Mechanical gearbox with hydraulic flexible clutch separation system

Abstract

The utility model relates to a mechanical gearbox, in particular to a mechanical gearbox with a hydraulic flexible clutch separation system. The mechanical gearbox comprises a hydraulic release bearing, a bearing seat, a gearbox body, a release pedal mechanism, a hydraulic oil pipe and a main cylinder. The separation pedal mechanism and the main cylinder are installed on a vehicle body, a piston rod of the main cylinder is hinged to the separation pedal mechanism, a hydraulic port of the main cylinder is connected with one end of the hydraulic oil pipe, and the other end of the hydraulic oil pipe is connected with a hydraulic port of the hydraulic separation bearing. The hydraulic release bearing is installed on the gearbox body and arranged on an input shaft of the gearbox body in a sleeving mode. Inner cavities of the main cylinder, the hydraulic oil pipe and the hydraulic release bearing form a sealed cavity, and hydraulic oil is stored in the sealed cavity. The hydraulic release bearing is controlled only by hydraulic pressure, so that the clutch is combined and separated, the structure is simple, the manufacturing cost is low, the required installation space is small, the installation requirements of various commercial vehicles can be met, and the application range is wide.

Description

Technical Field

[0001] This utility model relates to a mechanical gearbox, specifically a mechanical gearbox with a hydraulic flexible clutch disengagement system. Background Technology

[0002] See Figure 1 and Figure 2 Currently, the clutch separation structure of traditional commercial vehicle MT transmissions typically uses a mechanical release fork to drive a mechanical release bearing to achieve clutch separation and engagement. This includes a mechanical release bearing 01, a bearing cover 02, a release fork 03, a transmission body 04, a power steering pump 06, hydraulic lines 07, a master cylinder 08, and a release pedal mechanism 09. The mechanical release bearing 01 is mounted on the transmission body 04 via the bearing cover 02. The release fork 03 is mounted on the mechanical release bearing 01, and its working end can be deflected at a certain angle to abut against the release finger of the clutch 05. The release fork 03 is connected to the master cylinder 08 via the power steering pump 06 and hydraulic lines 07. The piston rod of the master cylinder 08 is hinged to the release pedal mechanism 09.

[0003] In actual use, due to the inherent fluctuations in engine speed, coupled with unavoidable factors such as coaxiality errors between the engine flywheel, clutch, and gearbox, as well as manufacturing and deformation errors of parts (uneven clutch release fingers, uneven shift fork feet), problems such as clutch vibration, abnormal clutch noise, increased free travel of the release pedal, and pedal vibration and numbness occur, resulting in a poor driving experience in clutch operation. To fundamentally solve the above problems, it is necessary to optimize every component of the release system, such as reducing engine speed fluctuations, improving the dimensional tolerance level of parts, and improving the assembly process. However, any improvement in any of these methods will result in a significant increase in cost.

[0004] Chinese patent CN205639387U discloses a clutch control system for commercial vehicles, including an oil tank, oil pipe I, a clutch master cylinder, a clutch pedal assembly, oil pipe II, an air reservoir, an air pipe, an air-assisted hydraulic device, oil pipe III, a clutch housing, oil pipe IV, and a release bearing. The clutch pedal assembly is mounted and fixed on the vehicle body bracket, and the clutch master cylinder is fixed on the clutch pedal assembly. The oil tank is connected to the clutch master cylinder through oil pipe I, and its rear end is connected to the hydraulic release bearing through oil pipes III and IV. Although this system uses a hydraulic release bearing to achieve clutch engagement or disengagement, it requires pneumatic assistance in conjunction with hydraulic control to achieve the control of the hydraulic release bearing, resulting in a relatively complex structure, a large installation space requirement, and high manufacturing costs.

[0005] Therefore, how to economically and effectively solve the above-mentioned problems of clutches is one of the problems that needs to be solved in automotive design and application. Utility Model Content

[0006] The purpose of this invention is to solve the technical problems of existing mechanical clutch control systems, such as complex structure, large installation space required, and high manufacturing cost, and to provide a mechanical gearbox with a hydraulic flexible clutch disengagement system.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A mechanical gearbox with a hydraulically flexible clutch disengagement system, characterized by the following features:

[0009] Includes hydraulic release bearing, bearing housing, gearbox body, release pedal mechanism, hydraulic oil pipes, and master cylinder;

[0010] The release pedal mechanism and the master cylinder are respectively mounted on the vehicle body. The piston rod of the master cylinder is hinged to the release pedal mechanism. The hydraulic port of the master cylinder is connected to one end of the hydraulic oil pipe, and the other end of the hydraulic oil pipe is connected to the hydraulic port of the hydraulic release bearing.

