Parking braking system

Abstract

The utility model relates to the technical field of vehicle engineering, and provides a parking braking system which comprises an air storage cylinder, the air inlet end of the air storage cylinder is communicated with an air pump and used for storing air compressed by the air pump, the air outlet end of the air storage cylinder is communicated with a three-position four-way electromagnetic valve, and the three-position four-way electromagnetic valve is communicated with a parking braking air chamber and a gearbox power cut-off air cylinder. The parking braking air chamber is connected with a gearbox parking brake, and the gearbox power cut-off air cylinder is connected with a speed change valve of the gearbox; the three-position four-way electromagnetic valve is connected with the parking braking switch, and the parking braking switch comprises a parking gear, a driving gear and an emergency braking gear and is used for controlling the three-position four-way electromagnetic valve to be in a corresponding parking state, a driving state and an emergency braking state. The problem that driving is carried out when parking braking is not completely relieved can be avoided, emergency braking of the vehicle is not affected, and the using safety of the vehicle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle engineering, in particular to a parking brake system. Background Art

[0002] The parking brake system of existing loaders is generally an air-cut brake, that is, when the handbrake is released, the gas in the air reservoir enters the parking brake chamber, the parking brake is released, and the parking brake indicator light goes out; when the handbrake is pulled up, the gas entering the parking brake chamber is cut off, and the gas in the parking brake chamber is discharged into the atmosphere at the same time, achieving the parking brake effect, and the parking brake indicator light comes on.

[0003] However, although the current parking brake system has a parking brake indicator light that stays on to remind the driver that the vehicle is in the parking state, some drivers still forget to release the parking brake and continue driving, causing the parking brake friction plate to sinter, affecting the safety of the vehicle.

[0004] Therefore, in view of the above problems, a parking brake system is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims to develop a parking brake system to solve the problem of driving without completely releasing the parking brake, and does not affect the emergency braking of the vehicle, thereby improving the safety of vehicle use.

[0006] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0007] A parking brake system includes an air reservoir, the air inlet end of the air reservoir is connected to an air pump for storing gas compressed by the air pump, the air outlet end of the air reservoir is connected to a three-position four-way solenoid valve, the three-position four-way solenoid valve is connected to a parking brake air chamber and a transmission power cut-off cylinder, the parking brake air chamber is connected to the transmission parking brake, and the transmission power cut-off cylinder is connected to the transmission's shift valve.

[0008] Preferably, the three-position four-way solenoid valve is connected to the parking brake switch, which includes three gears: parking gear, driving gear and emergency brake gear, and is used to control the three-position four-way solenoid valve to be in the corresponding parking state, driving state and emergency brake state.

[0009] Preferably, it also includes connecting pipes, which are configured as flexible hoses and include connecting pipe one, connecting pipe two and connecting pipe three. Connecting pipe one connects the air reservoir and the three-position four-way solenoid valve, connecting pipe two connects the parking brake air chamber and the three-position four-way solenoid valve, and connecting pipe three connects the transmission power cut-off cylinder and the three-position four-way solenoid valve.

[0010] Preferably, the three-position four-way solenoid valve includes four interfaces, wherein the first interface is connected to the air tank through connecting pipe 1, the second interface is directly connected to the atmosphere, the third interface is connected to the parking brake air chamber through connecting pipe 2, and the fourth interface is connected to the transmission power cut-off cylinder through connecting pipe 3.

[0011] Preferably, when the three-position four-way solenoid valve is in the parking state, the second interface is connected to the third interface and the fourth interface at the same time; when the three-position four-way solenoid valve is in the driving state, the first interface is connected to the third interface and the fourth interface at the same time; when the three-position four-way solenoid valve is in the emergency braking state, the first interface is connected to the fourth interface, and the second interface is connected to the third interface.

[0012] Preferably, the three-position four-way solenoid valve and the air reservoir are both arranged on the vehicle body, and the transmission power cut-off cylinder is arranged on the transmission's shift valve.

[0013] Preferably, it also includes a drain valve and a safety valve, both of which are connected to the air storage cylinder. The drain valve is connected to the bottom of the air storage cylinder, and the safety valve is connected to the top of the air storage cylinder.

[0014] The effects provided in the content of the utility model are only the effects of the embodiments, rather than all the effects of the utility model. The above technical solution has the following advantages:

[0015] The utility model provides a three-position four-way solenoid valve and a transmission power cut-off cylinder, so that the vehicle can cut off the power while parking, thereby preventing the problem of the vehicle driving in a state where the parking brake is not released, and fundamentally avoiding the sintering of the parking brake friction plate; and when emergency braking is required during vehicle driving, the vehicle can only perform the parking brake without cutting off the power, thereby preventing the vehicle from sliding in neutral and causing danger, and improving the safety of vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0017] Figure 1 A schematic diagram of the connection of the system of an embodiment of the present utility model;

[0018] Figure 2 A schematic diagram of the principle of the system of an embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the system installation of the embodiment of the utility model Figure 1 ;

[0020] Figure 4 This is a schematic diagram of the system installation of the embodiment of the utility model Figure 2 .

