CN112963221A - Braking rocker arm and engine - Google Patents
Braking rocker arm and engine Download PDFInfo
- Publication number
- CN112963221A CN112963221A CN202110274216.7A CN202110274216A CN112963221A CN 112963221 A CN112963221 A CN 112963221A CN 202110274216 A CN202110274216 A CN 202110274216A CN 112963221 A CN112963221 A CN 112963221A
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- CN
- China
- Prior art keywords
- rocker arm
- brake
- brake piston
- station
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 39
- 239000008188 pellet Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 11
- 239000006187 pill Substances 0.000 description 10
- 230000008018 melting Effects 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention relates to the field of engines, and discloses a brake rocker arm and an engine. A brake rocker arm comprising: the rocker arm is provided with a guide groove; the brake piston is arranged in the guide groove in a sliding mode, the brake piston is provided with a first station and a second station relative to the rocker arm, when the brake piston is located at the first station, the brake piston is separated from the valve, and when the brake piston is located at the second station, the valve is opened by the brake piston; the thermal deformation driving piece is arranged on the rocker arm, is in transmission connection with the brake piston and is used for driving the brake piston to be switched from a first station to a second station; and one end of the elastic part is connected with the brake piston, and the other end of the elastic part is connected with the rocker arm and used for driving the brake piston to be switched from the second station to the first station. The braking rocker arm controls the braking power of the engine to be different under different vehicle speeds by enabling the braking piston to generate different displacements according to different vehicle speeds.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a brake rocker arm and an engine.
Background
For a traditional braking rocker arm, when an engine brakes, an electromagnetic valve is opened, a braking oil path is communicated, a brake pin is driven by an engine oil pressure device to extend out, and then a braking valve clearance is absorbed, so that an exhaust valve is opened once at an intake stroke bottom dead center and a compression top dead center respectively, and a braking function is completed. The lift of the brake valve is unchanged due to the fact that the extending length of the brake pin is unchanged, and therefore the brake power is unchanged.
Because the optimal braking power required by the diesel engine under different rotating speeds is different, when the extension length of the brake pin is kept unchanged, the phenomenon of insufficient braking power at high rotating speed is likely to occur, and thus the safe running of the vehicle under the emergency conditions of continuous downhill road sections and the like is not facilitated.
Disclosure of Invention
The invention discloses a brake rocker arm and an engine, which are used for controlling the displacement of a brake piston through the thermal deformation.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, the present invention provides a brake rocker arm comprising:
the rocker arm is provided with a guide groove;
the brake piston is arranged in the guide groove in a sliding mode, the brake piston is provided with a first station and a second station relative to the rocker arm, the brake piston is separated from the valve when the brake piston is located at the first station, and the brake piston opens the valve when the brake piston is located at the second station;
the thermal deformation driving piece is arranged on the rocker arm, is in transmission connection with the brake piston and is used for driving the brake piston to be switched from the first station to the second station;
and one end of the elastic piece is connected with the brake piston, and the other end of the elastic piece is connected with the rocker arm and used for driving the brake piston to be switched from the second station to the first station.
In the braking rocker arm, the thermal deformation driving piece is deformed when being heated, so that the braking piston is driven to generate certain displacement, and the valve is opened, namely the braking piston is driven to be switched from a first station to a second station; when the valve needs to be closed, the elastic piece drives the brake piston to switch from the second station to the first station. Therefore, the braking rocker arm can control the acting force of the thermal deformation driving piece by controlling the deformation of the thermal deformation driving piece, so that the size of the valve is adjusted, and different braking powers are finally realized.
Therefore, the braking rocker arm controls the braking power of the engine to be different under different vehicle speeds by enabling the braking piston to generate different displacements according to different vehicle speeds.
Optionally, the thermo-deformable driver comprises:
a rigid housing;
the end cover is connected with the rigid shell in a sealing mode and is matched with the rigid shell to form a containing cavity; the end cover is provided with an avoidance hole, so that the brake piston penetrates through the avoidance hole and extends into the accommodating cavity;
a thermal deformation medium located inside the accommodating cavity;
the flexible piece is sleeved outside the part of the brake piston extending into the accommodating cavity and used for isolating the thermal deformation medium from the brake piston;
the heating assembly is used for heating the thermal deformation medium so as to change the volume of the thermal deformation medium.
Optionally, the thermo-deformation medium comprises amorphous wax pellets.
