阅读说明：本技术 增压式缓速器用增速箱 (Speed increasing box for booster-type retarder ) 是由 刘静 李跃强 吴建曲 朱昌金 葛垚 陈岩 邵俊凯 张璇 张一铭 刘逸果 刘懿铭 于 2020-12-29 设计创作，主要内容包括：本发明公开了一种增压式缓速器用增速箱,包括增速箱体,所述增速箱体内设有输入轴和输出轴,所述输入轴与所述动力万向轴之间传动连接,所述输出轴与所述旋转轴之间传动连接,所述输出轴与所述输入轴之间设有变速机构并使所述输出轴与所述输入轴之间的传动比可在等于1与大于1之间切换。本发明的增压式缓速器用增速箱,采用该增速箱的增压式缓速器能够提高低速制动效果。(The invention discloses a speed increasing box for a supercharged retarder, which comprises a speed increasing box body, wherein an input shaft and an output shaft are arranged in the speed increasing box body, the input shaft is in transmission connection with a power universal shaft, the output shaft is in transmission connection with a rotating shaft, a speed changing mechanism is arranged between the output shaft and the input shaft, and the transmission ratio between the output shaft and the input shaft can be switched between 1 and more than 1. According to the speed increasing box for the supercharged retarder, the supercharged retarder adopting the speed increasing box can improve the low-speed braking effect.)

1. The utility model provides a booster-type is acceleration rate case for retarder which characterized in that: the power transmission device comprises a speed increasing box body (305), wherein an input shaft (306) and an output shaft (307) are arranged in the speed increasing box body (305), the input shaft (306) is in transmission connection with a power universal shaft (12), the output shaft (307) is in transmission connection with a rotating shaft (401), a speed changing mechanism is arranged between the output shaft (307) and the input shaft (306), and the transmission ratio between the output shaft (307) and the input shaft (306) can be switched between 1 and more than 1.

2. The gearbox for a booster-type retarder according to claim 1, characterized in that: a stepless speed change mechanism is arranged between the input shaft (306) and the output shaft (307); or a gear speed change mechanism is arranged between the input shaft (306) and the output shaft (307).

3. The gearbox for a booster-type retarder according to claim 2, characterized in that: the gear speed change mechanism comprises a double-linkage gear shaft (308), and a first gear (309) and a second gear (310) which synchronously rotate with the double-linkage gear shaft (308) are arranged on the double-linkage gear shaft; the input shaft (306) and the output shaft (307) are coaxially arranged, an input gear (311) meshed with the first gear (309) is arranged on the input shaft (306), an output gear (312) meshed with the second gear (310) is arranged on the output shaft (307), a synchronizer (313) is arranged between the input shaft (306) and the output shaft (307), and a gear shifting mechanism used for driving the synchronizer (313) to move and enabling the input shaft (306) and the output shaft (307) to synchronously rotate or enabling the input shaft (306) and the output shaft (307) to rotate independently is arranged on the speed increasing box body (305).

4. The gearbox for a booster-type retarder according to claim 3, characterized in that: the transmission ratio between the input gear (311) and the first gear (309) is less than 1, and the transmission ratio between the second gear (310) and the output gear (312) is less than 1.

5. The gearbox for a booster-type retarder according to claim 3, characterized in that: the input gear (311) is sleeved on the input shaft (306) in a rotating fit mode, and the output gear (312) and the output shaft (307) rotate synchronously; the synchronizer (313) is positioned between the input gear (311) and the output gear (312), the synchronizer (313) is in single-degree-of-freedom sliding fit with the input shaft (306), and synchronous combination structures are arranged between the input gear (311) and the output gear (312) and the synchronizer (313).

6. The gearbox for a booster-type retarder according to claim 5, characterized in that: the synchronous combination structure comprises synchronous insertion holes (314) which are respectively and annularly and uniformly distributed on the side surfaces of two sides of the synchronizer (313), and synchronous insertion columns (315, 316) which are used for being matched with the corresponding synchronous insertion holes (314) are respectively arranged on one opposite side of the input gear (311) and the output gear (312).

7. The gearbox for a booster-type retarder according to claim 5, characterized in that: the synchronizer (313) is in spline fit with the input shaft (306).

8. The gearbox for a booster-type retarder according to claim 3, characterized in that: the gear shifting mechanism comprises a gear shifting cylinder (317), a rotating fit, a shifting block piece (318) on the speed increasing box body (305) and a shifting fork (319) used for driving the synchronizer (313) to move, the cylinder body of the gear shifting cylinder (317) is hinged to the speed increasing box body (305), a piston rod is hinged to one end of the shifting block piece (318), and the shifting fork (319) is hinged to the other end of the shifting block piece (318).

