CN106968753B - Brake actuating mechanism for engine brake oil way and use method thereof - Google Patents
Brake actuating mechanism for engine brake oil way and use method thereof Download PDFInfo
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- CN106968753B CN106968753B CN201710261281.XA CN201710261281A CN106968753B CN 106968753 B CN106968753 B CN 106968753B CN 201710261281 A CN201710261281 A CN 201710261281A CN 106968753 B CN106968753 B CN 106968753B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2760/00—Control of valve gear to facilitate reversing, starting, braking of four stroke engines
- F01L2760/003—Control of valve gear to facilitate reversing, starting, braking of four stroke engines for switching to compressor action in order to brake
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/04—Reducing noise
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
A brake actuating mechanism for an engine brake oil path comprises a brake chamber, a brake oil chamber arranged in the brake chamber, an adjusting bolt, a ball valve spring seat, a brake spring and a brake piston, wherein engine oil flows into the brake oil chamber after sequentially passing through a side oil hole and a bottom oil hole formed in the adjusting bolt, the bottom oil hole, the ball valve and the ball valve spring are arranged in an up-and-down opposite mode, the bottom end of the ball valve spring is communicated with a spring seat bottom hole at the bottom of the ball valve spring seat, the brake piston sliding up and down along the inner wall of the brake chamber is sleeved outside the brake spring sleeved outside the ball valve spring seat, a valve gap is formed between the bottom of a foot-like middle ball socket connected to the bottom of the brake piston and a valve yoke, and when the brake actuating mechanism is used, the brake oil path is closed through oil discharge and the reaction force of a rocker arm on the brake oil chamber so that the brake oil chamber forms a high-pressure chamber to open the brake. The design has the advantages of good braking effect, strong stability, high sensitivity and contribution to reducing the noise in the operation of the mechanism.
Description
Technical Field
The invention relates to an engine brake control device, belongs to the technical field of vehicle engine braking, and particularly relates to a brake actuating mechanism for an engine brake oil way and a using method thereof.
Background
The engine braking system is a diesel engine cylinder braking technology, generally in a compression release type, and is a technology for forming braking by hydraulically driving one or two exhaust valves to open at the tail end of the compression stroke of an engine and utilizing compression resistance, internal friction force and air intake and exhaust resistance generated by the engine in the dragging process. The compression release type brake generally comprises three types, namely an external type, a special rocker arm type and an integrated rocker arm type, a set of hydraulic components is matched with the on-off of engine oil or the pressure change of the engine oil to realize the formation of a high-pressure oil cavity of a brake piston, and the opening of an exhaust valve is directly or indirectly realized at the tail end of a compression stroke to form braking.
The patent publication No. CN101526018A, the invention patent application with the publication date of 2009, 9.9 discloses a four-stroke internal combustion engine compression brake device, wherein a control valve mechanism and a clearance compensation mechanism are arranged at one end of a rocker arm, wherein the control valve mechanism and the clearance compensation mechanism are arranged in parallel, and the clearance compensation mechanism is used for compensating the lift of a brake bulge; the middle point of the position where the exhaust valve bridge is connected with two rows of valves is provided with a clearance compensation mechanism, the clearance compensation mechanism is used for compensating the clearance amount to be the lift range of the valve clearance, the elephant foot is coaxially connected below the lower end of the previous clearance compensation mechanism, the upper end of the latter clearance compensation mechanism is always contacted with the lower end of the elephant foot, and the spring elasticity of the clearance compensation mechanism is smaller than the brake oil pressure and larger than the self weight of the elephant foot. Although the invention can open two exhaust valves simultaneously when the engine is compressed and braked to improve the braking effect of the engine, the invention still has the following defects:
in the design, when the brake is carried out, the continuous inflow of engine oil is forbidden by actively closing the oil inlet channel, but the oil discharge channel is not limited, the oil discharge is still carried out, a closed cavity is difficult to form in the previous clearance compensation mechanism, the smooth realization of the brake is hindered, even if the smooth realization of the brake is realized, the oil pressure fluctuation in the previous clearance compensation mechanism is large due to the fact that the oil discharge channel is not directly closed, the stability is weak, and the brake effect can be reduced.
Disclosure of Invention
The invention aims to overcome the defects and problems of poor braking effect and poor stability in the prior art, and provides a braking executing mechanism with good braking effect and strong stability for an engine braking oil way and a using method thereof.
In order to achieve the above purpose, the technical solution of the invention is as follows: a brake actuating mechanism for an engine brake oil way comprises a brake chamber, a brake oil cavity and a brake piston, wherein the brake oil cavity and the brake piston are arranged in the brake chamber, the side part of the brake oil cavity is communicated with the brake oil way and an oil discharge way in a rocker arm, the bottom of the brake piston is connected with a elephant foot which is positioned right below the brake piston, and a valve clearance is formed between the bottom of the ball socket in the elephant foot and an air valve yoke which is positioned right below the elephant foot;
the brake actuating mechanism further comprises an adjusting bolt, a ball valve spring seat and a brake spring, wherein the bottom end of the adjusting bolt is located inside the brake chamber, the top end of the adjusting bolt penetrates through the brake chamber and the rocker arm in sequence and then is fixedly connected with the outer wall of the rocker arm, corresponding side oil holes and bottom oil holes are formed in the side face and the bottom face of the bottom end of the adjusting bolt respectively, a brake oil way is communicated with the bottom oil holes after passing through the side oil holes, the ball valve is arranged right below the bottom oil holes, the ball valve spring is arranged right below the ball valve, the bottom end of the ball valve spring is communicated with a spring seat bottom hole at the bottom of the ball valve spring seat, the ball valve and the ball valve spring are contained in the ball valve spring seat, the brake spring is sleeved outside the ball valve spring seat, a brake piston is sleeved outside the brake spring, the outer wall of the brake piston slides up and down along the inner wall of the brake chamber in the brake oil chamber, a brake oil unloading hole is formed in the position between the brake piston and the ball valve spring seat and communicated with the oil unloading way, and the position below the bottom of the brake piston is connected with a elephant foot.
