CN101666369B - Belt tensioning device of vehicle engine - Google Patents
Belt tensioning device of vehicle engine Download PDFInfo
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- CN101666369B CN101666369B CN200910057961.5A CN200910057961A CN101666369B CN 101666369 B CN101666369 B CN 101666369B CN 200910057961 A CN200910057961 A CN 200910057961A CN 101666369 B CN101666369 B CN 101666369B
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Abstract
The invention discloses a belt tensioning device of a vehicle engine. In order to eliminate or reduce the problems of belt creep and the like, the belt tensioning device comprises a base (1) and the like and is characterized by comprising a close cover (7), an elastic part and an asymmetric damping block (6), wherein one side of the close cover (7) facing to a cavity is provided with a convex pushing structure (12), the asymmetric damping block (6) is elastically connected with a pushing branch structure through the elastic part and is positioned between a circular wall (13-1) and the pushing branch structure, the outward side of the asymmetric damping block (6) is in an arc shape which coincides with the shape of the circular wall (13-1); and when the inward side of the asymmetric damping block (6) moves opposite to the side of the pushing branch structure adjacent to the asymmetric damping block (6), the distance between the inward side and the side is closer and closer or farther and farther. The invention has different positive damping and negative damping, and can eliminate or reduce the problems of belt creep and shake, large rocker vibration amplitude, engine vibration and noise, and the like.
Description
Technical field
The present invention relates to automobile technical field, particularly relate to a kind of belt stretcher of motor car engine.
Background technique
Drivign belt in motor car engine, when motor car engine is worked, in order, efficiently to rear class transferring energy, to make drivign belt keep good tension force, be that tension force remains in certain number range, tension force too large or too little to energy transmission, motor etc. is unfavorable.
In order to reach above-mentioned target, Hyundai Motor generally uses belt stretcher.Idle wheel compressing in belt stretcher is on drivign belt, and it carries out the adjusting of both direction: when belt occurs that tension force is too small, Idle wheel down direction presses down automatically, to keep tension force substantially constant; When overtension appears in belt, Idle wheel upward direction is lifted on automatically, to keep tension force substantially constant.
In order to reach good technique effect, belt stretcher inside is not only provided with torsion spring, is also provided with damping part, be belt stretcher depressing or lift Idle wheel, to keep tension force to keep in substantially constant process, the action of Idle wheel except being mainly subject to the major effect of torsion spring, be also subject to the impact of damping force.
The product of prior art, employing be symmetrical damping, i.e. the belt stretcher of motor car engine of the prior art, its Idle wheel is automatically keeping, is regulating in the process of drivign belt rate of tension, the damping of both direction is equally large, the defect of its existence is as follows.
1. if damping arranges greatlyr, by the problem there will be, be: when a. further depresses belt at belt resilience, Idle wheel, damping direction because with spring torque opposite direction, will consume too much spring torque, make belt tension inadequate, produce the noise skidding; B. may cause rocking arm and Idle wheel not to reply in time, belt and Idle wheel are thrown off, or belt slippage, or produce the noise of belt and Idle wheel beating, affect the life-span.
2. if damping arranges littlely, by the problem there will be, be: when belt presses to tension pulley, spring torque and damping sum are less, there will be the situations such as wheel train belt shake and rocking arm Oscillation Amplitude are larger, motor easily produces vibration and noise.
Summary of the invention
The belt stretcher of prior art, if damping arranges greatlyr, by the problem there will be, be: when a. further depresses belt at belt resilience, Idle wheel, damping direction because with spring torque opposite direction, too much spring torque will be consumed, make belt tension inadequate, produce the noise skidding; B. may cause belt and rocking arm not to reply in time, belt and Idle wheel are thrown off, or belt slippage, or produce the noise of belt and belt pulley beating, affect the life-span; If damping arranges littlely, by the problem there will be, be: when belt presses to tension pulley, spring torque and damping sum are less, there will be the situations such as wheel train belt shake and rocking arm Oscillation Amplitude are larger, motor easily produces vibration and noise.In order to solve the problems of the technologies described above, the present invention proposes following technological scheme.