9. The gearbox for a booster-type retarder according to claim 8, characterized in that: and an electromagnetic directional valve and a control circuit for controlling the action of the electromagnetic directional valve are arranged on the gas path of the gear shifting cylinder (317).

Technical Field

The invention belongs to the technical field of mechanical transmission, and particularly relates to a speed increasing box for a booster-type retarder.

Background

Chinese patent publication No. CN105221617B discloses a liquid-vortex retarder for a vehicle, which comprises a liquid-resistance retarder pump, a clutch device, a transmission device, a high-pressure circulating pump and a water cooling device; the water cooling device comprises a cooling box and a fan device; the liquid resistance retarding pump comprises a pump body, a main shaft and a pump wheel on the main shaft; one end of the main shaft is connected with an output shaft of the automobile gearbox, and the other end of the main shaft is connected with a transmission shaft of an automobile rear axle; the pump body is provided with an inlet and an outlet, the outlet is connected with a cooling tank of the water cooling device, and the inlet is connected with the cooling tank through a high-pressure circulating pump; one end of the main shaft, which is close to a rear axle of the automobile, is connected with a clutch device through gear transmission, the clutch device is connected with a transmission device through a power universal shaft, and the transmission device is respectively connected with a rotating shaft of a high-pressure circulating pump and a fan shaft of a fan device; the transmission device comprises a box body, wherein a first shaft is arranged in the box body, one end of the first shaft is connected with a power universal shaft, the other end of the first shaft is connected with a second shaft through gear transmission, the second shaft is connected with a third shaft through gear transmission, and one end of the third shaft is connected with a fan shaft of the fan device through belt transmission; the third shaft is connected with one end of a rotating shaft of the high-pressure circulating pump through gear transmission; the clutch device comprises a clutch gear in transmission connection with a gear at one end of a main shaft in the hydraulic resistance retarder pump, a clutch support, a clutch main body, a pneumatic valve for controlling the clutch main body and a clutch gear box fixedly connected to a pump body of the hydraulic resistance retarder pump; the cooling box is externally connected with a liquid supplementing medium box; the cooling box is provided with a degassing connector and is connected with a liquid supplementing medium box cover through a hose, and the liquid supplementing medium box cover is provided with a one-way valve.

This automobile-used retarber of liquid vortex can satisfy the technical purpose of supplementary vehicle deceleration, nevertheless will reach braking effect, need provide the rivers of sufficient pressure for the liquid hinders retarder pump, needs the rivers of high-pressure circulating pump output promptly to have sufficient water pressure, and high-pressure circulating pump needs to reach sufficient rotational speed. However, as the vehicle speed decreases, the rotating speed of the main shaft connected to the output shaft of the transmission decreases, which in turn causes the rotating speed of the rotating shaft of the high-pressure circulating pump in transmission connection with the main shaft to decrease, which causes the water pressure of the water flow output by the high-pressure circulating pump to decrease, i.e. the water pressure in the hydraulic resistance retarder pump decreases, and finally causes the hydraulic eddy current vehicle retarder to fail to have a sufficient braking effect. The hydrodynamic eddy current retarder for the vehicle has a sufficient braking effect under a higher parking space condition, but the braking effect is reduced after the vehicle speed is reduced, namely the hydrodynamic eddy current retarder for the vehicle cannot meet the braking requirement of a low-speed vehicle.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a speed increasing box for a booster-type retarder, and a booster-type retarder using the speed increasing box can improve a low-speed braking effect.

In order to achieve the purpose, the invention provides the following technical scheme:

the speed increasing box comprises a speed increasing box body, wherein an input shaft and an output shaft are arranged in the speed increasing box body, the input shaft is in transmission connection with a power universal shaft, the output shaft is in transmission connection with a rotating shaft, a speed changing mechanism is arranged between the output shaft and the input shaft, and the transmission ratio between the output shaft and the input shaft can be switched between 1 and more than 1.

Further, a stepless speed change mechanism is arranged between the input shaft and the output shaft; or a gear speed change mechanism is arranged between the input shaft and the output shaft.

