CN111140378B - Electronic control throttle device for internal combustion engine - Google Patents
Electronic control throttle device for internal combustion engine Download PDFInfo
- Publication number
- CN111140378B CN111140378B CN201910964093.2A CN201910964093A CN111140378B CN 111140378 B CN111140378 B CN 111140378B CN 201910964093 A CN201910964093 A CN 201910964093A CN 111140378 B CN111140378 B CN 111140378B
- Authority
- CN
- China
- Prior art keywords
- throttle
- connecting rod
- spring
- return spring
- load
- 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.)
- Active
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 12
- 238000007789 sealing Methods 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
Classifications
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
- F02D9/1065—Mechanical control linkage between an actuator and the flap, e.g. including levers, gears, springs, clutches, limit stops of the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
- F02D2009/0201—Arrangements; Control features; Details thereof
- F02D2009/0269—Throttle closing springs; Acting of throttle closing springs on the throttle shaft
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
An electronically controlled throttle device for an internal combustion engine capable of using a return spring having a spring constant matched to the sealing performance of a seal member used therefor, preventing a reduction in the life of a motor even when a high pressure resistant seal is used, and preventing damage by reducing friction due to resonance of the return spring. The return spring (9) is disposed on the outer periphery of the connecting rod spring (10), and the load of the connecting rod spring (10) in the thrust direction is set to be larger than the load of the return spring (9) in the thrust direction.
Description
Technical Field
The present invention relates to a throttle device for an internal combustion engine (engine), and more particularly, to an electronically controlled throttle device in which a throttle valve (throttle valve) is driven by an electric actuator such as a motor.
Background
Conventionally, an electronically controlled throttle device is known in which a throttle valve of an internal combustion engine is controlled by an electric actuator such as a motor.
However, such an electronically controlled throttle device basically controls intake air of an engine by driving an electric actuator to open a throttle valve having a return spring based on an opening degree signal from a throttle sensor and based on a control signal from an ECU.
Therefore, when the electric power supply to the electric actuator is accidentally cut off during running, the throttle valve returns to the fully closed position by the biasing force of the return spring, and is brought into a state where running is disabled after rapid deceleration. When the throttle valve is left in a fully closed state for a long period of time during the stop of the engine, combustion products (tar or carbon) in the intake pipe adhere to the space between the throttle valve and the inner wall of the intake pipe, and the throttle valve and the inner wall of the intake pipe cannot be opened by the starting torque of the electric actuator. In an electronically controlled throttle device in which a throttle valve is controlled by an electric actuator, safety assurance (limp-home mode) when the actuator fails is a significant problem.
In order to solve this problem, for example, japanese patent application laid-open No. 2003-37002 (patent document 1) and the like disclose a device in which a safety stopper is provided that prevents the throttle valve from being fully closed when the electric actuator fails and the throttle valve is rotated in the fully closing direction by the urging force of the return spring. However, these secure stoppers utilize motor drive control to suppress the force of the return spring to return slowly to the fully open position, require various sensors or electronic devices and require complicated control, and have a problem of additionally consuming motor drive power.
In this regard, for example, japanese patent application laid-open No. 2002-256894 (patent document 2) and the like disclose an electronically controlled throttle device for use in an internal combustion engine and for controlling the amount of intake air, the electronically controlled throttle device having two types of springs, namely, a return spring that returns a throttle valve to a throttle portion and a preset spring (Default spring) that returns the throttle valve from a fully closed state to an opening degree (preset opening degree) to which the throttle valve can be moved by itself.
However, in the electronic control throttle device using the conventional preset spring, there is a problem in that resonance caused by the return spring may cause mutual friction between adjacent wires or friction of the guide when the throttle valve is closed, thereby being damaged.
Therefore, a method of suppressing the amplitude by making the interval between the guides in the return spring as narrow as possible, or a method of increasing the inter-line interval and eliminating the overlapping of the resonance points by using a compression spring having a high spring constant and a high thrust load, or the like is generally employed, however, there are problems in that the method for preventing resonance caused by the conventional return spring is difficult to design or assemble, or an expensive spring is required.
