CN204152579U - The variable valve device of internal-combustion engine - Google Patents
The variable valve device of internal-combustion engine Download PDFInfo
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- CN204152579U CN204152579U CN201420596520.9U CN201420596520U CN204152579U CN 204152579 U CN204152579 U CN 204152579U CN 201420596520 U CN201420596520 U CN 201420596520U CN 204152579 U CN204152579 U CN 204152579U
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Abstract
The utility model provides a kind of variable valve device of internal-combustion engine.The variable valve device of this internal-combustion engine possess the operating angle changing valve Control Shaft, make the external cam of this Control Shaft displacement and detect the angle transducer of angle of swing of this external cam, external cam is formed with alternating, for changing multiple maintaining segment of multiple reducer of the axial position of Control Shaft and the axial position for retentive control axle, it is fan-shaped that reducer is configured to the inequilateral that cam radius increases gradually along the circumference of this external cam; Maintaining segment is configured to constant equilateral fan-shaped of cam radius, and maintaining segment is more than three, and the angle intervals between two maintaining segment of a sandwich reducer is different from the angle intervals between two maintaining segment of another reducer of sandwich.Based on this structure, can without detecting the situation that sensed values deviate from actual value with omitting.
Description
Technical field
The utility model relates to a kind of variable valve device of internal-combustion engine, particularly a kind of variable valve device that can change the operating angle of valve.
Background technique
In prior art, there is the variable valve device of the operating angle of the valve that can change internal-combustion engine.Utilize For example, Patent Document 1 discloses a kind of external cam that the axial position of Control Shaft is changed, thus changed the variable valve device of the operating angle of valve by the axial position of Control Shaft.In above-mentioned external cam, be alternately formed with reducer and maintaining segment.Reducer is processed to, and the cam radius of external cam increases gradually along the circumferencial direction of external cam.By means of this reducer, Control Shaft moves vertically along with the rotation of external cam, thus the operating angle of valve can be made to change.Maintaining segment is processed to, and the cam radius of external cam remains unchanged.By means of this maintaining segment, even if external cam rotates, Control Shaft is also constant in the position of axis, thus the operating angle of valve can be made to remain unchanged.
But, in the above prior art, if only detect the angle of swing of above-mentioned external cam with an angle transducer, then the testing precision of the angle of swing of external cam likely cannot be guaranteed.Below, this is specifically described.
Fig. 5 is the schematic diagram of the external cam 300 of the example representing prior art, and in figure, upside represents the shape of external cam 300; In figure, left side represents determined by the shape of external cam 300, between angle of swing (angle of swing of external cam 300) and the operating angle of valve relation.As shown in Figure 5, cam 300 is formed with three fan-shaped reducers (x1, x2, x3) and three fan-shaped maintaining segment (y1, y2, y3).Three reducers (x1, x2, x3) are crossing with three maintaining segment (y1, y2, y3) alternately to be configured.Reducer x1 and maintaining segment y1 is adjacent; The 90 ° of ground that are separated by between maintaining segment y1 and maintaining segment y2 clip reducer x2; The 90 ° of ground that are separated by between maintaining segment y2 and maintaining segment y3 clip reducer x3.
Usually, due to the reason such as resistance variation, power supply voltage variation, between the output value (hereinafter referred to as sensed values) of angle transducer and the angle of swing (hereinafter referred to as actual value) of actual external cam, deviation can be produced.If this deviate is equal or close to the angle intervals between maintaining segment y1 and maintaining segment y2 and the angle intervals y3 between maintaining segment y2 and maintaining segment y3 (be 90 ° at this), is then difficult to discover between sensed values and actual value and there is deviation.Specifically, controlling electric current time in any one of three angle of swing intervals shown in actual value a, b, c is in Figure 50, if now sensed values is not in interval a, interval b or interval c, then illustrates that sensed values deviate from actual value.
Thus, sensed values during by judging that controlling electric current is 0, whether in interval a, interval b or interval c, can determine whether this sensed values deviate from actual value.But, if the deviation between sensed values and actual value is equal or close to the angle intervals between two maintaining segment (y1 and y2 or y2 and y3), if sensed values can in interval b when then actual value is in interval a; When actual value is in interval b, sensed values can in interval c, like this, under controlling state that electric current is 0, sensed values also in interval a, interval b or interval c, so sensed values can not be judged as deviate from actual value.Thus, in this case, the situation that sensed values deviate from actual value cannot be detected, its result, correctly can not change the operating angle of the valve of internal-combustion engine.
In order to avoid the problems referred to above occur, can consider to arrange double angle transducer, but can cost be increased again like this.
[patent documentation 1]: Japanese Unexamined Patent Publication 2014-105587 publication
Model utility content
For above-mentioned technical problem, the purpose of this utility model is, provides a kind of and can detect without omission the variable valve device that sensed values deviate from the internal-combustion engine of the situation of actual value.