Furthermore, the gear speed change mechanism comprises a dual-gear shaft, and a first gear and a second gear which rotate synchronously with the dual-gear shaft are arranged on the dual-gear shaft; the input shaft and the output shaft are coaxially arranged, an input gear meshed with the first gear is arranged on the input shaft, an output gear meshed with the second gear is arranged on the output shaft, a synchronizer is arranged between the input shaft and the output shaft, and a gear shifting mechanism used for driving the synchronizer to move and enabling the input shaft and the output shaft to synchronously rotate or enabling the input shaft and the output shaft to rotate independently is arranged on the speed increasing box body.

Further, the transmission ratio between the input gear and the first gear is less than 1, and the transmission ratio between the second gear and the output gear is less than 1.

Further, the input gear is sleeved on the input shaft in a rotating fit mode, and the output gear and the output shaft rotate synchronously; the synchronizer is positioned between the input gear and the output gear, the synchronizer is in single-degree-of-freedom sliding fit with the input shaft, and synchronous combination structures are arranged between the input gear and the synchronizer and between the output gear and the synchronizer respectively.

Furthermore, synchronous integrated structure is in including the annular equipartition setting respectively synchronous jack on the side of synchronizer both sides, input gear with one side that output gear is in opposite directions is equipped with respectively and is used for with corresponding synchronous jack complex is inserted the post in step.

Further, the synchronizer is in spline fit with the input shaft.

Further, the gear shifting mechanism comprises a gear shifting cylinder, a shifting block piece which is arranged on the speed increasing box in a rotating fit mode and a shifting fork which is used for driving the synchronizer to move, the cylinder body of the gear shifting cylinder is hinged to the speed increasing box, the piston rod is hinged to one end of the shifting block piece, and the shifting fork is hinged to the other end of the shifting block piece.

Furthermore, an electromagnetic directional valve and a control circuit for controlling the action of the electromagnetic directional valve are arranged on the gas circuit of the gear shifting cylinder.

The invention has the beneficial effects that:

the speed increasing box for the booster-type retarder can switch the transmission ratio between the output shaft and the input shaft between 1 and more than 1 by arranging the speed changing mechanism, so that when the rotating speed of a main shaft is higher, the transmission ratio of the speed increasing box is 1 by adopting the booster-type retarder of the speed increasing box, the booster-type retarder can realize retarding braking like a traditional retarder, and the high-pressure circulating pump can provide a high-pressure liquid medium for a liquid resistance retarding pump, so that the technical purpose of braking can be achieved; along with the reduction of the rotating speed, the pressure of the liquid medium provided by the high-pressure circulating pump is lower, the braking effect is obviously reduced, at the moment, the transmission ratio of the speed increasing box is larger than 1 through the speed changing mechanism, so that the pressure of the liquid medium output by the high-pressure circulating pump is increased, and the braking effect is improved; therefore, the booster-type retarder can achieve ideal braking effects under the conditions of high rotating speed and low rotating speed respectively by arranging the speed increasing box and switching the transmission ratio of the speed increasing box according to the rotating speed.

Drawings

In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:

FIG. 1 is a schematic structural view of an embodiment of a speed increasing box for a booster type retarder;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a cross-sectional view B-B of FIG. 3;

FIG. 5 is a schematic view of a booster-type retarder using the speed increasing box of the present invention;

FIG. 6 is a schematic view of the transmission;

fig. 7 is a cross-sectional view taken along line C-C of fig. 6.

Description of reference numerals:

1, a liquid resistance retarding pump; 2, a clutch device; 3, a transmission device; 4, a high-pressure circulating pump; 5 a liquid medium tank; 6 a fan device; 7 a gearbox output shaft; 8 rear axle drive shafts; 9, a solenoid valve; 10 flow control valves; 11 a one-way valve; 12. a power cardan shaft; 13 supplementing a liquid medium box; 14, supplementing a liquid medium box cover;

101 a pump body; 102 a main shaft; 103 front pump wheel; 104 rear pump wheel; 105 an inlet; 106 an outlet; 107 a main body; positioning the box in front of 108; 109, positioning the box body; (ii) a 110 bearings; 111 a front flange; 112 rear flange; 201 clutch gear; 202 a clutch support; 203 a clutch body; 204 a pneumatic valve; 205 a clutch gearbox; 301 a box body; 302 a transmission; 303 a first shaft; 304 a second axis; 305 a box body; 306 an input shaft; 307 an output shaft; 308 a double-link gear shaft; 309 a first gear; 310 a second gear; 311-input gear; 312 output gear; 313 a synchronizer; 314 synchronous jacks; 315 synchronous inserting columns; 316 synchronous plug-in post; 317 a gear shifting cylinder; 318 changing the blocking sheet; 319 shifting fork;

401 rotating the shaft; 501, degassing an interface; 601 a fan protection cover; 602 a fan support; 603 fan axis; 604 fan blades.

