CN101251048A - Exhaust brake - Google Patents

Abstract

The invention relates to an exhaust brake with a decompressor and a method for preventing the formation of the overpressure in the exhaust brake. The operating pressure of the exhaust brake is reliable and adjustable. The exhaust brake comprises a valve body, a disc, a supporting rod, a supporting sleeve, a reducing valve, a spring and an adjustable bolt and does not have a pressure relief vent, wherein, the supporting rod and the supporting sleeve are used for fixing the disc, the reducing valve is used for stably activating the exhaust resistance, the spring is used for adjusting the size of the operating back pressure of an assembly. The exhaust brake with the decompressor can release the excess pressure in time when the pressure surpasses the presetting value due to any unforeseen circumstances and guarantees the stable and reliable operating pressure; moreover, the exhaust brake with the decompressor has adjustable operating pressure, simple and convenient implementation and reliable performance.

Description

Exhaust brake

Technical field

The present invention relates to a kind of exhaust brake that has decompressor, and a kind of method that prevents from exhaust brake, to form overvoltage.Make the working pressure of exhaust brake reliable and stable, and can regulate.

Technical background

Auto brake system is one of important device of Hyundai Motor high speed, safety traffic.When vehicle need slow down particularly in the mountain area or city bus when needing frequent braking, if frequently use service brake, will cause wheel drag overheated and make braking ability decline, as untimely taking emergency measures (cooling of stopping), even can cause braking total failure and the vehicle condition of causing danger.So adopt nothing decline property auxiliary braking system to be very important at this type of situation.Use complemental brake system can strengthen the vehicle braked performance, need not use or use less foundation brakes (traditional friction brake) just vehicle can be controlled in certain safety speed scope, the prevention car brakeing is malfunctioning, guarantee traffic safety, the Security when particularly strengthening the heavy-duty vehicle lower long slope.Use retarder can reduce the frequency of utilization of main Service Brake (friction brake) significantly simultaneously, thereby reduce the wearing and tearing of foundation brakes braking hub and friction plate, improve its working life, prolong the service cycle of foundation brakes simultaneously, reduce maintenance cost, improve the Security and the travelling comfort of driving, reduce driver's fatigue, increase work efficiency.

In the auxiliary brake device for automobile that uses at present, exhaust brake is simple in structure because of it, reliable performance, and operation is easy for installation easily, and he has obtained using widely as a kind of complemental brake system.Exhaust brake is that a dishful of valve and rotating mechanism are installed in the engine exhaust pipeline, increases the exhaust stroke resistance by closing this dish valve, and the exhaust that utilizes motor is as auxiliary braking.Yet the engine exhaust pipeline normally according to exhaust gas temperature, air pressure with and back pressure design, consider when adopting exhaust braking and do not arrange

Air pipe is closed and the abnormal conditions of the excessive increase of build-up of pressure fully, and this situation is in case take place and will exhaust braking be caused damage; On the other hand, owing to there is not controlling device, braking force is not steady state value just, but increases with the rotating speed of motor, will cause damage to motor in case pressure surpasses the numerical value of motor permission.Though can reduce its pressure maximum by increasing pressure relief vent, also increased virtually and produced the time of back pressure, braking is serious to lag behind so can cause equally, and same force value is also unstable.In addition because the serious hysteresis of braking so often make it lose braking effect, also can cause accident to take place when serious.

Summary of the invention

Unstable and non-adjustable at the back pressure that existing exhaust brake exists, the serious shortcoming that lags behind of braking the object of the present invention is to provide a kind ofly can in time discharge excess pressure, keeps the braking working pressure stable, and the sensitive exhaust brake of braking reflection.

For achieving the above object, the present invention adopts following technological scheme:

Exhaust brake comprises valve body, video disc, strut, supporting sleeve, reduction valve, spring and adjusting screw, has cancelled pressure relief vent.Strut and supporting sleeve are used for fixing video disc, and reduction valve is used for stable size of starting exhaust resistance, spring to be used for regulating the Operating back pressure of assembly.

