Drive axle wet brake structure and harvester rear drive axle

Abstract

The utility model provides a kind of wet brake structure for drive axle and harvesting machinery rear drive axle, wet brake structure for drive axle includes first axle housing, second axle housing and transmission shaft, first axle housing and second axle housing fixed connection and intercommunication, the transmission shaft is through first axle housing and second axle housing;Second axle housing is equipped with brake piston, brake piston and first axle housing between being equipped with first brake pad and second brake pad, first brake pad is transmission coupling with transmission shaft and can slide along the axial direction of transmission shaft, brake piston and second axle housing between being equipped with brake fluid cavity, brake fluid cavity is used for oil liquid to enter and promote brake piston to first brake pad movement.The utility model is adopted, by brake piston and move along axial direction and compress brake pad, realize the brake of transmission shaft, save space;Without changing the overall layout of drive axle, it is convenient to increase rear axle brake function on harvesting machinery.

Description

Technical Field

[0001] This utility model relates to the field of rear drive axle technology for harvesting machinery, specifically to a wet braking structure for a drive axle and a rear drive axle for harvesting machinery. Background Technology

[0002] Harvesting machinery typically relies on front axle braking for travel. However, with increasing vehicle load and transfer speeds, front axle braking becomes insufficient for braking requirements during slopes and transfers, sometimes necessitating the addition of rear axle braking. Currently, harvesting machinery typically uses drum or disc brakes located at the wheel wells. Existing four-wheel-drive harvesting machinery, due to initial design flaws, lacks pre-designed mounting positions for conventional brakes on the rear drive axle, making it difficult to meet braking requirements with drum or disc brakes. Utility Model Content

[0003] To solve at least one of the above technical problems, this utility model provides a wet braking structure for a drive axle and a rear drive axle for harvesting machinery.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This utility model provides a wet braking structure for a drive axle, including a first axle housing, a second axle housing, and a drive shaft. The first and second axle housings are fixedly connected and interconnected, and the drive shaft passes through the first and second axle housings. A brake piston is provided inside the second axle housing, and a first brake pad and a second brake pad are provided between the brake piston and the first axle housing. The first brake pad is driven by the drive shaft and can slide along the axial direction of the drive shaft. A brake fluid chamber is provided between the brake piston and the second axle housing, which is used to supply oil and push the brake piston toward the first brake pad.

[0005] The beneficial effects of this utility model are: This invention utilizes oil entering the brake fluid chamber to drive the brake piston to move axially, pressing the first and second brake pads to achieve braking of the drive shaft, saving space. The structure of the first axle housing, the second axle housing, and the drive shaft is matched with the drive axle of the harvesting machinery, thus this braking structure is suitable for braking the drive shaft of the drive axle without changing the overall layout of the drive axle, resulting in low implementation costs. It also facilitates the addition of rear axle braking function to harvesting machinery, avoiding the problem that a single front brake cannot meet the needs of special scenarios.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the brake piston has a first step on its outer periphery at the center, and the second axle housing has a second step on its inner wall. The end of the first step away from the first brake pad and the second step form an annular brake fluid cavity.

[0008] The brake fluid chamber is formed by the first step, the second step, the outer wall of the brake piston, and the inner wall of the second axle housing, which has good sealing performance and avoids interference between the brake fluid chamber and the drive shaft in terms of movement space; and the thrust on the brake piston is uniform, resulting in good reliability.

[0009] Furthermore, a first sealing ring is fitted around the outer periphery of the first step, and a second sealing ring is fitted around the outer periphery of the end of the brake piston away from the first brake pad. Both the first and second sealing rings are in sealing contact with the inner wall of the second axle housing.

[0010] It facilitates the improvement of the sealing of the brake fluid chamber, prevents oil leakage, and ensures good braking reliability.

[0011] Furthermore, the inner wall of the second bridge housing is provided with an annular sealing groove, and the first sealing ring and the second sealing ring are respectively embedded in the corresponding sealing groove.

[0012] This prevents the sealing ring from moving with the brake piston, thus extending the service life of the sealing ring.

[0013] Furthermore, the second axle housing is also equipped with a reset component that can drive the brake piston to reset when the brake fluid chamber returns oil.