[0021] In the figure, 1. Air reservoir; 2. Three-position four-way solenoid valve; 3. Parking brake air chamber; 4. Transmission power cut-off cylinder; 5. Transmission parking brake; 6. Transmission; 7. Shift valve; 8. Connecting pipe 1; 9. Connecting pipe 2; 10. Connecting pipe 3; 11. Drain valve; 12. Safety valve. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figures 1-4 As shown, the utility model provides a technical solution:

[0024] A parking brake system includes an air reservoir 1, the air inlet end of the air reservoir 1 is connected to an air pump for storing gas compressed by the air pump, the air outlet end of the air reservoir 1 is connected to a three-position four-way solenoid valve 2, the three-position four-way solenoid valve 2 is connected to a parking brake air chamber 3 and a transmission power cut-off cylinder 4, the parking brake air chamber 3 is connected to a transmission parking brake 5 for braking and parking, preferably, its connection structure is consistent with the existing structural setting, the transmission power cut-off cylinder 4 is connected to a transmission 6 speed change valve 7 for cutting off the pressure oil entering the speed change valve 7 when the air is cut off, so that the speed change valve 7 is in a neutral state.

[0025] In this embodiment, the three-position four-way solenoid valve 2 is connected to the parking brake switch, which includes three gears: parking gear, driving gear and emergency brake gear, and is used to control the three-position four-way solenoid valve 2 to be in the corresponding parking state, driving state and emergency brake state. Preferably, the parking brake switch uses a three-speed switch commonly used on the market, which is simple to connect and economical.

[0026] In this embodiment, connecting pipes are also included. The connecting pipes are flexible hoses capable of transmitting high-pressure gas, including connecting pipe one 8, connecting pipe two 9 and connecting pipe three 10. Connecting pipe one 8 connects the air reservoir 1 and the three-position four-way solenoid valve 2, connecting pipe two 9 connects the parking brake air chamber 3 and the three-position four-way solenoid valve 2, and connecting pipe three 10 connects the transmission power cut-off cylinder 4 and the three-position four-way solenoid valve 2, and is used to transmit high-pressure gas to control the parking brake air chamber 3 and the transmission power cut-off cylinder 4 to operate.

[0027] In this embodiment, the three-position four-way solenoid valve 2 includes four interfaces, wherein the first interface is connected to the air reservoir 1 through the connecting pipe 1 8, the second interface is directly connected to the atmosphere, the third interface is connected to the parking brake air chamber 3 through the connecting pipe 2 9, and the fourth interface is connected to the transmission power cut-off cylinder 4 through the connecting pipe 3 10.

[0028] In this embodiment, when the three-position four-way solenoid valve 2 is in the parking state, the second interface is connected to the third interface and the fourth interface at the same time, and the first interface is closed to discharge the gas in the parking brake air chamber 3 and the transmission power cut-off cylinder 4; when the three-position four-way solenoid valve 2 is in the driving state, the first interface is connected to the third interface and the fourth interface at the same time to deliver the high-pressure gas in the air reservoir 1 to the parking brake air chamber 3 and the transmission power cut-off cylinder 4, so that the parking brake air chamber 3 and the transmission power cut-off cylinder 4 are actuated; when the three-position four-way solenoid valve 2 is in the emergency braking state, the first interface is connected to the fourth interface, and the second interface is connected to the third interface, so that the parking brake air chamber 3 is braked but the power is not cut off, which is safer.

[0029] In this embodiment, the three-position four-way solenoid valve 2 and the air reservoir 1 are both arranged on the vehicle body, and the transmission power cut-off cylinder 4 is arranged on the speed change valve 7 of the transmission 6, thereby improving the stability of the system.

[0030] In another embodiment, a drain valve 11 and a safety valve 12 are also included, both of which are connected to the air cylinder 1. Since there is water vapor in the compressed air, the water vapor will condense into liquid water in the air cylinder 1. The drain valve 11 is connected to the bottom of the air cylinder 1 to discharge the water in the air cylinder 1, thereby increasing the capacity of the compressed air and reducing the weight of the vehicle body; the safety valve 12 is connected to the top of the air cylinder 1 to release air to the external atmosphere to avoid possible danger caused by excessive pressure in the air cylinder 1, thereby further improving the safety of the system.

