CN203626971U

CN203626971U - Exhaust butterfly valve for auxiliary braking of automobile

Info

Publication number: CN203626971U
Application number: CN201320773442.0U
Authority: CN
Inventors: 张兴海
Original assignee: Chongqing Branch of DFSK Motor Co Ltd
Current assignee: Chongqing Branch of DFSK Motor Co Ltd
Priority date: 2013-11-29
Filing date: 2013-11-29
Publication date: 2014-06-04
Anticipated expiration: 2023-11-29

Abstract

The utility model discloses an exhaust butterfly valve for auxiliary braking of an automobile. The exhaust butterfly valve comprises a valve body, a valve rod, a valve plate and a power mechanism, wherein the valve plate is fixed in an inner cavity of the valve body through the valve rod and is connected with the power mechanism; the power mechanism drives the valve plate to overturn in the inner cavity by taking the valve rod as a rotating shaft; when the valve plate is closed, the inner cavity is separated into an air inlet cavity and an exhaust cavity, the valve plate is symmetrical bilaterally and longitudinally, and the axis of the valve rod is deviated from the bilateral symmetry axis of the valve plate, so that one side of the valve plate, facing the air inlet cavity is divided into a compression face I and a compression face II which have different areas by a longitudinal plane passing the axis. According to the exhaust butterfly valve, the valve plate and the valve rod are eccentrically arranged, so that one side of the valve plate, facing the air inlet cavity is divided into the compression face I and the compression face II which have different areas, the reset force for relieving exhaust brake by the exhaust butterfly valve is increased by the pressure difference between the two compression faces, the operating torque is decreased when the valve plate is open, the energy consumption of an engine is reduced, the valve plate opening flexibility is ensured, and the exhaust braking function of the engine is normal.

Description

Car auxiliary brake exhaust butterfly valve

Technical field

The utility model relates to a kind of car auxiliary brake parts, particularly a kind of car auxiliary brake exhaust butterfly valve.

Background technique

Along with commercial car increases the requirement of braking system, only rely on the user demand that can not meet client to traditional braking system upgrading completely, the auxiliary braking so arisen at the historic moment, although auxiliary braking does not reach the so large braking force of primary brake system output, but car load utilizes auxiliary braking both to reduce the wearing and tearing of friction plate while needing to slow down in the process of moving, can also play the effect of braking deceleration.Exhaust brake is a kind of retarding braking of auxiliary driving braking action, and its simple in structure, low price, is widely used on diesel-powered truck or passenger vehicle.Exhaust and brake system is normally installed an exhaust brake butterfly valve at engine exhaust pipe place, in the time that exhaust brake is inoperative, valve block opens, outlet pipe conducting, does not affect the normal work of motor, in the time that exhaust brake works, the cylinder of exhaust butterfly valve is accepted the energy from motor, piston in cylinder promotes valve rod and rotates, thereby valve block is closed, outlet pipe stops up, the fuel feeding of the mandatory cut-out motor of oil-break mechanism simultaneously, the automobile travelling drives engine crankshaft rotation, engine piston is in exhaust stroke, the gas of discharging is closed compressed because braking valve block, produce pressure, motor is worked as gas compressor, when compressed gas makes exhaust, piston stroking upward produces resistance, strengthen the loss of calming the anger of motor, thereby play braking effect.

Existing exhaust brake butterfly valve, comprise valve body, valve rod, valve block and power mechanism, valve block is fixed on by valve rod in the inner chamber of valve body, valve block is connected with power mechanism, power mechanism band moving valve plate overturns in described inner chamber take valve rod as rotating shaft, valve block is left and right, upper and lower symmetry shape, and when valve block is closed, inner chamber is separated into air-inlet cavity and exhaust cavity, the symmetrical axle of the axis of valve rod and valve block, on same longitudinal plane, makes, by the longitudinal plane of axis, valve block is separated into two compression faces that area equates towards the one side of air-inlet cavity.In the time removing exhaust brake, can valve block reset flexibly, is swimmingly to guarantee the very important factor of travel safety.Generally, valve block can reset under the return spring effect of power mechanism, but return spring occurs hair fastener phenomenon after long between can be in use because of himself character and Environmental Conditions, and causing resetting has some setbacks, and even resets unsuccessfully; And be limited by the elastic force limit of return spring, be difficult to increase reposition force by unilaterally increasing spring force.