[0011] The hydraulic release bearing is mounted on the gearbox body and fitted onto the input shaft of the gearbox body;

[0012] The master cylinder, hydraulic oil pipe, and hydraulic release bearing form a sealed cavity containing hydraulic oil. The volume of the hydraulic oil is smaller than the volume of the sealed cavity, and the following conditions are met: when the piston rod is in its initial state, the working end of the hydraulic release bearing is in loose contact with the clutch release finger; when the piston rod is in its maximum stroke, the working end of the hydraulic release bearing presses against the clutch release finger to achieve clutch disengagement.

[0013] Furthermore, the hydraulic release bearing is mounted on the gearbox body via a bearing housing, which is fitted onto the input shaft of the gearbox body.

[0014] Furthermore, the fixed end of the hydraulic release bearing is connected to one end of the bearing housing by a first bolt, and the other end of the bearing housing is connected to the gearbox body by a second bolt.

[0015] Furthermore, there are multiple first and second bolts, arranged along the circumferential direction.

[0016] Furthermore, a displacement sensor is provided on the separation pedal mechanism.

[0017] Furthermore, the hydraulic hose is a flexible hose.

[0018] The beneficial effects of this utility model are:

[0019] 1. This utility model uses only hydraulically controlled hydraulic release bearings to achieve clutch engagement and disengagement. It has a simple structure, low manufacturing cost, requires less installation space, can meet the installation needs of various types of commercial vehicles, and has a wide range of applications.

[0020] 2. This utility model adapts the traditional mechanical gearbox bearing housing and clutch housing to a hydraulic clutch release bearing unit, replacing the traditional mechanical release bearing and clutch disengagement operation. It achieves clutch disengagement and engagement through flexible hydraulic power transmission, effectively avoiding the disengagement mechanism vibration, clutch noise, increased free travel of the release pedal, and pedal vibration and numbness caused by the inherent factors of mechanical connection in the traditional disengagement mechanism. It greatly improves the comfort of clutch operation in traditional commercial vehicles and the driver's driving experience, and has good economic benefits and application prospects. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of an existing mechanical gearbox;

[0022] Figure 2 This is a schematic diagram of the clutch disengagement system in an existing mechanical transmission;

[0023] Figure 3 This is a structural schematic diagram of an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the hydraulic flexible clutch separation system in an embodiment of this utility model.

[0025] In the diagram: 01-Mechanical release bearing, 02-Bearing cap, 03-Release fork, 04-Gearbox body, 05-Clutch, 06-Power steering pump, 07-Hydraulic lines, 08-Master cylinder, 09-Release pedal mechanism;

[0026] 1-Hydraulic release bearing, 2-Bearing housing, 3-Gearbox body, 4-Hydraulic oil pipe, 5-Master cylinder, 6-Release pedal mechanism. Detailed Implementation

[0027] To make the objectives, advantages, and features of this utility model clearer, the mechanical gearbox with a hydraulic flexible clutch disengagement system proposed by this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer according to the following specific embodiments.

[0028] See Figure 3 and Figure 4 This embodiment describes a mechanical gearbox with a hydraulic flexible clutch separation system, which mainly includes a hydraulic release bearing 1, a bearing housing 2, a gearbox body 3, a release pedal mechanism 6, a hydraulic oil pipe 4, and a master cylinder 5.

[0029] The release pedal mechanism 6 and the master cylinder 5 are respectively mounted on the vehicle body. A displacement sensor is installed on the release pedal mechanism 6 to monitor its movement stroke. A piston rod is mounted on the master cylinder 5, which can move axially along the cylinder. The piston rod is hinged to the release pedal mechanism 6, thereby driving the piston rod to move axially via the release pedal mechanism 6. One end of the hydraulic port of the master cylinder 5 is connected to a hydraulic oil pipe 4, and the other end of the hydraulic oil pipe 4 is connected to the hydraulic port of the hydraulic release bearing 1. Preferably, the hydraulic oil pipe 4 is a flexible hose made of rubber or similar materials, which can be bent appropriately according to installation needs for ease of installation.

