provided by the preferred embodiment of the present application.

[0025] Figure 6 A Figure 5 A sectional view along the direction of the cutting line 6-6 in the figure.

[0026] Figure 7 A Figure 6 A local enlarged view in the figure.

[0027] Figure 8 A perspective exploded view of a fixing device of the drum and disc combined brake structure provided by the preferred embodiment of the present application.

[0028] Figure 9 A Figure 5 A sectional view along the direction of the cutting line 9-9 in the figure.

[0029] Figure 10 A Figure 9 A local enlarged view in the figure.

[0030] Explanation of reference signs:

[0031] 1:wheel drum and disc combined brake structure; 10:drum ring; 11:ring body; 111:inner ring surface; 12:fixed ring piece; 121:drum combination hole; 20:disc; 20a:center hole; 21:first front surface; 22:first back surface; 23:boss; 24:disc combination hole; 30:connecting seat; 31:second front surface; 32:second back surface; 322:central block; 323:outer periphery; 324:peripheral block; 33:seat cylinder; 331:seat chamber; 34:seat combination hole; 341:groove; 342:slot opening; 343:inner edge; 344:outer edge; 345:groove bottom surface; 346:groove inner wall; 347:through hole; 348:opening; 35:outer peripheral surface; 40:fixing device; 41:bolt; 411:head; 412:stem; 414:threaded section; 42:washer; 421:long side; 423:washer through hole; 424:first plane; 425:inner hole edge; 43:sleeve; 431:abutment; 431a:second plane; 431b:groove; 432:through portion; 433:large through section; 434:middle through section; 434a:third plane; 435:inclined section; 436:small through section; 437:sleeve through hole; 438:side plane; 439:mounting plane; 439a:projection; 44:nut. DETAILED DESCRIPTION

[0032] Applicant first explains that in the embodiments and drawings to be introduced below, the same numbers represent the same or similar components or structural features.

[0033] Please refer to Figure 1 and Figure 2 The wheel drum and disc combined brake structure 1 provided by the preferred embodiment of the utility model includes a drum ring 10, a disc 20, a connecting seat 30, and ten fixing devices 40. The utility model has no limitation on the number of fixing devices 40, which can be adjusted according to the structural requirements. Secondly, the drum ring 10 and the connecting seat 30 of the utility model are combined with each other, that is, a wheel drum in the wheel drum and disc combined brake structure 1 of the utility model is formed.

[0034] The wheel drum and disc combined brake structure 1 is used for being fixed to the axle bolt (not shown in the figure) of a vehicle wheel and rotating with the vehicle wheel, so that a rotation axis can be defined, that is, the direction of the arrow A in the figure. Figure 1The X-axis shown in the middle, the utility model defines the positive direction of X-axis as the first direction, and the negative direction of X-axis as the second direction. In addition, the transverse direction in the utility model refers to any direction perpendicular to the aforementioned rotation axis direction (i.e. perpendicular to the first direction and the second direction), in other words, the transverse direction in the utility model is located in the Y-Z plane, therefore, the transverse dimension of each component in the utility model refers to the width, diameter and other dimensions defined by the Y-Z plane, and the cross-sectional shape of each component in the utility model refers to the cross-sectional shape in the Y-Z plane.

[0035] The utility model has no limitation on the shape of the drum ring 10, the disc 20 and the connecting seat 30.

[0036] As shown in Figure 3 and Figure 4 , the drum ring 10 comprises a ring body part 11 and a fixed ring piece 12 which is connected to the ring body part and extends horizontally and radially outward. The ring body part 11 is in a cylindrical shape and has an inner ring surface 111, which can be used for the brake shoes (not shown in the figure) of the drum brake to abut and rub. The fixed ring piece 12 has a plurality of lugs which are equally spaced around the periphery of the ring body part 11, and a plurality of drum combination holes 121 which respectively pass through the lugs. The material of the drum ring 10 is preferably a material with a relatively large specific gravity, such as cast iron, steel or the like, so that the drum ring 10 can be more rigid and more wear-resistant.