Therefore, be necessary existing exhaust butterfly valve to improve the reposition force while increasing its releasing exhaust brake, operation moment of torsion while opening to reduce valve block, the energy loss that reduces motor, guarantees the flexibility ratio that valve block opens, and guarantees the normal operation of engine exhaust and brake function.

Model utility content

In view of this, the purpose of this utility model is to provide a kind of car auxiliary brake exhaust butterfly valve, reposition force while increasing its releasing exhaust brake, operation moment of torsion while opening to reduce valve block, reduce the energy loss of motor, guarantee the flexibility ratio that valve block opens, guarantee the normal operation of engine exhaust and brake function.

Car auxiliary brake of the present utility model exhaust butterfly valve, comprise valve body, valve rod, valve block and power mechanism, described valve block is fixed on by described valve rod in the inner chamber of described valve body, described valve block is connected with described power mechanism, described power mechanism drives described valve block to overturn in described inner chamber take described valve rod as rotating shaft, when described valve block is closed, described inner chamber is separated into air-inlet cavity and exhaust cavity, described valve block left and right, upper and lower symmetrical, the symmetrical axle of valve block described in the axis runout of described valve rod, make, by the longitudinal plane of described axis, described valve block is separated into compression face I and the compression face II that area does not wait towards the one side of described air-inlet cavity.

Further, described valve rod and valve block are fixed and transmission by link, and described link departs from the axis setting of described valve rod, and are partial to the link quantity of described compression face I one side more than the link quantity of described compression face II one side of deflection.

Further, be fixed with for forming with the chamber wall of described inner chamber the seal ring being tightly connected on described valve block, the sealing surface between described seal ring and described inner chamber chamber wall is staggered by the hollow part on described seal ring.

Further, the surface, outer ring of described seal ring forms described hollow part in the mode of part indent.

Further, the outer ring centre of surface indent of described seal ring, the longitudinal section of described outer ring is " U " shape, the both sides of described hollow part are sealed department, and described hollow part equates with the horizontal width of described sealed department.

Further, described valve block is stepped ringwise towards a side of described air-inlet cavity, and the trim ring that described seal ring is set in higher level's ladder and is set in subordinate's ladder presses.

Further, the bottom of described valve body is provided with pressure limiting road, is provided with the pressure limiting device of being partial to the pressure of described air-inlet cavity one side for reducing engine exhaust pipeline in described pressure limiting road.

Further, described pressure limiting device is piston type pressure-limit valve, and the bottom of described valve body is also provided with the pore being communicated with described pressure limiting road, and described pore comprises that air inlet pore and opening that opening is positioned at described air-inlet cavity one side are positioned at described exhaust cavity one side exhaust pore.

Further, the opening of described air inlet pore and exhaust pore is all located at the chamber wall of described inner chamber, and described air inlet pore and exhaust pore are the inclination pore of the described valve rod axis of deflection.

Further, the angle that described air inlet pore is partial to described valve rod axis with exhaust pore is identical.

The beneficial effects of the utility model: car auxiliary brake of the present utility model exhaust butterfly valve, valve block and valve rod are eccentric to be installed, make valve block be separated into towards the one side of air-inlet cavity compression face I and the compression face II that area does not wait, pressure reduction between two compression faces has increased reposition force when exhaust butterfly valve is removed exhaust brake, operation moment of torsion while opening to reduce valve block, the energy loss that reduces motor, guarantees the flexibility ratio that valve block opens, and guarantees the normal operation of engine exhaust and brake function; The utility model is simple in structure, easy to use, has highly application value.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the utility model is further described:

Fig. 1 is structural representation of the present utility model;

Fig. 2 is that H in Fig. 1 is to view;

Fig. 3 is the enlarged view at A place in Fig. 1;

Fig. 4 is the enlarged view at B place in Fig. 1.

