Zero band wet brake

Abstract

The utility model relates to a zero belt exhaust type brake, including brake shell, clutch shell, rear shell, the drive gear hub is connected in brake shell, the transmission shaft is connected in clutch shell, the transmission shaft slides and is equipped with passive gear hub, the transmission shaft slides and is equipped with friction plate assembly, the first elastic unit and piston are slid in brake shell, the first oil inlet leads to the piston cavity of piston, the left end of rear shell is embedded with the travel brake piston, the piston cavity of travel brake piston is connected with second oil inlet, the parking piston is slid in the rear shell and is connected with the second elastic unit, the transmission shaft and parking piston inner shaft are equipped with push and pull shaft, the left end bearing of push and pull shaft connects passive gear hub, hydraulic oil can enter from third oil inlet, push and pull shaft retreat after parking piston, the utility model can make the transmission shaft and friction plate assembly between external no mechanical connection through parking piston and transmission shaft uncoupling, active gear hub and passive gear hub uncoupling, realize zero belt exhaust torque.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicles, and in particular to a zero-load moisture-venting brake. Background Technology

[0002] Wet brakes are widely used in engineering machinery, mining equipment, agricultural machinery, and special vehicles. Their core feature is immersing the brake pads in hydraulic fluid, which cools and lubricates the brake pads, significantly reducing heat generation and wear during braking. Compared to traditional dry brakes, wet brakes offer advantages such as better heat dissipation, longer service life, and adaptability to harsh environments. However, wet brakes inherently exhibit a pull-out torque; even when the brake pads are not engaged, a significant pull-out torque still exists. This torque causes the brake to overheat and increases power loss, which is detrimental to new energy vehicles. Utility Model Content

[0003] The purpose of this invention is to solve the problem of large discharge torque in wet brakes and to provide a wet brake with zero discharge torque.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A zero-load dehumidification type brake includes a brake housing, a clutch housing, and a rear housing fixedly connected from left to right. The brake housing is provided with a first oil inlet, and the rear housing is provided with a second oil inlet and a third oil inlet from left to right.

[0006] The brake housing is equipped with an active gear hub via a bearing.

[0007] A drive shaft is mounted inside the clutch housing via bearings. A driven gear hub is slidably mounted on the left end of the drive shaft along its axial direction. A friction plate assembly is slidably mounted on the drive shaft along its axial direction. A first elastic unit and a piston are slidably mounted inside the brake housing. The first elastic unit is located on the right side of the driven gear hub and is connected to the driven gear hub via a bearing. It is used to apply a thrust to the driven gear hub to make the driven gear hub mesh with the driving gear hub. A piston chamber for mounting the piston is formed between the brake housing and the clutch housing. The piston chamber of the piston is connected to the first oil inlet. The right end of the first elastic unit abuts against the piston.

[0008] The left end of the rear housing is fitted with a service brake piston. The service brake piston is fixedly connected to a push plate. The push plate is disposed between the friction plate assembly and the service brake piston. The side of the service brake piston away from the push plate is provided with a piston chamber. The piston chamber of the service brake piston is connected to the second oil inlet.

[0009] A parking piston is axially slidably connected inside the rear housing. A second elastic unit is connected to the right side of the parking piston. The two ends of the second elastic unit abut against the parking piston and the rear housing, respectively, to apply a thrust to the parking piston to connect it to the drive shaft. A push-pull shaft is axially inserted inside the drive shaft and the parking piston. The left end of the push-pull shaft is connected to the driven gear hub through a bearing. A piston chamber for the parking piston is formed between the parking piston and the push-pull shaft. The parking piston has a radial through hole. Hydraulic oil enters between the rear housing and the push-pull shaft, and between the push-pull shaft and the parking piston, through the third oil inlet and the radial through hole, thereby pushing the parking piston and the push-pull shaft backward.

[0010] In some embodiments, the first elastic unit includes a parking pressure plate and a first spring. The parking pressure plate is slidably disposed in the brake housing via a spline. The parking pressure plate is connected to the driven gear hub via a first thrust bearing. The clutch housing has an extension extending into the brake housing. The extension and the brake housing form a piston chamber for the piston. One end of the piston can abut against the extension. The first spring is installed in the parking pressure plate, and both ends of the first spring abut against the parking pressure plate and the piston, respectively.

