Dustproof and sandproof truck brake drum sealing structure

Abstract

This invention provides a dustproof and sandproof truck brake drum sealing structure, belonging to the technical field of truck drum brakes. It includes a brake drum, with an axle fixedly connected to its inner wall and a locating pin fixedly connected to its outer surface. A first sealing groove is formed on the inner wall of the brake drum near the locating pin. A sealing mechanism for sealing is provided on the outer side of the brake drum, including a brake disc. A connecting disc is fixedly connected to the outer wall of the brake disc away from the brake drum. This invention, by setting a tortuous gap between the fixing ring of the brake drum and the second groove of the brake disc, prevents direct contact between the fixing ring and the inner wall of the groove. Utilizing the centrifugal force generated by the rotation of the brake drum, dust entering the tortuous gap can be quickly thrown out, effectively preventing large particles of impurities from intruding into the brake drum. This reduces the possibility of fine sand and dust entering the brake drum through the annular gap between the brake drum and the brake base plate.

Description

Technical Field

[0001] This invention relates to the field of truck drum brake technology, and in particular to a dustproof and sandproof truck brake drum sealing structure. Background Technology

[0002] Drum brakes offer excellent braking performance, low cost, and stable operation, making them the standard braking component for most medium and heavy-duty trucks. This device is widely used in engineering dump trucks, sand and gravel transport trucks, mining trucks, and vehicles traveling on unpaved roads, resulting in a large market application. Utilizing the large frictional contact area between the brake shoes and the brake drum, it can output smooth and sufficient braking torque, meeting the braking needs of heavy-duty vehicles under complex road conditions.

[0003] In summary, medium and heavy-duty trucks often travel on construction sites, mines, and other areas with high wind and sand or muddy roads. External sand and dust can easily enter the brake drum through the annular gap between the brake drum and the brake backing plate, causing abnormal wear between the brake drum and the friction pads. Existing solutions often use a clip-on dust cover, which is installed at the brake drum port. However, there is still an assembly gap between the dust cover and the brake drum. Fine sand particles and dust can still enter the brake drum through this gap, leading to abnormal wear of the brake drum and brake friction pads, which in turn affects braking performance and driving safety.

[0004] Therefore, this application provides a dustproof and sandproof truck brake drum sealing structure to meet the requirements. Summary of the Invention

[0005] The purpose of this invention is to provide a dustproof and sandproof truck brake drum sealing structure to solve the above-mentioned problems. The fixing ring on the outer wall of the brake drum slides in the second groove of the brake disc. Since there is a non-contact gap between the fixing ring and the second groove, the centrifugal force generated when the brake drum rotates can throw out the dust mixed in the gap and prevent large particles of impurities from entering the interior of the brake drum. At the same time, when the axle rotates at high speed, the air passage opened on the surface of the fixing bracket on the outer side of the axle accelerates the airflow in the narrow section, creating a negative pressure on the side of the air passage near the double-lip oil seal. This actively sucks up the fine dust trapped in the gap on the outer side of the double-lip oil seal and throws it away under the action of centrifugal force, avoiding the accumulation of dust at the interface between the oil seal and the axle. This reduces the possibility that fine sand and dust can enter the interior of the brake drum from the annular gap between the brake drum and the brake base plate, thus solving the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A dustproof and sandproof truck brake drum sealing structure includes a brake drum, an axle fixedly connected to the inner wall of the brake drum, a positioning pin fixedly connected to the outer surface of the brake drum, a first sealing groove formed on the inner wall of the brake drum near the positioning pin, and a sealing mechanism for sealing on the outer side of the brake drum.

[0007] Optionally, the sealing mechanism includes a brake disc, with a connecting disc fixedly connected to the outer wall of the brake disc on the side away from the brake drum. The outer surface of the connecting disc is arc-shaped, so that dust is thrown outward under the influence of the air passage, effectively preventing dust from accumulating in the mating gap between the double-lip oil seal and the axle. A double-lip oil seal is fixedly connected to the inner wall of the brake disc on the side near the connecting disc. The inner wall of the double-lip oil seal is movably sleeved on the outer surface of the axle. A positioning groove is provided on one outer wall of the brake disc. A bearing assembly is provided on the side of the brake disc away from the brake drum. The bearing assembly includes an outer ring and an inner ring, with rolling elements rolling between the outer ring and the inner ring. A first sealing ring is fixedly connected between the inner ring and the brake disc.