[0037] As shown in Figure 3 and Figure 4 , the disc 20 is used for the brake pads (not shown in the figure) of the disc brake to abut and rub, and the disc 20 has a central hole 20a, the hole wall of the central hole 20a has a first front surface 21 facing the first direction (the positive direction of the X-axis), the disc 20 has a first rear surface 22 facing the second direction (the negative direction of the X-axis), a plurality of bosses 23 formed on the hole wall of the central hole 20a and equally spaced around the axis of the central hole 20a, and ten disc combination holes 24 passing through the bosses 23. The material of the disc 20 can be general cast iron or steel, or a ceramic and carbon fiber composite material with a relatively light weight can be used, so that a cast iron disc, a steel disc or a ceramic and carbon disc can be formed, and the disc 20 with a vent hole design is used in the embodiment, but a solid disc can also be used. When assembled, as shown in Figure 6 and Figure 7 , the ring body part 11 of the drum ring 10 is inserted into the central hole 20a of the disc 20, so that the fixed ring piece 12 of the drum ring 10 abuts against the bosses 23 of the disc 20, and each drum combination hole 121 corresponds to each disc combination hole 24.

[0038] As shown in Figure 3 and Figure 4 , the disc 20 is used for the brake pads (not shown in the figure) of the disc brake to abut and rub, and the disc 20 has a central hole 20a, the hole wall of the central hole 20a has a first front surface 21 facing the first direction (the positive direction of the X-axis), the disc 20 has a first rear surface 22 facing the second direction (the negative direction of the X-axis), a plurality of bosses 23 formed on the hole wall of the central hole 20a and equally spaced around the axis of the central hole 20a, and ten disc combination holes 24 passing through the bosses 23. The material of the disc 20 can be general cast iron or steel, or a ceramic and carbon fiber composite material with a relatively light weight can be used, so that a cast iron disc, a steel disc or a ceramic and carbon disc can be formed, and the disc 20 with a vent hole design is used in the embodiment, but a solid disc can also be used. When assembled, as shown inAs shown, the material of the connecting seat 30 is preferably a material with a smaller specific gravity (e.g. aluminum alloy), i.e. the specific gravity of the material of the connecting seat 30 is smaller than that of the drum ring 10, so that the wheel drum formed by the connecting seat 30 and the drum ring 10 has a lighter overall structure, thereby achieving the purpose of lightening the wheel drum of the present application. Further, the connecting seat 30 comprises a second front surface 31, a second rear surface 32, a seat cylinder 33, ten seat combination holes 34, and an outer peripheral surface 35. The second rear surface 32 comprises a central block 322, an outer peripheral edge 323, and a peripheral block 324. The seat cylinder 33 is connected to the second front surface 31 and forms a seat chamber 331, as shown in Figure 3 As shown, the inner wall surface of the seat cylinder 33 has a step portion. During assembly, as shown in Figure 6 and Figure 7 As shown, the ring body portion 11 of the drum ring 10 is accommodated in the seat chamber 331 of the connecting seat 30, the outer wall surface of the ring body portion 11 abuts against the inner wall surface of the seat cylinder 33, and the step portion of the inner wall surface of the seat cylinder 33 can be stopped at the ring end surface of the ring body portion 11. In this way, at least a portion of the drum ring 10 is located in the central hole 20a of the disc 20, the connecting seat 30 and the drum ring 10 can be stably connected, and a portion of the connecting seat 30 is located in the central hole 20a of the disc 20 and a portion protrudes out of the central hole 20a. Further, the seat combination hole 34 comprises a groove 341 and a through hole 347. The groove 341 comprises a groove opening 342, an inner edge 343, an outer edge 344, a groove bottom surface 345, and a groove inner wall 346. The through hole 347 has an opening 348.

[0039] The second front surface 31 faces the first direction, the second rear surface 32 faces the second direction, the seat combination hole 34 penetrates the front and rear surfaces 31, 32, and the outer peripheral surface 35 is formed at the outer edge of the peripheral block 324.