On the other hand, in a high-pressure engine or the like, for example, in order to secure the sealability of the throttle shaft at a portion supported by the throttle body, it is necessary to use a compression-resistant (high-strength) seal member, but in this case, as shown in fig. 6, there is a problem that, compared to the case where a seal member is not used or the case where a seal member of a conventional normal strength is used, there is a large friction force at the time of opening and closing, as the hysteresis of opening and closing of the valve increases, the life of the motor decreases in the opening direction, and the return speed delays in the closing direction, and on the other hand, when the friction force of the seal member decreases, there is a problem that durability deteriorates due to deterioration of the sealability in the high-pressure engine, and in particular, when a spring having a high spring constant is used as the return spring, since the throttle shaft requires a larger torque, the durability further decreases.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2003-37002
Patent document 2: japanese patent laid-open No. 2002-256894
Disclosure of Invention
Problems to be solved by the invention
The present invention relates to an electronic control throttle device for an internal combustion engine, in which a throttle gear is fixed to a base end portion of a throttle shaft pivotally supported by a conventional throttle body and having a throttle, the throttle gear is configured to transmit a driving force from an electric actuator disposed on the throttle body in a direction to open the throttle, a connecting rod is disposed between the throttle gear of the throttle shaft and the throttle body so as to be rotatable within a predetermined range with respect to an axial direction and movable in the axial direction, the connecting rod is locked to the throttle body in a preset state to restrict rotation, a return spring is connected between the throttle gear and the throttle body, the return spring is configured to return the throttle valve to a preset position when the driving force from the electric actuator is cut off, and a connecting rod spring is connected between the connecting rod and the throttle gear, and the electronic control throttle device has a problem that a return spring having a spring constant matching a sealing performance of a sealing member used therein can be used, and can prevent a resonance from being caused by a reduction in a life due to a reduction in a resonance spring even when a high-pressure-resistant seal is used.
Means for solving the problems
In order to solve the above-described problem, in the electronically controlled throttle device of an internal combustion engine according to the present invention, the return spring is disposed on an outer periphery of the connecting rod spring, and a load of the connecting rod spring in a thrust direction is set to be larger than a load of the return spring in the thrust direction.
According to the present invention, since the return spring having a low spring constant can be set, an increase in torque applied to the throttle shaft can be prevented.
Further, by setting the load of the connecting rod spring in the thrust direction to be larger than the load of the return spring in the thrust direction, the connecting rod is pressed against the seat of the throttle shaft formed on the throttle body by the reaction force of the connecting rod spring, whereby resonance generated when the return spring is operated (at the time of return) is suppressed by restricting the thrust position.
In particular, in the present invention, the return spring is set to be in a closely wound state at the time of assembly or in a closely wound state with the rotational operation of the throttle valve, and the connecting rod is movable while operating, whereby resonance generated at the time of return operation of the return spring can be absorbed and reliably suppressed.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the spring constant of the return spring can be optimally designed according to the friction of the seal member, the resistance when the throttle valve is operated in the opening direction can be reduced, the service life of the motor can be increased, the throttle valve can be reliably returned in the closing direction, the return failure can be prevented, and the resonance of the return spring generated at the time of closing can be suppressed.
Drawings
Fig. 1 is a perspective view showing an exploded state of a preferred embodiment of the present invention.
Fig. 2 is a longitudinal section of the embodiment shown in fig. 1.
Fig. 3 is a cross-sectional view of the embodiment shown in fig. 1.
Fig. 4 is a front view of the preset position and the fully opened position of the valve in the embodiment shown in fig. 1, and an explanatory view showing the states of the return spring, the connecting rod, and the connecting rod spring of the respective positions.
Fig. 5 is a graph showing a relationship between the valve opening and the torque of the throttle shaft in the embodiment shown in fig. 1.
Fig. 6 is a graph of the relationship between the valve opening and the torque of the throttle shaft in the prior art example.
Description of the reference numerals
1 throttle body, 2 throttle valve, 3 throttle shaft, 4 seal member, 5 seat, 6 electric actuator, 7 throttle gear, 8 connecting rod, 9 return spring, 10 connecting rod spring, 11 intake passage, 12 shaft hole, 13 seat, 14 housing, 15 receiving recess, 16 locking projection, 31 locking screw, 32 front end portion, 33 base end portion, 61 rotation shaft, 62 reduction gear, 63 rotation gear, 71 gear portion, 72 recess, 81 locking projection, central axis of C intake passage
Detailed Description
Fig. 1 to 3 show a preferred embodiment of the present invention, in which an intake passage 11 is formed in a through-hole manner in a throttle body 1 cast of a light alloy such as aluminum, the intake passage 11 is cylindrical and connected to an intake pipe (not shown) of an internal combustion engine (engine), and a throttle shaft 3 is pivotally supported on the throttle body 1 so as to be orthogonal to a central axis C of the intake passage 11, and a circular throttle valve 2 is fixed to the throttle shaft 3 by stopper screws 31, and the throttle valve 2 is inscribed in the intake passage 11 and is used for opening and closing intake air.
More specifically, the tip portion 32 of the throttle shaft 3 is supported by a holder 13 by a shaft hole 12 formed in the wall surface of the intake passage 11, and the base portion 33 of the throttle shaft 3 is pivotally supported by a cylindrical seal member 4 and a holder 5 as a bearing, the seal member 4 being disposed on the side (for example, the front surface side) opposite to the holder 13 of the intake passage 11, whereby the throttle shaft 3 is supported in a sealed state by the intake passage 11 so as to be smoothly rotatable.