[0014] When the brake is released, the reset component causes the brake piston to separate from the brake pads, and at the same time, it can provide pressure to return oil to the brake fluid chamber, which improves the brake release response speed and reduces mechanical wear.

[0015] Furthermore, the reset component includes a mounting cylinder, in which a reset shaft is slidably connected. One end of the reset shaft is fixedly connected to the end of the brake piston away from the first sealing ring, and the other end of the reset shaft is fixedly fixed with a limiting member. A compression spring is provided between the limiting member and the end of the mounting cylinder, and the compression spring is sleeved on the reset shaft. The mounting cylinder is fixedly connected to the second bridge housing.

[0016] When the brake fluid chamber is filled with oil, the brake piston drives the reset shaft to move along the first sealing ring. The limiting member at the end of the reset shaft and the end of the mounting cylinder together compress the spring, and the compressed spring stores energy. When the brake fluid chamber returns oil, the elastic force of the compressed spring is transmitted to the brake piston through the limiting member and the reset shaft, thereby causing the brake piston to separate from the brake pads. At the same time, it can provide pressure for the return of oil to the brake fluid chamber, which improves the brake release response speed. Moreover, the structure is simple, the cost is low, and the space occupied is small.

[0017] Furthermore, one end of the reset shaft is threadedly connected to the end of the brake piston away from the first sealing ring.

[0018] It is easy to adjust the length of the reset shaft extending into the brake piston, and has good adaptability.

[0019] Furthermore, the limiting member is a locking nut and is threadedly connected to the reset shaft. A washer is also fixed at the end of the mounting cylinder. The washer is in contact with the reset shaft. One end of the compression spring abuts against the limiting member, and the other end abuts against the washer.

[0020] The locking nut allows for easy adjustment of the pre-compression of the compression spring, and the return force is adjustable, providing good adaptability. The washer prevents the compression spring from entering the gap inside the mounting cylinder, ensuring high reliability.

[0021] Furthermore, both the first brake pad and the second brake pad are annular. The first brake pad is connected to the drive shaft via a spline, and there is a gap between the second brake pad and the drive shaft. The outer periphery of the second brake pad is in rotatable contact with the inside of the first axle housing.

[0022] The first brake pad is connected to the drive shaft via a spline, ensuring that the first brake pad can slide smoothly along the drive shaft; the outer periphery of the second brake pad is in rotational contact with the inside of the first axle housing, preventing the second brake pad from moving radially and ensuring the stable sliding and rotation of the second brake pad.

[0023] The friction between the first brake pad and the second brake pad facilitates the provision of braking friction resistance; at the same time, multiple first brake pads can share the friction force, reducing the stress concentration on the outside of the drive shaft during braking.

[0024] This utility model provides a rear drive axle for harvesting machinery, including a central drive assembly, with bridge tube assemblies installed at both ends of the central drive assembly, and a wet braking structure for the drive axle provided between the central drive assembly and the bridge tube assemblies.

[0025] It enables braking of the drive shaft, making it easier to add rear axle braking function to harvesting machinery and avoiding the problem that a single front brake cannot meet the needs of special scenarios. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the wet braking structure for the drive axle of this utility model.

[0027] Figure 2 This is a schematic diagram of the reset component.

[0028] Figure 3 This is a schematic diagram of the rear drive axle of the harvesting machinery of this utility model.

[0029] In the accompanying drawings, the technical features represented by each reference numeral are as follows: 1-First axle housing; 2-Second axle housing; 3-Brake piston; 4-Drive shaft; 5-First brake pad; 6-Second brake pad; 7-Brake fluid chamber; 8-First sealing ring; 9-Second sealing ring; 10-Reset component; 11-Mounting cylinder; 12-Reset shaft; 13-Limiting component; 14-Compression spring; 15-Washer; 20 - Central drive assembly; 21 - Bridge tube assembly; 22 - Cylindrical pin; 23 - Hole retaining ring; 24 - Spline sleeve. Detailed Implementation

[0030] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0031] This utility model refers to Figure 1-3 .

