Master cylinder split type full decoupling brake-by-wire assembly

Abstract

The utility model relates to the technical field of automobile line control brake, disclose a main cylinder separation formula's full decoupling line control brake assembly, including valve body module, simulator module, main cylinder module, main cylinder module is separate in valve body module, simulator module is integrated in valve body module, main cylinder module and valve body module are connected through the oil pipe between, the oil outlet of main cylinder one cavity is connected through the oil pipe with valve body one cavity oil inlet, the oil outlet of main cylinder's two cavities is connected through the oil pipe with valve body two cavity oil inlet, the split design does not need to consider assembly space and position size excessively, provides high flexibility for main machine factory when the body arrangement, and reduced product's failure risk, improve product safety reliability.

Description

Technical Field

[0001] This utility model relates to the field of automotive brake-by-wire technology, and in particular to a fully decoupled brake-by-wire assembly with a separate master cylinder. Background Technology

[0002] Currently, the brake-by-wire systems used in passenger cars and commercial vehicles generally consist of three main modules: valve body, simulator, and master cylinder. The master cylinder and simulator are usually integrated into the valve body. The outstanding advantage of this approach is the high degree of product integration; however, it also has compatibility issues. If the engine compartment space is small, the product is difficult to install or cannot be installed at all.

[0003] To address the aforementioned issues, improved split-type designs have emerged in the market. These designs integrate the simulator and master cylinder into a single module, while the valve body remains a separate module. The advantage of this split-type design is that it effectively reduces the size of the valve body. However, this design requires an isolation valve in the simulator module to decouple the master cylinder and power cylinder. Since the controller is located on the valve body, a wire needs to be routed from the controller to control the isolation valve. If the valve body is located in the middle of the vehicle body, and the master cylinder is located in the driver's compartment, the wire length will be relatively long, leading to both pressure drop and the risk of breakage. Summary of the Invention

[0004] This invention provides a fully decoupled linear control brake assembly with a separate master cylinder. The master cylinder is separated into one module, while the simulator and valve body are integrated into another module, which can effectively solve the problems of existing split-type solutions.

[0005] The technical solution adopted in this utility model is: A fully decoupled linear control brake assembly with a separate master cylinder includes a valve body module, a simulator module, and a master cylinder module. The master cylinder module is independent of the valve body module, while the simulator module is integrated into the valve body module. The master cylinder module and the valve body module are connected by an oil pipe. The master cylinder module includes a master cylinder first chamber and a master cylinder second chamber, and the valve body module includes a valve body first chamber and a valve body second chamber. The oil outlet of the master cylinder first chamber is connected to the oil inlet of the valve body first chamber by an oil pipe, and the oil outlet of the master cylinder second chamber is connected to the oil inlet of the valve body second chamber by an oil pipe.

[0006] Furthermore, the valve body module is provided with an assembly hole, into which the piston assembly, the rebound assembly, the simulator housing, and the threaded sleeve are sequentially installed; the rebound assembly contacts the piston assembly through a push rod; the rebound assembly is fitted into the simulator housing and fixed to the valve body module by the threaded sleeve.

[0007] Furthermore, the internal pipe from the oil inlet of the valve body chamber to the piston assembly has fewer than 5 bends and a total length of less than 200mm.

[0008] Compared with the prior art, the beneficial effects of this utility model are: (1) The separate design of the master cylinder and valve body can greatly facilitate the layout of the OEM; since only the master cylinder needs to be installed in the cab, it is particularly advantageous for engine compartments with relatively compact installation space (such as cab-over trucks); while the valve body can be installed in any convenient location in the engine compartment or body. (2) No need to control the isolation valve from the valve body controller; (3) It can solve the problem that the main cylinder and simulator of existing market products are large in size and difficult or impossible to install in the cockpit. Attached Figure Description

[0009] Figure 1 Schematic diagram of the master cylinder split-type fully decoupled linear control brake assembly provided by this utility model; Figure 2 This is a schematic diagram showing the integration of the simulator module and the valve body module of this utility model; Figure 3 This is a pipeline oil circuit diagram for the simulator module of this utility model; Figure 4 This is a schematic diagram showing the connection between the main cylinder module and the valve body module of this utility model; The components are: 1. Master cylinder module, 2. Simulator module, 3. Valve body module, 4. Valve body chamber 1 oil inlet, 5. SSV valve, 6. Valve body chamber 2 oil inlet, 7. Master cylinder chamber 1 oil outlet, 8. Master cylinder chamber 2 oil outlet, 9. Assembly hole, 10. Piston assembly, 11. Rebounder assembly, 12. Threaded sleeve, 13. Simulator housing. Detailed Implementation

[0010] The present invention will be further described below with reference to the accompanying drawings.