In addition, in the housing 14 formed below the intake passage 11 of the throttle body 1, the motor-driven actuator 6 is housed in a housing recess 15 formed in the front surface of the housing 14 in a state in which a rotation shaft 61 thereof is exposed from the housing recess 15.
Further, a throttle gear 7 is fixed to a base end 33 of the throttle shaft 3 exposed from the recess 15 in the front surface of the throttle body 1, the throttle gear 7 has a circular arc plate-shaped gear portion 71, the gear portion 71 is engaged with a rotation gear 63 fixed to the rotation shaft 61 of the electric actuator 6 by a reduction gear 62, and a connecting rod 8 having a thin cylindrical shape is inserted between the holder 5 and the throttle gear 7 in the axial direction at the base end 33.
Further, the connecting rod 8 is formed with a locking projection 81, and when the opening degree of the throttle valve 2 is at a predetermined position, the locking projection 81 is locked to a locking projection 16 formed in the housing recess 15 of the throttle valve body 1, thereby restricting the throttle valve 2 from further rotating in the closing direction.
A return spring 9 is coupled between the front surface concave portion 15 of the throttle body 1 and the connecting rod 8, and a connecting rod spring 10 is coupled between the connecting rod 8 and the throttle gear 7, on the outer periphery of the throttle gear 7 at the base end portion 33 of the throttle shaft 3.
In particular, in the present embodiment, the rod spring 10 is embedded in and disposed in a recess 72 of the throttle gear 7 formed on the throttle body 1 side.
In the present embodiment, the load of the connecting rod spring 10 in the thrust direction is set to be larger than the load of the return spring 9 in the thrust direction due to the difference in spring constants, and the return spring 9 is set to be in a state of close contact-wound (or minute interval) at the time of assembly or in a state of close contact-wound (or minute interval) with the rotation operation of the throttle shaft 3, and the connecting rod 8 is set to be movable with the rotation operation.
As shown in fig. 3 and 4, in the present embodiment having the above-described configuration, the locking projection 81 of the connecting rod 8 is locked to the locking projection 16 of the throttle body 1, and the opening degree of the throttle valve 2 is set at a predetermined position such as at the time of idling, and at this time, the return spring 9 is in close contact with or in a state having a small interval. Further, since the link spring 10 is in a length state that exhibits the elastic force at the time of initial setting and the load of the link spring 10 in the thrust direction is set to be larger than the return spring 9, the link 8 is pressed to the holder 5 side by the load of the link spring 10 in the thrust direction.
When a throttle signal for operating the throttle valve 2 in the opening direction from the preset position is issued based on the operation of the driver, the electric actuator 6 is driven to transmit the driving force from the rotation shaft 61 to the throttle gear 7 through the reduction gear 62, so that the throttle shaft 3 is rotated in the direction for fully opening the throttle valve 2.
At this time, the return spring 9 provided between the throttle body 1 and the connecting rod 8 increases the number of turns and the adhesion height with the rotation of the connecting rod 8, thereby exerting the elastic force in the reverse direction.
Accordingly, as the load of the return spring 9 in the thrust direction increases, the return spring 9 exerts an elastic force so as to rotate the throttle shaft 3 in the direction to close the throttle valve 2, and by the return spring 9, the connecting rod 8 contracts against the load of the connecting rod spring 10 in the thrust direction, and moves away from the holder 5 in the base end direction of the throttle shaft 3.
When a signal for returning the throttle valve 2 to the preset position is transmitted to the electric actuator 6 again based on a travel stop operation or the like of the driver, the driving force from the electric actuator 6 is cut off, and the throttle valve shaft 3 is rotated in the direction for closing the throttle valve 2 to the preset position by the return force when the return spring 9 returns from the extended state to the original tightly wound state, but in the present embodiment, the connecting rod 8 and the return spring 9 are tightly attached to each other in the thrust direction by the load force of the connecting rod spring 10 in a proper low load state with respect to the return spring 9, so that the return spring 9 can be prevented from being damaged by resonance.
In the present embodiment, the connecting rod spring 10 is housed in the recess 72 formed in the throttle gear 7, and the length of the return spring 9 in the axial direction is shortened on the outer periphery of the throttle gear 7, so that miniaturization can be achieved, and a spring having a lower spring constant can be used as the return spring 9.
In addition, in the present embodiment, since a spring having a low spring constant is used as the return spring 9, as shown in fig. 5, even in the case of using a member having high compression resistance as the seal member 4, as compared with the above-described conventional example in fig. 6, there is no occurrence of an increase in torque of the seal member 4 in the opening direction and a decrease in torque in the closing direction, that is, the seal member 4 can be optimally set so as to achieve the following conditions: there is no case where the lifetime of the electric actuator 6 is reduced because the current of the electric actuator 6 increases with the torque of the throttle shaft 3 when the throttle valve 2 is operated in the opening direction; and no speed delay or return failure occurs when the throttle valve 2 is operated in the closing direction (return direction).