Embodiment

Fig. 1 is structural representation of the present utility model, Fig. 2 is that H in Fig. 1 is to view, Fig. 3 is the enlarged view at A place in Fig. 1, Fig. 4 is the enlarged view at B place in Fig. 1, as shown in the figure: the car auxiliary brake of the present embodiment exhaust butterfly valve, comprise valve body 1, valve rod 2, valve block 3 and power mechanism 4, when described valve block 3 is closed, described inner chamber is separated into air-inlet cavity 51 and exhaust cavity 52, described valve block 3 is connected with described power mechanism 4, described power mechanism 4 drives described valve block 3 to overturn in described inner chamber take described valve rod 2 as rotating shaft, when described valve block 3 is closed, described inner chamber is separated into air-inlet cavity 51 and exhaust cavity 52, described valve block 3 left and right, upper and lower symmetrical, the axis 2a of described valve rod 2 departs from the symmetrical axle 3a of described valve block 3, make, by the longitudinal plane of described axis 2a, described valve block 3 is separated into compression face I 31 and the compression face II 32 that area does not wait towards the one side of described air-inlet cavity 51, this exhaust butterfly valve is installed in engine exhaust pipe outlet, valve body 1 and valve block 3 all adopt resistant to elevated temperatures ductile cast iron material manufacture to form, and its reliability is high, power mechanism 4 is cylinder or vacuum servo cylinder, the piston rod that is provided with piston in it and moves with ovable valve stem 2, under normal vehicle operation state, the waste gas streams of motor is discharged after exhaust butterfly valve, in the time that needs are braked, the control system control power mechanism 4 of vehicle moves, power mechanism 4 is with overturn certain angle valve block 3 valve body 1 inner chamber chamber walls are formed be tightly connected of moving valve plate 3, inner chamber is divided into air-inlet cavity 51 and the exhaust cavity 52 of sealing, the waste gas that motor is discharged is intercepted in air-inlet cavity 51, forms engine exhaust and brake, when resetting, valve block 3 mainly relies on the elastic force of Returnning spring 41, valve block 3 has symmetrical axle 3a and upper and lower symmetry axis 3b, and certainly, the spatially actual face symmetric relation that is of valve block 3 just simply represents with symmetry axis herein, the axis 2a of valve rod 2 departs from the symmetrical axle 3a of valve block 3, refers to that axis 2a is not on the longitudinal plane of symmetrical axle 3a, and axis 2a is not or not valve block 3 middle parts, the valve block 3 of this enforcement is disc towards the one side of air-inlet cavity 51 in the time closing, the longitudinal midline of disc is symmetrical axle 3a, this disc is separated into compression face I 31 and compression face II 32 by an imaginary longitudinal plane by axis 2a, and the area of compression face I 31 is greater than compression face II 32, in the time that this exhaust butterfly valve is removed exhaust brake, coordinate the effect of Returnning spring 41, compression face I 31 is moved to exhaust cavity 52 along reverses direction, compression face II 32 is moved to air-inlet cavity 51 along reverses direction, pressure reduction between two compression faces has increased reposition force when this exhaust butterfly valve is removed exhaust brake, has reduced operation moment of torsion when valve block 3 opens, and reduces the energy loss of motor, guarantee the flexibility ratio that valve block 3 opens, guarantee the normal operation of engine exhaust and brake function.

In the present embodiment, described valve rod 2 and valve block 3 fixing and transmission by link 23, the axis 2a that described link 23 departs from described valve rod 2 arranges, and is partial to link 23 quantity of described compression face I 31 1 sides more than link 23 quantity of described compression face II 32 1 sides of deflection; In valve block 3, be provided with the bar hole of passing for valve rod 2, the relevant position of bar hole and valve rod 2 is provided with the attachment hole connecting for link 23; Link 23 can use bolt, also can use locating stud etc. to play part fixing, gearing; The axis 2a that attachment hole departs from valve rod 2 arranges, and attachment hole is not or not the middle part of valve rod 2; The distributed number of link 23 adapts to the force-bearing situation of compression face, reduces the fatigue wear of valve rod 2 and valve block 3 joints, strengthens join strength; As shown in Figure 2, the link 23 that is located at deflection compression face I 31 1 sides forms triangle joint structure with the link 23 that is located at deflection compression face II 32 1 sides, makes to connect more firm.

In the present embodiment, be fixed with for forming with the chamber wall of described inner chamber the seal ring 6 being tightly connected on described valve block 3, the sealing surface between described seal ring 6 and described inner chamber chamber wall is staggered by the hollow part 61 on described seal ring 6; Seal ring 6 ring sets dock to form sealing outside valve block 3 and with inner chamber chamber wall phase shape adaptation; By the hollow part 61 not contacting with the chamber wall of inner chamber is set on seal ring 6, make the sealing surface setting of staggering, guaranteeing that seal ring 6 has the area of contact that reduces itself and inner chamber under the prerequisite of enough width, make seal ring 6 be easy to extrusion-deformation, operation moment of torsion while keying to reduce valve block 3, reduce the energy loss of motor, guarantee 3 flexibility ratios of closing of valve block, guarantee the normal operation of engine exhaust and brake function; Certainly, seal ring 6 also can directly not contact with the chamber wall of inner chamber, can be provided with to be specifically designed to seal ring 6 to form the stuffing box gland being tightly connected on the wall of chamber.