1. a belt stretcher for motor car engine, comprises base, is arranged on the torsion spring in base, has the rocking arm of first end, the second end, central shaft, and Idle wheel, keeps predetermined torque power and the limit structure that limits rocking arm rotation angle;
Described torsion spring is involute shape, have two ends, one end thereof is inner end, be positioned in the middle of, its another for outer end, be positioned at outside; The second end of described Idle wheel and rocking arm is rotationally connected;
The outer end of torsion spring is connected with base; Central shaft, it is sequentially from top to bottom: be fixedly connected with base, be rotationally connected with rocking arm first end, be fixedly connected with capping; The inner end of torsion spring is connected with the first end of rocking arm; The second end of Idle wheel and rocking arm is rotationally connected;
Comprise: capping, elastic part, forward damping numerical value and the oppositely inconsistent asymmetric damping piece of damping numerical value; The quantity of asymmetric damping piece, the quantity of elastic part are more than two, and both quantity equates;
Described rocking arm first end is provided with round chamber, and the bottom of cavity is that the wall of disk, cavity is circular wall; Central shaft passes the bottom of cavity and is rotationally connected with rocking arm first end;
Capping is positioned at the round chamber place of rocking arm first end and is fixedly connected with the upper end of central shaft;
Capping is established bossed pushing structure towards the one side of cavity, and described pushing structure comprises promotion separation structure; It promoting the quantity of separation structure, and the quantity of asymmetric damping piece is consistent and its shape and structure is Rotational Symmetry;
Elastic part, its front end is connected with the rear portion of asymmetric damping piece, its rear end is connected with promotion separation structure, asymmetric damping piece by elastic part with promote separation structure and realize elasticity and be connected;
Described asymmetric damping piece is made by elastic material, and it is between circular wall and promotion separation structure; Each asymmetric damping piece, its upper and lower end face is plane, its side is outwardly circular arc and coincide with the shape of circular wall;
Asymmetric damping piece side inwardly, promotes the separation structure side adjacent with asymmetric damping piece, and these two sides have following a and b character:
A. it is relatively motionless that hypothesis promotes separation structure, when asymmetric damping piece is under the acting in conjunction of circular wall and elastic part, while relatively rotating towards a certain clockwise, between these two sides more and more closely, oppressive force is increasing;
B. it is relatively motionless that hypothesis promotes separation structure, when asymmetric damping piece is under the acting in conjunction of circular wall and elastic part, while relatively rotating towards a certain contrary clockwise, between these two sides more and more far, oppressive force is more and more less;
Above-mentioned a and b character are: when rocking arm generation a direction is rotated, what it was subject to is larger damping and increasing; Otherwise when rocking arm generation counter-rotation, what it was subject to is less damping and more and more less.
2. the pushing structure described in has four and promotes separation structure;
Described asymmetric damping piece is four; Each asymmetric damping piece, its upper and lower end face is that plane, its front portion are that microcephaly, rear portion are major part, its side is outwardly circular arc and coincide with the shape of circular wall, the arc of its side inwardly for caving in;
Asymmetric damping piece is between circular wall and promotion separation structure;
Each promotes separation structure, towards the outer side surface arc for protrude adjacent with asymmetric damping piece; Each promotes separation structure and all offers the backing structure of slotted eye being installed and being equipped with projection;
Described elastic part is spring sheet, and its quantity is four; Each spring sheet, it is the shape of bending, and its rear and low part is inserted in to be installed in slotted eye, and its front upper part is positioned at the front side of backing structure and offsets with the rear elastic of asymmetric damping piece.