[0040] The central block 322 of the second rear surface 32 of the connecting seat 30 is a circular ring plane, and has a plurality of assembly holes for passing through the wheel shaft bolts (not shown in the figure) to be locked. The peripheral block 324 is located at the periphery of the central block 322 and is slightly arc-shaped, and the peripheral block 324 extends outward from the outer periphery 323 of the central block 322 and forward to the outer peripheral surface 35 of the connecting seat 30, wherein the "outward" means the direction away from the outer periphery 323, and the "forward" means the direction close to the second front surface 31. The recess 341 of each seat combination hole 34 is recessed from the peripheral block 324 of the second rear surface 32 of the connecting seat 30, the slot opening 342 of the recess 341 is located at the peripheral block 324, the inner edge 343 of the slot opening 342 is located at the outer periphery 323 of the central block 322, the outer edge 344 is opposite to the inner edge 343 and adjacent to the outer peripheral surface 35 of the connecting seat 30, the slot bottom surface 345 of the recess 341 is connected with the outer edge 344 of the slot opening 342, and the slot inner wall 346 extends from the inner edge 343 of the slot opening 342 to the slot bottom surface 345. The through hole 347 extends from the slot bottom surface 345 of the recess 341 to the second front surface 31 of the connecting seat 30, and the slot inner wall 346 of the recess 341 is connected with the through hole 347, that is, the slot inner wall 346 is directly connected with part of the hole wall of the through hole 347 as the same surface, and each opening 348 respectively opens the through hole 347 of each seat combination hole 34 and the outer peripheral surface 35.

[0041] As shown in Figure 8 The fixing device 40 is respectively arranged at the drum combination hole 121 of the drum ring 10, the disc combination hole 24 of the disc plate 20 and the seat combination hole 34 of the connecting seat 30, so as to combine the drum ring 10, the disc plate 20 and the connecting seat 30 with each other, which will be described in detail as follows.

[0042] As shown in Figure 8As shown, each fixing device 40 comprises a bolt 41, a washer 42, a sleeve 43 and a nut 44. The bolt 41 has a head 411 and a shank 412 connected with each other, and the shank 412 comprises a threaded segment 414 at the end thereof. The washer 42 is a thin plate with four corners rounded and slightly arc-shaped along two long edges 421 to match the shape of the connecting seat 30, but the present application is not limited thereto. The washer 42 comprises a washer hole 423 in the center thereof, and the cross-sectional shape of the washer hole 423 is substantially circular, only a part of the hole wall is a first plane 424 instead of a circular arc surface, and another part of the hole wall forms two opposite inner hole edges 425, in other words, the washer hole 423 is non-circular. The sleeve 43 comprises an abutting portion 431, a penetrating portion 432, a sleeve hole 437, a side plane 438 and an installation plane 439 connected with each other, and the penetrating portion 432 comprises a large penetrating segment 433, a middle penetrating segment 434, an inclined segment 435 and a small penetrating segment 436 connected in sequence from the abutting portion 431, and the transverse dimensions are also in the above-mentioned sequence from large to small. In addition, the sleeve hole 437 penetrates through the abutting portion 431, the large penetrating segment 433, the middle penetrating segment 434, the inclined segment 435 and the small penetrating segment 436. Each installation plane 439 is formed with a protrusion 439a.

[0043] As shown, Figure 6 to Figure 10 During assembly, the penetrating portion 432 of the sleeve 43 sequentially passes through the seat combination hole 34 of the connecting seat 30 and the washer hole 423 of the washer 42 from the second rear surface 32 of the connecting seat 30, and then is inserted into the disc combination hole 24 of the disc 20, so that the large penetrating segment 433 is located in the seat combination hole 34 of the connecting seat 30, the middle penetrating segment 434 and the inclined segment 435 are located in the washer hole 423 of the washer 42, the small penetrating segment 436 is located in the disc combination hole 24 of the disc 20, and the washer 42 is clamped between the first rear surface 22 of the disc 20 and the second front surface 31 of the connecting seat 30. Then, the shank 412 of the bolt 41 penetrates through the sleeve hole 437 of the sleeve 43 from the drum combination hole 121 of the drum 10, and the threaded segment 414 of the bolt 41 protrudes out of the abutting portion 431 of the sleeve 43. Finally, the threaded segment 414 of the bolt 41 is screwed with the nut 44, so that the head 411 of the bolt 41 abuts against the drum 10, the nut 44 abuts against the connecting seat 30, and the drum 10, the disc 20, the washer 42, the connecting seat 30 and the abutting portion 431 of the sleeve 43 are clamped between the head 411 of the bolt 41 and the nut 44, so that the drum 10, the disc 20 and the connecting seat 30 can be stably combined together. The shapes and size relationships of the parts of the sleeve and the holes will be further described below.