Detailed Description

The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.

As shown in fig. 1, a schematic structural view of an embodiment of a speed increasing box for a booster-type retarder is shown. The speed increasing box for the booster-type retarder of the embodiment comprises a speed increasing box body 305, wherein an input shaft 306 and an output shaft 307 are arranged in the speed increasing box body 305, the input shaft 306 is in transmission connection with the power universal shaft 12, the output shaft 307 is in transmission connection with the rotating shaft 401, a speed changing mechanism is arranged between the output shaft 307 and the input shaft 306, and the transmission ratio between the output shaft 307 and the input shaft 306 can be switched between 1 and more than 1.

Further, a stepless speed change mechanism is arranged between the input shaft 306 and the output shaft 307; or a gear change mechanism is arranged between the input shaft 306 and the output shaft 307. A gear change mechanism is provided between the input shaft 306 and the output shaft 307 in the present embodiment. Specifically, the gear shifting mechanism comprises a dual-gear shaft 308, and a first gear 309 and a second gear 310 which rotate synchronously with the dual-gear shaft 308 are arranged on the dual-gear shaft 308; the input shaft 306 and the output shaft 307 are coaxially arranged, an input gear 311 meshed with the first gear 309 is arranged on the input shaft 306, an output gear 312 meshed with the second gear 310 is arranged on the output shaft 307, a synchronizer 313 is arranged between the input shaft 306 and the output shaft 307, and a gear shifting mechanism for driving the synchronizer 313 to move and enabling the input shaft 306 and the output shaft 307 to synchronously rotate or enabling the input shaft 306 and the output shaft 307 to rotate independently is arranged on the speed increasing box body 305. Specifically, the transmission ratio between the input gear 311 and the first gear 309 of the present embodiment is less than 1, and the transmission ratio between the second gear 310 and the output gear 312 is less than 1.

Further, an input gear 311 of the present embodiment is rotatably fitted around the input shaft 306, and an output gear 312 and the output shaft 307 rotate synchronously; the synchronizer 313 is positioned between the input gear 311 and the output gear 312, the synchronizer 313 is in single-degree-of-freedom sliding fit with the input shaft 306, and a synchronous combination structure is arranged between the input gear 311 and the synchronizer 313 as well as between the output gear 312 and the synchronizer 313. Specifically, the synchronous combination structure includes synchronous jacks 314 respectively annularly and uniformly arranged on the side surfaces of two sides of the synchronizer 313, one opposite side of the input gear 311 and the output gear 312 is respectively provided with a synchronous inserting column 315 and a synchronous inserting column 316 which are used for being matched with the corresponding synchronous jack 314, the synchronous jack 314 of the embodiment adopts a waist-shaped round hole of an arc line with the axis coaxial with the synchronizer 313, and the synchronous inserting columns 315 and 316 are cylindrical inserting columns. Preferably, the synchronizer 313 of the present embodiment is in spline fit with the input shaft 306. When the synchronizer 313 slides to one side of the input gear 311, the synchronizing insertion pin 315 provided on the input gear 311 is inserted into the synchronizing insertion hole 314, so that the input gear 311 rotates in synchronization with the synchronizer 313, that is, the input gear 311 rotates in synchronization with the input shaft 306. When the synchronizer 311 slides to the side of the output gear 312, the synchronization plug 316 arranged on the output gear 312 is inserted into the synchronization insertion hole 314, so that the output gear 312 and the synchronizer 313 rotate synchronously, the spline between the synchronizer 313 and the input shaft 306 is in a meshing state at the moment, even if the output gear 312 and the input shaft 306 rotate synchronously, the input gear 311 and the input shaft 306 are in a rotating matching state at the moment, and the first gear 309 and the second gear 310 are not interfered.

Further, the gear shifting mechanism comprises a gear shifting cylinder 317, a shift plate 318 and a shifting fork 319, wherein the shift plate 318 is installed on the speed increasing box body 305 in a rotating fit mode, the shifting fork 319 is used for driving the synchronizer 313 to move, a cylinder body of the gear shifting cylinder 317 is hinged to the speed increasing box body 305, a piston rod of the gear shifting cylinder 317 is hinged to one end of the shift plate 318, the shifting fork 319 is hinged to the other end of the shift plate 318, the piston rod of the gear shifting cylinder 317 and the shifting fork 319 are respectively located on two sides of the rotating axis of the shift plate 318, the shift plate 318 is driven to rotate through the gear shifting cylinder 317, the shifting fork 319 is further driven to move, the synchronizer 313 is driven to slide on the input shaft 306, and the technical purpose.