3. the asymmetric damping piece described in, its upper and lower end face is plane, its side is outwardly circular arc and coincide with the shape of circular wall;
Asymmetric damping piece side inwardly, promotes the separation structure side adjacent with asymmetric damping piece, they be shaped as any one in following four:
A. the arc of asymmetric damping piece side inwardly for protruding, promotes the arc for depression towards outer side surface that separation structure is adjacent; Protrude arc, its front portion offsets with depression arc, its rear portion is separated with depression arc;
B. asymmetric damping piece side is inwardly the arc of depression, promotes the arc for protruding towards outer side surface that separation structure is adjacent; Depression arc, its front portion offsets with protrusion arc, its rear portion is separated with protrusion arc;
C. asymmetric damping piece side be inwardly plane, promote separation structure adjacent towards outer side surface, be plane; Plane inwardly, its front end with promote separation structure adjacent towards outerplanar offsets, its rear end is adjacent with promotion separation structure plane separation outwardly;
D. asymmetric damping piece, it is anterior for microcephaly, rear portion are major part, and its side is inwardly plane; What promotion separation structure was adjacent is plane towards outer side surface; The plane that asymmetric damping piece plane is inwardly adjacent with promoting separation structure, both are parallel and offset.
4. the asymmetric damping piece described in, its upper and lower end face is plane, its side is outwardly circular arc and coincide with the shape of circular wall; Asymmetric damping piece is side inwardly, and its central position is that excision is dodged at arc, its position, both sides of protruding.
5. the asymmetric damping piece described in, installation circular hole is offered at its position backwards; Described promotion separation structure is offered installation circular hole; Described elastic part is spring; The rear portion of spring is positioned at the installation circular hole that promotes separation structure, and its front portion is positioned at the installation circular hole of asymmetric damping piece, the rear portion of spring with promote that separation structure elasticity offsets, front portion and the asymmetric damping piece elasticity of spring offset.
6. the elastic part described in is spring sheet, and its front end is conflicted with the rear elastic of asymmetric damping piece, its rear portion is connected with promotion separation structure.
7. the central shaft described in, its axis place is hollow-core construction.
8. the outer end of the torsion spring described in is connected with base, and its connection refers to and is fixedly connected with or refers to that elbow structure formula connects; Described elbow structure formula connects the outer end that refers to torsion spring and is fabricated on elbow-shaped, base the structure that snaps in that can snap in elbow is set, and the outer end of elbow-shaped packs into and snaps in structure;
The inner end of described torsion spring is connected with the first end of rocking arm, and its connection refers to and is fixedly connected with or refers to that elbow structure formula connects; Described elbow structure formula connects and refers to that the inner end of torsion spring is fabricated to elbow-shaped, and the first end of rocking arm is provided with the structure that snaps in that can snap in elbow, and the inner end of torsion spring elbow-shaped packs into snapping in structure of rocking arm.
9. the belt stretcher described in has comprised interval and the interlayer sheet of the effect of reducing wear, and it is arranged between torsion spring and rocking arm, and all rotates and contact with rocking arm with torsion spring.
10. the limit structure described in is the first projection piece to be set on rocking arm, the second projection piece and the 3rd projection piece are set on base; Three projection pieces on same circular arc line and the first projection piece be arranged between other two projection pieces, in the situation that Idle wheel is not under pressure, the first projection piece and the second projection piece butt touch, in the situation that Idle wheel is subject to normal pressure, the first projection piece is positioned at the middle position of the second projection piece and the 3rd projection piece, in the situation that Idle wheel is subject to super large pressure, the first projection piece and the 3rd projection piece butt touch.
Beneficial effect of the present invention has proposed a kind of belt stretcher of asymmetric damping, that is: when the rate of tension of dynamo belt is increased by normal value trend or while becoming large by normal value, belt stretcher of the present invention regulates, keeps rate of tension in the scope of normal value with high damping state automatically; When the rate of tension of dynamo belt is reduced by normal value trend or while being diminished by normal value, belt stretcher of the present invention regulates, keeps rate of tension in the scope of normal value with low resistance state automatically.
Say further, the present invention also has following benefit:
In the situation that tensioning belt there is further tensioning; rocking arm still can flexible rotating in compared with the state of high damping, drive Idle wheel to lift, reduce and recover rate of tension; also can eliminate the problems such as wheel train belt shake, rocking arm Oscillation Amplitude are larger simultaneously, avoids or obviously reduce vibration and the noise of motor generation.