[0032] Example 1, as Figure 1-2 As shown: This utility model provides a wet braking structure for a drive axle, including a first axle housing 1, a second axle housing 2, and a drive shaft 4. The first axle housing 1 and the second axle housing 2 are fixedly connected and interconnected. The drive shaft 4 passes through the first axle housing 1 and the second axle housing 2. A brake piston 3 is provided inside the second axle housing 2. A first brake pad 5 and a second brake pad 6 are provided between the brake piston 3 and the first axle housing 1. The first brake pad 5 is connected to the drive shaft 4 and can slide along the axial direction of the drive shaft 4. A brake fluid chamber 7 is provided between the brake piston 3 and the second axle housing 2. The brake fluid chamber 7 is used to supply oil and push the brake piston 3 toward the first brake pad 5.

[0033] principle: During braking, the external hydraulic system supplies oil to the brake fluid chamber 7. The oil enters the brake fluid chamber 7 and pushes the brake piston 3 towards the first brake pad 5 and the second brake pad 6. The brake piston 3 presses the first brake pad 5 and the second brake pad 6 against the first axle housing 1. Since the first brake pad 5 rotates with the drive shaft 4, friction is generated between the first axle housing 1, the first brake pad 5, and the second brake pad 6. The frictional resistance is transmitted to the drive shaft 4 through the first brake pad 5, thus braking the drive shaft 4. When braking ends, the external hydraulic system returns oil, and the oil in the brake fluid chamber 7 is discharged. The brake piston 3 can be reset by the elasticity of the first brake pad 5 and the second brake pad 6, or a reset structure can be added to the second axle housing 2. The reset structure drives the brake piston 3 to reset, separating the brake piston 3 from the first brake pad 5 and the second brake pad 6. The friction disappears, and the first brake pad 5 rotates with the drive shaft 4 or remains stationary. The oil supply and return of the external hydraulic system can be controlled by the brake pedal and a multi-way valve. The brake hydraulic system is existing technology. The first axle housing 1 and the second axle housing 2 can respectively adopt the housing of the central transmission assembly 20 and the housing of the axle tube assembly 21 of the rear drive axle of existing harvesting machinery. The central transmission assembly 20 and the axle tube assembly 21 are connected to each other, and both belong to the prior art.

[0034] By employing this invention, oil enters the brake fluid chamber 7, driving the brake piston 3 to move axially and press the first brake pad 5 and the second brake pad 6, thereby achieving braking of the drive shaft 4 and saving space. The structure of the first axle housing 1, the second axle housing 2, and the drive shaft 4 is matched with the drive axle of the harvesting machinery, thus this braking structure is suitable for braking the drive shaft 4 of the drive axle without changing the overall layout of the drive axle, resulting in low implementation costs. It also facilitates the addition of a rear axle braking function to the harvesting machinery, avoiding the problem that a single front brake cannot meet the needs of special scenarios.

[0035] Furthermore, the brake piston 3 has a first step on its outer periphery in the middle, and the second bridge housing 2 has a second step on its inner wall. The end of the first step away from the first brake pad 5 and the second step form an annular brake fluid cavity 7.

[0036] The brake fluid chamber 7, which is formed by the first step, the second step, the outer wall of the brake piston 3, and the inner wall of the second axle housing 2, has good sealing performance and avoids interference between the brake fluid chamber 7 and the drive shaft 4 in terms of movement space; and the thrust on the brake piston 3 is uniform and reliable.

[0037] Furthermore, a first sealing ring 8 is fitted around the outer periphery of the first step, and a second sealing ring 9 is fitted around the outer periphery of the end of the brake piston 3 away from the first brake pad 5. Both the first sealing ring 8 and the second sealing ring 9 are in sealing contact with the inner wall of the second axle housing 2.

[0038] Preferably, the first sealing ring 8 and the second sealing ring 9 are X-shaped sealing rings.

[0039] This facilitates improved sealing of the brake fluid chamber 7, prevents fluid leakage, and ensures good braking reliability.

[0040] Furthermore, the inner wall of the second bridge housing 2 is provided with an annular sealing groove, and the first sealing ring 8 and the second sealing ring 9 are respectively embedded in the corresponding sealing groove.

[0041] This prevents the sealing ring from moving with the brake piston 3, thus extending the service life of the sealing ring.

[0042] Furthermore, the second axle housing 2 is also equipped with a reset component 10 that can drive the brake piston 3 to reset when the brake fluid chamber 7 returns oil.