Adopt the exhaust brake of structure of the present invention can accurately control the working pressure size of assembly, and reflect sensitivity, braking is steadily reliable.

Description of drawings:

Fig. 1: existing exhaust brake structural representation;

Fig. 2: the braking curve of existing exhaust brake;

Fig. 3: exhaust brake structural representation of the present invention (exhaust steam passage is in off state);

Fig. 4: exhaust brake structural representation of the present invention (exhaust steam passage is in opening state);

Fig. 5: the present invention second implements structural representation (exhaust steam passage is in off state);

Fig. 6: the present invention second implements structural representation (exhaust steam passage is in opening state);

Fig. 7: the braking curve of exhaust brake of the present invention.

The present invention will be further described below in conjunction with accompanying drawing.

Structural principle for a more clear understanding of the present invention illustrates novelty of the present invention, creativeness, and Compare with other disclosed slowing down speed of engine structures, earlier Fig. 1 is analyzed.

Structure shown in Figure 1 is the structural representation of existing exhaust brake, and support bar 03 is fixed on video disc 02 The assigned address of valve body 01. The direction of arrow is the flow direction of waste gas. 11 for video disc is in open mode, and 12 For video disc is in closed condition. Driving video disc 02 by support bar 03 during exhaust brake work turns to around its axle center Moving, make video disc turn to 12 positions by 11 positions, thereby close blast pipe, along with increasing of waste gas, chamber Pressure in 21 increases thereupon, thereby hinders engine running, and then implements braking, simultaneously in order to prevent the chamber The excessive infringement engine of pressure in 21 increases by a pressure relief vent 04 in the appropriate location of video disc 02. Need to separate During except braking, drive video disc 02 by support bar 03 and turn to 11 positions by 12 positions, thereby open exhaust Pipe, waste gas can flow to chamber 22 by chamber 21, and engine is in normal acting pattern.

As seen from Figure 1, the pressure when being in on-position in the chamber 21 is not invariable, but with Waste gas in the chamber 21 and increase and progressively increase, simultaneously because the existence of pressure relief vent 04, the pressure in the chamber 21 Power can instantaneous increase predetermined numerical value.

Fig. 2 is the braking curve of the exhaust brake of figure one structure, can see exhaust brake from the curve Brake force is not constant numerical value along with the variation of rotating speed changes. In case brake force surpasses engine The scope of permitting will cause serious infringement to engine.

For this reason, purpose of the present invention is exactly to solve existing the problems referred to above, can be summarized as follows:

1, want accurately to control the engine exhaust resistance, in time discharge excess pressure, and this adjustable in pressure;

2, the braking reflection time will lack, and reliable.

Embodiment

Introduce the specific embodiment of the present invention below in conjunction with Fig. 3, Fig. 4.Fig. 3 is in off state for exhaust steam passage, and Fig. 4 is in open mode for exhaust steam passage.All all use identical numbering with parts that the front has identical function among Fig. 3 and Fig. 4.