[0008] Optionally, the outer surface of the outer ring is provided with a first positioning hole, which is movably fitted onto the outer surface of the positioning pin. The outer ring rotates synchronously with the brake drum, and the outer surface of the outer ring is provided with a second sealing groove.

[0009] Optionally, a positioning block is fixedly connected to the inner wall of the inner ring, and the positioning block and the positioning groove are engaged to keep the inner ring fixed relative to the brake disc.

[0010] Optionally, a sealing plate is detachably connected to the outer wall of the outer ring away from the brake drum. A third sealing groove is formed on the outer surface of the sealing plate. The end of the sealing plate away from the outer ring is accommodated inside the inner ring, and a gap is left between the sealing plate and the inner wall of the inner ring. The sealing plate rotates synchronously with the outer ring. A small gap is provided between the mating surfaces of the sealing plate and the inner ring to avoid friction and temperature rise when the sealing plate and the inner ring move relative to each other. The sealing plate is used to block the gap between the outer ring and the inner ring near the outside.

[0011] Optionally, a second sealing ring is detachably connected to the outer surface of the outer ring, and a baffle is detachably connected to the outer wall of the second sealing ring. A fourth sealing groove is formed on the inner wall of the baffle near the second sealing ring.

[0012] Optionally, a second positioning hole is provided on the outer surface of the second sealing ring, and the opening position of the second positioning hole is the same as that of the first positioning hole, so that the second sealing ring rotates synchronously with the outer ring.

[0013] Optionally, the outer surface of the second sealing ring is fixedly connected with a first sealing lip and a second sealing lip. The first sealing lip and the second sealing lip are annular elastic structures protruding from the outer surface of the second sealing ring. The two outer surfaces of the first sealing lip are respectively engaged with the inner walls of the first sealing groove and the second sealing groove, and the two outer surfaces of the second sealing lip are respectively engaged with the inner walls of the third sealing groove and the fourth sealing groove.

[0014] Optionally, a fixing ring is fixedly connected to the outer wall of the brake drum near the locating pin, and a second groove is formed on the outer surface of the brake disc near the fixing ring. The fixing ring is accommodated in the second groove, and a gap is left between the fixing ring and the inner wall of the second groove.

[0015] Optionally, a heat sink is fixedly connected to the outer surface of the brake drum. The outer surface of the heat sink has a first groove. The heat sinks are arranged in an array along the circumference and axial direction of the brake drum. Their cross-section is teardrop-shaped, and the gap between adjacent heat sinks is a gradually changing structure from narrow to wide.

[0016] Optionally, a fixing frame is fixedly connected to the outer wall of the axle near the double-lip oil seal. An air passage is opened on the outer surface of the fixing frame. The narrow section in the middle of the air passage increases the air flow rate and creates a negative pressure on the side of the air passage near the axle, thereby sucking up dust near the gap on the outer side of the double-lip oil seal. The diameters at both ends of the air passage are larger than the diameter of the middle area. The fixing frame rotates synchronously with the axle, and the air passage is evenly distributed along the circumference of the fixing frame.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: In the above-mentioned solution, the dustproof and sandproof truck brake drum sealing structure provided in this application sets a tortuous gap between the fixing ring of the brake drum and the second groove of the brake disc, so that the fixing ring and the inner wall of the groove are not in direct contact. By utilizing the centrifugal force generated by the rotation of the brake drum, the dust entering the tortuous gap can be quickly thrown out, effectively preventing large particles of impurities from entering the interior of the brake drum, thereby reducing the possibility that fine sand particles and dust can enter the interior of the brake drum from the annular gap between the brake drum and the brake base plate.

[0018] By setting up a bearing assembly, the frictional resistance when the brake drum and brake base plate rotate relative to each other can be reduced, thereby avoiding the problem of frictional heat generation between the two. At the same time, the outer side of the second sealing ring is provided with a first sealing lip and a second sealing lip to seal and protect the gaps between the bearing assembly, the brake drum and the brake base plate, thereby extending the service life of the bearing assembly.

[0019] Meanwhile, by setting up a fixed frame and the air passage on the inner wall of the fixed frame, when the axle rotates, the reduced diameter section causes the airflow speed to increase sharply, and a negative pressure area is formed on the side near the double lip oil seal. This actively sucks up the dust accumulated in the gap on the outside of the double lip oil seal, avoiding the accumulation of dust in the precision fit gap between the double lip oil seal and the axle, and improving the service life of the double lip oil seal. Attached Figure Description

[0020] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the invention and, together with the specification, further serve to explain the principles of the invention and enable those skilled in the art to practice and use the invention.