The top end of the adjusting bolt is fixedly connected with the outer wall of the rocker arm through an adjusting nut.
The adjusting bolt is of a T-shaped structure and comprises a bolt fixing part and a bolt oil through part which are perpendicular to each other; the spiral shell leads to oil portion and is waist type structure, including the logical oil top that connects gradually, leads to oily waist and logical oily bottom, the top surface that leads to oily top is connected perpendicularly with the bottom of spiral shell fixed portion, and the bottom surface at logical oil top, the top surface that leads to oily bottom enclose into the annular oil groove of a semi-open-ended ring type with logical oily waist, leads to evenly seted up two at least side oilholes on the oily waist and communicate with each other with the inside bottom surface oilhole of seting up of spiral shell logical oil portion.
The top of the bottom surface oil hole is higher than the side surface oil hole, the bottom of the bottom surface oil hole is flush with the bottom surface of the oil through bottom, and the lowest point of the side surface oil hole is intersected with the top surface of the oil through bottom.
And an oil through chamfer is arranged at the joint part of the oil through bottom in the bottom surface oil hole.
The oil passing top is provided with an oil passing notch corresponding to the side oil hole, the inner bottom edge of the oil passing notch is positioned right above the corresponding side oil hole, the bottom of the side oil hole is connected with the top surface of the oil passing bottom, and a hole periphery distance is formed between the joint of the side oil hole and the oil passing bottom and the side periphery of the oil passing bottom.
The position of nearly its top on the side wall of spiral shell fixed part is provided with the external screw thread in order to with adjusting nut threaded connection, the spiral shell connecting hole has been seted up to the inside on the top of spiral shell fixed part, and the cross section in this spiral shell connecting hole is the polygon.
The ball valve spring seat comprises a base cylinder part and at least two base claw parts, wherein each base claw part is of an L-shaped structure and comprises a transverse claw part and a vertical claw part, and the top end of each vertical claw part is connected with the inner end of the corresponding transverse claw part; the middle part of the base cylinder part is provided with a through base through hole to be communicated with the spring seat bottom hole, the periphery of the top of the base cylinder part is connected with the bottom end of the vertical claw part, and the vertical claw parts are uniformly arranged around the periphery of the top of the base cylinder part.
The brake actuator further comprises any one or two or three of the following technical features: the outer end of the transverse claw part is connected with a downward extending inverted claw edge; spacing claw gaps are arranged between the adjacent vertical claw parts; the diameter of the base through hole is larger than that of the spring seat bottom hole, and a limiting ring surface is arranged between the bottom edge of the base through hole and the top edge of the spring seat bottom hole.
The application method of the brake actuating mechanism for the engine brake oil path comprises any one or two of a valve clearance adjusting process and a brake working condition control process;
the valve clearance adjusting process comprises the following steps: firstly loosening the adjusting nut, then adjusting the height of the adjusting bolt in the vertical direction, then adjusting the distance between the ball socket and the air valve yoke, namely adjusting the width of the air valve clearance, and after the adjustment is finished, tightening the adjusting nut to lock the adjusting bolt, and at the moment, finishing the air valve clearance adjusting process;
the brake condition control process comprises the following steps: firstly, closing an oil discharge way, then, allowing engine oil in a brake oil way to enter a ball valve spring seat through a side oil hole and a bottom oil hole in sequence, pressing down a ball valve, allowing the engine oil entering the ball valve spring seat to flow into a brake piston through a spring seat bottom hole, gradually filling a brake oil cavity, and allowing the engine oil to flow into the oil discharge way through the brake oil discharge hole, wherein the engine oil in the brake oil cavity continuously enters the brake piston but cannot flow out due to the fact that the oil discharge way is not communicated, so that the brake oil cavity forms a closed cavity, and a sufficient ball socket is subjected to a reaction force due to the movement of a rocker arm and a rocker arm roller along with the continuous entering of the engine oil, the reaction force acts on the brake oil cavity through the sufficient brake piston to increase the oil pressure in the brake oil cavity, the increased oil pressure compresses a ball valve spring from bottom to top, the stressed ball valve pushes up to enable the ball valve to move upwards until the bottom surface of the ball valve blocks the oil hole, the brake oil way is blocked, the engine oil does not enter the brake oil cavity any more, and at the moment, and the brake is opened; and then, if the brake is required to be released, the oil discharge way is conducted again to enable the engine oil in the brake oil cavity to flow out through the oil discharge way, and the brake is released.
Compared with the prior art, the invention has the beneficial effects that:
1. in the brake actuating mechanism for the engine brake oil way and the use method thereof, when braking, only the oil unloading way is closed, but the brake oil way is not closed, and the entering of engine oil is not directly hindered, so that a stable closed cavity is easily formed in a brake oil cavity, the realization of braking is facilitated, the braking effect is better, and the stability is stronger; secondly, the pressure of the entering engine oil is easily sensed when the pressure of the engine oil directly acts on the brake oil path, the pressure of the engine oil is conveniently regulated and controlled to control the opening or closing of the oil unloading path, and if the opening or closing of the oil unloading path is controlled through the pressure of the engine oil, the intuition is stronger, the sensitivity is higher, and the control effect is better. Therefore, the invention has the advantages of better braking effect, stronger stability, stronger intuition and higher sensitivity.