[0043] When the brake is released, the reset component 10 drives the brake piston 3 to separate from the brake pads, and at the same time provides pressure to return oil to the brake fluid chamber 7, which improves the brake release response speed and reduces mechanical wear.

[0044] Furthermore, such as Figure 2As shown: The reset component 10 includes a mounting cylinder 11, a reset shaft 12 is slidably connected inside the mounting cylinder 11, one end of the reset shaft 12 is fixedly connected to the end of the brake piston 3 away from the first sealing ring 8, and the other end of the reset shaft 12 is fixedly fixed with a limiting member 13. A compression spring 14 is provided between the limiting member 13 and the end of the mounting cylinder 11, and the compression spring 14 is sleeved on the reset shaft 12; the mounting cylinder 11 is fixedly connected to the second bridge housing 2.

[0045] When the brake fluid chamber 7 is filled with oil, the brake piston 3 drives the reset shaft 12 to move toward the first sealing ring 8. The limiting member 13 at the end of the reset shaft 12 and the end of the mounting cylinder 11 together compress the spring 14, and the spring 14 stores energy. When the brake fluid chamber 7 is filled with oil, the elastic force of the spring 14 is transmitted to the brake piston 3 through the limiting member 13 and the reset shaft 12, thereby causing the brake piston 3 to separate from the brake pads. At the same time, it can provide pressure for the return of oil to the brake fluid chamber 7, which improves the brake release response speed. Moreover, the structure is simple, the cost is low, and the space occupied is small.

[0046] Furthermore, one end of the reset shaft 12 is connected to the end of the brake piston 3 away from the first sealing ring 8 by a thread.

[0047] It is easy to adjust the length of the reset shaft 12 extending into the brake piston 3, and has good adaptability.

[0048] Furthermore, the limiting member 13 is a locking nut and is threadedly connected to the reset shaft 12. A washer 15 is also fixed at the end of the mounting cylinder 11. The washer 15 is in contact with the reset shaft 12. One end of the compression spring 14 abuts against the limiting member 13, and the other end abuts against the washer 15.

[0049] The pre-compression degree of the compression spring 14 can be easily adjusted by tightening the lock nut, and the reset force is adjustable, making it highly adaptable. The washer 15 can prevent the compression spring 14 from entering the gap inside the mounting cylinder 11, ensuring high reliability.

[0050] Furthermore, such as Figure 1 As shown: Both the first brake pad 5 and the second brake pad 6 are annular. The first brake pad 5 is connected to the drive shaft 4 by a spline. There is a gap between the second brake pad 6 and the drive shaft 4. The outer periphery of the second brake pad 6 is in rotatable contact with the inside of the first axle housing 1.

[0051] The first brake pad 5 is connected to the drive shaft 4 via a spline, ensuring that the first brake pad 5 can slide smoothly along the drive shaft 4; the outer periphery of the second brake pad 6 is in rotational contact with the inside of the first axle housing 1, preventing the second brake pad 6 from moving radially and ensuring the stable sliding and rotation of the second brake pad 6.

[0052] Preferably, the first brake pad 5 is one more than the second brake pad 6, and the first brake pad 5 and the second brake pad 6 are arranged alternately along the axial direction.

[0053] The friction between the first brake pad 5 and the second brake pad 6 facilitates the provision of braking friction resistance; at the same time, multiple first brake pads 5 can share the friction force, reducing the stress concentration on the outside of the drive shaft 4 during braking.

[0054] Example 2, as Figure 3 As shown: This utility model provides a rear drive axle for a harvesting machine, including a central drive assembly 20, with bridge tube assemblies 21 installed at both ends of the central drive assembly 20, and the aforementioned wet braking structure for the drive axle is provided between the central drive assembly 20 and the bridge tube assembly 21.

[0055] Note: The first axle housing 1 is the housing of the axle tube assembly 21, and the second axle housing 2 is the housing of the central drive assembly 20. The drive shaft 4 consists of two sections: one is the input shaft of the axle tube assembly 21, and the other is the output shaft of the central drive assembly 20. The two sections of the drive shaft 4 are coaxially connected by a cylindrical pin 22. The two sections of the drive shaft 4 are connected by a spline sleeve 24, and a flexible retaining ring 23 with a hole is fixed in the middle of the inner side of the spline sleeve 24.