[0021] Figure 1 This is a schematic diagram of the overall front structure of the present invention; Figure 2 This is a schematic diagram of the overall rear structure of the present invention; Figure 3 This is a top view of the overall structure of the present invention; Figure 4 This is a schematic diagram of the overall front cross-sectional structure of the present invention; Figure 5 This is a schematic diagram of the brake drum structure of the present invention; Figure 6 This is a schematic diagram of the overall structure of the sealing mechanism of the present invention; Figure 7 This is an exploded view of the sealing mechanism of the present invention; Figure 8 For the present invention Figure 4 A magnified structural diagram of A in the middle; Figure 9 For the present invention Figure 4 A magnified structural diagram of B in the diagram.

[0022] Figure label: 1. Brake drum; 101. Locating pin; 102. First sealing groove; 103. Retaining ring; 2. Axle; 3. Heat sink block; 4. First groove; 5. Sealing mechanism; 51. Brake disc; 511. Connecting disc; 52. Second groove; 53. Locating groove; 54. Bearing assembly; 541. Outer ring; 542. First positioning hole; 543. Second sealing groove; 544. Inner ring; 545. Locating block; 546. Sealing plate; 547. Third sealing groove; 548. First sealing ring; 549. Rolling element; 55. Second sealing ring; 551. Second positioning hole; 552. First sealing lip; 553. Second sealing lip; 56. Baffle; 561. Fourth sealing groove; 57. Double-lip oil seal; 6. Fixing bracket; 601. Air passage.

[0023] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0024] The dustproof and sandproof truck brake drum sealing structure provided by the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0025] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0026] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0027] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0028] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0029] like Figures 1 to 3 As shown, an embodiment of the present invention provides a dustproof and sandproof truck brake drum sealing structure, including a brake drum 1, an axle 2 fixedly connected to the inner wall of the brake drum 1, a positioning pin 101 fixedly connected to the outer surface of the brake drum 1, a first sealing groove 102 opened on the inner wall of the brake drum 1 near the positioning pin 101, and a sealing mechanism 5 for sealing is provided on the outer side of the brake drum 1.

[0030] A heat sink 3 is fixedly connected to the outer surface of the brake drum 1. A first groove 4 is provided on the outer surface of the heat sink 3. The heat sink 3 is arranged in an array along the circumference and axial direction of the brake drum 1. Its cross-section is teardrop-shaped. The gap between adjacent heat sinks 3 is a gradually changing structure from narrow to wide. When the brake drum 1 is running, a flowing airflow is formed on the surface. When the airflow enters the area of ​​the heat sink 3, the airflow speed increases because the gap at the front end of the adjacent heat sink 3 is small. When the airflow passes the head of the heat sink 3, the gap between the adjacent heat sinks 3 gradually widens and the airflow speed gradually decreases.

[0031] By dynamically changing the airflow velocity, the heat exchange capacity of the heat sink 3 surface can be effectively improved. At the same time, by opening the first groove 4 on the outer surface of the heat sink 3, the heat dissipation area can be effectively increased. By staggering the distribution of the heat sinks 3 between adjacent rows, short circuits in the airflow can be avoided, making the brake drum 1 cool evenly, suppressing the temperature rise of the brake drum 1 under braking conditions, and preventing the seals from aging and failing due to the high temperature of the brake drum 1.

[0032] like Figure 5 and Figure 9As shown, a fixing ring 103 is fixedly connected to the outer wall of the brake drum 1 near the positioning pin 101. A second groove 52 is formed on the outer surface of the brake disc 51 near the fixing ring 103. The fixing ring 103 is accommodated in the second groove 52, and a gap is left between the fixing ring 103 and the inner wall of the second groove 52. A tortuous gap is provided between the fixing ring 103 and the second groove 52 to avoid contact between the fixing ring 103 and the inner wall of the second groove 52. This avoids the problem of friction and heat generation caused by relative rotation between the fixing ring 103 and the brake disc 51 when the brake drum 1 is running. At the same time, the centrifugal force generated when the brake drum 1 is rotating will throw out the dust that enters between the fixing ring 103 and the second groove 52, effectively blocking the entry of coarse particles of impurities into the interior of the brake drum 1.