[0030] The hydraulic release bearing 1 is mounted on the gearbox body 3 via a bearing housing 2. Specifically, the fixed end of the hydraulic release bearing 1 is coaxially connected to one end of the bearing housing 2 via a first bolt, and the other end of the bearing housing 2 is connected to the gearbox body 3 via a second bolt. Multiple first and second bolts are used, arranged circumferentially. The bearing housing 2 is mounted on the input shaft of the gearbox body 3, and the hydraulic release bearing 1 is also mounted on the input shaft of the gearbox body 3. Both the bearing housing 2 and the hydraulic release bearing 1 are rotatably engaged with the input shaft of the gearbox body 3.

[0031] The aforementioned master cylinder 5, hydraulic oil pipe 4, and hydraulic release bearing 1 form a sealed cavity containing hydraulic oil. To drive the working end of the hydraulic release bearing 1, the volume of the hydraulic oil needs to be smaller than the volume of the sealed cavity, and the following conditions must be met: when the piston rod is in the initial state, the working end of the hydraulic release bearing 1 is in loose contact with the clutch 05 release finger; when the piston rod is in its maximum stroke, the working end of the hydraulic release bearing 1 is pressed against the clutch 05 release finger to achieve clutch 05 disengagement.

[0032] The working process of the mechanical gearbox in this embodiment is as follows:

[0033] The driver presses the release pedal mechanism 6, which pushes the hydraulic oil in the master cylinder 5 through the hydraulic oil pipe 4 into the inner cavity of the hydraulic release bearing 1. Under the push of the hydraulic oil, the working end of the hydraulic release bearing 1 extends, squeezing the clutch 05 release finger, thus disengaging the clutch 05 and cutting off the power transmission of the whole vehicle. Conversely, when the driver releases the release pedal mechanism 6, the active pressure is released, the hydraulic oil returns to the master cylinder 5, the clutch 05 release finger returns to its extension under the action of the spring, the working end of the hydraulic release bearing 1 shortens inward, making a loose contact with the clutch 05 release finger, and the clutch 05 completes engagement, realizing the power transmission of the whole vehicle.

Claims

1. A mechanical gearbox with a hydraulically flexible clutch disengagement system, characterized in that: It includes a hydraulic release bearing (1), a bearing housing (2), a gearbox body (3), a release pedal mechanism (6), hydraulic oil pipes (4), and a master cylinder (5); The release pedal mechanism (6) and the master cylinder (5) are respectively installed on the vehicle body. The piston rod of the master cylinder (5) is hinged to the release pedal mechanism (6). The hydraulic port of the master cylinder (5) is connected to one end of the hydraulic oil pipe (4). The other end of the hydraulic oil pipe (4) is connected to the hydraulic port of the hydraulic release bearing (1). The hydraulic release bearing (1) is mounted on the gearbox body (3) and fitted onto the input shaft of the gearbox body (3); The inner cavities of the master cylinder (5), hydraulic oil pipe (4), and hydraulic release bearing (1) form a sealed cavity containing hydraulic oil. The volume of the hydraulic oil is smaller than the volume of the sealed cavity, and the following conditions are met: when the piston rod is in the initial state, the working end of the hydraulic release bearing (1) is in light contact with the clutch (05) release finger; when the piston rod is in the maximum stroke, the working end of the hydraulic release bearing (1) is pressed against the clutch (05) release finger to achieve clutch (05) separation.

2. A mechanical gearbox with a hydraulic flexible clutch disengagement system according to claim 1, characterized in that: The hydraulic release bearing (1) is mounted on the gearbox body (3) via a bearing housing (2), which is fitted onto the input shaft of the gearbox body (3).

3. A mechanical gearbox with a hydraulic flexible clutch disengagement system according to claim 2, characterized in that: The fixed end of the hydraulic release bearing (1) is connected to one end of the bearing housing (2) by a first bolt, and the other end of the bearing housing (2) is connected to the gearbox body (3) by a second bolt.

4. A mechanical gearbox with a hydraulically flexible clutch disengagement system according to claim 3, characterized in that: There are multiple first and second bolts, arranged along the circumferential direction.

5. A mechanical gearbox with a hydraulically flexible clutch disengagement system according to claims 1-4, characterized in that: A displacement sensor is provided on the separation pedal mechanism (6).

6. A mechanical gearbox with a hydraulically flexible clutch disengagement system according to claim 5, characterized in that: The hydraulic oil pipe (4) is a flexible hose.

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