CN107891853B

CN107891853B - Double-working-condition stepless transformation ratio vacuum booster

Info

Publication number: CN107891853B
Application number: CN201711127741.6A
Authority: CN
Inventors: 尹钢
Original assignee: Chongqing Fengdu Sanhe Industry Co ltd
Current assignee: Chongqing Fengdu Sanhe Industry Co ltd
Filing date: 2017-11-15
Publication date: 2024-07-09
Anticipated expiration: 2037-11-15

Abstract

The invention relates to the technical field of vacuum boosters, in particular to a double-station stepless transformation ratio vacuum booster which comprises a shell (1), a movable valve body (2) and a separation piece (3), wherein a push rod (4), a feedback disc assembly and a push rod (5) are sequentially arranged in the movable valve body (2), an airtight valve cap assembly is sleeved on the push rod (4), the airtight valve cap assembly comprises an airtight valve cap (14), a blocking piece (16) is arranged in the movable valve body (2), and in an initial state, the airtight valve cap is separated from the blocking piece by a distance L. The vacuum booster can realize half-way boosting.

Description

Double-working-condition stepless transformation ratio vacuum booster

Technical Field

The invention relates to the technical field of vacuum boosters, in particular to a double-station stepless transformation ratio vacuum booster.

Background

The vacuum booster of the prior art generally has only one working condition, namely, the vacuum booster is boosted in the whole process, namely, the clutch control section is boosted, and the brake is boosted in the braking process, while the prior art also has a requirement that the clutch control section is not boosted, and the brake is boosted in the braking process, namely, the half-process boosting is performed, but the vacuum booster does not have the function in the prior art.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the double-working-condition stepless transformation ratio vacuum booster can realize half-way booster.

The technical scheme adopted by the invention is as follows: the utility model provides a dual condition stepless transformation ratio vacuum booster, it includes the casing, the movable valve body that sets up in the casing, set up the spacer that is used for dividing the cavity between casing and the movable valve body into two cavitys between casing and the movable valve body, be equipped with the push rod in proper order in the movable valve body, feedback disk subassembly and ejector pin, two cavitys are first cavity and second cavity respectively, be equipped with the first involucra that is used for dividing first cavity into first vacuum cavity and first air cavity in the first cavity, be equipped with the second involucra that is used for dividing second cavity into second vacuum cavity and second air cavity in the second cavity, the cover is equipped with airtight bonnet subassembly on the push rod, airtight bonnet subassembly includes the spring holder that the cover is established on the push rod, one end offsets with the spring subassembly and the airtight bonnet that offsets with the other end of spring subassembly, airtight bonnet upper end and movable valve body contact and seal, the airtight bonnet lower extreme is equipped with the air valve contact and the sealed membrane of push rod, be equipped with in the movable valve body and be used for blocking airtight subassembly and then make first air cavity and second air cavity switch on with the first involucra and the second air cavity, be equipped with the airtight bonnet that is used for separating the second air cavity and the lower extreme and air supply ring contact with the air inlet ring and the lower part of second air inlet ring and air inlet valve contact with the second air cavity and outer valve,

And in the initial state, the airtight valve cap is separated from the barrier by a distance L.

Compared with the prior art, the invention has the following advantages: the airtight valve cap assembly and the blocking piece are adopted, the distance L is reserved between the airtight valve cap and the blocking piece in an initial state, so that no action relation exists between the airtight valve cap and the blocking piece when the push rod moves, namely, the vacuum booster does not boost the force at the moment, and the booster is started only after the push rod continues to move to push the airtight valve cap to be in contact with the first contact ring on the blocking piece, so that the half-range booster function is achieved.

Preferably, the middle part of the airtight valve cap is further provided with a vacuum valve film, and the blocking piece is further provided with a second contact ring which is used for propping against the vacuum valve film and further preventing gas entering from the lower end of the airtight valve cap from entering the first vacuum cavity and the second vacuum cavity along the airtight valve cap. The second contact ring is arranged, so that external gas can be effectively prevented from entering the vacuum cavity.

Preferably, the second contact ring and the blocking member are arranged separately, and a driving spring is arranged between the second contact ring and the blocking member. The impact force to the vacuum valve membrane is small in the contact process, and the vacuum valve membrane is not easy to damage.

Preferably, the airtight valve cap comprises a cap body, a first framework arranged on the outer circumference of the cap body, a second framework arranged in the inner circumference of the cap body and a closing-in coil spring arranged on the inner circumference of the cap body, wherein one end of the first framework is contacted with one end of the second framework and can rotate. By means of the arrangement, the airtight valve cap can be conveniently rotated to be opened after being contacted with the first contact ring, and the airtight valve cap and the first contact ring cannot be damaged due to collision.