[0033] A fixing frame 6 is fixedly connected to the outer wall of the axle 2 near the double-lip oil seal 57. An air passage 601 is opened on the outer surface of the fixing frame 6. The diameters at both ends of the air passage 601 are larger than the diameter of the middle area. When the axle 2 rotates, the reduced diameter section in the middle of the air passage 601 increases the airflow speed and creates a negative pressure on the side of the air passage 601 near the axle 2. This can draw in dust near the gap on the outer side of the double-lip oil seal 57. The dust is transported along the air passage 601 to the connecting plate 511. Relying on the arc-shaped outer surface of the connecting plate 511, the dust is thrown outward under inertia, effectively preventing dust from accumulating in the mating gap between the double-lip oil seal 57 and the axle 2.

[0034] In this embodiment, as Figures 4 to 8 As shown, the sealing mechanism 5 includes a brake disc 51. A connecting disc 511 is fixedly connected to the outer wall of the brake disc 51 on the side away from the brake drum 1. A double-lip oil seal 57 is fixedly connected to the inner wall of the brake disc 51 on the side near the connecting disc 511. The inner wall of the double-lip oil seal 57 is movably sleeved on the outer surface of the axle 2. The double-lip oil seal 57 is made of fluororubber, which has the characteristics of high temperature resistance and wear resistance. A positioning groove 53 is opened on one side of the outer wall of the brake disc 51. A bearing assembly 54 is provided on the side of the brake disc 51 away from the brake drum 1. Figure 7 As shown, the bearing assembly 54 includes an outer ring 541 and an inner ring 544. A rolling element 549 is rolled between the outer ring 541 and the inner ring 544. A first sealing ring 548 is fixedly connected between the inner ring 544 and the brake disc 51. The first sealing ring 548 seals the gap between the inner ring 544 and the brake disc 51 to prevent external dust from entering the interior of the bearing assembly 54 through the gap.

[0035] The outer surface of the outer ring 541 is provided with a first positioning hole 542, which is movably fitted onto the outer surface of the positioning pin 101. The outer ring 541 rotates synchronously with the brake drum 1. The outer surface of the outer ring 541 is provided with a second sealing groove 543.

[0036] The inner wall of the inner ring 544 is fixedly connected to a positioning block 545. Through the insertion and engagement of the positioning block 545 with the positioning groove 53, the inner ring 544 can be kept fixed relative to the brake disc 51, so that when the brake drum 1 and the outer ring 541 rotate, the inner ring 544 and the brake disc 51 do not rotate with it.

[0037] like Figure 8 As shown, a sealing plate 546 is detachably connected to the outer wall of the outer ring 541 on the side away from the brake drum 1. A third sealing groove 547 is provided on the outer surface of the sealing plate 546. The end of the sealing plate 546 away from the outer ring 541 is accommodated inside the inner ring 544. The sealing plate 546 rotates synchronously with the outer ring 541. A small gap is provided between the mating surfaces of the sealing plate 546 and the inner ring 544 to avoid friction and temperature rise when relative movement occurs between the sealing plate 546 and the inner ring 544. A second sealing ring 55 is detachably connected to the outer surface of the outer ring 541. A baffle 56 is detachably connected to the outer wall of the second sealing ring 55. A fourth sealing groove 561 is provided on the inner wall of the baffle 56 on the side near the second sealing ring 55.

[0038] The outer surface of the second sealing ring 55 is provided with a second positioning hole 551. The opening position of the second positioning hole 551 is the same as that of the first positioning hole 542. The second sealing ring 55 rotates synchronously with the outer ring 541. The second sealing ring 55 is made of an elastic material. It is assembled and positioned with the positioning pin 101 through the second positioning hole 551, so that the second sealing ring 55 rotates synchronously with the brake drum 1 and the outer ring 541, effectively avoiding relative friction between the brake drum 1 and the outer ring 541.

[0039] The outer surface of the second sealing ring 55 is fixedly connected to a first sealing lip 552 and a second sealing lip 553. After the second sealing ring 55 is installed in place, the first sealing lip 552 is squeezed by the first sealing groove 102 and the second sealing groove 543. It fills the first sealing groove 102 and the second sealing groove 543 through its own elastic deformation, preventing dust from entering the interior through the gap between the brake drum 1 and the outer ring 541. The second sealing lip 553 is located between the third sealing groove 547 and the fourth sealing groove 561 to prevent dust from entering the interior of the brake drum 1 from the gap between the outer ring 541 and the inner ring 544.

