Liquid-cooled double-layer hollow brake drum and drum brake

Abstract

The liquid-cooled double-layer hollow brake drum comprises a brake drum body, a hollow cooling liquid cavity is formed in the brake drum body in the circumferential direction to form the double-layer hollow brake drum, a plurality of supporting partitions are arranged in the cooling liquid cavity, a plurality of through holes which are formed in a staggered mode are formed in the supporting partitions, and the through holes are communicated with the hollow cooling liquid cavity. A sealing end plate is arranged at the opening end of the brake drum body, a sealing ring is arranged between the sealing end plate and the brake drum body, a water inlet hole and an exhaust hole are formed in the upper end portion of the sealing end plate, the position of the water inlet hole is lower than that of the exhaust hole, and the water inlet hole is used for being connected with a cooling liquid box. The cooling device is simple in structure and good in cooling effect, and the cooling cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of motor vehicles, in particular to a liquid-cooled double-layer hollow brake drum and a drum brake. Background Art

[0002] Since the brake drum can provide relatively large frictional braking force, most large trucks use drum brakes for braking. The drum brake mainly consists of components such as a brake drum, brake shoes, friction linings, and brake wheel cylinders. However, the existing brake drums will generate a large amount of heat during braking. If the heat cannot be dissipated in time, it is easy to cause the temperature of the friction linings and the brake drum to be too high, and long-term use will damage the friction linings and the brake drum. Therefore, it is necessary to dissipate the heat of the brake drum. There are three existing heat dissipation methods, namely air cooling, water cooling, and oil cooling.

[0003] For the water-cooled heat dissipation method, such as a drum brake cooling device capable of simultaneously cooling brake shoes and a brake drum with a publication number of: CN 209146189 U, including: a first cooling water channel connected to the brake shoes, a second cooling water channel connected to the brake drum, and a cooling system. The first cooling water channel and the second cooling water channel are both connected to the cooling system to form a circulation loop; an annular groove is provided in the circumferential direction of the brake drum, the second cooling water channel is provided in the annular groove, and a bearing is provided between the second cooling water channel and the annular groove. The inner side of the bearing is in close contact with the bottom of the annular groove, and the outer side of the bearing is in close contact with the second cooling water channel. However, a bearing and a second cooling water channel are provided in the annular groove opened in the brake drum, and the heat of the brake drum is indirectly transferred to the second cooling water channel through the bearing. This cooling effect is poor, and the first cooling water channel and the second cooling water channel form a circulation loop with the cooling system. The water temperature after being cooled by the first cooling water channel is relatively high, thus affecting the cooling efficiency of the second cooling water channel. Summary of the Invention

[0004] The purpose of the utility model is to provide a liquid-cooled double-layer hollow brake drum and a drum brake for the deficiencies of the prior art, with simple structure, good cooling effect, and low cost.

[0005] One of the technical solutions adopted by the purpose of the utility model is:

[0006] A liquid-cooled double-layer hollow brake drum includes a brake drum body. The brake drum body is provided with a hollow coolant cavity along the circumferential direction, forming a double-layer hollow brake drum. A plurality of support partitions are provided in the coolant cavity, and a plurality of staggered through holes are provided on each support partition. A sealing end plate is provided at the open end of the brake drum body, and a sealing ring is provided between the sealing end plate and the brake drum body. An inlet hole and an exhaust hole are provided at the upper end of the sealing end plate, and the inlet hole is used to connect with a coolant tank.

[0007] Furthermore, it also includes an air-cooling cover made of aluminum alloy. The air-cooling cover has a hollow structure and is used to be sleeved on the brake drum body. The inner side wall of the air-cooling cover is in contact with the outer side surface of the brake drum body, and a number of heat dissipation fins are circumferentially distributed on the outer side surface of the air-cooling cover.

[0008] Furthermore, a positioning groove for the sealing ring is provided on the sealing end plate. The sealing ring includes a first sealing ring and a second sealing ring, and the sealing ring adopts an oil seal.