[0011] In some embodiments, when the parking piston is connected to the drive shaft by the thrust of the second elastic unit, the parking piston is axially slidably connected to the drive shaft by an internal spline.

[0012] In some embodiments, the rear housing includes a rear housing end cap and a stop ring, the end cap and the stop ring being mounted on the rear housing via a retaining ring through a hole.

[0013] In some embodiments, the device further includes a pull rod and a forced unlocking nut, one end of which is connected to the forced unlocking nut by a thread, and the other end is engaged in the oblong hole of the push-pull shaft by a pin, the pin being partially engaged in the groove of the end cap.

[0014] In some embodiments, the push-pull shaft is engaged in the groove of the end cover by the pin, the pin is engaged in the waist-shaped hole of the push-pull shaft, the inner ring of the stop ring is engaged in the notch groove of the end cover, and the outer ring is engaged in the groove of the rear shell.

[0015] In some embodiments, the second elastic element is a second spring, which is installed between the parking piston and the end cap.

[0016] In some embodiments, the parking piston includes a first piston portion and a second piston portion, a first end of the first piston portion is disposed toward the drive shaft, a second end of the first piston portion is fixedly connected to the first end of the second piston portion, a second elastic unit abuts against the second end of the second piston portion, a radial through hole is disposed between the first piston portion and the second piston portion, and the diameter of the first end of the second piston portion is larger than the diameter of the second end of the first piston portion.

[0017] In some embodiments, the driven gear hub is slidably mounted on the left end of the drive shaft via a spline along its axial direction, and the friction plate assembly is slidably mounted on the right end of the drive shaft via a spline along its axial direction.

[0018] In some embodiments, the parking piston is slidably mounted on the rear housing via an external spline.

[0019] This utility model has the following beneficial effects:

[0020] This application, by setting a first oil inlet in the brake housing and a second and third oil inlet in the rear housing, enables the engagement of the driven and driven gear hubs, the engagement of the push plate and the friction pad assembly, and the engagement of the parking piston and the drive shaft to be controlled by hydraulic oil. This allows the wet brake to be in different working states. When there is no braking force, the parking piston disengages from the drive shaft, and the push-pull shaft retracts to pull the driven gear hub, causing the driven and driven gear hubs to disengage. At this time, since the driven and driven gear hubs are disengaged, there is no mechanical connection between the external drive shaft and the friction pad assembly, achieving zero discharge torque, avoiding the brake from overheating due to discharge torque, and reducing power loss. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the wet brake structure in the parking state in an embodiment of this utility model;

[0022] Figure 2 This is a schematic diagram of the wet brake structure in the zero-belt-outlet state without braking force in an embodiment of this utility model;

[0023] Figure 3 This is a schematic diagram of the wet brake structure in the driving braking state in this utility model embodiment;

[0024] Figure 4 This is a schematic diagram of the wet brake structure in the forced unlocking state in an embodiment of this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1-Driver housing, 2-Clutch housing, 3-Rear housing, 4-Drive gear hub, 5-First bearing, 6-Driven gear hub, 7-First thrust bearing, 8-Parking pressure plate, 9-First spring, 10-Piston, 11-Drive shaft, 12-Push-pull shaft, 13-Second thrust bearing, 14-Second bearing, 15-Friction plate assembly, 16-Service brake piston, 17-Parking piston, 18-End cover, 19-Second spring, 20-Tie rod, 21-Pin, 22-Forced unlocking nut, 25-Stop ring, 26-Hole retaining ring, 31-Push plate. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of this utility model.

[0028] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for fixing, coupling, or communication.

[0029] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] refer to Figure 1 A zero-load dehumidification type brake includes a brake housing 1, a clutch housing 2, and a rear housing, which are fixedly connected from left to right. The brake housing 1 is provided with a first oil inlet, and the rear housing is provided with a second oil inlet and a third oil inlet from left to right.

[0032] A drive gear hub 4 is mounted inside the brake housing 1 via a bearing.