In the present embodiment, the surface, outer ring of described seal ring 6 forms described hollow part 61 in the mode of part indent; Directly form hollow part 61 from the outer ring concave surface of seal ring 6, be conducive to simplified processing process and keep seal ring 6 intensity; Seal ring 6 is " O " type and is metal o-ring; Hollow part 6 can arrange one, also can arrange multiplely, and its shape does not also limit, as long as can realize the function at sealing surface interval; Part indent, it is with inner chamber chamber wall and seals the sealed department 62 contacting with the part of indent not; As for ratio and the distribution of female parts, need to take into account good sealing effect; Hollow part 61 does not contact with inner chamber chamber wall, but the sealed department 62 of just allowing side is squeezed, Shi Xiangqi distortion, makes seal ring 6 be easy to extrusion-deformation.

In the present embodiment, the outer ring centre of surface indent of described seal ring 6, the longitudinal section of described outer ring is " U " shape, the both sides of described hollow part 61 are sealed department 62, and described hollow part 61 equates with the horizontal width of described sealed department 62; Seal ring 6 surfaces, outer ring are a part for an external conical surface on space, have certain inclination, make the sealing surface of sealed department 62 in the plane of same inclination, are conducive to form be tightly connected; Hollow part 6 is positioned at center, outer ring, and its degree of depth is the half of outer ring width; Hollow part 61 equates with the horizontal width of sealed department 62, is 1/3rd of outer ring width, is convenient to the uniformity that the processing while maintains seal ring 6 to greatest extent.

In the present embodiment, described valve block 3 is stepped ringwise towards a side of described air-inlet cavity 51, and the trim ring 7 that described seal ring 5 is set in higher level's ladder 31 and is set in subordinate's ladder 32 presses; Seal ring 6 is sleeved on higher level's ladder 31, and trim ring 7 is sleeved on subordinate's ladder 32 and contacts with seal ring 6 forming surfaces, and hold-down bolt is fixed on trim ring 7 and seal ring 6 by the fixed hole on trim ring 7 and valve block 3 outer edge of valve block 3; For further Leakage prevention, before being sleeved on higher level's ladder 31, seal ring 6 also must be set with one deck pad; The integral width of seal ring 6 is slightly larger than the bottom width of higher level's ladder 31, and in the process of tightening gradually hold-down bolt, trim ring 7 can produce laterally extruding to seal ring 6 and make its generation resiliently deformable, produces pretightening force.

In the present embodiment, the bottom of described valve body 1 is provided with pressure limiting road 8, is provided with the pressure limiting device of being partial to the pressure of described air-inlet cavity 51 1 sides for reducing engine exhaust pipeline in described pressure limiting road 8; Exhaust brake is to rely on the back pressure producing in air-inlet cavity 51 to realize, because the rotating speed of motor changes within the specific limits, so back pressure is also in constantly changing, along with the raising of engine speed, back pressure is also increasing, and the force value that exceeds motor license will work the mischief to motor itself; Pressure limiting road 8 can be the duct that valve body 1 bottom one is communicated with outlet pipe, has pressure limiting device in it, can in the time that back pressure reaches limit value, make outlet pipe 52 be communicated with, and makes waste gas obtain discharge to regulate pressure, guarantees the Security of exhaust brake; The size in pressure limiting road 8 adapts to structure with the shell shape size of valve body 1.

In the present embodiment, described pressure limiting device is piston type pressure-limit valve 9, the bottom of described valve body 1 is also provided with the pore being communicated with described pressure limiting road 8, and described pore comprises that air inlet pore 81 and opening that opening is positioned at described air-inlet cavity 51 1 sides are positioned at described exhaust cavity 52 1 side exhaust pores 82; Pressure limiting road 8 only has an end opening, and opening is towards exhaust cavity 52, and this opening is sealed by spring seat; Piston type pressure-limit valve 9 comprises the piston, spring, the spring seat that connect successively, and its structure is same as the prior art, does not repeat them here; 8 two ends, pressure limiting road are tightly connected with air inlet pore 81, exhaust pore 82 respectively, and air-inlet cavity 51, exhaust cavity 52 are communicated with by pressure-limit valve 9; It is simple in structure, can reach good pressure release effect.