2. The invention relates to a brake actuating mechanism for an engine brake oil path and a use method thereof, wherein when the brake is realized, an oil discharge path is closed to change a brake oil chamber into a closed chamber, and the reaction force to the brake oil chamber when a rocker arm and a rocker arm roller move is utilized to further enhance the oil pressure in the brake oil chamber, so that the pressure of the upper end and the lower end of a ball valve is continuously enhanced until the ball valve moves upwards to close the brake oil path, so that the brake oil chamber is changed into a high-pressure chamber, and the brake is started. Therefore, the invention not only has better braking effect, but also has stronger adjustability.
3. In the brake actuating mechanism for the engine brake oil path and the using method thereof, the height of the adjusting bolt in the vertical direction can be adjusted through the adjusting bolt and the adjusting nut (which are in threaded fit with the adjusting bolt to fix the top of the adjusting bolt on the outer wall of the rocker arm) in the brake actuating mechanism under the condition of no engine oil, so that the height of the elephant foot is adjusted, and further, a certain gap is favorably arranged at the bottom of a ball socket in the elephant foot to realize the adjustment of the valve gap. Therefore, the valve clearance adjusting effect of the invention is better.
4. In the brake actuating mechanism for the engine brake oil circuit and the use method thereof, the brake spring is arranged in the brake piston, so that the elephant foot is favorably kept in contact with the valve (or a valve bridge or a valve yoke) and the rocker arm roller is favorably contacted with the camshaft at any time, and the noise in the operation of the mechanism is favorably reduced. Therefore, the invention is beneficial to reducing the noise in the mechanism operation.
Drawings
FIG. 1 is a schematic diagram of the present invention in a non-braking condition.
FIG. 2 is a schematic diagram of the present invention in the brake oil charge.
Fig. 3 is a schematic view of the present invention in a braking condition.
Fig. 4 is a schematic perspective view of the adjusting bolt of fig. 1.
Fig. 5 is a cross-sectional view of fig. 4.
Fig. 6 is a perspective view of the ball valve spring seat of fig. 1.
Fig. 7 is a cross-sectional view of fig. 6.
Fig. 8 is a schematic structural view of the engine brake oil path to which the present invention is applied.
In the figure: the brake actuating mechanism 1, an adjusting bolt 2, a side oil hole 21, a bottom oil hole 22, an oil through chamfer 221, an adjusting nut 23, a screw fixing part 24, a screw connecting hole 241, a screw oil through part 25, an oil through top part 251, an oil through waist part 252, an oil through bottom part 253, an oil through groove 254, an oil through notch 26, an inner bottom edge 261, a hole surrounding distance 27, a ball valve spring seat 3, a spring seat bottom hole 31, a base cylinder part 32, a base through hole 321, a base claw part 33, a transverse claw part 331, a vertical claw part 332, a pawl reversing edge 333, a spacing claw gap 34, a spacing ring surface 35, a rocker arm 4, a rocker arm roller 41, a roller pin 42, a brake oil path 5, a slant oil path 51, a longitudinal oil path 52, an oil discharge path 6, a control valve 7, a control chamber 71, a control piston 72, a control spring 73, a control spring seat 74, a control oil discharge hole 75, a shaft 8, an in-shaft oil path 81, a brake chamber 9, a ball head 10, a brake spring 11, a brake spring 12, a brake piston 14, a elephant foot 15, a ball oil chamber 151, a ball discharge oil chamber 152, a ball valve yoke 16, a ball valve yoke 18, and a clearance gap 17.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 8, a brake actuating mechanism for an engine brake oil path comprises a brake chamber 9, a brake oil chamber 13 and a brake piston 14, wherein the brake oil chamber 13 and the brake piston 14 are arranged in the brake chamber, the side part of the brake oil chamber 13 is communicated with a brake oil path 5 and an oil discharge path 6 in a rocker arm 4, the bottom of the brake piston 14 is connected with a elephant foot 15 which is positioned right below the brake piston, and a valve clearance 18 is formed between the bottom of a ball socket 152 in the elephant foot 15 and a valve yoke 17 which is positioned right below the elephant foot;
the brake actuating mechanism further comprises an adjusting bolt 2, a ball valve 10, a ball valve spring 11, a ball valve spring seat 3 and a brake spring 12, the bottom end of the adjusting bolt 2 is located inside the brake chamber 9, the top end of the adjusting bolt 2 penetrates through the brake chamber 9 and the rocker arm 4 in sequence and then is fixedly connected with the outer wall of the rocker arm 4, the side face and the bottom face of the bottom end of the adjusting bolt 2 are respectively provided with a side face oil hole 21 and a bottom face oil hole 22, a brake oil path 5 is communicated with the bottom face oil hole 22 after passing through the side face oil hole 21, the ball valve 10 is arranged right below the bottom face oil hole 22, the ball valve spring 11 is arranged right below the ball valve 10, the bottom end of the ball valve spring 11 is communicated with a spring seat bottom hole 31 at the bottom of the ball valve spring seat 3, the ball valve 10 and the ball valve spring 11 are contained inside the ball valve spring seat 3, the brake ball valve spring 12 is sleeved outside the ball valve spring seat 3, the brake piston 14 is sleeved outside the brake piston 14, the outer wall of the brake piston 14 slides up and down along the inner wall of the brake chamber 9, a brake oil discharge hole 16 is arranged at the position between the brake piston 14 and the brake oil discharge hole 15 is communicated with the brake chamber 9.
