Hydraulic auxiliary braking system of a vehicle

Abstract

A vehicle hydraulically assisted braking system includes an axle, a transmission shaft, a reducer, a clutch, a hydraulic pump, a hydraulic oil tank, and a control valve. The axle is a hollow structure, the reducer housing is fixedly connected to the axle, the transmission shaft is positioned within the axle, and one end thereof extends to the end of the axle. The clutch is connected between the other end of the transmission shaft and the input end of the reducer to connect or disconnect the other end of the transmission shaft with the input end of the reducer. The main shaft of the hydraulic pump is connected to the output end of the reducer. The oil inlet of the hydraulic pump is connected to the hydraulic oil tank, the oil discharge port of the hydraulic pump is connected to the inlet of the control valve, and the outlet of the control valve is connected to the hydraulic oil tank to form a hydraulic circuit. The present invention reduces the impact force generated by the non-driven axle on the vehicle during braking, shortens the braking distance, improves the vehicle's braking performance, reduces friction plate wear, and protects the brake pads of the vehicle's braking system.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a hydraulic auxiliary braking system of a vehicle. Background Art

[0002] The axle is an important component of the trailer, and its main function is to bear the weight of the vehicle body. At present, the braking system of the non-driven axle of the vehicle is mostly pneumatically controlled. During braking, the pneumatic unit is controlled by the vehicle's brake pedal. When the brake pedal is operated, the pneumatic unit controls the braking system on the axle. The braking unit in the braking system rubs against the brake pads to generate braking force. For some heavy vehicles, during instantaneous braking, the braking system of the non-driven axle is far away from the pneumatic unit, and it is difficult for the braking system to respond quickly, resulting in a large inertial impact force on the non-driven axle, thereby threatening driving safety. At the same time, the friction plate is subject to greater wear, which shortens the service life of the friction plate. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a hydraulic auxiliary braking system for a vehicle, which can reduce the impact force generated by the non-driven axle on the vehicle, shorten the braking distance, and reduce the wear of the friction plate.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The vehicle's hydraulic assisted braking system includes an axle, a transmission shaft, a reducer, a clutch, a hydraulic pump, a hydraulic oil tank and a control valve. The axle is a hollow structure, the housing of the reducer is fixedly connected to the axle, the transmission shaft is placed inside the axle, and one end of the transmission shaft extends to the end of the axle; the clutch is connected between the other end of the transmission shaft and the input end of the reducer to connect or disconnect the other end of the transmission shaft with the input end of the reducer, and the main shaft of the hydraulic pump is connected to the output end of the reducer; the oil inlet of the hydraulic pump is connected to the hydraulic oil tank, the oil discharge port of the hydraulic oil pump is connected to the inlet of the control valve, and the outlet of the control valve is connected to the hydraulic oil tank to form a hydraulic circuit.

[0006] The outer shell of the reducer and the middle part of the axle together form an installation cavity. The reducer includes a transmission assembly located in the installation cavity. The transmission assembly includes an input end gear pivotally connected in the outer shell, an output end gear pivotally connected in the outer shell, and a gear set connected between the input end gear and the output end gear. The clutch is connected between one end of the transmission shaft close to the middle of the axle and the input end gear, and the hydraulic pump is synchronously connected to the output end gear.

[0007] The clutch includes multiple first friction plates, multiple second friction plates, a top pressure spring plate, and a pushing member. The multiple first friction plates and the second friction plates are arranged at intervals to form a friction plate assembly. The first friction plates are synchronously connected to the transmission shaft, and the second friction plates are synchronously connected to the input end gear. One side of the friction plate assembly abuts against the input end gear, and the top pressure spring plate is pressed on the other side of the friction plate assembly. The pushing member is used to push the top pressure spring plate so that the top pressure spring plate applies elastic stress to the friction plate assembly.

[0008] A piston is sleeved on the transmission shaft, and a fixed sleeve is fixed on the axle. The fixed sleeve is tightly matched with the piston, and a sealed cavity is formed between the fixed sleeve and the piston. A channel is provided on the fixed sleeve, one end of the channel extends to the outer surface of the axle, and the other end extends to the sealed cavity; the pusher is slidably sleeved on the transmission shaft, and the two ends of the pusher are respectively in contact with the top pressure spring and the piston.

[0009] The input end gear includes a fixed seat, a gear ring connected to the outer edge of the fixed seat, and an end cover connected to the fixed seat. The end of the transmission shaft close to the middle of the axle passes through the end cover and the fixed seat in sequence, and a mounting groove is formed between the fixed seat and the end cover. The friction plate assembly is placed in the mounting groove, one side of the friction plate assembly abuts against a side wall of the mounting groove, and the top pressure spring plate is placed between a side wall of the mounting groove and the friction plate assembly; a gap is formed between the end cover and the transmission shaft, and the end of the pusher close to the top pressure spring plate passes through the gap and abuts against the top pressure spring plate.