[0033] A drive shaft 11 is mounted inside the clutch housing 2 via a bearing. A driven gear hub 6 is slidably mounted on the left end of the drive shaft 11 along its axial direction. A friction plate assembly 15 is slidably mounted on the drive shaft 11 along its axial direction. A first elastic unit and a piston 10 are slidably mounted inside the brake housing 1. The first elastic unit is located on the right side of the driven gear hub 6 and is connected to the driven gear hub 6 via a bearing. It is used to apply a thrust to the driven gear hub 6 so that the driven gear hub 6 meshes with the driving gear hub 4. A piston chamber for mounting the piston 10 is formed between the brake housing 1 and the clutch housing 2. The piston chamber of the piston 10 is connected to the first oil inlet. The right end of the first elastic unit abuts against the piston 10.

[0034] The left end of the rear housing is fitted with a service brake piston 16. The service brake piston 16 is fixedly connected to a push plate 31. The push plate 31 is located between the friction plate assembly 15 and the service brake piston 16. The side of the service brake piston 16 away from the push plate 31 is provided with a piston chamber. The piston chamber of the service brake piston 16 is connected to the second oil inlet.

[0035] A parking piston 17 is axially slidably connected inside the rear housing. A second elastic unit is connected to the right side of the parking piston 17. The two ends of the second elastic unit abut against the parking piston 17 and the rear housing, respectively, to apply a thrust to the parking piston 17 so that the parking piston 17 is connected to the drive shaft 11. A push-pull shaft 12 is axially inserted inside the drive shaft 11 and the parking piston 17. The left end of the push-pull shaft 12 is connected to the driven gear hub 6 through a bearing. A piston chamber of the parking piston 17 is formed between the parking piston 17 and the push-pull shaft 12. The parking piston 17 has a radial through hole. Hydraulic oil enters between the rear housing and the push-pull shaft 12 and between the push-pull shaft 12 and the parking piston 17 through the third oil inlet and the radial through hole, thereby pushing the parking piston 17 and the push-pull shaft 12 backward.

[0036] In this embodiment, there are 4 pistons in total, consisting of 3 sets: 1. Piston 10, 2. Service brake piston 16, 3. Parking piston 17 and push-pull shaft 12, wherein the push-pull shaft 12 is embedded in the parking piston 17; in this embodiment, three hydraulic oil lines are controlled through the first to third oil inlets to control the above three sets of pistons respectively.

[0037] In this embodiment and some other embodiments, the first elastic unit includes a parking pressure plate 8 and a first spring 9. The parking pressure plate 8 is slidably disposed within the brake housing 1 via a spline. The parking pressure plate 8 is connected to the driven gear hub 6 via a first thrust bearing 7. The clutch housing 2 has an extension extending into the brake housing 1, which forms a piston chamber for the piston 10 with the brake housing 1. One end of the piston 10 can abut against the extension. The first spring 9 is installed within the parking pressure plate 8, and its two ends abut against the parking pressure plate 8 and the piston 10, respectively. In this embodiment, the second thrust bearing 13 is installed between the push-pull shaft 12 and the driven gear hub 6.

[0038] In this embodiment and some other embodiments, when the parking piston 17 is connected to the drive shaft 11 by the thrust of the second elastic unit, the parking piston 17 is axially slidably connected to the drive shaft 11 through the internal spline.

[0039] In this embodiment and some other embodiments, the rear housing includes a rear housing 3, an end cap 18, and a stop ring 25. The end cap 18 and the stop ring 25 are mounted on the rear housing 3 through a hole using a retaining ring 26.

[0040] In this embodiment and some other embodiments, a pull rod 20 and a forced unlocking nut 22 are also included. One end of the pull rod 20 is connected to the forced unlocking nut 22 by a thread, and the other end is locked in the oblong hole of the push-pull shaft 12 by a pin 21. The pin 21 is partially locked in the groove of the end cover 18.

[0041] In some embodiments, the push-pull shaft 12 is engaged in the groove of the end cover 18 by the pin 21, and there is no relative rotational movement between the push-pull shaft 12 and the end cover 18. The pin 21 is engaged in the oblong hole of the push-pull shaft 12, so that the piston rod 30 can move linearly but cannot rotate. The inner ring of the stop ring 25 is engaged in the notch groove of the end cover 18, and the outer ring is engaged in the groove of the rear shell, so that there is no relative rotational movement between the end cover 18 and the rear shell.

[0042] In this embodiment and some other embodiments, the second elastic unit is a second spring 19, which is installed between the parking piston 17 and the end cap 18.