The top end of the adjusting bolt 2 is fixedly connected with the outer wall of the rocker arm 4 through an adjusting nut 23.
The adjusting bolt 2 is of a T-shaped structure and comprises a bolt fixing part 24 and a bolt oil through part 25 which are perpendicular to each other; the spiral oil passing portion 25 is of a waist-shaped structure and comprises an oil passing top portion 251, an oil passing waist portion 252 and an oil passing bottom portion 253 which are sequentially connected, the top surface of the oil passing top portion 251 is vertically connected with the bottom portion of the spiral fixing portion 24, the bottom surface of the oil passing top portion 251, the top surface of the oil passing bottom portion 253 and the oil passing waist portion 252 are enclosed to form a semi-open annular oil passing groove 254, and at least two side oil holes 21 are uniformly formed in the oil passing waist portion 252 to be communicated with the bottom oil hole 22 formed in the spiral oil passing portion 25.
The top of the bottom oil hole 22 is higher than the side oil hole 21, the bottom of the bottom oil hole 22 is flush with the bottom of the oil passing bottom 253, and the lowest point of the side oil hole 21 intersects with the top of the oil passing bottom 253.
An oil passing chamfer 221 is formed at the joint of the oil passing bottom 253 in the bottom oil hole 22.
The oil passing top 251 is provided with an oil passing notch 26 corresponding to the side oil hole 21, the inner bottom edge 261 of the oil passing notch 26 is positioned right above the corresponding side oil hole 21, the bottom of the side oil hole 21 is connected with the top surface of the oil passing bottom 253, and a hole circumference distance 27 is formed between the joint of the side oil hole 21 and the oil passing bottom 253 and the side wall of the oil passing bottom 253.
The part near the top end of the side wall of the screw fixing part 24 is provided with an external thread to be in threaded connection with the adjusting nut 23, the inside of the top end of the screw fixing part 24 is provided with a screw connecting hole 241, and the cross section of the screw connecting hole 241 is polygonal.
The ball valve spring seat 3 comprises a base cylinder part 32 and at least two base claw parts 33, wherein the base claw parts 33 are L-shaped structures and comprise a transverse claw part 331 and a vertical claw part 332, and the top end of the vertical claw part 332 is connected with the inner end of the transverse claw part 331; the middle part of the base cylinder part 32 is provided with a through base through hole 321 to be communicated with the spring seat bottom hole 31, the top periphery of the base cylinder part 32 is connected with the bottom end of the vertical claw part 332, and the vertical claw parts 332 are uniformly arranged around the top periphery of the base cylinder part 32.
The brake actuator further comprises any one or two or three of the following technical features: the outer end of the transverse claw part 331 is connected with a downward extending inverted claw edge 333; a spacing claw gap 34 is arranged between the adjacent vertical claw parts 332; the diameter of the base through hole 321 is larger than that of the spring seat bottom hole 31, and a limit ring surface 35 is arranged between the bottom edge of the base through hole 321 and the top edge of the spring seat bottom hole 31.
The application method of the brake actuating mechanism for the engine brake oil path comprises any one or two of a valve clearance adjusting process and a brake working condition control process;
the valve clearance adjusting process comprises the following steps: firstly loosening the adjusting nut 23, then adjusting the height of the adjusting bolt 2 in the vertical direction, then adjusting the distance between the ball socket 152 and the air valve yoke 17, namely adjusting the width of the air valve clearance 18, and after the adjustment is finished, screwing the adjusting nut 23 to lock the adjusting bolt 23, and at the moment, finishing the air valve clearance adjusting process;
the brake condition control process comprises the following steps: firstly, closing the oil discharge path 6, then, the engine oil in the brake oil path 5 sequentially enters the ball valve spring seat 3 through the side oil hole 21 and the bottom oil hole 22, and presses the ball valve 10 downwards, at the same time, the engine oil entering the ball valve spring seat 3 flows into the brake piston 14 through the spring seat bottom hole 31, gradually fills the brake oil chamber 13, and then flows into the oil discharge path 6 through the brake oil discharge hole 16, because the oil discharge path 6 is not communicated, the engine oil in the brake oil chamber 13 continuously enters and cannot flow out, so that the brake oil chamber 13 forms a closed chamber, and along with the continuous entry of the engine oil, the ball socket 152 in the foot 15 is subjected to a reaction force due to the movement of the rocker arm 4 and the rocker arm roller 41, the reaction force acts on the brake oil chamber 13 through the foot 15 and the brake piston 14 to increase the oil pressure in the brake oil chamber 13, the increased oil pressure compresses the ball valve spring 11 from bottom to top, the ball valve spring 11 pushes up the ball valve 10 to enable the ball valve 10 to move upwards, until the bottom surface 22 is blocked, and the brake oil path 5 is blocked, and the engine oil in the brake oil path 5 does not enter the brake ball valve 13 any more; subsequently, if the brake needs to be released, the oil discharge passage 6 is conducted again to allow the engine oil in the brake oil chamber 13 to flow out through the oil discharge passage 6, and the brake is released.
The principle of the invention is illustrated as follows:
the elephant foot 15 in the invention is a general term of the ball head 151 and the ball socket 152, and the bottom of the ball head 151 is matched with a groove in the ball socket 152. When the invention is applied, the pressure of the oil flowing from the outside is controlled by the electromagnetic valve, namely the electromagnetic valve controls the magnitude of the oil pressure.
Adjusting valve clearance: the valve clearance can ensure the normal work of the valve, the valve is not closed tightly due to too small clearance, the starting and power performance are influenced, the abrasion of a valve rocker and a cam shaft can be increased, insufficient air intake and exhaust can be caused due to too large valve clearance, and obvious knocking sound can be generated.