As the technological scheme solved the problems of the technologies described above, the utility model provides a kind of variable valve device of internal-combustion engine.The variable valve device of this internal-combustion engine possess the operating angle changing valve Control Shaft, make the external cam of this Control Shaft displacement and detect the angle transducer of angle of swing of this external cam, described external cam is formed with alternating, for change the axial position of described Control Shaft multiple reducer and for keeping multiple maintaining segment of the axial position of described Control Shaft, it is fan-shaped that described reducer is configured to the inequilateral that cam radius increases gradually along the circumferencial direction of this external cam; Described maintaining segment is configured to constant equilateral fan-shaped of cam radius, it is characterized in that: described maintaining segment is more than three, the angle intervals between two described maintaining segment of a sandwich described reducer is different from the angle intervals between two described maintaining segment of sandwich reducer described in another.
The advantage with the variable valve device of the internal-combustion engine of the present utility model of said structure is, because maintaining segment is more than three, and the angle intervals between two maintaining segment of a sandwich reducer be different from another reducer of sandwich two maintaining segment between angle intervals, so, when deviate between the sensed values of angle transducer of angle of swing detecting this external cam and the actual value of the angle of swing of external cam is equal or close to angle intervals between certain two maintaining segment, because the angle intervals between two other maintaining segment is different from the deviation between above-mentioned sensed values and above-mentioned actual value, so in the operating range of two other maintaining segment, sensed values when there will not be control electric current to be 0 drops on the situation in the angle of swing interval of maintaining segment, thus, whether sensed values during by judging that controlling electric current is 0 is in the angle of swing interval of maintaining segment, the situation that sensed values deviate from actual value can be detected without omission.
In addition, in the variable valve device of above-mentioned internal-combustion engine of the present utility model, be preferably, the cam radius increment rate of the described reducer between two described maintaining segment that angle intervals is less is set, and is greater than the cam radius increment rate of the described reducer between two described maintaining segment that angle intervals is larger.
The advantage with the variable valve device of the internal-combustion engine of the present utility model of said structure is, because the cam radius increment rate of the reducer between two maintaining segment that angle intervals is less is set, be greater than the cam radius increment rate of the reducer between two maintaining segment that angle intervals is larger, namely, the cam radius increment rate of the reducer that fabric width is narrower is greater than the cam radius increment rate of the wider reducer of fabric width, so, in the operation interval of the narrower reducer of fabric width, Control Shaft displacement in the axial direction can close to Control Shaft displacement in the axial direction in the operation interval of the wider reducer of fabric width, thus the change of the operating angle of the valve in each reducer can be made impartial.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the Sketch of the variable valve device representing mode of execution.
Fig. 2 is the schematic diagram of the structure of the cam mechanism represented under suction valve closed condition.
Fig. 3 is the schematic diagram of the structure of the cam mechanism represented under inlet open state.
Fig. 4 is the schematic diagram of the shape of the external cam represented involved by mode of execution and the relation between the angle of swing of external cam determined by its shape and the working angle of suction valve.
Fig. 5 is the schematic diagram of the shape of the external cam representing prior art and the relation between the angle of swing of external cam determined by its shape and the working angle of suction valve.
Embodiment
Below, with reference to accompanying drawing, mode of execution of the present utility model is described.
Fig. 1 is the schematic diagram of the Sketch of the variable valve device 100 representing present embodiment.This variable valve device 100 is the variable valve devices of the motor (internal-combustion engine) possessing cylinder 60, piston 62, spark plug 64, suction valve 40 and outlet valve 50 etc.The variable valve device 100 of present embodiment is configured to, and the operating angle of the valve of suction valve 40 and valve stroke can change.In addition, variable valve device 100 also can be configured to, and the operating angle of the valve of outlet valve 50 and valve stroke can change.
Camshaft 22 rotates to the direction shown in the arrow A in Fig. 1 with the rotation of bent axle (not shown) with being connected.Camshaft 22 rotates and makes cam mechanism 20 action, thus drives suction valve 40 to open or close.Relevant cam mechanism 20 will be described later.
Actuator 10 moves vertically for making Control Shaft 228.Actuator 10 possesses external cam 11, pedestal 13 and motor 17.External cam 11 rotates centered by running shaft 12.Pedestal 13 is connected with Control Shaft 228 and can sliding axially on track 16 along Control Shaft 228.Motor 17 drives external cam 11 to rotate.Linked by reduction gear (not shown) between the output shaft of this motor 17 and the running shaft 12 of external cam 11.