[0010] The hydraulic oil tank is fixed on the axle.

[0011] The housing of the hydraulic pump is fixedly connected to the outer shell of the reducer.

[0012] The beneficial effects of the present invention are:

[0013] Compared with the existing technology, the pressure-assisted braking system of the present invention starts the hydraulic pump along with the drive shaft when the vehicle brake pedal is actuated, and the hydraulic pump works on the oil in the hydraulic oil tank, quickly adding a load to the drive shaft, thereby consuming the kinetic energy of the drive shaft, and then consuming the kinetic energy of the vehicle's wheel ends, reducing the impact force of the non-driven axle on the vehicle during braking, shortening the braking distance, improving the vehicle's braking performance, reducing the loss of friction pads, and protecting the brake pads of the vehicle's braking system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the installation of the present invention;

[0016] Figure 3 is a cross-sectional view of the present invention;

[0017] Figure 4 for Figure 3 Magnified view at point A in the middle. DETAILED DESCRIPTION

[0018] Below, in conjunction with the accompanying drawings and specific embodiments, the present invention is further described:

[0019] like Figure 1 、 2 , 3, and 4 show a hydraulic auxiliary braking system for a vehicle of the present invention, which includes an axle 10, a transmission shaft 20, a reducer 30, a clutch 60, a hydraulic pump 40, a hydraulic oil tank 50, and a control valve. The axle 10 is a hollow structure. Specifically, an axial hole is formed inside the axle 10. The axial hole extends roughly from the middle of the axle 10 to one end of the axle 10. The reducer 30 includes a housing 31 and a transmission assembly. The housing 31 is fixedly connected to the middle of the axle 10. After the housing 31 and the axle 10 are fixed, the two of them form a mounting cavity. The transmission shaft 20 is connected to the axial hole of the axle. The transmission shaft One end of the drive shaft 20 extends to the end of the axle 10 and is used to connect to the wheel located at the end of the axle 10 to transmit power. The other end of the drive shaft 20 extends into the installation cavity. The clutch 60 is connected between the other end of the drive shaft 20 and the input end of the transmission assembly of the reducer 30. The clutch 60 is used to connect or disconnect the other end of the drive shaft 20 with the input end of the reducer 30. That is, in one state, the clutch 60 can connect the drive shaft 20 with the input end of the reducer 30 to realize power transmission. In another state, the drive shaft 20 can be disconnected from the reducer 30 to disconnect the power transmission between the two. The main shaft of the hydraulic pump 40 is connected to the output end of the transmission assembly of the reducer 30, and the hydraulic pump 40 can be driven by the output end of the reducer 30. The oil inlet of the hydraulic pump 40 is connected to the hydraulic oil tank 50 via a pipeline, the oil outlet of the hydraulic pump 40 is connected to the inlet of the control valve via a pipeline, and the outlet of the control valve is connected to the hydraulic oil tank 50 via a pipeline. Thus, the hydraulic pump 40, the control valve, and the hydraulic oil tank 50 form a hydraulic circuit. The hydraulic oil tank 50 can be fixed to the vehicle frame or the axle 10.

[0020] When the vehicle brakes, the vehicle brake pedal is actuated, and the clutch 60 quickly connects the drive shaft 20 to the input end of the reducer 30. At this time, the reducer transmits the power of the drive shaft 20 to the hydraulic pump 40, driving the main shaft of the hydraulic pump 40 to rotate. The hydraulic pump 40 draws oil from the hydraulic oil tank 50, and the oil overflows back to the hydraulic oil tank after passing through the control valve, thereby consuming the kinetic energy of the drive shaft 20, and then playing a role in auxiliary braking of the wheel end of the vehicle.

[0021] When the vehicle brake pedal is not in action, the clutch 60 controls the input end of the reducer 30 to be disconnected from the drive shaft 20. At this time, no power is transmitted to the main shaft of the hydraulic pump 40. The hydraulic pump 40 is in a non-working state, the displacement is zero, the hydraulic auxiliary braking system is in a non-working state, and there is no additional load on the drive shaft 20. At this time, the drive shaft 20 idles with the wheels, and the vehicle runs normally.

[0022] Compared with the existing technology, the pressure-assisted braking system of the present invention starts the hydraulic pump along with the drive shaft when the vehicle brake pedal is actuated, and the hydraulic pump works on the oil in the hydraulic oil tank, quickly adding a load to the drive shaft, thereby consuming the kinetic energy of the drive shaft, and then consuming the kinetic energy of the vehicle's wheel ends, reducing the impact force of the non-driven axle on the vehicle during braking, shortening the braking distance, improving the vehicle's braking performance, reducing the loss of friction pads, and protecting the brake pads of the vehicle's braking system.