Braking condition: under the braking condition, the elephant foot can receive the reaction force from the valve bridge (or the air valve yoke), and the reaction force can act on the braking oil cavity through the elephant foot and the braking piston in sequence, so that the oil pressure in the braking oil cavity is increased, the increased oil pressure can compress the ball valve spring firstly, and then the ball valve is pushed by the ball valve spring to move upwards to block the bottom oil hole below the adjusting bolt, so that the continuous inflow of engine oil is blocked, a high-pressure oil cavity is formed in the braking oil cavity, and the braking is started. In addition, the ball head and the ball socket can be guaranteed by the brake spring in the brake piston, the ball socket and the valve bridge are in contact under any working condition, if the spring is not arranged, a gap can be formed between the ball socket and the valve bridge in the operation process, the gap can cause collision, and the collision can increase noise.
The number of the side oil holes 21 is preferably four and evenly arranged around the same circumference. The number of the base claw portions 33 is also preferably four, and are uniformly arranged around the same circumference.
Example 1:
referring to fig. 1 to 8, a brake actuating mechanism for an engine brake oil path comprises a brake chamber 9, a brake oil chamber 13 and a brake piston 14, wherein the brake oil chamber 13 and the brake piston 14 are arranged in the brake chamber, the side part of the brake oil chamber 13 is communicated with a brake oil path 5 and an oil discharge path 6 in a rocker arm 4, the bottom of the brake piston 14 is connected with a elephant foot 15 which is positioned right below the brake piston, and a valve clearance 18 is formed between the bottom of a ball socket 152 in the elephant foot 15 and a valve yoke 17 which is positioned right below the elephant foot; the brake actuating mechanism further comprises an adjusting bolt 2, a ball valve 10, a ball valve spring 11, a ball valve spring seat 3 and a brake spring 12, the bottom end of the adjusting bolt 2 is located inside the brake chamber 9, the top end of the adjusting bolt 2 penetrates through the brake chamber 9 and the rocker arm 4 in sequence and then is fixedly connected with the outer wall of the rocker arm 4, the side face and the bottom face of the bottom end of the adjusting bolt 2 are respectively provided with a side face oil hole 21 and a bottom face oil hole 22, a brake oil path 5 is communicated with the bottom face oil hole 22 after passing through the side face oil hole 21, the ball valve 10 is arranged below the bottom face oil hole 22 in an opposite mode, the ball valve spring 11 is arranged below the ball valve 10 in an opposite mode, the bottom end of the ball valve spring 11 is communicated with a spring seat bottom hole 31 at the bottom of the ball valve spring seat 3, the ball valve spring seat 3 and the ball valve spring 11 are contained inside, the brake ball valve spring seat 3 is sleeved with the brake ball valve spring seat 12 outside, the brake piston 14 is sleeved outside the brake spring seat 12, the outer wall of the brake piston 14 slides up and down along the inner wall of the brake chamber 9 in the brake oil chamber 13, a brake piston 14, a brake oil discharge hole 16 is arranged at a position between the brake piston 14 and the ball valve seat 3, and is communicated with the brake oil discharge hole 6, and the brake chamber 14 is connected with the brake chamber 15 at the brake chamber 9. The top end of the adjusting bolt 2 is preferably fixedly connected with the outer wall of the rocker arm 4 through an adjusting nut 23.
The application method of the brake actuating mechanism for the engine brake oil way comprises any one or two of a valve clearance adjusting process and a brake working condition control process;
the valve clearance adjusting process comprises the following steps: firstly loosening the adjusting nut 23, then adjusting the height of the adjusting bolt 2 in the vertical direction, then adjusting the distance between the ball socket 152 and the air valve yoke 17, namely adjusting the width of the air valve clearance 18, and after the adjustment is finished, screwing the adjusting nut 23 to lock the adjusting bolt 23, and at the moment, finishing the air valve clearance adjusting process;
the brake working condition control process comprises the following steps: firstly, closing the oil discharge path 6, then, the engine oil in the brake oil path 5 sequentially enters the ball valve spring seat 3 through the side oil hole 21 and the bottom oil hole 22 (the engine oil can enter before or after closing the oil discharge path 6), and presses the ball valve 10 downwards, meanwhile, the engine oil entering the ball valve spring seat 3 flows into the brake piston 14 through the spring seat bottom hole 31, gradually fills the brake oil chamber 13, and then flows into the oil discharge path 6 through the brake oil discharge hole 16, because the oil discharge path 6 is not communicated, the engine oil in the brake oil chamber 13 continuously enters and cannot flow out, so that the brake oil chamber 13 forms a closed chamber, when the engine oil continuously enters, the ball socket 152 in the foot 15 is subjected to a reaction force due to the movement of the rocker arm 4 and the rocker arm roller 41, the reaction force acts on the brake oil chamber 13 through the foot 15 and the brake piston 14 to increase the oil pressure in the brake oil chamber 13, the increased oil pressure can compress the ball valve spring 11 from bottom to top, the ball valve spring 11 is forced to enable the ball valve spring 10 to move upwards, until the bottom oil chamber 22 blocks the oil hole 22, the brake oil chamber 5 is not blocked, and then the ball valve 13 is opened; subsequently, if the brake needs to be released, the oil discharge passage 6 is conducted again to allow the engine oil in the brake oil chamber 13 to flow out through the oil discharge passage 6, and the brake is released.