Claims (1)
1. An electronically controlled throttle device for an internal combustion engine, comprising:
the throttle body is provided with a valve body,
a throttle shaft pivotally supported by the throttle body and having a throttle valve,
a throttle gear fixed to a base end portion of the throttle shaft and configured to transmit a driving force in a direction of opening the throttle from an electric actuator disposed in the throttle body to the throttle shaft,
a connecting rod which is arranged between the throttle gear and the throttle body and is separated from the throttle gear in a mode of being rotatable in a prescribed range relative to the axial direction and being movable in the axial direction, wherein a locking protruding piece on the connecting rod is locked on the throttle body to limit rotation when in a preset state,
a return spring coupled between the connecting rod and the throttle body for returning the throttle body to a preset position when the driving force from the electric actuator is cut off,
a connecting rod spring connected between the connecting rod and the throttle gear; the electronically controlled throttle device of an internal combustion engine is characterized in that,
the return spring is disposed on an outer periphery of the connecting rod spring, and a load of the connecting rod spring in a thrust direction is set to be larger than a load of the return spring in the thrust direction, and when an opening degree of the throttle valve is at the preset position, the connecting rod is brought into a state of being pressed to a seat of the throttle shaft by the load of the connecting rod spring in the thrust direction,
when the throttle valve is rotated in a direction in which the throttle valve is fully opened in the axial direction, the return spring is brought into a state of being closely wound in accordance with the rotation operation of the throttle valve, the load of the return spring in the thrust direction is increased, the load of the return spring in the thrust direction is larger than the load of the connecting rod spring in the thrust direction, and the connecting rod resists the load of the connecting rod spring in the thrust direction by the return spring, so that the connecting rod moves in the direction of the base end of the throttle valve shaft.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-207489 | 2018-11-02 | ||
| JP2018207489A JP7260894B2 (en) | 2018-11-02 | 2018-11-02 | Electronic control throttle device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111140378A CN111140378A (en) | 2020-05-12 |
| CN111140378B true CN111140378B (en) | 2024-01-02 |
Family
ID=70463315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910964093.2A Active CN111140378B (en) | 2018-11-02 | 2019-10-11 | Electronic control throttle device for internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7260894B2 (en) |
| CN (1) | CN111140378B (en) |
| WO (1) | WO2020091063A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03271528A (en) * | 1990-03-22 | 1991-12-03 | Aisan Ind Co Ltd | Throttle valve control device |
| JP2006242197A (en) * | 2006-06-20 | 2006-09-14 | Aisan Ind Co Ltd | Throttle control device |
| JP2006312944A (en) * | 2006-08-28 | 2006-11-16 | Hitachi Ltd | Throttle device of internal combustion engine |
| JP2007218166A (en) * | 2006-02-16 | 2007-08-30 | Hitachi Ltd | Multiple electronic control throttle device |
| CN201474782U (en) * | 2009-09-01 | 2010-05-19 | 常州士林电机有限公司 | Electronic throttle valve structure |
| CN104379910A (en) * | 2013-06-03 | 2015-02-25 | 现代凯菲克株式会社 | Valve assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3271528B2 (en) | 1996-10-04 | 2002-04-02 | 日本鋼管株式会社 | Slag aggregate production equipment |
-
2018
- 2018-11-02 JP JP2018207489A patent/JP7260894B2/en active Active
-
2019
- 2019-10-11 CN CN201910964093.2A patent/CN111140378B/en active Active
- 2019-11-01 WO PCT/JP2019/043107 patent/WO2020091063A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03271528A (en) * | 1990-03-22 | 1991-12-03 | Aisan Ind Co Ltd | Throttle valve control device |
| JP2007218166A (en) * | 2006-02-16 | 2007-08-30 | Hitachi Ltd | Multiple electronic control throttle device |
| JP2006242197A (en) * | 2006-06-20 | 2006-09-14 | Aisan Ind Co Ltd | Throttle control device |
| JP2006312944A (en) * | 2006-08-28 | 2006-11-16 | Hitachi Ltd | Throttle device of internal combustion engine |
| CN201474782U (en) * | 2009-09-01 | 2010-05-19 | 常州士林电机有限公司 | Electronic throttle valve structure |
| CN104379910A (en) * | 2013-06-03 | 2015-02-25 | 现代凯菲克株式会社 | Valve assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020070791A (en) | 2020-05-07 |
| JP7260894B2 (en) | 2023-04-19 |
| CN111140378A (en) | 2020-05-12 |
| WO2020091063A1 (en) | 2020-05-07 |
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