[0043] In this embodiment and some other embodiments, the parking piston 17 includes a first piston portion and a second piston portion. The first end of the first piston portion is disposed facing the drive shaft 11. The second end of the first piston portion is fixedly connected to the first end of the second piston portion. The second elastic unit abuts against the second end of the second piston portion. A radial through hole is disposed between the first piston portion and the second piston portion. The diameter of the first end of the second piston portion is larger than the diameter of the second end of the first piston portion.

[0044] In this embodiment and some other embodiments, the left end of the drive shaft 11 is provided with a passive gear hub 6 via a spline along its axial direction, the right end of the drive shaft 11 is provided with a friction plate assembly 15 via a spline along its axial direction, and the parking piston 17 is slidably mounted on the rear housing via an external spline.

[0045] The zero-load wet brake of this utility model embodiment can form four working states based on the working state of the hydraulic oil: parking brake state, service brake state, zero-load wet brake state, and forced unlocking state. The following is a detailed description of this utility model embodiment with reference to the accompanying drawings:

[0046] refer to Figure 1In the parking state: no hydraulic oil applies pressure to the piston. When the brake piston has no external oil pressure, the driving hub 4 and the driven hub 6 are pressed together by the first spring 9. The first spring 9 applies pressure to the parking pressure plate 8, causing the driving hub 4 and the driven hub 6 to engage, and the end face teeth of the driving hub 4 and the driven hub 6 are in an engaged state; under the action of the second spring 19, the parking piston 17 engages the gear ring with the drive shaft 11 through the spline. At this time, the external drive shaft is fixed through the driving hub 4 → driven hub 6 → drive shaft 11 → gear ring → rear housing, realizing the parking state.

[0047] refer to Figure 2 In the zero-belt, no-braking-force state: pressure is applied to the third oil inlet of the brake. The parking piston 17 drives the gear ring to retract, disengaging it from the drive shaft 11. Hydraulic oil enters the cavity between the push-pull shaft 12 and the parking piston 17 through the hole on the parking piston 17, causing the push-pull shaft 12 to retract. The push-pull shaft 12 pulls the driven gear hub 6, disengaging the driving gear hub 4 from the driven gear hub 6. At this time, because the driving gear hub 4 and the driven gear hub 6 are disengaged, there is no mechanical connection between the external drive shaft and the friction plate assembly 15, achieving the zero-belt, no-braking-force state.

[0048] refer to Figure 3 In the service braking state: With no braking force applied to the zero-load belt, pressure is applied to the first and second oil inlets. Entering the service braking state with no braking force applied to the zero-load belt: Pressurized oil pushes piston 10, engaging the driving hub 4 and the driven hub 6; pressurized oil also pushes the service braking piston 16 inside the rear housing, engaging the friction pad assembly 15. At this time, the external drive shaft achieves service braking via driving hub 4 → driven hub 6 → drive shaft 11 → friction pad assembly 15.

[0049] refer to Figure 4 In the forced unlock state: When the vehicle cannot start, it is in the parking brake state and cannot be unlocked hydraulically. Tighten the forced unlock nut 22 to cause the pull rod 20 to drive the pin 21 → push-pull shaft 12 → driven gear hub 6 to retract, forcibly disengaging the driving gear hub 4 and the driven gear hub 6. At this time, there is no mechanical connection between the external drive shaft and the friction plate assembly 15, and the vehicle can be towed by a trailer.