Specifically, as shown in fig. 5, a schematic structural diagram of a supercharged retarder using the speed increasing box of the present invention is shown. The booster retarder comprises a liquid resistance retarder pump 1, a clutch device 2, a transmission device 3, a high-pressure circulating pump 4 and a liquid medium tank 5. The liquid resistance retarder pump 1 comprises a pump body 101, a main shaft 102 and a pump wheel on the main shaft 102, wherein the pump body is provided with an inlet 105 and an outlet 106, the outlet 106 is connected with a liquid medium box 5, and a one-way valve 11 and a flow control valve 10 are arranged between the liquid resistance retarder pump and the liquid medium box; the inlet 105 is connected with the liquid medium tank 5 through the high-pressure circulating pump 4, and an electromagnetic valve 9 is arranged between the inlet 105 and the high-pressure circulating pump 4; the main shaft 102 is in transmission connection with a clutch device 2 through a gear transmission mechanism, the clutch device 2 is connected with a transmission device 3 through a power universal shaft 12, and the transmission device 3 is connected with a rotating shaft 401 of a high-pressure circulating pump 4.

Specifically, the pump body 101 includes a main body 107, a front positioning box 108 and a rear positioning box 109, the main shaft 102 penetrates through the main body 107, the front positioning box 108 and the rear positioning box 109, and the main shaft 102 is connected with the front positioning box and the rear positioning box through bearings 110; the pump impeller includes a front pump impeller 103 and a rear pump impeller 104, and forms a plurality of spiral vortex chambers with the pump body 101, respectively.

The transmission device 3 comprises a speed increasing box 302 and a gear transmission box of the embodiment, the gear transmission box comprises a box body 301, a first shaft 303 and a second shaft 304 are arranged in the gear box body 301, one end of the first shaft 303 is in transmission connection with an output shaft 307, the other end of the first shaft 303 is in transmission connection with a rotating shaft 401, the first shaft 303 is in transmission connection with the second shaft 304, and the second shaft 304 is in transmission connection with a fan shaft 603 of the fan device 6 through a belt transmission mechanism.

The clutch device 2 comprises a clutch gear 201 in gear transmission connection with one end of a main shaft 102 in the hydraulic retarder pump 1, a clutch support 202, a clutch main body 203, an air-operated valve 204 for controlling the clutch main body 203, and a clutch gear box 205 fixedly connected to the pump body 101 of the hydraulic retarder pump 1.

The liquid medium tank 5 is connected with the liquid medium supplementing tank 13 through a hose, and the liquid medium can be directly added into the liquid medium tank 5 from the liquid medium supplementing tank 13. The liquid medium box 5 is provided with a degassing connector 501, and is connected with a liquid medium supplementing box cover 14 through a hose, and the liquid medium supplementing box cover 14 is provided with a one-way valve. When the temperature in the liquid medium box 5 rises, the air pressure in the liquid medium box 5 rises, and the air is discharged from the degassing interface 501 to the liquid supplementing box cover 14 and the one-way valve; when the air pressure is reduced, the check valve on the liquid supplementing medium tank cover 14 is closed.

Further, an electromagnetic directional valve and a control circuit for controlling the electromagnetic directional valve to act are arranged on the gas path of the shift cylinder 317, so that automatic control is facilitated. Specifically, the control circuit is connected with a traveling computer, and the traveling computer is also connected with a rotating speed sensor for detecting the rotating speed of the main shaft 102 and a clutch signal sensor for detecting the clutch state of the clutch device 2; the driving computer collects the rotating speed data collected by the rotating speed sensor and the clutch signal data collected by the clutch signal sensor in real time, when the clutch device 2 is in a combined state and the rotating speed of the main shaft 102 is lower than a set threshold value, the control circuit controls the action of the electromagnetic directional valve, so that the transmission ratio of the speed increasing box 302 is greater than 1, and the synchronizer 313 and the input gear 311 are meshed for synchronous rotation at the moment; when the clutch device 2 is in the engaged state and the rotation speed of the main shaft 102 is not lower than the set threshold value, the control circuit controls the electromagnetic directional valve to act, so that the transmission ratio of the speed increasing box 302 is equal to 1, namely, the synchronizer 313 and the output gear 312 are meshed and synchronously rotate at the moment.