Example 2:
the basic contents are the same as example 1, except that:
the adjusting bolt 2 is of a T-shaped structure and comprises a bolt fixing part 24 and a bolt oil through part 25 which are perpendicular to each other; the spiral oil passing portion 25 is of a waist-shaped structure and comprises an oil passing top portion 251, an oil passing waist portion 252 and an oil passing bottom portion 253 which are sequentially connected, the top surface of the oil passing top portion 251 is vertically connected with the bottom portion of the spiral fixing portion 24, the bottom surface of the oil passing top portion 251, the top surface of the oil passing bottom portion 253 and the oil passing waist portion 252 are enclosed to form a semi-open annular oil passing groove 254, and at least two side oil holes 21 are uniformly formed in the oil passing waist portion 252 to be communicated with the bottom oil hole 22 formed in the spiral oil passing portion 25. The top of the bottom oil hole 22 is higher than the side oil hole 21, the bottom of the bottom oil hole 22 is flush with the bottom of the oil passing bottom 253, and the lowest point of the side oil hole 21 intersects with the top of the oil passing bottom 253. An oil passing chamfer 221 is formed at a position in the bottom oil hole 22, which is connected with the oil passing bottom 253.
Example 3:
the basic content is the same as that of the embodiment 2, except that:
the oil passing top 251 is provided with an oil passing notch 26 corresponding to the side oil hole 21, the inner bottom edge 261 of the oil passing notch 26 is positioned right above the corresponding side oil hole 21, the bottom of the side oil hole 21 is connected with the top surface of the oil passing bottom 253, and a hole circumference distance 27 is formed between the joint of the side oil hole 21 and the oil passing bottom 253 and the side wall of the oil passing bottom 253. The part near the top end of the side wall of the screw fixing part 24 is provided with an external thread to be in threaded connection with the adjusting nut 23, the inside of the top end of the screw fixing part 24 is provided with a screw connecting hole 241, and the cross section of the screw connecting hole 241 is polygonal.
Example 4:
the basic contents are the same as example 1, except that:
the ball valve spring seat 3 comprises a base cylinder part 32 and at least two base claw parts 33, wherein the base claw parts 33 are L-shaped structures and comprise a transverse claw part 331 and a vertical claw part 332, and the top end of the vertical claw part 332 is connected with the inner end of the transverse claw part 331; the middle part of the base cylinder part 32 is provided with a through base through hole 321 to be communicated with the spring seat bottom hole 31, the top periphery of the base cylinder part 32 is connected with the bottom end of the vertical claw part 332, and the vertical claw parts 332 are uniformly arranged around the top periphery of the base cylinder part 32.
Example 5:
the basic contents are the same as example 4, except that:
the brake actuator further comprises any one or two or three of the following technical features: the outer end of the transverse claw part 331 is connected with a downward extending inverted claw edge 333; a spacing claw gap 34 is arranged between the adjacent vertical claw parts 332; the diameter of the base through hole 321 is larger than that of the spring seat bottom hole 31, and a limit ring surface 35 is arranged between the bottom edge of the base through hole 321 and the top edge of the spring seat bottom hole 31.
Example 6:
the basic contents are the same as embodiment 1, except that the engine brake oil path control device and the control process thereof applied in the present invention are as follows:
a kind of engine brakes the oil circuit controlling device, including rocker arm 4, brake actuating mechanism 1, rocker shaft 8, rocker roller 41 and control valve 7, the said control valve 7 includes the control chamber 71 and control piston 72, control spring 73, control spring seat 74 that are arranged sequentially from top to bottom in it, the said control piston 72 moves up and down along the inner wall of the control chamber 71, the bottom of the control piston 72 links with middle part of the control spring seat 74 through the control spring 73, the position located below the control spring 73 in the control spring seat 74 offers the control oil discharge hole 75 that link up, the position located between control piston 72, control spring seat 74 on the sidewall of the control chamber 71 communicates with oil discharge circuit 6; the brake oil path 5 comprises an oblique oil path 51 and a longitudinal oil path 52 which are intersected, the lower end opening of the oblique oil path 51 is communicated with an in-shaft oil path 81 of the rocker shaft 8, the higher end opening of the oblique oil path 51 is communicated with the bottom surface oil hole 22 after passing through the side surface oil hole 21, a brake oil discharging hole 16 is formed in the position, located between the brake piston 14 and the ball valve spring seat 3, on the side wall of the brake oil cavity 13 to be communicated with the oil discharging path 6, the top end opening of the control chamber 71 is communicated with the bottom of the longitudinal oil path 52, and the top of the longitudinal oil path 52 penetrates through the oblique oil path 51 and extends to the upper side of the longitudinal oil path.
The control process of the engine brake oil path control device comprises a non-braking working condition and a braking working condition, and is specifically as follows:
under the non-braking working condition, the pressure of the engine oil entering the braking oil path 5 through the rocker shaft 8 is smaller than the spring force of the control spring 73, the engine oil entering the longitudinal oil path 52 cannot compress the control spring 73, the control spring 73 is in an extension state, and at the moment, the engine oil entering the braking oil path 5 sequentially passes through the inclined oil path 51, the braking oil cavity 13, the oil discharge path 6 and the control chamber 71 and finally flows out of the control oil discharge hole 75.