[0023] The reducer 30 of the present invention is a gear reducer, and its transmission assembly includes an input end gear 320, an output end gear 33, and a gear set located in the installation cavity, wherein the input end gear 320 and the output end gear 33 are both pivotally connected to the housing 31, or the input end gear 320 can be pivotally connected to the axle 10, or pivotally connected at a position between the axle 10 and the housing 31, the gear set is connected between the output end gear 320 and the output end gear 33, and the specific gear set is respectively engaged with the input end gear 320 and the output end gear 33, the clutch 60 is connected between the input end gear 320 and one end of the transmission shaft 20 near the middle of the axle 10, the housing of the hydraulic pump 40 is fixedly connected to the housing 31, and the main shaft of the hydraulic pump 40 is synchronously connected to the output end gear 33.

[0024] The above-mentioned clutch 60 specifically includes a plurality of first friction plates 62, a plurality of second friction plates 61, a top pressure spring plate 63, and a pushing member 67, wherein the plurality of first friction plates 62 and the plurality of second friction plates 61 are arranged at intervals to form a friction plate assembly, the first friction plates 62 and the second friction plates 61 are annular, and the inner edge of the first friction plate 62 and the outer periphery of the transmission shaft 20 are provided with splines that cooperate with each other, so as to synchronously connect the first friction plate 62 and the transmission shaft 20, and the outer periphery of the second friction plate 61 is provided with a flange, and a recess for the flange to be embedded is provided on the input end gear 320, so that the second friction plate 61 is synchronously connected to the input end gear, and the above-mentioned friction plate assembly is placed between the top pressure spring plate 63 and the input end gear 320. Specifically, one side of the friction plate assembly abuts on the input end gear, and the other side abuts on the input end gear. The first and second friction plates 62 and 61 are pressed against each other, and a plurality of first friction plates 62 and a plurality of second friction plates 61 are pressed against each other, generating a large friction force, thereby synchronously connecting the transmission shaft 20 and the input end gear 320; when it is necessary to disconnect the power transmission between the transmission shaft 20 and the input end gear 320, the pushing member 67 moves in a direction away from the top pressure spring plate 63, and the plurality of first friction plates 62 and the second friction plates 61 are loosened, so that the transmission shaft 20 can rotate relative to the input end gear 320. The above-mentioned pushing member 67 can be controlled by the vehicle's brake pedal. For example, when the vehicle's brake pedal is actuated, a signal is transmitted to a motor or other type of driving unit that drives the pushing member 67 to move, driving the pushing member 67 to move axially along the transmission shaft 20 to push the top pressure spring 63. When the brake pedal is reset, the driving unit is controlled by a signal to reset the pushing member 67.

[0025] In the present invention, in order to achieve a rapid response of the clutch 60 so that the hydraulic auxiliary brake system can intervene quickly when the vehicle brakes, the present invention preferably uses a hydraulic drive method to drive the above-mentioned pusher 67 to move to compress the first friction plate 62 and the second friction plate 61. Specifically, a piston 66 is sleeved on the transmission shaft 20, and a fixed sleeve 65 is fixed inside the axle 10. The fixed sleeve 65 is sleeved on the outside of the piston 66 and is tightly matched with the piston. A sealed chamber is formed between the fixed sleeve 65 and the piston 66. In this way, a hydraulic cylinder is formed by using the fixed sleeve 65 and the piston 66. A channel is provided on the fixed sleeve 65. One end of the channel extends to the outer surface of the axle 10 and the other end extends to the sealed The sealed cavity and the channel extend to one end of the outer surface of the axle 10 and are connected to the vehicle's hydraulic system. The above-mentioned pusher 67 is a hollow cylindrical structure, which is slidably mounted on the transmission shaft 20. The two ends of the pusher 67 are respectively in contact with the top pressure spring 63 and the piston 66. When the vehicle brakes, the vehicle's hydraulic braking system distributes a very small part of the liquid pressure to the hydraulic auxiliary braking system of the present invention through the above-mentioned channel, and uses the piston 66 to drive the pusher 67 to move, so as to quickly synchronize the transmission shaft 20 with the input end gear 320. In this way, the clutch 60 can respond quickly, shortening the reaction time of the hydraulic auxiliary braking system, that is, the hydraulic auxiliary braking system can intervene in time and participate in the braking process of the vehicle. An oil inlet nozzle 64 may be fixed on the housing 31 of the axle 20 or the reducer 30. The oil inlet nozzle 64 extends into the interior of the axle 10 and is connected to the fixed sleeve 65. A through hole is provided on the fixed sleeve 65. The through hole connects the oil path of the oil inlet nozzle 64 with the above-mentioned sealed cavity, that is, the through hole and the oil path inside the oil inlet nozzle 64 constitute the above-mentioned channel.