Further, the booster retarder also comprises a fan arrangement 6 for cooling the liquid medium in the liquid medium tank 5; the fan device 6 includes a fan guard 601 fixed to the cooling box 5, a fan bracket 602 fixed to the vehicle, a fan shaft 603 in the bracket, and fan blades 604 at one end of the fan shaft 603. The transmission device 3 further comprises a gear transmission box, the gear transmission box comprises a gear box body 301, a first shaft 303 and a second shaft 304 are arranged in the gear box body 301, one end of the first shaft 303 is in transmission connection with an output shaft 307, the other end of the first shaft 303 is in transmission connection with a rotating shaft 401, the first shaft 303 is in transmission connection with the second shaft 304, and the second shaft 304 is in transmission connection with a fan shaft 603 of the fan device 6.

Specifically, in the in-service use, according to the difference of motorcycle type, can select the installation connection mode of this embodiment automobile-used retarber of liquid vortex in a flexible way. When the chassis of the vehicle body is an integrated chassis, two ends of the main shaft 102 can be respectively connected with the output shaft 7 of the gearbox and the rear axle transmission shaft 8; when the chassis of the vehicle body is arranged in a split manner, the vehicle body is divided into a tractor and a trailer, at least one wheel axle of the trailer can be set into a half shaft with a differential mechanism, the main shaft 301 is connected with a transmission shaft of the differential mechanism, the differential mechanism transmission shaft is braked, and then the whole vehicle body is braked.

In the running process of the automobile, the transmission case output shaft 7 or the rear axle transmission shaft 8 or the differential transmission shaft can drive the main shaft 102 to rotate, and in a normal state, no liquid medium exists in the liquid resistance retarder pump 1, and the automobile runs normally in a liquid resistance-free state.

When the automobile needs to be braked, the speed of the automobile is higher at this time, the rotating speed of the main shaft 102 is higher, that is, the rotating speed of the rotating shaft 401 is higher, the high-pressure circulating pump can provide liquid medium pressure meeting braking requirements for the hydraulic resistance retarder pump 1, at this time, the transmission ratio of the speed increasing box 302 is controlled to be equal to 1, the electromagnetic valve 9 and the flow control valve 10 are opened, the clutch pneumatic valve 204 is opened, the main shaft 102, the clutch device 2 and the transmission device 3 form a power transmission state, the main shaft 102 transmits power to drive the rotating shaft 401 of the high-pressure circulating pump 4 to rotate, the rotating shaft 401 drives the impeller in the high-pressure circulating pump 4 to rotate, so that the high-pressure circulating pump 4 operates, the liquid medium in the liquid medium box 5 is led to the hydraulic resistance retarder pump 1 along a conveying pipeline, the liquid medium is driven by the front pump impeller 101 and the rear pump impeller 102 to, the liquid medium flows out of the one-way valve 11 and returns to the liquid medium tank 5 through the flow control valve 10 to form a self-circulation liquid circulation system;

along with the reduction of the automobile speed, the rotating speed of the main shaft 102 is reduced, that is, the rotating speed of the rotating shaft 401 is also reduced, the high-pressure circulating pump cannot provide liquid medium pressure meeting the braking requirement for the liquid resistance retarder pump 1, at the moment, the transmission ratio of the speed increasing box 302 is controlled to be greater than 1 so as to improve the rotating speed of the rotating shaft 401, the rotating shaft 401 drives an impeller in the high-pressure circulating pump 4 to rotate, so that the high-pressure circulating pump 4 can recover to operate efficiently, and the technical effect of low-speed braking is achieved.

The second shaft 304 of the transmission device 3 is in transmission connection with the fan shaft 603 of the fan device 6 through a belt transmission mechanism, the fan shaft 603 drives the fan blades 604 to rotate, the liquid medium box 5 is provided with radiating fins, the fan device 6 can blow heat of the radiating fins, so that a self-circulation radiating system is formed,

when the automobile does not need to be braked, the clutch pneumatic valve 204 is closed, the clutch device is enabled to be disconnected from the power transmission state of the main shaft 102 and the transmission device 3, the electromagnetic valve 9 is closed, the liquid circulation system is disconnected, the flow control valve 10 can be opened to be in the maximum flow state, the liquid medium in the hydraulic resistance retarder pump 1 flows into the liquid medium box 5 through the one-way valve 11, at the moment, no liquid medium exists in the hydraulic resistance retarder pump 1, the hydraulic resistance state does not exist, and the automobile normally or stops running.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.