Optionally, the heating assembly comprises:
the heating resistor is positioned inside the accommodating cavity;
and the power supply is electrically connected with the heating resistor through a lead.
Optionally, the heating assembly further comprises a voltage controller in signal connection with the power supply, and the voltage controller is in signal connection with an engine control module to control the power supply to apply different voltage signals to the heating resistor according to different vehicle speeds.
Optionally, an adjusting screw is connected to one side of the rigid shell, which faces away from the end cover, and the adjusting screw is in threaded connection with the rocker arm;
the adjusting screw and the rigid shell are both provided with wire holes for allowing the wires to pass through.
Optionally, the rigid shell is a metal shell; or,
the flexible piece is a rubber hose with one end closed and the other end open.
Optionally, the end cap is sealingly connected to the rigid housing by a sealing ring.
Optionally, the resilient member is a spring.
In a second aspect, the invention also provides an engine comprising an engine control module and the brake rocker arm of any one of the first aspect, wherein the engine control module is in signal connection with the brake rocker arm.
Drawings
Fig. 1 is a schematic structural diagram of a brake rocker arm provided in an embodiment of the present invention before being powered on;
FIG. 2 is an enlarged view of the thermal deformation driver of FIG. 1;
fig. 3 is a schematic structural diagram of a brake rocker arm provided in the embodiment of the present invention after being powered on;
FIG. 4 is an enlarged view of the thermal deformation driver of FIG. 3;
FIG. 5 is a control schematic diagram of a brake rocker arm according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an engine provided in an embodiment of the present invention before power is applied;
FIG. 7 is a schematic structural diagram of an engine after power is applied to the engine according to an embodiment of the present invention;
fig. 8 is a control schematic diagram of an engine according to an embodiment of the present invention.
Icon: 1-a rocker arm; 11-a guide groove; 2-a brake piston; 3-a thermally deformable driving member; 31-a rigid outer shell; 311-adjusting screws; 312-wire guides; 32-end caps; 33-a heat deformation medium; 34-a flexible member; 35-a heating assembly; 351-heating resistance; 352-a power supply; 353-a lead; 354-voltage controller; 36-a sealing ring; 4-an elastic member; 5-a cam; 6-a brake pin; 7-valve bridge; 8-an engine control module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a first aspect, as shown in fig. 1 to 4, an embodiment of the present invention provides a brake rocker arm 1 including: the rocker arm 1 is provided with a guide groove 11; the brake piston 2 is arranged in the guide groove 11 in a sliding mode, the brake piston 2 is provided with a first station and a second station relative to the rocker arm 1, when the brake piston 2 is located at the first station, the brake piston 2 is separated from the valve, and when the brake piston 2 is located at the second station, the valve is opened by the brake piston 2; the thermal deformation driving piece 3 is arranged on the rocker arm 1, and the thermal deformation driving piece 3 is in transmission connection with the brake piston 2 and is used for driving the brake piston 2 to be switched from a first station to a second station; and one end of the elastic part 4 is connected with the brake piston 2, and the other end of the elastic part 4 is connected with the rocker arm 1 and used for driving the brake piston 2 to be switched from the second station to the first station.
In the braking rocker arm 1, the thermal deformation driving part 3 deforms when heated, so that the braking piston 2 is driven to generate certain displacement, and then the valve is opened, namely the braking piston 2 is driven to switch from a first station to a second station; when the valve needs to be closed, the elastic piece 4 drives the brake piston 2 to switch from the second station to the first station. Therefore, the braking rocker arm 1 can control the acting force of the thermal deformation driving piece 3 by controlling the deformation of the thermal deformation driving piece 3, so as to adjust the size of the valve and finally realize different braking powers.
Therefore, the braking rocker arm 1 controls the braking power of the engine to be different under different vehicle speeds by enabling the braking piston 2 to generate different displacements according to different vehicle speeds.
It should be noted that the thermal deformation driving element 3 mainly functions to absorb heat energy by itself to generate deformation so as to generate driving force to drive the brake piston 2 to generate a certain displacement, and thus any structure capable of achieving the above functions can be referred to as the thermal deformation driving element 3 in this embodiment. Such as structures fabricated using the volume change characteristics of certain media in different forms.