[0050] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. A zero-load moisture-venting brake, characterized in that, It includes a brake housing (1), a clutch housing (2), and a rear housing, which are fixedly connected from left to right. The brake housing (1) is provided with a first oil inlet, and the rear housing is provided with a second oil inlet and a third oil inlet from left to right. The brake housing (1) is equipped with an active gear hub (4) via a bearing. A drive shaft (11) is mounted inside the clutch housing (2) via a bearing. A passive gear hub (6) is slidably mounted on the left end of the drive shaft (11) along its axial direction. A friction plate assembly (15) is slidably mounted on the drive shaft (11) along its axial direction. A first elastic unit and a piston (10) are slidably mounted inside the brake housing (1). The first elastic unit is located on the right side of the passive gear hub (6) and is connected to the passive gear hub (6) via a bearing. It is used to apply a thrust to the passive gear hub (6) so that the passive gear hub (6) meshes with the active gear hub (4). A piston chamber for mounting the piston (10) is formed between the brake housing (1) and the clutch housing (2). The piston chamber of the piston (10) is connected to the first oil inlet. The right end of the first elastic unit abuts against the piston (10). The left end of the rear housing is fitted with a service brake piston (16), and the service brake piston (16) is fixedly connected to a push plate (31). The push plate (31) is disposed between the friction plate assembly (15) and the service brake piston (16). The service brake piston (16) has a piston chamber on the side away from the push plate (31), and the piston chamber of the service brake piston (16) is connected to the second oil inlet. A parking piston (17) is axially slidably connected inside the rear housing. A second elastic unit is connected to the right side of the parking piston (17). The two ends of the second elastic unit abut against the parking piston (17) and the rear housing respectively, and are used to apply a thrust to the parking piston (17) to connect the parking piston (17) to the drive shaft (11). A push-pull shaft (12) is axially inserted inside the drive shaft (11) and the parking piston (17). The left end of the push-pull shaft (12) is connected to the passive gear hub (6) through a bearing. A piston chamber of the parking piston (17) is formed between the parking piston (17) and the push-pull shaft (12). The parking piston (17) has a radial through hole. Hydraulic oil enters between the rear housing and the push-pull shaft (12) and between the push-pull shaft (12) and the parking piston (17) through the third oil inlet and the radial through hole, thereby pushing the parking piston (17) and the push-pull shaft (12) backward.

2. A zero-load dehumidification brake as described in claim 1, characterized in that, The first elastic unit includes a parking pressure plate (8) and a first spring (9). The parking pressure plate (8) is slidably disposed in the brake housing (1) via a spline. The parking pressure plate (8) is connected to the driven gear hub (6) via a first thrust bearing (7). The clutch housing (2) has an extension extending into the brake housing (1). The extension and the brake housing (1) form the piston chamber of the piston (10). One end of the piston (10) can abut against the extension. The first spring (9) is installed in the parking pressure plate (8). Both ends of the first spring (9) abut against the parking pressure plate (8) and the piston (10) respectively.

3. A zero-load moisture-venting brake as described in claim 1, characterized in that, When the parking piston (17) is connected to the drive shaft (11) by the thrust of the second elastic unit, the parking piston (17) is axially slidably connected to the drive shaft (11) through the internal spline.

4. A zero-load moisture-venting brake as described in claim 1, characterized in that, The rear housing includes a rear housing (3), an end cap (18), and a stop ring (25). The end cap (18) and the stop ring (25) are mounted on the rear housing (3) through a retaining ring (26).

5. A zero-load moisture-venting brake as described in claim 4, characterized in that, It also includes a pull rod (20) and a forced unlocking nut (22). One end of the pull rod (20) is connected to the forced unlocking nut (22) by a thread, and the other end is locked in the waist-shaped hole of the push-pull shaft (12) by a pin (21). The pin (21) is partially locked in the groove of the end cap (18).

6. A zero-load moisture-venting brake as described in claim 5, characterized in that, The push-pull shaft (12) is secured in the groove of the end cover (18) by the pin (21), the pin (21) is secured in the waist-shaped hole of the push-pull shaft (12), the inner ring of the stop ring (25) is secured in the notch groove of the end cover (18), and the outer ring is secured in the groove of the rear shell.

7. A zero-load moisture-venting brake as described in claim 4, characterized in that, The second elastic unit is a second spring (19), which is installed between the parking piston (17) and the end cap (18).

8. A zero-load moisture-venting brake as described in claim 1, characterized in that, The parking piston (17) includes a first piston part and a second piston part. The first end of the first piston part is disposed toward the drive shaft (11). The second end of the first piston part is fixedly connected to the first end of the second piston part. The second elastic unit abuts against the second end of the second piston part. The radial through hole is disposed between the first piston part and the second piston part. The diameter of the first end of the second piston part is larger than the diameter of the second end of the first piston part.

9. A zero-load moisture-venting brake as described in claim 1, characterized in that, The left end of the drive shaft (11) slides along its axial direction via a spline to the passive gear hub (6), and the right end of the drive shaft (11) slides along its axial direction via a spline to the friction plate assembly (15).

10. A zero-load moisture-venting brake as described in claim 1, characterized in that, The parking piston (17) is slidably mounted on the rear housing via an external spline.

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