[0056] The braking of the drive shaft 4 is realized, which makes it easier to add a rear axle braking function to harvesting machinery and avoids the problem that a single front brake cannot meet the needs of special scenarios.

[0057] In the description of this utility model, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this utility model and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0058] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this utility model, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixing," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixing" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.

[0060] In this utility model, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood according to the specific circumstances, the context, and the coherence of the preceding and following text.

[0061] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.

Claims

1. A wet braking structure for a drive axle, characterized in that: The device includes a first axle housing (1), a second axle housing (2), and a drive shaft (4). The first axle housing (1) and the second axle housing (2) are fixedly connected and interconnected. The drive shaft (4) passes through the first axle housing (1) and the second axle housing (2). A brake piston (3) is provided inside the second axle housing (2). A first brake pad (5) and a second brake pad (6) are provided between the brake piston (3) and the first axle housing (1). The first brake pad (5) is connected to the drive shaft (4) and can slide along the axial direction of the drive shaft (4). A brake fluid chamber (7) is provided between the brake piston (3) and the second axle housing (2). The brake fluid chamber (7) is used to supply oil and push the brake piston (3) toward the first brake pad (5).

2. The wet braking structure for the drive axle according to claim 1, characterized in that: The brake piston (3) has a first step on the outer periphery of the middle part, and the second bridge housing (2) has a second step on the inner wall. The end of the first step away from the first brake pad (5) and the second step form an annular brake fluid cavity (7).

3. The wet braking structure for the drive axle according to claim 2, characterized in that: The first step is fitted with a first sealing ring (8) on its outer periphery, and the brake piston (3) is fitted with a second sealing ring (9) on its outer periphery at the end away from the first brake pad (5). Both the first sealing ring (8) and the second sealing ring (9) are in sealing contact with the inner wall of the second axle housing (2).

4. The wet braking structure for the drive axle according to claim 3, characterized in that: The inner wall of the second bridge housing (2) is provided with an annular sealing groove, and the first sealing ring (8) and the second sealing ring (9) are respectively embedded in the corresponding sealing groove.

5. The wet braking structure for the drive axle according to claim 1, characterized in that: The second bridge housing (2) is also equipped with a reset component (10) that can drive the brake piston (3) to reset when the brake fluid chamber (7) returns oil.

6. The wet braking structure for the drive axle according to claim 5, characterized in that: The reset component (10) includes a mounting cylinder (11), a reset shaft (12) is slidably connected inside the mounting cylinder (11), one end of the reset shaft (12) is fixedly connected to the end of the brake piston (3) away from the first sealing ring (8), and the other end of the reset shaft (12) is fixedly fixed with a limiting member (13). A compression spring (14) is provided between the limiting member (13) and the end of the mounting cylinder (11), and the compression spring (14) is sleeved on the reset shaft (12); the mounting cylinder (11) is fixedly connected to the second bridge housing (2).

7. The wet braking structure for the drive axle according to claim 6, characterized in that: One end of the reset shaft (12) is connected to the end of the brake piston (3) away from the first sealing ring (8) by a thread.

8. The wet braking structure for the drive axle according to claim 6, characterized in that: The limiting member (13) is a locking nut and is threadedly connected to the reset shaft (12). The end of the mounting cylinder (11) is also fixed with a washer (15). The washer (15) is in contact with the reset shaft (12). One end of the compression spring (14) abuts against the limiting member (13) and the other end abuts against the washer (15).

9. The wet braking structure for the drive axle according to claim 1, characterized in that: Both the first brake pad (5) and the second brake pad (6) are annular. The first brake pad (5) is connected to the drive shaft (4) by a spline. There is a gap between the second brake pad (6) and the drive shaft (4). The outer periphery of the second brake pad (6) is in rotational contact with the inside of the first axle housing (1).

10. A rear drive axle for harvesting machinery, characterized in that: It includes a central drive assembly (20), with bridge tube assemblies (21) installed at both ends of the central drive assembly (20), and a wet braking structure for the drive axle as described in any one of claims 1-9 is provided between the central drive assembly (20) and the bridge tube assembly (21).

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