[0044] As shown, Figure 6 to Figure 10As shown, the abutting portion 431 of the sleeve 43 has a cross-sectional shape of a rectangle with similar length and size to the gasket 42, only the two short sides of the abutting portion 431 are arc-shaped, and the large penetrating section 433 of the sleeve 43 has a cross-sectional shape of a rectangle with four corners being rounded, and the two short sides of the large penetrating section 433 are flush with the two long sides of the abutting portion 431 to form two side planes 438 of the sleeve 43, in other words, the two side planes 438 are located on opposite sides of the sleeve 43, and each side plane 438 is located on the abutting portion 431 and the large penetrating section 433. The two installation planes 439 of the sleeve 43 are perpendicular to the two side planes 438 and are located on the two sides, and the two installation planes 439 are accommodated in the penetrating hole 347 of the connecting seat 30, the distance between the two installation planes 439 is smaller than the distance between the two side planes 438, and the installation plane 439 can also abut against the inner hole edge 425 of the gasket 42.

[0045] When the assembly is completed, the large penetrating section 433 of the sleeve 43 is arranged in the penetrating hole 347 of the seat combining hole 34, the abutting portion 431 of the sleeve 43 is arranged in the groove 341 of the seat combining hole 34 and abuts against the groove bottom surface 345. One of the side planes 438 of the sleeve 43 faces the groove inner wall 346 and is close to each other, and the other side plane 438 does not exceed the outer circumferential surface 35 of the connecting seat 30. In addition, in the present embodiment, the outer edge 344 of the groove opening 342 of the groove 341 is connected with the opening 348 of the penetrating hole 347, which can make the large penetrating section 433 of the sleeve 43 enter the penetrating hole 347 of the seat combining hole 34 from the opening 348, thereby facilitating the assembly.

[0046] In the present embodiment, the peripheral block 324 of the connecting seat 30 has a relatively thick structure, so not only the structural strength is good, but also the groove 341 as described above can be arranged to position the abutting portion 431 of the sleeve 43 in the groove 341, so that the fixing device 40 can fix the disc 20 and the connecting seat 30 more effectively.

[0047] The abutting portion 431 of the sleeve 43 has a substantially circular cross-sectional shape, except that one side thereof is a second flat surface 431a that matches the shape of the connecting seat 30, and two grooves 431b are formed between the abutting portion 431 and the large through segment 433. The abutting portion 431 has a dimension in the Y-axis and Z-axis directions that is greater than the seat combining hole 34, and when assembled, the abutting portion 431 abuts against the second rear surface 32 of the connecting seat 30. The large through segment 433 of the sleeve 43 and the seat combining hole 34 of the connecting seat 30 both have a non-circular cross-sectional shape, such as a substantially rectangular shape in this embodiment. This feature can limit the sleeve 43 from rotating relative to the connecting seat 30, so that the fixing effect of the fixing device 40 is better. The lateral dimension (width along the Y-axis in the figure) of the short side of the large through segment 433 of the sleeve 43 is similar to the diameter of the washer through hole 423 of the washer 42, and the lateral dimension (width along the Z-axis in the figure) of the long side of the large through segment 433 is greater than the diameter of the washer through hole 423, so that the large through segment 433 cannot enter the washer through hole 423. The lateral dimension of the middle through segment 434 of the sleeve 43 matches the lateral dimension of the washer through hole 423, i.e., the dimensions of the two are similar, so that the middle through segment 434 can just enter the washer through hole 423. More specifically, the middle through segment 434 has a substantially circular cross-sectional shape, except that three sides thereof are third flat surfaces 434a (only the one facing the positive direction of the Y-axis is shown in the figure, and the other two facing the negative direction of the Y-axis and the negative direction of the Z-axis are not shown), and the diameter of the middle through segment 434 is only slightly smaller than the diameter of the washer through hole 423. The positions and dimensions of the third flat surfaces 434a correspond to the first flat surface 424 of the washer through hole 423, and when assembled, one of the third flat surfaces 434a of the middle through segment 434 abuts against the first flat surface 424 of the washer through hole 423. In other words, the middle through segment 434 and the washer through hole 423 both have a non-circular cross-sectional shape, which can limit the sleeve 43 and the washer 42 from rotating relative to each other, so that the fixing effect of the fixing device 40 is better. The inclined segment 435 of the sleeve 43 has a circular cross-sectional shape, and its diameter gradually decreases from the middle through segment 434 to the small through segment 436. The small through segment 436 is a cylindrical segment with a fixed diameter that is smaller than the diameter of the middle through segment 434 and similar to the diameter of the disc combining hole 24 of the disc 20, so that the small through segment 436 can just be inserted into the disc combining hole 24.