A filtering ring and a silencing ring are arranged between the push rod and the movable valve body, and the filtering ring and the silencing ring are made of elastically deformable materials. Therefore, the air cavity can be reliably prevented from leaking under the condition that the push rod can swing a certain angle slightly relative to the ball body.

Preferably, the feedback disc assembly comprises a feedback disc, a pressure input plug, a feedback receiving disc, a reset mechanism and a sealing sleeve, wherein one end of the pressure input plug is propped against the middle of the feedback disc, the other end of the pressure input plug is propped against the push rod, the feedback receiving disc is sleeved outside the pressure input plug and propped against the edge of the feedback disc, the reset mechanism is arranged outside the feedback disc and used for helping the feedback disc to reset quickly, the sealing sleeve is used for sleeving the feedback disc, the reset mechanism and the feedback receiving disc, and one end of the feedback disc, which is contacted with the pressure input plug, is spherical. The setting like this adopts the feedback dish of sphere to be more by extrusion deformation, sets up a canceling release mechanical system moreover, can reset fast under the condition that does not have push rod pressure.

Preferably, the whole feedback disc is triangular, and the contact part of the feedback disc and the pressure input plug is an inward concave cambered surface matched with the pressure input plug. The triangular structure is arranged, so that the contact part of the input plug and the pressed input plug can be conveniently changed into a round shape after being pressed by force, the feedback effect is good, and the contact part of the input plug and the pressed input plug is arranged into a concave cambered surface, so that the input plug and the pressed input plug can be matched better.

Preferably, the reset mechanism is at least one of a honeycomb screen or an elastic band. The elastic hoop is simple in structure, and the reset effect is good when the elastic hoop is arranged as a honeycomb screen.

Preferably, the push rod is also provided with a rapid air inlet channel for external air to enter the air inlet channel rapidly. Therefore, the air cavity can be quickly opened to the maximum opening state, and the maximum power assisting is provided when emergency braking is realized.

Drawings

FIG. 1 is a cross-sectional view of an initial state of a dual-condition electrodeless transformation ratio vacuum booster of the invention.

Fig. 2 is an enlarged schematic view at a in fig. 1.

Fig. 3 is an enlarged schematic view at B in fig. 1.

FIG. 4 is a cross-sectional view of the dual regime, electrodeless ratio vacuum booster airtight bonnet assembly of the present invention in contact with a barrier.

FIG. 5 is a schematic diagram of the structure of the airtight valve cap in the dual-working-condition stepless transformation ratio vacuum booster.

FIG. 6 is a schematic diagram of the structure of the feedback disc and the reset mechanism in the dual-working-condition stepless ratio-change vacuum booster of the invention.

FIG. 7 is a schematic diagram of the structure of a feedback disc in the dual-working-condition stepless transformation ratio vacuum booster of the invention.

FIG. 8 is a schematic diagram of a push rod in the dual-working-condition stepless transformation ratio vacuum booster.

As shown in the figure: 1. a housing; 2. moving the valve body; 3. a partition; 4. a push rod; 5. a push rod; 6. a first vacuum chamber; 7. a first air chamber; 8. a first coating; 9. a second vacuum chamber; 10. a second air chamber; 11. a second coating; 12. a spring seat; 13. a spring assembly; 14. an airtight valve cap; 15. an air valve membrane; 16. a blocking member; 17. a first contact ring; 18. an air intake passage; 19. a vacuum valve membrane; 20. a second contact ring; 21. a cap body; 22. a first skeleton; 23. a second skeleton; 24. closing up the coil spring; 25. a filter collar; 26. voice coil eliminating; 27. a feedback disc; 28. a pressure input plug; 29. a feedback receiving tray; 30. a reset mechanism; 31. a closing sleeve; 32. and (5) a rapid air inlet channel.

Detailed Description

The present invention will be further described with reference to the drawings and the embodiments, but the present invention is not limited to the following embodiments.