Under the braking condition, the pressure of the engine oil entering the braking oil path 5 through the rocker shaft 8 is greater than the spring force of the control spring 73, the engine oil entering the longitudinal oil path 52 continuously compresses the control spring 73 until the descending control piston 72 blocks the oil discharge path 6 so that the engine oil in the oil discharge path 6 does not enter the control chamber 71 any more, at this time, the engine oil flowing into the braking oil chamber 13 from the inclined oil path 51 does not flow out through the oil discharge path 6 any more, the braking oil chamber 13 forms a closed chamber, and simultaneously with the continuous entering of the engine oil, the ball socket 152 in the similar foot 15 is subjected to a reaction force due to the movement of the rocker arm 4 and the rocker arm roller 41, the reaction force acts on the braking oil chamber 13 through the similar foot 15 and the braking piston 14, the oil pressure in the braking oil chamber 13 is continuously increased until the braking oil chamber 13 forms a high-pressure oil chamber, the inclined oil path 51 is blocked, no more the engine oil enters the braking oil chamber 13, and at this time, the braking is started; subsequently, if the brake needs to be closed, the pressure of the engine oil entering the brake oil path 5 through the rocker shaft 8 is only reduced until the engine oil pressure is smaller than the spring force of the control spring 73, the control piston 72 moves upwards under the action of the rebound force of the control spring 73 until the oil discharge path 6 and the control chamber 71 are conducted, at this time, the engine oil in the brake oil chamber 13 flows out through the oil discharge path 6, the control chamber 71 and the control oil discharge hole 75 in sequence, and the brake is released.
Claims (6)
1. The utility model provides a brake actuating mechanism for engine brake oil circuit, includes brake chamber (9) and the inside brake oil chamber (13) that sets up of inside, brake piston (14), the lateral part of brake oil chamber (13) communicates with each other with brake oil circuit (5), oil discharge way (6) in rocking arm (4), the bottom of brake piston (14) is connected with be located its directly below like sufficient (15), be formed with valve clearance (18) between the bottom of ball nest (152) in like sufficient (15) and be located its directly below valve yoke (17), its characterized in that:
the brake actuating mechanism further comprises an adjusting bolt (2), a ball valve (10), a ball valve spring (11), a ball valve spring seat (3) and a brake spring (12), the bottom end of the adjusting bolt (2) is positioned inside the brake chamber (9), the top end of the adjusting bolt (2) sequentially penetrates through the brake chamber (9) and the rocker arm (4) and then is fixedly connected with the outer wall of the rocker arm (4), the side surface and the bottom surface of the bottom end of the adjusting bolt (2) are respectively provided with a corresponding side surface oil hole (21) and a corresponding bottom surface oil hole (22), a brake oil way (5) is communicated with the bottom surface oil hole (22) after passing through the side surface oil hole (21), the ball valve (10) is arranged right below the bottom oil hole (22), the ball valve spring (11) is arranged right below the ball valve (10), the bottom end of the ball valve spring (11) is communicated with the spring seat bottom hole (31) at the bottom of the ball valve spring seat (3), the ball valve (10) and the ball valve spring (11) are contained in the ball valve spring seat (3), the brake spring (12) is sleeved outside the ball valve spring seat (3), the brake piston (14) is sleeved outside the brake spring (12), the outer wall of the brake piston (14) slides up and down in the brake oil cavity (13) along the inner wall of the brake chamber (9), and the brake piston (14) is positioned on the side wall of the brake oil cavity (13), A braking oil discharge hole (16) is formed in the position between the ball valve spring seats (3) to be communicated with the oil discharge path (6), and the position, below the braking chamber (9), on the bottom of the braking piston (14) is connected with the elephant foot (15);
the top end of the adjusting bolt (2) is fixedly connected with the outer wall of the rocker arm (4) through an adjusting nut (23);
the adjusting bolt (2) is of a T-shaped structure and comprises a screw fixing part (24) and a screw oil through part (25) which are perpendicular to each other; the spiral oil passing part (25) is of a waist-shaped structure and comprises an oil passing top part (251), an oil passing waist part (252) and an oil passing bottom part (253) which are sequentially connected, the top surface of the oil passing top part (251) is vertically connected with the bottom of the spiral fixing part (24), the bottom surface of the oil passing top part (251), the top surface of the oil passing bottom part (253) and the oil passing waist part (252) enclose a semi-open annular oil passing groove (254), and at least two side oil holes (21) are uniformly formed in the oil passing waist part (252) to be communicated with the bottom oil hole (22) formed in the spiral oil passing part (25);
the top of the bottom oil hole (22) is higher than the side oil hole (21), the bottom of the bottom oil hole (22) is flush with the bottom of the oil through bottom (253), and the lowest point of the side oil hole (21) is intersected with the top surface of the oil through bottom (253);
the ball valve spring seat (3) comprises a base cylinder part (32) and at least two base claw parts (33), the base claw parts (33) are of L-shaped structures and comprise transverse claw parts (331) and vertical claw parts (332), and the top ends of the vertical claw parts (332) are connected with the inner ends of the transverse claw parts (331); the middle part of the base cylinder part (32) is provided with a through base through hole (321) to be communicated with the spring seat bottom hole (31), the periphery of the top part of the base cylinder part (32) is connected with the bottom end of the vertical claw part (332), and the vertical claw parts (332) are uniformly arranged around the periphery of the top part of the base cylinder part (32).
2. The brake actuator for an engine brake fluid circuit according to claim 1, characterized in that: an oil passing chamfer (221) is formed at the joint part of the bottom oil hole (22) and the oil passing bottom (253).
3. The brake actuator for an engine brake fluid circuit according to claim 1, characterized in that: an oil passing notch (26) corresponding to the side oil hole (21) is formed in the oil passing top portion (251), an inner bottom edge (261) of the oil passing notch (26) is located right above the corresponding side oil hole (21), the bottom of the side oil hole (21) is connected with the top surface of the oil passing bottom portion (253), and a hole surrounding distance (27) is formed between the joint of the side oil hole (21) and the oil passing bottom portion (253) and the side wall of the oil passing bottom portion (253).