[0009] Furthermore, the wall thickness of the brake drum body is 6 - 15 mm.

[0010] Furthermore, the support partition is arranged transversely along the brake drum body.

[0011] Furthermore, the position of the water inlet hole is lower than the position of the exhaust hole.

[0012] The technical solution adopted for the second object of the present utility model is:

[0013] A double-layer hollow drum brake includes a brake drum and a brake back plate, and further includes a coolant tank. The brake drum adopts the liquid-cooled double-layer hollow brake drum described in any one of the above. The coolant tank is connected to the water inlet hole of the brake drum through a water inlet pipe.

[0014] Furthermore, the coolant tank is installed on the vehicle frame, and the bottom of the coolant tank is higher than the water inlet hole of the brake drum.

[0015] Furthermore, a liquid level gauge is provided on the coolant tank, or a liquid level sensor is provided on the coolant tank.

[0016] Furthermore, the brake back plate is provided with an extending portion extending outward, and the extending portion forms the sealing end plate of the brake drum.

[0017] Adopting the above technical solution has the following beneficial effects:

[0018] The structure of the utility model is simple. The brake drum body is provided with a hollow coolant cavity along the circumferential direction. A number of support partitions are arranged in the coolant cavity, and a plurality of through holes arranged in a staggered manner are formed on each support partition. The support partitions support the coolant cavity, ensuring the strength of the brake drum. Through the through holes arranged in a staggered manner on the partitions, it is convenient for the coolant to circulate in the coolant cavity, directly performing heat exchange to take away the heat of the brake drum, with good cooling effect. At the same time, it effectively avoids the surging of the coolant in the coolant cavity, ensuring uniform heat exchange. The water inlet hole and the exhaust hole opened on the brake backplate, the position of the water inlet hole is lower than that of the exhaust hole, effectively preventing the coolant sent into the coolant cavity of the brake from flowing out through the exhaust hole. The exhaust hole is used to discharge the water vapor generated by evaporation during the cooling exchange. Compared with the use of coolant recycling, the setting of the circulation pump and other electrical components is reduced, and the cost is lowered.

[0019] The sealing ring includes a first sealing ring and a second sealing ring, and the inner and outer seals of the coolant cavity are formed by the first sealing ring and the second sealing ring.

[0020] An air-cooled cover made of aluminum alloy is added. Utilizing the good heat transfer effect of aluminum alloy, further ventilation and heat dissipation are carried out through the heat dissipation fins of the air-cooled cover, further improving the cooling effect.

[0021] The following further explanations are made in conjunction with the drawings and specific implementation manners. Description of the Drawings

[0022] Figure 1 It is the structural schematic diagram of Specific Example 1;

[0023] Figure 2 It is Figure 1 the sectional view taken along line B-B in

[0024] Figure 3 It is Figure 1 the right view in

[0025] Figure 4 It is the structural schematic diagram of the brake drum and the air-cooled cover in Specific Example 2;

[0026] Figure 5 It is the structural schematic diagram of being installed on the axle in Specific Example 2;

[0027] Figure 6 It is the structural schematic diagram of Specific Example 3;

[0028] Figure 7 It is Figure 6 the sectional view taken along line A-A in

[0029] Figure 8 It is Figure 7 the enlarged view at C in

[0030] In the attached drawings, 1 is the brake drum body, 1-1 is the coolant cavity, 2 is the sealing end plate, 2-1 is the water inlet hole, 2-2 is the exhaust hole, 3 is the air-cooling cover, 3-1 is the heat sink, 4 is the support partition, 4-1 is the through hole, 5 is the first sealing ring, 6 is the second sealing ring, and 7 is the axle. Detailed implementation mode