The utility model provides a double-station electrodeless transformation ratio vacuum booster, it includes casing 1, set up the removal valve body 2 in casing 1, set up and be used for dividing into the separating member 3 of two cavitys with the cavity between casing 1 and the removal valve body between 2, be equipped with push rod 4 in the removal valve body 2 in proper order, feedback disk subassembly and ejector pin 5, two cavitys are first cavity and second cavity respectively, be equipped with in the first cavity and be used for dividing into first vacuum cavity 6 and first air cavity 7's first involucra 8, be equipped with in the second cavity and be used for dividing into second vacuum cavity 9 and second air cavity 10's second involucra 11, its characterized in that: the push rod 4 is sleeved with an airtight valve cap assembly, the airtight valve cap assembly comprises a spring seat 12 sleeved on the push rod 4, a spring assembly 13 with one end propped against the spring seat 12 and an airtight valve cap 14 propped against the other end of the spring assembly 13, the upper end of the airtight valve cap 14 is contacted and sealed with the movable valve body 2, the lower end of the airtight valve cap 14 is provided with an air valve membrane 15 contacted and sealed with the push rod 4, the movable valve body 2 is internally provided with a blocking piece 16 used for blocking the airtight valve cap assembly so as to lead the first air cavity and the second air cavity to be communicated with the outside air, the blocking piece 16 is provided with a first contact ring 17 used for propping against the lower end of the airtight valve cap so as to lead the air valve membrane at the lower end of the airtight valve cap to be separated from the push rod, an air inlet channel 18 used for externally connecting air to flow into the first air cavity and the second air cavity is arranged between the lower part of the first contact ring 17 and the push rod 4,

And in the initial state, the airtight valve cap is separated from the barrier by a distance L. L is set to 20-30mm in this embodiment. If L is set to 0, the full power assist is achieved.

The middle part of the airtight valve cap 14 is also provided with a vacuum valve membrane 19, and the blocking piece 16 is also provided with a second contact ring 20 which is used for propping against the vacuum valve membrane 19 so as to prevent gas entering from the lower end of the airtight valve cap from entering the first vacuum cavity and the second vacuum cavity along the airtight valve cap.

The second contact ring 20 is disposed separately from the blocking member 16, and a driving spring is disposed between the second contact ring 20 and the blocking member 16.

The airtight bonnet 14 includes a cap body 21, a first frame 22 provided on the outer circumference of the cap body, a second frame 23 provided in the inner circumference of the cap body, and a closing-in coil spring 24 provided on the inner circumference of the cap body, the first frame 22 being in contact with one end of the second frame 23 and rotatable. The closing-in coil spring 24 is mainly arranged for ensuring the air tightness of the air inlet, so that the air valve on the air-tight valve cap and the push rod are better in air tightness.

A filtering ring 25 and a silencing ring 26 are further arranged between the push rod 4 and the movable valve body 2, the filtering ring 25 and the silencing ring 26 are made of elastically deformable materials, and then the filtering ring and the closing-in coil spring act on an air valve membrane, so that the air valve can be reliably prevented from air leakage under the condition that the push rod swings +/-3 degrees relative to the ball body.

Of course, the air valve is controlled to be opened by the axial position, so that the function of 'two working conditions' of the vacuum booster, namely the working capacity of 'half-way booster', can be better realized. And the contact ring can be reasonably and flexibly designed and opened according to the actual stroke requirement of the pedal push rod, so that the working areas of the 'booster section' and the 'non-booster section' in the whole stroke of the push rod can be planned or designed. This is an air valve and vacuum valve that are widely used at present for radial opening of vacuum boosters, which cannot be achieved or is more difficult to achieve. This can be said to be a great advantage of the vacuum booster air valve 'being axially closed and open'.

In the application, the airtight valve cap is in contact with the two contact rings at the initial state, namely a distance is reserved between the airtight valve cap assembly and the blocking piece, when the push rod starts to push, the airtight valve cap assembly is not in contact with the blocking piece at the moment, namely assistance is not started, after the push rod moves for a certain distance, the airtight valve cap assembly is in contact with the blocking piece, namely an air valve film on the airtight valve cap is in contact with a first contact ring on the blocking piece, the first contact ring pushes the air valve film open, and thus the air cavity is communicated with external air, and assistance is started. And simultaneously when the first contact ring pushes up the air valve membrane, the second contact ring can prop against the vacuum valve membrane, so that external air is prevented from entering the vacuum cavity.

The design of the transformation ratio feedback disc aims to enable the pedal load to be as consistent as possible, avoids the phenomenon that the pedal is not actuated under the normal sitting posture possibly caused by physical differences such as different ages or sexes and fatigue when the pedal force is the maximum, and simultaneously avoids the phenomenon that the pedal is soft caused by bigger assistance ratio when the required pedal force is smaller. For this purpose, a ratio feedback disc is designed to ensure that the feedback disc has the greatest assistance ratio at the maximum pedal force.