Pedestal 13 is provided with cylinder 15.This cylinder 15 for by the Movement transmit of external cam 11 to pedestal 13.As described later, the elastic force of valve spring 42 acts on Control Shaft 228 by cam mechanism 20, and therefore, Control Shaft 228 is pushed to the left side in Fig. 1 always.Therefore, cylinder 15 abuts against with external cam 11 all the time.
In addition, in the present embodiment, external cam 11 has discontinuous cam profile as shown in Figure 1.The angle of swing of external cam 11 is limited in the scope in FIG shown in arrow B.
Electronic control unit (ECU) 30 is configured to the microcomputer with CPU, ROM and RAM etc.The output value of the shaft position sensor 26 that the output value of cam angle sensor 24 that accelerator open degree, engine revolution, cam mechanism 20 are arranged, Control Shaft 228 are arranged is input to electronic control unit 30.Electronic control unit 30 carries out the drived control of motor 17 according to these input values, becomes required value carry out system to the angle of swing of external cam 11 like that and drive to make the displacement amount of Control Shaft 228.
Fig. 2 and Fig. 3 is the schematic diagram of the structure representing cam mechanism 20.Fig. 2 illustrates the closed condition of suction valve 40; Fig. 3 illustrates the opening state of suction valve 40.Cam mechanism 20 in present embodiment possesses, and changes the operating angle of the valve of suction valve 40 and intermediary's driving mechanism 220 of valve stroke by the motion of transmitting camshaft 22 and cam 23.
Below, the action summary of cam mechanism 20 is described.Cam 23 abuts cylinder 225r, and when camshaft 22 rotates, cylinder 225r shakes centered by Control Shaft 228.In addition, cylinder 225r and protuberance 226n shakes integratedly.Along with the shake of cylinder 225r, protuberance 226n shakes centered by pitman arm shaft 227.Protuberance 226n abuts rocking arm 230.Corresponding to the shake of protuberance 226n, rocking arm 230 shakes centered by base end part 230c.The first end 230d of rocking arm 230 abuts the end of suction valve 40.Suction valve 40 is corresponding to the shake of rocking arm 230 and opening and closing.In addition, suction valve 40 is pushed to by the effect of the reaction force of valve spring 42 always and closes direction.In addition, cylinder 230a is supported by rocking arm 230, and the base end part 230c of rocking arm 230 is carry by clearance adjuster 230b.
Intermediary's driving mechanism 220 possesses, and changes the mechanism 226 of the angle formed between cylinder 225r and protuberance 226n along with Control Shaft 228 movement in the axial direction.Utilize this mechanism 226, operating angle and the valve stroke of the valve of suction valve 40 can be changed.Specifically, increase the angle formed between cylinder 225r and protuberance 226n, the operating angle of valve and valve stroke can be made to increase.On the contrary, reduce the angle formed between cylinder 225r and protuberance 226n, the operating angle of valve and valve stroke can be made to diminish.Because the mechanism 226 changing the angle formed between cylinder 225r and protuberance 226n belongs to prior art, thus at this, the description thereof will be omitted.
Below, external cam 11 is described.In Fig. 4, upside illustrates the cam profile of external cam 11; Left side illustrates determined by the shape of external cam 11, between angle of swing and the working angle of suction valve 40 relation.
As shown in Figure 4, external cam 11 is alternately formed with three reducers (X1, X2, X3) and three maintaining segment (Y1, Y2, Y3).
Each reducer (X1, X2, X3) is processed to, and the inequilateral that cam radius increases gradually along the circumferencial direction of external cam 11 is fan-shaped.These reducers (X1, X2, X3) are for changing the working angle of suction valve 40.Specifically, under the state that any one and cylinder 15 in these three reducers (X1, X2, X3) abut against, when external cam 11 rotates, pedestal 13 slides on track 16 along with the rotation of cam 11, thus, Control Shaft 228 displacement vertically, makes the operating angle of valve and valve stroke change.
Each maintaining segment (Y1, Y2, Y3) is processed to constant fan-shaped of cam radius.These maintaining segment (Y1, Y2, Y3) remain unchanged for making the working angle of suction valve 40.Specifically, under the state that any one and cylinder 15 in these three maintaining segment (Y1, Y2, Y3) abut against, even if external cam 11 rotates, pedestal 13 does not also move Move, thus, Control Shaft 228 invariant position in the axial direction, operating angle and the valve stroke of valve also do not change.
In prior art, as illustrated with Fig. 5, in the angle intervals equalization (being such as all 90 °) circumferentially of external cam 300 between maintaining segment y1, maintaining segment y2 and maintaining segment y3.Therefore, deviation between the output value (hereinafter referred to as sensed values) of angle transducer of angle of swing detecting external cam 300 and the angle of swing (hereinafter referred to as actual value) of actual external cam 300 is equal or close to angle intervals (being 90 ° in Figure 5) between maintaining segment y1, maintaining segment y2 and maintaining segment y3, the sensed values when situation that sensed values deviate from actual value cannot be 0 according to control electric current detects.