[0031] The following will describe the specific implementation mode of the present utility model in more detail with reference to the schematic diagrams. According to the following description, the advantages and features of the present utility model will be clearer. It should be noted that the attached drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present utility model. It should be understood that the attached drawings of the specification do not necessarily show the specific structure of the present utility model in proportion, and the illustrative features used to explain certain principles of the present utility model in the attached drawings of the specification will also adopt a slightly simplified drawing method. The specific design features of the present utility model disclosed herein, such as specific dimensions, directions, positions, and shapes, will be partially determined by the specific application and usage environment. Also, in the following described embodiments, sometimes the same reference numerals are used commonly between different attached drawings to represent the same parts or parts with the same functions, and the repeated description thereof is omitted. In this specification, similar reference numerals and letters are used to represent similar items. Therefore, once an item is defined in one attached drawing, it does not need to be further discussed in the subsequent attached drawings. Specific embodiment 1:

[0033] See Figures 1 to 3 As shown, a liquid-cooled double-layer hollow brake drum includes a brake drum body 1. The wall thickness of the brake drum body 1 is 6-15 mm. In this specific embodiment: the wall thickness of the brake drum body 1 is 10 mm, ensuring the strength of the brake drum. The brake drum body 1 is circumferentially provided with a hollow coolant cavity 1-1 in a circle, forming a double-layer hollow brake drum. A number of support partitions 4 are provided in the coolant cavity 1-1. The support partitions 4 are arranged transversely along the brake drum body 1. A plurality of through holes 4-1 are provided on each of the support partitions 4 and are arranged in a staggered manner. In this specific embodiment: each support partition 4 is provided with four through holes 4-1, and the through holes 4-1 between the adjacent front and rear support partitions 4 are staggered in the left and right positions. The open end of the brake drum body 1 is provided with a sealing end plate 2. A sealing ring is provided between the sealing end plate 2 and the brake drum body 1. The sealing ring adopts an oil seal. In this specific embodiment: the sealing end plate 2 is provided with a positioning groove for the sealing ring. The sealing ring includes a first sealing ring 5 and a second sealing ring 6. The first sealing ring and the second sealing ring are arranged in the positioning groove for sealing the inner and outer sides of the brake drum body.

[0034] The upper end of the sealed end plate 2 is provided with a water inlet hole 2-1 and an exhaust hole 2-2, and the position of the water inlet hole 2-1 is lower than that of the exhaust hole 2-2. The water inlet hole is used to connect with the coolant tank.

[0035] The working principle of the present utility model: By directly opening a coolant cavity on the brake drum body and adding a support partition in the coolant cavity, the strength of the brake drum is ensured. The coolant circulates in the coolant cavity through the staggered through holes of the support partition to directly cool the brake drum and reduce its temperature. The water vapor after the coolant evaporates is discharged through the exhaust hole, and at the same time, the surging of the coolant in the coolant cavity is avoided. Specific embodiment 2:

[0037] See Figure 4 and Figure 5 As shown, the features of this specific embodiment are: It further includes an air-cooling cover 3 made of aluminum alloy. The air-cooling cover 3 is of a hollow structure. The air-cooling cover 3 is arranged along the circumferential direction of the brake drum body 1. The inner side wall of the air-cooling cover 3 has the same shape as the outer side surface of the brake drum body 1. The air-cooling cover 3 is used to be sleeved on the brake drum body. The inner side wall of the air-cooling cover 3 is in contact with the outer side surface of the brake drum body 1. One side of the air-cooling cover 3 is provided with a mounting portion for mounting on the brake drum body 1, and it is adhered to the brake drum through the mounting portion. The outer side surface of the air-cooling cover 3 is distributed with a plurality of heat dissipation fins 3-1 along the circumferential direction. The heat dissipation fins 3-1 are spirally distributed on the air-cooling cover 3. The height of the heat dissipation fins is 15-30 mm, and the thickness of the air-cooling cover is 3-8 mm. In this specific embodiment: the height of the heat dissipation fins is 20 mm, and the thickness of the air-cooling cover is 5 mm. The heat dissipation effect is the best within this range value. Other features are the same as those in specific embodiment 1, so this specific embodiment is omitted here. Specific embodiment 3:

[0039] See Figures 6 to 8 As shown, a double-layer hollow drum brake includes a brake drum, a brake backing plate and a coolant tank. The drum brake is arranged on the axle 7. The brake drum adopts a liquid-cooled double-layer hollow brake drum described in specific embodiment 1 or specific embodiment 2. The coolant tank is connected to the water inlet hole of the brake backing plate through a water inlet pipe. The coolant tank is installed on the vehicle frame for easy addition of coolant. The bottom of the coolant tank is higher than the water inlet hole of the brake drum. A liquid level gauge is arranged on the coolant tank for observing the coolant in the coolant tank. Or a liquid level sensor is arranged on the coolant tank. The liquid level sensor is electrically connected to the vehicle controller, and the liquid level information is prompted through the display screen of the vehicle controller. The coolant contained in the coolant tank is one of antifreeze, cooling water or cooling oil. In this specific embodiment, the coolant contained in the coolant tank is antifreeze.

[0040] Possibly, the brake backing plate is provided with an extending portion extending outward, and the extending portion forms a sealing end plate 2 of the brake drum. Water inlet holes and exhaust holes are formed on the brake backing plate, and the sealing end plate is replaced by the brake backing plate. In this specific embodiment: the liquid-cooled double-layer hollow brake drum in Specific Embodiment 1 is adopted, and the brake backing plate is used to replace the sealing end plate. Other features are the same as those in Specific Embodiment 1 or Specific Embodiment 2, so this specific embodiment is omitted here.

Claims

1. A liquid-cooled double-layer hollow brake drum, comprising a brake drum body, characterized in that: The brake drum body is provided with a hollow coolant cavity along the circumferential direction, forming a double-layer hollow brake drum. A number of support partitions are arranged in the coolant cavity, and a plurality of through holes are arranged in a staggered manner on each of the support partitions. A sealing end plate is provided at the open end of the brake drum body, and a sealing ring is arranged between the sealing end plate and the brake drum body. Water inlet holes and exhaust holes are arranged at the upper end of the sealing end plate, and the water inlet holes are used to connect with a coolant tank.

2. The liquid-cooled double-layer hollow brake drum according to claim 1, wherein: It further includes an air-cooling cover made of aluminum alloy. The air-cooling cover is of a hollow structure and is used to be sleeved on the brake drum body. The inner side wall of the air-cooling cover is in contact with the outer side surface of the brake drum body, and a number of heat dissipation fins are distributed along the circumferential direction on the outer side surface of the air-cooling cover.

3. The liquid-cooled double-layer hollow brake drum according to claim 1 or 2, characterized in that: A positioning groove for the sealing ring is arranged on the sealing end plate. The sealing ring includes a first sealing ring and a second sealing ring, and the sealing ring adopts an oil seal.

4. The liquid-cooled double-layer hollow brake drum according to claim 1 or 2, characterized in that: The wall thickness of the brake drum body is 6 - 15 mm.

5. The liquid-cooled double-layer hollow brake drum according to claim 1 or 2, characterized in that: The support partitions are arranged along the transverse direction of the brake drum body.

6. The liquid-cooled double-layer hollow brake drum according to claim 1 or 2, characterized in that: The position of the water inlet holes is lower than the position of the exhaust holes.

7. A double-layer hollow drum brake, comprising a brake drum and a brake backing plate, characterized in that: It further includes a coolant tank. The brake drum adopts the liquid-cooled double-layer hollow brake drum according to any one of claims 1 to 6, and the coolant tank is connected to the water inlet holes of the brake drum through a water inlet pipe.

8. The double-layer hollow drum brake according to claim 7, wherein: The coolant tank is installed on the vehicle frame, and the bottom of the coolant tank is higher than the water inlet holes of the brake drum.

9. The double-layer hollow drum brake according to claim 7, characterized in that: A liquid level gauge is arranged on the coolant tank, or a liquid level sensor is arranged on the coolant tank.

10. The double-layer hollow drum brake according to claim 7, wherein: The brake backing plate is provided with an extending portion extending outwards, and the extending portion forms the sealing end plate of the brake drum.

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