2. when the rate of tension of drivign belt is reduced by normal value trend or while being diminished by normal value, owing to being in the state of low resistance, Idle wheel can press down rapidly, make the rate of tension of belt be improved in time and recover under the drive of rocking arm.
3. when Idle wheel presses down belt, because be carries out under the condition of low resistance, so that spring torque consumes is little, and pressing action is timely rapidly, and belt does not produce and skids and the problem such as noise.
Accompanying drawing explanation
Fig. 1 is motor car engine belt stretcher schematic perspective view of the present invention, has made separating treatment in figure;
Fig. 2 is the plan view of motor car engine belt stretcher of the present invention;
Fig. 3 is the right elevation of Fig. 2;
Fig. 4 is the rear view of Fig. 2;
Fig. 5 is the plan view that a width is identical with Fig. 2 visual direction but has done the local processing of analysing and observe;
Fig. 6 is the left view of Fig. 2, has done the local processing of analysing and observe in figure;
Fig. 7 is one of central shaft, asymmetric damping piece, spring sheet, pushing structure, round chamber, the shape and structure of circular wall and schematic diagram of annexation;
Fig. 8 is the schematic perspective view of capping, and capping is established bossed pushing structure towards the one side of cavity, and pushing structure comprises four rotational symmetric separation structures of promotion;
Fig. 9 is one of schematic perspective view of asymmetric damping block;
Figure 10 be asymmetric damping block schematic perspective view two;
Figure 11 is the schematic perspective view of spring sheet;
Figure 12 is the schematic diagram that rocking arm first end is provided with round chamber, and the bottom of cavity is that the wall of disk, cavity is circular wall;
Figure 13 be asymmetric damping block, spring sheet, pushing structure, round chamber, circular wall shape and structure schematic diagram two;
Figure 14 be asymmetric damping block, spring sheet, pushing structure, round chamber, circular wall shape and structure schematic diagram three;
Figure 15 be asymmetric damping block, spring sheet, pushing structure, round chamber, circular wall shape and structure schematic diagram four;
Figure 16 be asymmetric damping block, spring sheet, pushing structure, round chamber, circular wall shape and structure schematic diagram five;
Figure 17 be asymmetric damping block, spring sheet, pushing structure, round chamber, circular wall shape and structure schematic diagram six;
Figure 18 is the schematic diagram in embodiment one;
Figure 19 is the schematic diagram of the first projection piece, the second projection piece and the 3rd projection piece, this figure can with Fig. 2 paired observation.
Label declaration in figure: the 1st, base; 1-1 is the second projection piece; 1-2 is the 3rd projection piece; The 2nd, torsion spring; The 3rd, central shaft; The 4th, interlayer sheet; The 5th, rocking arm; 5-1 is the first projection piece; 5-2 snaps in notch; The 6th, asymmetric damping block; The 7th, capping; The 9th, Idle wheel; The 10th, spring sheet; The 12nd, pushing structure; The 13rd, round chamber; 13-1 is circular wall; The 14th, spring; The 15th, generator; The 16th, runner; The 17th, belt stretcher; The 18th, runner; The 19th, motor; The 20th, belt; The 21st, driving pulley.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment
Below, first technological scheme of the present invention is carried out to overall description, introduction and explanation.
The belt stretcher of a kind of motor car engine of the present invention, as see Fig. 1 to Fig. 4, it comprises: base 1, be arranged on the torsion spring 2 in base 1, there is the Rocker arm 5 of first end, the second end, central shaft 3, Idle wheel 9, keeps predetermined torque power and the limit structure that limits Rocker arm 5 rotation angle; Described torsion spring 2 for involute shape, there are two ends, one end thereof is inner end, be positioned in the middle of, its another for outer end, be positioned at outside; Described Idle wheel 9 is rotationally connected with the second end of Rocker arm 5; The outer end of torsion spring 2 is connected with base 1; Central shaft 3, it is sequentially from top to bottom: be fixedly connected with base 1, be rotationally connected with Rocker arm 5 first end, be fixedly connected with capping 7; The inner end of torsion spring 2 is connected with the first end of Rocker arm 5; Idle wheel 9 is rotationally connected with the second end of Rocker arm 5.