Optionally, the thermo-deformable driver 3 comprises: a rigid outer shell 31; the end cover 32 is connected with the rigid shell 31 in a sealing mode, and the end cover 32 is matched with the rigid shell 31 to form a containing cavity; the end cover 32 is provided with an avoidance hole so that the brake piston 2 penetrates through the avoidance hole and extends into the accommodating cavity; a heat deformation medium 33 located inside the accommodation chamber; the flexible piece 34 is sleeved outside the part, extending into the accommodating cavity, of the brake piston 2 and used for isolating the thermal deformation medium 33 from the brake piston 2; and the heating assembly 35 is used for heating the thermal deformation medium 33 so as to change the volume of the thermal deformation medium 33.
It should be noted that the rigid housing 31 is filled with a thermal deformation medium 33, and a flexible member 34 is inserted into the thermal deformation medium 33 to isolate the thermal deformation medium 33 from the brake piston 2, and the thermal deformation medium 33 is fixed in the closed space by the end cap 32. The heating assembly 35 heats the thermal deformation medium 33, so that the heated volume of the thermal deformation medium 33 is increased, but the thermal deformation medium 33 can only expand towards one side of the flexible part 34 because the rigid shell cannot deform and the flexible part 34 can deform, and the brake piston 2 is pushed to displace. In addition, the volume change rate of the thermal deformation medium 33 can be controlled by controlling the heating assembly 35, so that the driving force of the whole thermal deformation driving piece 3 is not adjusted, and the brake piston 2 is adjusted to generate different displacements.
Optionally, the end cap 32 is sealingly connected to the rigid housing 31 by a sealing ring 36.
Optionally, the heat deformation medium 33 comprises amorphous wax pellets.
It should be noted that the melting volume of the wax pill is increased, and the melting degree of the wax pill is different, and the volume is changed differently.
Alternatively, the rigid shell 31 is a metal shell; alternatively, the flexible member 34 is a rubber hose having one end closed and the other end open, and the rubber hose is fitted over the brake piston 2 to insulate the heat deformation medium 33 from the brake piston 2.
Optionally, the heating assembly 35 comprises: a heating resistor 351 located inside the accommodating chamber; the power source 352, the power source 352 and the heating resistor 351 are electrically connected by a wire 353.
In one possible implementation, the rigid shell 31 is filled with amorphous wax pellets, and rubber hoses are inserted into the wax pellets, and the wax pellets are fixed in the closed space through the end cap 32 and the sealing ring 36. A heating resistor 351 is inserted into the wax pellet, and the heating resistor 351 is connected to a power supply 352 through a wire 353. When a dc voltage signal is applied to the heating resistor 351, the heating resistor 351 is heated, thereby melting the wax pellets. When the wax pills are melted, the volume of the wax pills expands, and the brake piston 2 is pushed by the rubber hose to generate certain displacement. In addition, the wax pills have different melting degrees and different volume expansion rates, so that the brake piston 2 has different displacements, and finally different brake powers are realized.
It should be noted that the heating condition of the resistor can be controlled by controlling the duty ratio of the voltage signal, so as to control the melting condition of the wax pill in the metal shell. An engine control module (ECU) applies different direct-current voltage signals to the heating resistor 351 according to different vehicle speeds, so that the heating resistor 351 is heated to different degrees, and wax pills are melted to different degrees.
Optionally, the heating assembly 35 further comprises a voltage controller 354 in signal communication with the power source 352, the voltage controller 354 being adapted to be in signal communication with the engine control module to control the power source 352 to apply different voltage signals to the heating resistor 351 in response to different vehicle speeds.
In one possible implementation manner, referring to fig. 5, the power source 352 is electrically connected to the heating resistor 351 through a voltage controller 354, the voltage controller 354 is in signal connection with an engine control module (ECU), and the engine control module controls the power source 352 to apply different direct current voltage signals to the heating resistor 351 through controlling the voltage controller 354 according to different vehicle speeds, so that the heating resistor 351 is heated to different degrees, and further wax pills are melted to different degrees.
Optionally, an adjusting screw 311 is connected to a side of the rigid shell 31 away from the end cover 32, and the adjusting screw 311 is in threaded connection with the rocker arm 1; the adjustment screw 311 and the rigid housing 31 are each provided with a wire 353 hole 312 for allowing the wire 353 to pass through.