The component that valve body 01 is used for finishing braking function consist of an assembly, and strut 03 and supporting sleeve 14 are used for video disc 02 is fixed on the specified position of valve body 01, and the direction of arrow is represented the flow direction of waste gas.Have above the video disc 02 chamber 21 and chamber 22, one reduction valve 05 by spring 06, pressing plate 07, regulate and support 09 and cover 08 bottom that is pressed in chamber 22, at this moment, reduction valve 05 is divided into two-part to chamber 22 and chamber 32; In the time of need not braking, video disc 02 is in 11 positions, and motor is in normal acting pattern.When needs are braked, strut 03 drive video disc 02 around its axis by 11 rotated position to 12 positions, thereby close exhaust duct, along with the running of motor, its exhaust resistance is increasing, pressure in the corresponding chamber 21 is also increasing, because chamber 21 and chamber 32 is communicated with, thus the pressure in the chamber 32 also increase thereupon, when the pressure in the chamber 32 increases to when being enough to overcome the active force of spring 06, will promote reduction valve 05 and move downward, away from valve seat; Pressurized gas in the chamber 32 chamber 22 of just flowing through, chamber 23 flows in the gas exhaust piping, pressure in the chamber 32 reduces because of the discharge of waste gas simultaneously, when the gas pressure in the chamber 32 is not enough to overcome the active force of spring 06, reduction valve will move up, up to the bottom that is pressed in chamber 32 again, and chamber 32 and chamber 22 are kept apart again.Pressure in this back cavity 32 can continue again to raise, and then repeats said process, and when the needs brake off, strut 03 drives video disc 02 and rotates, and to 11 positions, open the exhaust passage by 12 rotated position, and motor enters normal acting pattern.Learn from the above mentioned,, do not change with change in rotational speed because the effect of reduction valve can make the pressure in the chamber 21 remain in certain scope; Simultaneously owing to removed pressure relief vent, but make the pressure moment in the chamber 21 rise to predetermined value, make and brake more flexibility and reliability.

Fig. 5 and Fig. 6 are a kind of distressed structures of the present invention, adopt the independently mechanism of decompressor, video disc section 02 strut 03 and strut 13 are fixed on the specified position of valve body 01, and video disc 02 can rotate with strut 03, one independently the mechanism of decompressor be installed on the valve body 01, reduction valve 05 is supported 09 by pressing plate 14, spring 06, pressing plate 07 and adjusting and is fixed on the valve seat of 21 bottoms, chamber, chamber 22 communicates by chamber 23 and gas exhaust piping, initial position reduction valve 05 is divided into two-part to chamber 21 and chamber 22, this independently the mechanism of decompressor can be installed on the position of valve body any appropriate.

Fig. 7 is the braking curve of the exhaust brake of structure of the present invention, from plotted curve, can see that braking curve at the beginning is steep especially, become a horizontal line then soon, the braking force of expression exhaust brake can reach predetermined braking force soon being to increase rapidly with the increase of speed at first.Braking force will keep a constant value subsequently, and no longer the variation with speed changes, so brake percentage is more steady.

By above-mentioned description to structural principle of the present invention, as can be seen, structure of the present invention can accurately be controlled the engine exhaust resistance, and this adjustable in pressure; The braking reflection time will lack, and sensitive reliable.The present invention is simple in structure in addition, and it is convenient to implement, and manufacture cost is lower, is easy to realize.And apparatus of the present invention are when being in closed condition, and motor can keep the pattern of doing work normally, is not subjected to the influence of exhaust brake.Last structure of the present invention, only need reserve the position that connects exhaust brake in place and get final product without any need for change motor.

Claims (9)

1. an exhaust brake comprises valve body, video disc, strut, reduction valve, spring and adjusting screw, has cancelled pressure relief vent.Strut is used for fixing video disc, and reduction valve is used for discharging excessive pressure, and is stable to keep working pressure, and spring is used for regulating the size of the working pressure of assembly.

2. exhaust brake according to claim 1 is characterized in that having increased a reduction valve 05 and is used for stable operation pressure;

3. exhaust brake according to claim 1 is characterized in that having increased by one and regulates support 10, and working pressure is adjustable;

4. exhaust brake according to claim 1 is characterized in that reduction valve can be placed on the place of any needs;

5. exhaust brake according to claim 1 is characterized in that reduction valve and break valve body are separate;

6. exhaust brake according to claim 5 is characterized in that reduction valve can typically use a steel ball;

7. exhaust brake according to claim 5 is characterized in that having increased significantly between reduction valve and the spring ball-type pad;

8. exhaust brake according to claim 5 is characterized in that chamber 21 is communicated with gas exhaust piping by chamber 22, chamber 23;

9. exhaust brake according to claim 1, it is characterized in that covering 08 can regularly remove conveniently to safeguard.

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