In the present embodiment, the opening of described air inlet pore 81 and exhaust pore 82 is all located at the chamber wall of described inner chamber, and described air inlet pore 81 and exhaust pore 82 are the inclination pore of described valve rod 2 axis of deflection; Pore is designed to pore, makes the diameter of axle size in pressure limiting road 8 less, even if machining is poor wayward, valve body 1 also can be guaranteed in the intensity of this part, and saved and manufactured the required raw material of valve body 1, alleviate the weight of valve body 1 to reduce automobile energy consumption, make its motion more smooth; Meanwhile, for straight hole and the inclined hole of same front and back end points, same diameter, the latter's gas transmission path is longer, can guarantee the smooth and easy work of pressure limiting device.

In the present embodiment, described air inlet pore 81 is identical with the angle that exhaust pore 72 is partial to described valve rod 2 axis; Same angle of inclination pore both facilitated batch process, also can maintain to greatest extent the degree of balance on valve body 1 both sides.

Finally explanation is, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.

Claims

1. a car auxiliary brake exhaust butterfly valve, comprise valve body, valve rod, valve block and power mechanism, described valve block is fixed on by described valve rod in the inner chamber of described valve body, described valve block is connected with described power mechanism, described power mechanism drives described valve block to overturn in described inner chamber take described valve rod as rotating shaft, when described valve block is closed, described inner chamber is separated into air-inlet cavity and exhaust cavity, described valve block left and right, upper and lower symmetrical, it is characterized in that: the symmetrical axle of valve block described in the axis runout of described valve rod, make, by the longitudinal plane of described axis, described valve block is separated into compression face I and the compression face II that area does not wait towards the one side of described air-inlet cavity.

2. car auxiliary brake according to claim 1 exhaust butterfly valve, it is characterized in that: described valve rod and valve block are fixed and transmission by link, described link departs from the axis setting of described valve rod, and is partial to the link quantity of described compression face I one side more than the link quantity of described compression face II one side of deflection.

3. car auxiliary brake according to claim 2 exhaust butterfly valve, it is characterized in that: it is characterized in that: on described valve block, be fixed with for forming with the chamber wall of described inner chamber the seal ring being tightly connected, the sealing surface between described seal ring and described inner chamber chamber wall is staggered by the hollow part on described seal ring.

4. car auxiliary brake according to claim 3 exhaust butterfly valve, is characterized in that: the surface, outer ring of described seal ring forms described hollow part in the mode of part indent.

5. car auxiliary brake according to claim 4 exhaust butterfly valve, it is characterized in that: the outer ring centre of surface indent of described seal ring, the longitudinal section of described outer ring is " U " shape, the both sides of described hollow part are sealed department, and described hollow part equates with the horizontal width of described sealed department.

6. car auxiliary brake according to claim 5 exhaust butterfly valve, is characterized in that: described valve block is stepped ringwise towards a side of described air-inlet cavity, and the trim ring that described seal ring is set in higher level's ladder and is set in subordinate's ladder presses.

7. according to the exhaust butterfly valve of the car auxiliary brake described in any one in claim 1 to 6, it is characterized in that: the bottom of described valve body is provided with pressure limiting road, in described pressure limiting road, be provided with the pressure limiting device of being partial to the pressure of described air-inlet cavity one side for reducing engine exhaust pipeline.

8. car auxiliary brake according to claim 7 exhaust butterfly valve, it is characterized in that: described pressure limiting device is piston type pressure-limit valve, the bottom of described valve body is also provided with the pore being communicated with described pressure limiting road, and described pore comprises that air inlet pore and opening that opening is positioned at described air-inlet cavity one side are positioned at described exhaust cavity one side exhaust pore.

9. car auxiliary brake according to claim 8 exhaust butterfly valve, it is characterized in that: the opening of described air inlet pore and exhaust pore is all located at the chamber wall of described inner chamber, and described air inlet pore and exhaust pore are the inclination pore of the described valve rod axis of deflection.

10. car auxiliary brake according to claim 9 exhaust butterfly valve, is characterized in that: the angle that described air inlet pore is partial to described valve rod axis with exhaust pore is identical.