In a possible way of realisation, the adjustment screw 311 is located inside the rocker arm 1 towards one end of the rigid casing 31 and projects outside the rocker arm 1 at the other end, and this adjustment screw 311 is screwed with the rocker arm 1 to fix the whole rigid casing 31. The adjusting screw 311 and the rigid shell 31 are provided with a lead 353 hole 312, and the lead 353 hole 312 is communicated with the interior of the rigid shell 31 and the exterior of the adjusting screw 311 so as to allow the lead 353 of the heating resistor 351 positioned in the accommodating cavity to pass through the lead 353 hole 312 and be connected with the power supply 352.
Optionally, the elastic member 4 is a spring.
In a second aspect, as shown in fig. 6 and 7, an embodiment of the present invention further provides an engine, which includes an engine control module 8 and the brake rocker arm 1 as in any one of the first aspect, wherein the engine control module 8 is in signal connection with the brake rocker arm 1.
In one possible implementation, referring to fig. 8, the engine control module 8 is in signal connection with the power supply 352, and the engine control module 8 controls the power supply 352 to apply different dc voltage signals to the heating resistor 351 through the control voltage controller 354 according to different vehicle speeds, so as to cause the heating resistor 351 to perform different degrees of heating, and further cause the wax pills to perform different degrees of melting. The wax pills have different melting degrees and different volume expansion rates, so that the brake piston 2 has different displacements, and finally different brake powers are realized.
Besides, the side of the rocker arm 1, which is far away from the brake piston 2, is matched with a cam 5, and the brake piston 2 is matched with a brake pin 6 and a valve bridge 7 to control the opening and closing of the valve.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A brake rocker arm, comprising:
the rocker arm is provided with a guide groove;
the brake piston is arranged in the guide groove in a sliding mode, the brake piston is provided with a first station and a second station relative to the rocker arm, the brake piston is separated from the valve when the brake piston is located at the first station, and the brake piston opens the valve when the brake piston is located at the second station;
the thermal deformation driving piece is arranged on the rocker arm, is in transmission connection with the brake piston and is used for driving the brake piston to be switched from the first station to the second station;
and one end of the elastic piece is connected with the brake piston, and the other end of the elastic piece is connected with the rocker arm and used for driving the brake piston to be switched from the second station to the first station.
2. The brake rocker arm of claim 1 wherein the thermo-deformable driver comprises:
a rigid housing;
the end cover is connected with the rigid shell in a sealing mode and is matched with the rigid shell to form a containing cavity; the end cover is provided with an avoidance hole, so that the brake piston penetrates through the avoidance hole and extends into the accommodating cavity;
a thermal deformation medium located inside the accommodating cavity;
the flexible piece is sleeved outside the part of the brake piston extending into the accommodating cavity and used for isolating the thermal deformation medium from the brake piston;
the heating assembly is used for heating the thermal deformation medium so as to change the volume of the thermal deformation medium.
3. The brake rocker arm of claim 2 wherein the heat deformation medium comprises amorphous wax pellets.
4. The brake rocker arm of claim 2 wherein the heating assembly comprises:
the heating resistor is positioned inside the accommodating cavity;
and the power supply is electrically connected with the heating resistor through a lead.
5. The brake rocker arm of claim 4 wherein the heating assembly further comprises a voltage controller in signal communication with the power supply, the voltage controller for signal communication with an engine control module to control the power supply to apply different voltage signals to the heating resistor according to different vehicle speeds.
6. The brake rocker arm of claim 4 wherein an adjustment screw is coupled to a side of the rigid housing facing away from the end cap, the adjustment screw being threadably coupled to the rocker arm;
the adjusting screw and the rigid shell are both provided with wire holes for allowing the wires to pass through.
7. The brake rocker arm of claim 2 wherein the rigid outer shell is a metal shell; or,
the flexible piece is a rubber hose with one end closed and the other end open.
8. The brake rocker arm of claim 2 wherein the end cap is sealingly connected to the rigid housing by a seal ring.
9. The brake rocker arm of claim 1 wherein the resilient member is a spring.
10. An engine comprising an engine control module and a brake rocker arm as claimed in any one of claims 1 to 9, the engine control module being in signal connection with the brake rocker arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110274216.7A CN112963221B (en) | 2021-03-15 | 2021-03-15 | Braking rocker arm and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110274216.7A CN112963221B (en) | 2021-03-15 | 2021-03-15 | Braking rocker arm and engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112963221A true CN112963221A (en) | 2021-06-15 |
| CN112963221B CN112963221B (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110274216.7A Active CN112963221B (en) | 2021-03-15 | 2021-03-15 | Braking rocker arm and engine |
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| CN112963221B (en) | 2022-01-14 |
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