4. The brake actuator for an engine brake fluid circuit according to claim 1, characterized in that: the adjusting nut is characterized in that an external thread is arranged on a position, close to the top end, of the side wall of the screw fixing portion (24) to be in threaded connection with the adjusting nut (23), a screw connecting hole (241) is formed in the top end of the screw fixing portion (24), and the cross section of the screw connecting hole (241) is polygonal.
5. The brake actuator for the engine brake oil circuit according to claim 1, characterized by further comprising any one or two or three of the following technical features:
the outer end of the transverse claw part (331) is connected with a downward extending inverted claw edge (333);
spacing claw gaps (34) are formed between the adjacent vertical claw parts (332);
the diameter of the base through hole (321) is larger than that of the spring seat bottom hole (31), and a limiting ring surface (35) is arranged between the bottom edge of the base through hole (321) and the top edge of the spring seat bottom hole (31).
6. The use method of the brake actuating mechanism for the engine brake oil circuit is characterized by comprising any one or two of a valve clearance adjusting process and a brake working condition control process;
the valve clearance adjusting process comprises the following steps: firstly loosening the adjusting nut (23), then adjusting the height of the adjusting bolt (2) in the vertical direction, then adjusting the distance between the ball socket (152) and the air valve yoke (17), namely adjusting the width of the air valve clearance (18), and after the adjustment is finished, tightening the adjusting nut (23) to lock the adjusting bolt (2), and at the moment, finishing the air valve clearance adjusting process;
the brake condition control process comprises the following steps: firstly closing the oil discharge passage (6), then, the engine oil in the brake oil passage (5) enters the ball valve spring seat (3) through the side oil hole (21) and the bottom oil hole (22) in sequence, and presses down the ball valve (10), meanwhile, the engine oil entering the ball valve spring seat (3) flows into the brake piston (14) through the spring seat bottom hole (31), gradually filling the brake oil chamber (13) and then flowing into the oil discharge passage (6) through the brake oil discharge hole (16), because the oil discharge way (6) is not communicated any more, the engine oil in the brake oil cavity (13) continuously enters and cannot flow out, so that the brake oil cavity (13) forms a closed cavity, and when the engine oil continuously enters, the ball socket (152) in the elephant foot (15) is subjected to reaction force due to the movement of the rocker arm (4) and the rocker arm roller (41), the reaction force acts on the brake oil chamber (13) through the elephant foot (15) and the brake piston (14), increasing the oil pressure in the brake oil cavity (13), wherein the increased oil pressure can compress the ball valve spring (11) from bottom to top, the stressed ball valve spring (11) pushes the ball valve (10) upwards to enable the ball valve (10) to move upwards until the ball valve (10) blocks the bottom oil hole (22), the brake oil cavity (5) is blocked, the engine oil in the brake oil cavity (5) does not enter the brake oil cavity (13), and at the moment, the brake is started; and then, if the brake needs to be released, the oil unloading path (6) is conducted again to enable the engine oil in the brake oil cavity (13) to flow out through the oil unloading path (6), and the brake is released.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710261281.XA CN106968753B (en) | 2017-04-20 | 2017-04-20 | Brake actuating mechanism for engine brake oil way and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710261281.XA CN106968753B (en) | 2017-04-20 | 2017-04-20 | Brake actuating mechanism for engine brake oil way and use method thereof |
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| CN106968753A CN106968753A (en) | 2017-07-21 |
| CN106968753B true CN106968753B (en) | 2023-03-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107956586B (en) * | 2017-12-18 | 2023-09-12 | 东风商用车有限公司 | Engine braking actuating mechanism |
| CN109356683B (en) * | 2018-12-19 | 2020-04-03 | 潍柴动力股份有限公司 | Valve bridge assembly, in-cylinder brake system and engine |
| CN109958492B (en) * | 2019-03-22 | 2024-04-23 | 东风商用车有限公司 | Adjustable engine brake actuating mechanism and application method thereof |
| CN111720184A (en) * | 2020-06-29 | 2020-09-29 | 杭州新坐标科技股份有限公司 | Plane hydraulic support piece for large engine |
| CN115949483B (en) * | 2023-03-10 | 2023-06-13 | 龙口中宇热管理系统科技有限公司 | In-cylinder braking mechanism of engine and working method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101526018B (en) * | 2009-03-11 | 2012-05-30 | 浙江黎明发动机零部件有限公司 | Compression braking device of four-stroke cycle internal combustion engine |
| WO2012109780A1 (en) * | 2011-02-15 | 2012-08-23 | 奚勇 | Method and apparatus for resetting valve lift for use in engine brake |
| CN102787880B (en) * | 2011-05-18 | 2014-11-26 | 上海尤顺汽车部件有限公司 | Method and device for manufacturing rocking arm with main piston and auxiliary piston |
| CN102787919B (en) * | 2011-05-18 | 2015-03-04 | 上海尤顺汽车部件有限公司 | Method and device for braking reset rocking arm |
| CN202090977U (en) * | 2011-05-18 | 2011-12-28 | 上海尤顺汽车部件有限公司 | Reset type rocker braking device |
| CN104500164B (en) * | 2015-01-03 | 2017-01-11 | 浙江康和机械科技有限公司 | Integrated engine brake rocker arm structure |
| CN106382140B (en) * | 2016-10-21 | 2018-11-23 | 东风商用车有限公司 | A kind of engine braking control oil channel structures |
| CN206801637U (en) * | 2017-04-20 | 2017-12-26 | 东风商用车有限公司 | Brake actuator for engine braking oil path |
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