[0048] Through the fixing device 40, the disc 20 and the connecting seat 30 are clamped with the washer 42 therebetween. The washer 42 can be made of a material that has greater elasticity, or can be made into a warped shape or other shape that can elastically deform, so that the disc 20 can slightly move axially relative to the connecting seat 30 through the elasticity of the washer 42 while maintaining abutment with the nut 44 and the washer 42 on the front and rear surfaces 21 and 22 thereof, i.e., the disc 20 can slightly have a floating effect.

[0049] The sleeve 43 in the above embodiment is inserted into the disc engaging hole 24 of the disc 20 via the seat engaging hole 34 of the connecting seat 30 and the washer hole 423 of the washer 42, and the seat engaging hole 34, the washer hole 423 and the disc engaging hole 24 are matched with the shapes of the large, medium and small penetrating segments 433, 434 and 436, and the lateral sizes are in order from large to small. However, the setting direction of the sleeve 43 can also be reversed, such that the abutting portion 431 of the sleeve 43 abuts against the first front surface 21 of the disc 20, as long as the holes are correspondingly changed. In addition, the setting direction of the bolt 41 can also be reversed, that is, the position of the head 411 of the bolt 41 and the nut 44 can be exchanged. However, the setting direction of the sleeve 43 and the bolt 41 as shown in the above embodiment is more beneficial to manufacturing and assembly, and can produce better fixing effect.

[0050] In addition, the sleeve 43 of the fixing device 40 comprises two grooves 431b formed between the abutting portion 431 and the large penetrating segment 433, and the inner edge of the groove bottom surface 345 of the connecting seat 30 can be accommodated in the groove 431b. Therefore, the sleeve 43 of the fixing device 40 and the connecting seat 30 can be ensured to be completely close.

[0051] In addition, the sleeve 43 of the fixing device 40 comprises two mounting planes 439 opposite to each other and perpendicular to the two side planes 438, the two mounting planes 439 are accommodated in the penetrating hole 347 of the connecting seat 30, and the distance between the two mounting planes 439 is smaller than the distance between the two side planes 438, so that the direction of the sleeve 43 mounted on the connecting seat 30 can be ensured to be correct.

[0052] In addition, the washer 42 of the fixing device 40 comprises two inner hole edges 425 formed in the washer hole 423 and matched with the mounting planes 439 of the sleeve 43, so that the relative direction of the washer 42 relative to the sleeve 43 and the connecting seat 30 can be ensured to be correct, and the washer 42 is prevented from rotating.

[0053] Furthermore, the sleeve 43 of the fixing device 40 comprises two protrusions 439a formed on the mounting planes 439 respectively, and the two protrusions 439a of the sleeve 43 can be clamped in the penetrating hole 347 of the connecting seat 30, so that the sleeve 43 cannot be separated from the connecting seat 30 before being locked.

[0054] It needs to be further explained that the fixing device provided by the present application is not limited to the above embodiments, for example, it can only comprise the bolt 41 and the nut 44, the bolt 41 is penetrated through the drum engaging hole 121 of the drum 10, the disc engaging hole 24 of the disc 20 and the seat engaging hole 34 of the connecting seat 30, and is locked in the nut 44, so that the drum 10, the disc 20 and the connecting seat 30 are clamped between the head 411 of the bolt 41 and the nut 44, and the effect of locking the drum 10, the disc 20 and the connecting seat 30 together can also be achieved.

[0055] In summary, the drum ring 10 and the connecting seat 30 can constitute the drum in the drum and disc combined brake structure 1, and the material specific gravity of the connecting seat 30 is less than that of the drum ring 10, for example, the connecting seat 30 is made of aluminum alloy material and the drum ring 10 is made of cast iron material, compared with the traditional drum which is integrally formed by cast iron, the drum (i.e., the combination of the drum ring 10 and the connecting seat 30) provided by the utility model has a lighter overall structure weight, and the drum ring 10 with a larger material specific gravity can ensure the rigidity and wear resistance of the drum, thereby achieving the purpose of the utility model.