The present case is designed according to the special case of 'electrodeless transformation ratio feedback disc' which is not proposed at present. The central part is an electrodeless transformation ratio load sensing system which is used as an intermediate connecting piece of the push rod assembly, and the push rod are connected together by the sealing sleeve and the elastic clamping ring of the push rod head.

The feedback disc assembly comprises a feedback disc 27, a pressure input plug 28, a feedback receiving disc 29, a reset mechanism 30 and a sealing sleeve 31, wherein one end of the pressure input plug is propped against the middle of the feedback disc, the other end of the pressure input plug is propped against the push rod, the feedback receiving disc 29 is sleeved outside the pressure input plug and propped against the edge of the feedback disc, the reset mechanism 30 is arranged outside the feedback disc and used for helping the feedback disc to reset quickly, the sealing sleeve 31 is used for sleeving the feedback disc, the reset mechanism and the feedback receiving disc, and one end of the feedback disc 27, which is contacted with the pressure input plug 28, is a spherical surface. The feedback disc can be made of glass fiber rubber materials so as to keep high rebound ability and fatigue property. The feedback disc 27 and the feedback receiving disc 29 may be filled with high pressure air, pressure oil or not with any medium which only acts as a pressure for a quick return of the feedback disc, and does not provide pedal pressure feedback.

Of course, as an auxiliary explanation of this case, in order to improve the elastic deformation characteristics of the feedback disc 27 or to improve the friction life of the feedback disc 27, a compressive grease or lubricating oil may be added between the two contact surfaces of the push rod 4 and the feedback receiving disc 29 that are in contact with the feedback disc 27, or a graphite medium or the contact surfaces of the push rod 4 and the feedback receiving disc 29 may be subjected to various technological schemes such as plasticizing or saponification.

The feedback disc 27 is triangular in shape as a whole, and the contact part of the feedback disc 27 and the pressure input plug 28 is an inward concave cambered surface matched with the pressure input plug 28.

The reset mechanism 30 is at least one of a honeycomb screen or an elastomeric band. The honeycomb screen is designed according to a cylinder, but other hollow structural members such as triangle, pentagon, hexagon and the like are not excluded.

The push rod 4 is also provided with a rapid air inlet 32 for the outside air to enter the air inlet channel 18 rapidly. The working condition of emergency braking should also be taken into account as a more reliable optimal design. When the pedal is in emergency braking, in order to obtain the maximum boosting force, according to the axial opening and closing characteristics of the air valve of the present patent, a quick air inlet channel (which can be a crescent groove structure, a square groove, a hole and other structures) can be further processed on the push rod 4, so that the air valve can be quickly opened to the maximum opening state, and the maximum boosting force during emergency braking can be realized.

As shown, this case emergency braking situation analysis: when the emergency braking suddenly steps on the pedal, the axial displacement of the push rod 4 can exceed 4.5-5 mm instantly, so that the maximum boosting is achieved. This is because when the emergency braking is performed, the push rod is moved forward suddenly, the cylinder body is not yet moved forward due to inertia hysteresis under the reaction force of the return spring, the separating ring of the cylinder body rapidly opens the air valve completely, namely, the valve membrane rapidly opens and passes over the position of the air inlet key groove, at the moment, the air inflow is maximum, and the air inlet can be filled in the power assisting cavity instantly, so that the maximum power assisting point is rapidly reached.

As a special design of the feedback disc, the 'electrodeless transformation ratio feedback disc' is selected as a research and development object, so as to meet the requirement that the pedal load tends to be consistent as much as possible. The core element of the assembly is an electrodeless feedback disc, and a honeycomb screen mechanism for guaranteeing the electrodeless transformation ratio function of the feedback disc. The function is realized as follows: when the pedal is depressed to pressurize the pressure input plug 28, the three end corners of the feedback disc 27 will move toward the center when the volume of the feedback disc 27 is depressed due to the spherical structure of the feedback receiving disc 29 at the back of the feedback disc 27, thereby forming a triangular-to-circular transition deformation which stops when the deformation is balanced with the elastic force of the 'honeycomb screen' (i.e., the return mechanism 30). Since the area occupied by the circle is larger than the triangle in the case of equal arc length, the larger the area of the feedback disc 27 acting on the feedback receiving disc 29 as the pressure of the pressure input plug 28 increases. Since the assistance ratio ir=s1/S0 (note: S0 is the contact area of the pressure input plug 28 and the feedback disc 27; S1 is the contact area of the feedback receiving disc 29 and the feedback disc 27), the assistance ratio is larger. Therefore, the more advanced the control of the process can be ensured, the greater the pedal force, than the greater. In addition, since the deformation of the feedback disc 27 from triangular to circular transition is a continuous process, the strain referred to as the boost ratio is a continuous "electrodeless" control process, and the mechanism is referred to as an "electrodeless ratio feedback disc system" which has excellent handling characteristics for man-machine control. Of course, as a simplified design, the electrodeless transformation ratio system can eliminate a honeycomb screen, and retain and adopt a vulcanized integral structure of a high-quality elastic hoop (with good high-elastic reset characteristic and high load-sensing stress strain characteristic) and a high-density rubber feedback disc.