In order to solve this problem, in present embodiment, as described in Figure 4, in external cam 11 formed maintaining segment Y1, maintaining segment Y2 and maintaining segment Y3 unequal in the angle intervals circumferentially of external cam 11 each other.Specifically, the maintaining segment Y1 of sandwich reducer X2 and maintaining segment Y2 is configured to 50 ° in the angle intervals circumferentially of external cam 11; And the maintaining segment Y2 of sandwich reducer X3 and maintaining segment Y3 is set in 90 ° in the angle intervals circumferentially of external cam 11.In other words, the angle on two limits of the reducer X2 between maintaining segment Y1 and maintaining segment Y2 is 50 °; The angle on two limits of the reducer X3 between maintaining segment Y2 and maintaining segment Y3 is 90 °.
Based on this structure, when deviate between above-mentioned sensed values and above-mentioned actual value is equal or close to angle intervals between certain a pair maintaining segment (such as maintaining segment Y2 and maintaining segment Y3), this deviate can not be identical to the angle intervals between maintaining segment (such as maintaining segment Y1 and maintaining segment Y2) with another.Therefore, even if in the operation interval of a pair maintaining segment (such as maintaining segment Y2 and maintaining segment Y3), under the state that control electric current is 0, angle of swing interval (c) and failing that when being positioned at angle of swing interval (b) of maintaining segment because of actual value, sensed values is also positioned at maintaining segment detects the situation that sensed values departs from, at another in the operation interval of maintaining segment (such as maintaining segment Y1 and maintaining segment Y2), under control electric current is 0 state, when actual value is positioned at angle of swing interval (a) of maintaining segment, sensed values can not be positioned at angle of swing interval (b) of maintaining segment, thus departing from of sensed values can be detected.So, if control the sensed values of electric current when being 0 maintaining segment (Y1, Y2 or Y3) angle of swing interval (a, b or c) in, then can determine that sensed values does not depart from actual value; If control the sensed values of electric current when being 0 not maintaining segment (Y1, Y2 or Y3) angle of swing interval (a, b or c) in, then can determine that sensed values deviate from actual value.Like this, just can detect without omission the situation that sensed values deviate from actual value according to control electric current.
In addition, in the present embodiment, as shown in Figure 4, the cam radius increment rate of the reducer X2 between the less maintaining segment Y1 of angle intervals and maintaining segment Y2 is set, be greater than the reducer X3 cam radius increment rate between maintaining segment Y2 and the Y3 that angle intervals is larger, to make the working angle (A-B) corresponding to reducer X2 equal with the working angle (B-C) corresponding to reducer X3.So, the change of the operating angle of the valve in each reducer can be made impartial.
Above, present embodiment is illustrated, but the utility model is not limited to this mode of execution, the change be suitable for can be carried out.Such as, maintaining segment Y1 and maintaining segment Y2, angle intervals between maintaining segment Y2 and maintaining segment Y3 are not limited to 50 °, 90 °, can set arbitrarily according to actual conditions.In addition, maintaining segment also can be more than four, as long as make the angle intervals between maintaining segment unequal.
Claims (2)
1. the variable valve device of an internal-combustion engine, possess the Control Shaft of the operating angle changing valve, make the external cam of this Control Shaft displacement and detect the angle transducer of angle of swing of this external cam, described external cam is formed with alternating, for change the axial position of described Control Shaft multiple reducer and for keeping multiple maintaining segment of the axial position of described Control Shaft, it is fan-shaped that described reducer is configured to the inequilateral that cam radius increases gradually along the circumferencial direction of this external cam; Described maintaining segment is configured to constant equilateral fan-shaped of cam radius, it is characterized in that:
Described maintaining segment is more than three, and the angle intervals between two described maintaining segment of a sandwich described reducer is different from the angle intervals between two described maintaining segment of sandwich reducer described in another.
2. the variable valve device of internal-combustion engine as claimed in claim 1, is characterized in that:
The cam radius increment rate of the described reducer between two described maintaining segment that angle intervals is less is set, and is greater than the cam radius increment rate of the described reducer between two described maintaining segment that angle intervals is larger.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420596520.9U CN204152579U (en) | 2014-10-15 | 2014-10-15 | The variable valve device of internal-combustion engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420596520.9U CN204152579U (en) | 2014-10-15 | 2014-10-15 | The variable valve device of internal-combustion engine |
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| CN204152579U true CN204152579U (en) | 2015-02-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298582A (en) * | 2014-07-16 | 2016-02-03 | 丰田自动车株式会社 | Variable valve mechanism for internal combustion engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298582A (en) * | 2014-07-16 | 2016-02-03 | 丰田自动车株式会社 | Variable valve mechanism for internal combustion engine |
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