[0056] Finally, it must be noted again that the components described in the foregoing embodiments are only for illustration and are not intended to limit the scope of the utility model, and other equivalent components or changes should also be covered by the patent scope of the utility model.

Claims

1. A combined wheel drum and disc brake structure, characterized in that, The drum ring includes an inner ring surface for abutting with drum brake shoes and drum coupling holes arranged around the inner ring surface. The disc plate includes a central hole and disc coupling holes arranged on the hole wall of the central hole. The connecting seat includes a central block for screwing with axle bolts and seat coupling holes arranged around the central block. The connecting seat has a smaller specific gravity than the drum ring. The drum ring is made of cast iron or steel, the disc plate is made of cast iron, steel, ceramic or carbon fiber composite material, and the connecting seat is made of aluminum alloy.

2. The drum and disc combined brake structure as claimed in claim 1, wherein, The drum ring includes a ring body and a fixing ring plate connected to the ring body and extending horizontally and radially, the inner ring surface is formed on the ring body, and the drum coupling holes are arranged through the fixing ring plate.

3. The drum and disc combined brake structure as claimed in claim 1 wherein, The hole wall of the central hole of the disc plate has a plurality of bosses, each boss has a disc coupling hole, and the fixing ring plate of the drum ring is arranged against the bosses of the disc plate, so that each drum coupling hole corresponds to each disc coupling hole.

4. The drum and disc combination brake structure as claimed in claim 3 wherein, The connecting seat includes a seat cylinder and a seat chamber formed in the seat cylinder, the ring body of the drum ring is accommodated in the seat chamber of the connecting seat and abuts against the inner wall surface of the seat cylinder.

5. The drum and disc combination brake structure as claimed in claim 3 wherein, The disc plate has a plurality of bosses formed on the hole wall of the central hole, and each disc coupling hole is arranged through each boss.

6. The drum and disc combined brake structure as claimed in claim 1 wherein, The fixing device includes a bolt and a nut, the bolt passes through the drum coupling hole of the drum ring, the disc coupling hole of the disc plate and the seat coupling hole of the connecting seat, and is screwed with the nut, so that the drum ring, the disc plate and the connecting seat are clamped between the head of the bolt and the nut.

7. The drum and disc combined brake structure as claimed in claim 1 wherein, The fixing device includes a bolt, a sleeve, a gasket and a nut, the gasket is clamped between the first rear surface of the disc plate and the second front surface of the connecting seat and has a gasket through hole, the sleeve includes a contact part and a penetrating part connected with each other, and a sleeve through hole penetrating the contact part and the penetrating part, the penetrating part of the sleeve is arranged in the disc coupling hole, the seat coupling hole and the gasket through hole, the bolt includes a head part and a rod part connected with each other, the rod part passes through the sleeve through hole and includes a threaded segment, and the nut is screwed and fixed on the threaded segment, so that the drum ring, the disc plate, the gasket, the connecting seat and the contact part of the sleeve are clamped between the head of the bolt and the nut.

8. The drum and disc combined brake structure as claimed in claim 1 wherein, The sleeve of the fixing device has two grooves formed on the contact part, each seat coupling hole includes a groove with a groove bottom surface, and the inner edge of the groove bottom surface is accommodated in the groove.

9. The drum and disc combination brake structure as claimed in claim 8 wherein, The sleeve of the fixing device has two opposite mounting planes, and the mounting planes are accommodated in the penetrating hole of the connecting seat.

10. The drum and disc combination brake structure as claimed in claim 8 wherein, The gasket of the fixing device includes two inner hole edges formed in the gasket through hole and matched with the mounting planes of the sleeve.

11. The drum and disc combination brake structure as claimed in claim 10 wherein, The sleeve of the fixing device includes two protrusions respectively formed on the mounting planes, and the protrusions of the sleeve are clamped in the penetrating hole of the connecting seat.

12. The drum and disc combination brake structure as claimed in claim 10 wherein, ​

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