Claims

1. The utility model provides a electrodeless transformation ratio vacuum booster of duplex position, it includes casing (1), sets up remove valve body (2) in casing (1), sets up be used for dividing into separating piece (3) of two cavitys with the cavity between casing and the removal valve body between casing (1) and removal valve body (2), be equipped with push rod (4), feedback disc subassembly and ejector pin (5) in proper order in removing valve body (2), two cavitys are first cavity and second cavity respectively, be equipped with in the first cavity and be used for separating into first involucra (8) of first vacuum cavity (6) and first air cavity (7), be equipped with in the second cavity and be used for separating into second involucra (11) of second vacuum cavity (9) and second air cavity (10), its characterized in that: the airtight valve cap assembly is sleeved on the push rod (4), the airtight valve cap assembly comprises a spring seat (12) sleeved on the push rod (4), a spring assembly (13) with one end propped against the spring seat (12) and an airtight valve cap (14) propped against the other end of the spring assembly (13), the upper end of the airtight valve cap (14) is in contact and sealing with the movable valve body (2), an air valve membrane (15) in contact and sealing with the push rod (4) is arranged at the lower end of the airtight valve cap (14), a blocking piece (16) for blocking the airtight valve cap assembly and further enabling the first air cavity and the second air cavity to be communicated with external air is arranged in the movable valve body (2), a first contact ring (17) for propping against the lower end of the airtight valve cap and enabling the air valve membrane at the lower end of the airtight valve cap to be separated from the push rod is arranged between the lower part of the first contact ring (17) and the push rod (4), and an air inlet channel (18) for enabling external air to flow into the first air cavity and the second air cavity is arranged between the lower part of the airtight valve cap (17), and the blocking piece is arranged at an initial state, and the distance L between the airtight valve cap and the blocking piece is 20mm-30mm; the airtight bonnet (14) comprises a bonnet body (21), a first framework (22) arranged on the outer circumference of the bonnet body, a second framework (23) arranged in the inner circumference of the bonnet body and a closing-in coil spring (24) arranged on the inner circumference of the bonnet body, wherein the first framework (22) is contacted with one end of the second framework (23) and can rotate; the feedback disc assembly comprises a feedback disc (27), a pressure input plug (28) with one end propped against the middle part of the feedback disc and the other end propped against the push rod, a feedback receiving disc (29) sleeved outside the pressure input plug and propped against the edge of the feedback disc, a reset mechanism (30) arranged outside the feedback disc and used for helping the feedback disc to reset quickly, and a sealing sleeve (31) used for sleeving the feedback disc, the reset mechanism and the feedback receiving disc, wherein one end of the feedback disc (27) contacted with the pressure input plug (28) is a spherical surface; the whole feedback disc (27) is triangular, and the contact part of the feedback disc (27) and the pressure input plug (28) is a concave cambered surface matched with the pressure input plug (28); the reset mechanism (30) is at least one of a honeycomb screen or an elastic hoop.

2. The double-working-condition stepless transformation ratio vacuum booster according to claim 1, wherein: the middle part of airtight valve cap (14) still is equipped with vacuum valve membrane (19), still be equipped with on blocking piece (16) and be used for with vacuum valve membrane (19) offset and then prevent from the second contact ring (20) of airtight valve cap lower extreme entering gas along airtight valve cap entering first vacuum chamber and second vacuum chamber.

3. The double-working-condition stepless transformation ratio vacuum booster according to claim 2, wherein: the second contact ring (20) and the blocking piece (16) are arranged in a split mode, and a driving spring is arranged between the second contact ring (20) and the blocking piece (16).

4. The double-working-condition stepless transformation ratio vacuum booster according to claim 1, wherein: a filtering ring (25) and a silencing ring (26) are further arranged between the push rod (4) and the movable valve body (2), and the filtering ring (25) and the silencing ring (26) are made of elastically deformable materials.

5. The double-working-condition stepless transformation ratio vacuum booster according to claim 1, wherein: the push rod (4) is also provided with a rapid air inlet channel (32) for external air to enter the air inlet channel (18) rapidly.