[0011] like Figure 1 and 4 As shown, the fully decoupled drive-by-wire braking assembly with a separate master cylinder provided by this utility model has a separate master cylinder module and a valve body module, which are connected by an oil pipe. The length of the oil pipe depends on the arrangement of the master cylinder module and the valve body module in the vehicle. The oil outlet of the first chamber of the master cylinder is connected to the oil inlet of the first chamber of the valve body by an oil pipe, and the oil outlet of the second chamber of the master cylinder is connected to the oil inlet of the second chamber of the valve body by an oil pipe. The master cylinder module is a separate module, and the valve body module integrates a simulator module. Its functions are the same as those of the existing fully decoupled drive-by-wire braking system, including service braking, ABS, ESC, TCS and other functions.

[0012] like Figure 2As shown, the valve body module has assembly holes machined on it. The piston assembly, the rebound assembly, the simulator housing, and the threaded sleeve are sequentially installed in the assembly holes. The rebound assembly contacts the piston through the push rod. The rebound assembly is then fitted into the simulator housing and fixed to the valve body module by the threaded sleeve.

[0013] like Figure 3 As shown, the internal piping from the valve body's inlet to the simulator piston assembly typically has bends due to manufacturing processes. Shorter bends and fewer turns result in less damping caused by the increased viscosity of the brake fluid in cold conditions. Based on multiple tests, a total internal piping length of less than 200mm and fewer than 5 bends are optimal. When implemented according to these specifications, the product can effectively improve the pedal feel in low-temperature environments (generally -40°C) and also solve the simulator's oil return problem.

[0014] Its working principle is as follows: when the driver presses the brake pedal, the pressure oil in the master cylinder chamber passes through the oil inlet of the valve body chamber, through the SSV valve, and enters the simulator piston chamber. The pressure oil pushes the piston to move, which in turn pushes the rebounder to move downward. Because the rebounder is composed of a set of disc springs, the force corresponding to different strokes is different, thereby simulating the driver's foot feel.

[0015] The fully decoupled braking assembly with a separate master cylinder provided by this utility model is arranged separately during installation and adaptation, without needing to consider the size of the vehicle body space and installation position. Moreover, it does not have too many external pipelines and lead wires for control, which greatly reduces the risk of product failure and improves product reliability.

Claims

1. A fully decoupled linear brake assembly with a separate master cylinder, comprising a valve body module, a simulator module, and a master cylinder module, characterized in that: The main cylinder module is separate from the valve body module, and the simulator module is integrated into the valve body module; the main cylinder module and the valve body module are connected by oil pipes; the main cylinder module includes a main cylinder first chamber and a main cylinder second chamber, and the valve body module includes a valve body first chamber and a valve body second chamber. The oil outlet of the main cylinder first chamber is connected to the oil inlet of the valve body first chamber by oil pipes, and the oil outlet of the main cylinder second chamber is connected to the oil inlet of the valve body second chamber by oil pipes.

2. The fully decoupled linear braking assembly with a separate master cylinder as described in claim 1, characterized in that: The valve body module is provided with an assembly hole, into which the piston assembly, the rebound assembly, the simulator housing and the threaded sleeve are sequentially installed; the rebound assembly contacts the piston assembly through a push rod; the rebound assembly is fitted into the simulator housing and fixed to the valve body module by the threaded sleeve.

3. The fully decoupled linear braking assembly with a separate master cylinder as described in claim 2, characterized in that: The internal pipe from the oil inlet of the valve body chamber to the piston assembly has fewer than 5 bends and a total length of less than 200mm.

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