[0040] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0041] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dustproof and sandproof truck brake drum sealing structure, comprising a brake drum (1), wherein an axle (2) is fixedly connected to the inner wall of the brake drum (1), a positioning pin (101) is fixedly connected to the outer surface of the brake drum (1), and a first sealing groove (102) is provided on the inner wall of the brake drum (1) near the positioning pin (101), characterized in that, The brake drum (1) is provided with a sealing mechanism (5) for sealing on its outer side. The sealing mechanism (5) includes a brake disc (51), a connecting disc (511) is fixedly connected to the outer wall of the brake disc (51) away from the brake drum (1), a double-lip oil seal (57) is fixedly connected to the inner wall of the brake disc (51) near the connecting disc (511), the inner wall of the double-lip oil seal (57) is movably sleeved on the outer surface of the axle (2), a positioning groove (53) is provided on one outer wall of the brake disc (51), a bearing assembly (54) is provided on the side of the brake disc (51) away from the brake drum (1), the bearing assembly (54) includes an outer ring (541) and an inner ring (544), a rolling element (549) is rolled between the outer ring (541) and the inner ring (544), and a first sealing ring (548) is fixedly connected between the inner ring (544) and the brake disc (51).

2. The dustproof and sandproof truck brake drum sealing structure according to claim 1, characterized in that, The outer ring (541) has a first positioning hole (542) on its outer surface. The first positioning hole (542) is movably sleeved on the outer surface of the positioning pin (101). The outer ring (541) rotates synchronously with the brake drum (1). The outer surface of the outer ring (541) has a second sealing groove (543).

3. The dustproof and sandproof truck brake drum sealing structure according to claim 1, characterized in that, The inner wall of the inner ring (544) is fixedly connected to a positioning block (545), which is movably inserted into the inner wall of the positioning groove (53) to prevent the inner ring (544) from rotating.

4. The dustproof and sandproof truck brake drum sealing structure according to claim 1, characterized in that, A sealing plate (546) is detachably connected to the outer wall of the outer ring (541) away from the brake drum (1). A third sealing groove (547) is provided on the outer surface of the sealing plate (546). The end of the sealing plate (546) away from the outer ring (541) is accommodated inside the inner ring (544), and a gap is left between the sealing plate (546) and the inner wall of the inner ring (544). The sealing plate (546) is used to cover the gap between the outer ring (541) and the inner ring (544) near the outside.

5. The dustproof and sandproof truck brake drum sealing structure according to claim 4, characterized in that, The outer surface of the outer ring (541) is detachably connected to a second sealing ring (55), and the outer wall of the second sealing ring (55) is detachably connected to a baffle (56). The inner wall of the baffle (56) near the second sealing ring (55) is provided with a fourth sealing groove (561).

6. The dustproof and sandproof truck brake drum sealing structure according to claim 5, characterized in that, The outer surface of the second sealing ring (55) is provided with a second positioning hole (551). The opening position of the second positioning hole (551) is the same as that of the first positioning hole (542). The second sealing ring (55) rotates synchronously with the outer ring (541).

7. The dustproof and sandproof truck brake drum sealing structure according to claim 5, characterized in that, The outer surface of the second sealing ring (55) is fixedly connected with a first sealing lip (552) and a second sealing lip (553). The outer surfaces of the two sides of the first sealing lip (552) are respectively engaged with the inner walls of the first sealing groove (102) and the second sealing groove (543). The outer surfaces of the two sides of the second sealing lip (553) are respectively engaged with the inner walls of the third sealing groove (547) and the fourth sealing groove (561).

8. The dustproof and sandproof truck brake drum sealing structure according to claim 1, characterized in that, A fixing ring (103) is fixedly connected to the outer wall of the brake drum (1) near the positioning pin (101). A second groove (52) is opened on the outer surface of the brake disc (51) near the fixing ring (103). The fixing ring (103) is accommodated in the second groove (52), and a gap is left between the fixing ring (103) and the inner wall of the second groove (52).

9. The dustproof and sandproof truck brake drum sealing structure according to claim 1, characterized in that, The outer surface of the brake drum (1) is fixedly connected to a heat sink (3), and the outer surface of the heat sink (3) is provided with a first groove (4). The cross-section of the heat sink (3) is teardrop-shaped, and the heat sinks (3) in adjacent rows are staggered.

10. The dustproof and sandproof truck brake drum sealing structure according to claim 1, characterized in that, A fixing bracket (6) is fixedly connected to the outer wall of the axle (2) near the double-lip oil seal (57). An air passage (601) is opened on the outer surface of the fixing bracket (6). The diameters at both ends of the air passage (601) are larger than the diameter of the middle area.

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