[0026] In order to facilitate installation, the input end gear 320 of the present invention includes a fixed seat 34, a ring gear 32, and an end cover 35, wherein the fixed seat 34 and the end cover 35 are both annular, and the end cover 35 is fixed to the fixed seat 34 by bolts. The end of the transmission shaft 20 near the middle of the axle 10 passes through the end cover 35 and the fixed seat 34 in sequence, and the ring gear 32 is connected to the outer edge of the fixed seat 34. The gear set of the reducer 30 is engaged, and a mounting groove is formed between the end cover 35 and the fixed seat 34. The above-mentioned friction plate assembly The friction plate assembly is placed in the mounting groove, and the pressing spring piece 63 can also be placed in the mounting groove. The two side walls of the mounting groove are respectively located on the fixing seat 34 and the end cover 35. One side of the friction plate assembly abuts against the side wall of the mounting groove located on the fixing seat 34. The pressing spring piece 63 is located between the side wall of the mounting groove located on the end cover 35 and the friction plate assembly. A gap is formed between the end cover 35 and the transmission shaft 20. The end of the pushing member 67 close to the friction plate assembly passes through the gap and abuts against the pressing spring piece 63. During installation, the friction plate assembly and the pressing spring piece 63 can be placed between the end cover 35 and the fixing seat 34, and the end cover 35 and the fixing seat 34 are fixed with bolts to form an assembly, which is then assembled with other components.

[0027] The clutch 60 described above can respond quickly when the vehicle is braked. In fact, in other embodiments, the clutch of the present invention can also adopt other structures that can achieve the connection and disconnection of the transmission shaft 20 and the input end gear 320.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulically assisted braking system for a vehicle, characterized in that: The vehicle axle comprises a transmission shaft, a reducer, a clutch, a hydraulic pump, a hydraulic oil tank, and a control valve. The vehicle axle is a hollow structure. The housing of the reducer is fixedly connected to the vehicle axle. The transmission shaft is placed inside the vehicle axle, and one end of the transmission shaft extends to the end of the vehicle axle. The clutch is connected between the other end of the transmission shaft and the input end of the reducer to connect or disconnect the other end of the transmission shaft with the input end of the reducer. The main shaft of the hydraulic pump is connected to the output end of the reducer. The oil inlet of the hydraulic pump is connected to the hydraulic oil tank, the oil discharge port of the hydraulic pump is connected to the inlet of the control valve, and the outlet of the control valve is connected to the hydraulic oil tank to form a hydraulic circuit. The housing of the reducer and the middle part of the axle together form an installation cavity. The reducer includes a transmission assembly located in the installation cavity. The transmission assembly includes an input end gear pivotally connected to the housing, an output end gear pivotally connected to the housing, and a gear set connected between the input end gear and the output end gear. The clutch is connected between the end of the transmission shaft near the middle part of the axle and the input end gear. The hydraulic pump is synchronously connected to the output end gear. The clutch includes a plurality of first friction plates, a plurality of second friction plates, a pressing spring plate, and a pushing member. The plurality of first friction plates and second friction plates are arranged at intervals to form a friction plate assembly. The first friction plates are synchronously connected to the transmission shaft, and the second friction plates are synchronously connected to the input end gear. One side of the friction plate assembly abuts against the input end gear, and the pressing spring plate is pressed against the other side of the friction plate assembly. The pushing member is used to push the pressing spring plate so that the pressing spring plate applies elastic stress to the friction plate assembly. A piston is sleeved on the transmission shaft, and a fixed sleeve is fixed on the axle. The fixed sleeve is tightly matched with the piston, and a sealed cavity is formed between the fixed sleeve and the piston. A channel is provided on the fixed sleeve, one end of the channel extends to the outer surface of the axle, and the other end extends to the sealed cavity; the pusher is slidably sleeved on the transmission shaft, and the two ends of the pusher are respectively in contact with the top pressure spring and the piston.

2. The hydraulic auxiliary braking system for a vehicle according to claim 1, wherein: The input end gear includes a fixed seat, a gear ring connected to the outer edge of the fixed seat, and an end cover connected to the fixed seat. The end of the transmission shaft close to the middle of the axle passes through the end cover and the fixed seat in sequence, and a mounting groove is formed between the fixed seat and the end cover. The friction plate assembly is placed in the mounting groove, one side of the friction plate assembly abuts against one side wall of the mounting groove, and the top pressure spring is placed between the other side wall of the mounting groove and the friction plate assembly; a gap is formed between the end cover and the transmission shaft, and the end of the pusher close to the top pressure spring passes through the gap and abuts on the top pressure spring.

3. The hydraulic auxiliary braking system for a vehicle according to claim 1, wherein: The hydraulic oil tank is fixedly installed on the axle.

4. The hydraulic auxiliary braking system for a vehicle according to claim 1, wherein: The housing of the hydraulic pump is fixedly connected to the outer shell of the reducer.

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