[0031] Working principle: the parking brake chamber 3 is an air-cut brake. When high-pressure gas is passed into the parking brake chamber 3, the parking brake is released. The transmission power cut-off cylinder 4 is an air-cut power cut-off. When high-pressure gas is passed into the transmission power cut-off cylinder 4, the power cut-off is released. The parking brake and the driving brake share the compressed air in the air reservoir 1; when the parking control switch is in the parking gear, the three-position four-way solenoid valve 2 is in the middle position, and the parking brake chamber 3 and the transmission power cut-off cylinder 4 are both connected to the atmosphere through the three-position four-way solenoid valve 2, so that the vehicle can achieve power cut-off while the parking brake is in effect, that is, the speed change valve 7 is always in the neutral state, which ensures that the vehicle cannot drive when in the parking state, and fundamentally avoids the problem of sintering of the parking brake friction plate; when the parking control switch is in the driving gear, the three-position four-way solenoid valve 2 is in the middle position, and the parking brake chamber 3 and the transmission power cut-off cylinder 4 are both connected to the atmosphere through the three-position four-way solenoid valve 2, so that the vehicle can achieve power cut-off while in the parking brake. That is, the speed change valve 7 is always in the neutral state, which ensures that the vehicle cannot drive when in the parking state, and fundamentally avoids the problem of sintering of the parking brake friction plate; when the parking control switch is in the driving gear, the three-position four-way solenoid valve When the magnetic valve 2 is in the right position, the compressed air in the air reservoir 1 enters from the first interface of the three-position four-way solenoid valve 2, and enters the parking brake air chamber 3 and the transmission power cut-off cylinder 4 through the third interface and the fourth interface respectively. At this time, the vehicle parking brake is released, the power cut-off is released, and the vehicle can drive normally; when the parking control switch is in the emergency brake gear, the solenoid valve is in the left position, the parking brake air chamber 3 is connected to the atmosphere through the second interface of the three-position four-way solenoid valve 2, and the compressed air in the air reservoir 1 enters the transmission power cut-off cylinder 4 from the first interface of the three-position four-way solenoid valve 2 through the fourth interface. At this time, the vehicle is in the parking brake state, but the power cut-off is released. This state prevents the vehicle from sliding in neutral when emergency braking is required during driving, thus avoiding danger and improving safety.

[0032] Anything not described in detail in the present invention is a conventional technical means known to those skilled in the art.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more such features. In the description of this utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A parking brake system, comprising an air reservoir (1), wherein the air inlet end of the air reservoir (1) is connected to an air pump and is used to store the gas compressed by the air pump, characterized in that: The air outlet end of the air reservoir (1) is connected to a three-position four-way solenoid valve (2), the three-position four-way solenoid valve (2) is connected to a parking brake air chamber (3) and a transmission power cut-off cylinder (4), the parking brake air chamber (3) is connected to a transmission parking brake (5), and the transmission power cut-off cylinder (4) is connected to a speed change valve (7) of a transmission (6).

2. The parking brake system according to claim 1, characterized in that: The three-position four-way solenoid valve (2) is connected to a parking brake switch, which includes three gear positions: parking gear, driving gear, and emergency brake gear, and is used to control the three-position four-way solenoid valve (2) to be in the corresponding parking state, driving state, and emergency brake state.

3. The parking brake system according to claim 2, characterized in that: The invention also includes connecting pipes, which are configured as flexible hoses and include connecting pipe 1 (8), connecting pipe 2 (9) and connecting pipe 3 (10). Connecting pipe 1 (8) is connected to the air storage cylinder (1) and the three-position four-way solenoid valve (2). Connecting pipe 2 (9) is connected to the parking brake air chamber (3) and the three-position four-way solenoid valve (2). Connecting pipe 3 (10) is connected to the transmission power cut-off cylinder (4) and the three-position four-way solenoid valve (2).

4. The parking brake system according to claim 3, characterized in that: The three-position four-way solenoid valve (2) comprises four interfaces, wherein the first interface is connected to the air reservoir (1) via a connecting pipe (8), the second interface is directly connected to the atmosphere, the third interface is connected to the parking brake air chamber (3) via a connecting pipe (9), and the fourth interface is connected to the transmission power cut-off cylinder (4) via a connecting pipe (10).

5. The parking brake system according to claim 4, characterized in that: When the three-position four-way solenoid valve (2) is in a parking state, the second interface is connected to the third interface and the fourth interface at the same time; when the three-position four-way solenoid valve (2) is in a driving state, the first interface is connected to the third interface and the fourth interface at the same time; when the three-position four-way solenoid valve (2) is in an emergency braking state, the first interface is connected to the fourth interface, and the second interface is connected to the third interface.

6. The parking brake system according to claim 5, characterized in that: The three-position four-way solenoid valve (2) and the air reservoir (1) are both arranged on the vehicle body, and the transmission power cut-off cylinder (4) is arranged on the speed change valve (7) of the transmission (6).

7. The parking brake system according to claim 6, characterized in that: The invention also comprises a drain valve (11) and a safety valve (12), both of which are connected to the air storage cylinder (1). The drain valve (11) is connected to the bottom of the air storage cylinder (1), and the safety valve (12) is connected to the top of the air storage cylinder (1).

Images