In conjunction with Fig. 5 to Figure 12, describe (due to drawing length relation again, Figure 12 is reduced into 50% drafting): be distinguishedly, belt stretcher of the present invention also comprises: capping 7, elastic part, forward damping numerical value and the oppositely inconsistent asymmetric damping piece 6 of damping numerical value; The quantity of asymmetric damping piece 6, the quantity of elastic part are more than two, and both quantity equates; Described Rocker arm 5 first end is provided with round chamber 13, and the bottom of cavity is that the wall of disk, cavity is circular wall 13-1; Central shaft 3 passes the bottom of cavity and is rotationally connected with Rocker arm 5 first end; Capping 7 is positioned at round chamber 13 places of Rocker arm 5 first end and is fixedly connected with the upper end of central shaft 3; Capping 7 is established bossed pushing structure 12 towards the one side of cavity, and described pushing structure 12 comprises promotion separation structure; It promoting the quantity of separation structure, and the quantity of asymmetric damping piece 6 is consistent and its shape and structure is Rotational Symmetry; Elastic part, its front end is connected with the rear portion of asymmetric damping piece 6, its rear end is connected with promotion separation structure, asymmetric damping piece 6 by elastic part with promote separation structure and realize elasticity and be connected.
Described asymmetric damping piece 6 is made by elastic material, specifically makes the elastic material of asymmetric damping piece 6, can be nylon, plastics or specific rubber etc., and selection is wear resistance, robustness, rigidity and the flexibility that will consider material etc.
Following technical characteristics, in conjunction with Fig. 7, Figure 13, Figure 14, Figure 15, Figure 16 and Figure 17, describe and understand:
Asymmetric damping piece 6 is between circular wall 13-1 and promotion separation structure; Each asymmetric damping piece 6, its upper and lower end face is plane, its side is outwardly circular arc and coincide with the shape of circular wall 13-1;
Asymmetric damping piece 6 side inwardly, promotes the separation structure side adjacent with asymmetric damping piece 6, and these two sides have following a and b character:
A. it is relatively motionless that hypothesis promotes separation structure, when asymmetric damping piece 6 is under the acting in conjunction of circular wall 13-1 and elastic part, while relatively rotating towards a certain clockwise, between these two sides more and more closely, oppressive force is increasing;
B. it is relatively motionless that hypothesis promotes separation structure, when asymmetric damping piece 6 is under the acting in conjunction of circular wall 13-1 and elastic part, while relatively rotating towards a certain contrary clockwise, between these two sides more and more far, oppressive force is more and more less;
Above-mentioned a and b character are: when Rocker arm 5 generation a direction is rotated, what it was subject to is larger damping and increasing; Otherwise when Rocker arm 5 generation counter-rotation, what it was subject to is less damping and more and more less.
Technological scheme of the present invention is carried out to overall description, introduction and explanation above.Below each further technological scheme of the present invention is described, is introduced and illustrates.
Further technological scheme 1.
In conjunction with Fig. 5 to Figure 12, be described and understand.
Described pushing structure 12 has four and promotes separation structure; Described asymmetric damping piece 6 is four; Each asymmetric damping piece 6, its upper and lower end face is that plane, its front portion are that microcephaly, rear portion are major part, its side is outwardly circular arc and coincide with the shape of circular wall 13-1, the arc of its side inwardly for caving in; Asymmetric damping piece 6 is between circular wall 13-1 and promotion separation structure; Each promotes separation structure, towards the outer side surface arc for protrude adjacent with asymmetric damping piece 6; Each promotes separation structure and all offers the backing structure of slotted eye being installed and being equipped with projection; Described elastic part is spring sheet 10, and its quantity is four; Each spring sheet 10, it is the shape of bending, and its rear and low part is inserted in to be installed in slotted eye, and its front upper part is positioned at the front side of backing structure and offsets with the rear elastic of asymmetric damping piece 6.Spring sheet 10 can be to insert to install in slotted eye, can also be with powerful viscose glue, to be adhesively fixed afterwards in inserting installation slotted eye again.
Above-mentioned spring sheet 10 also can be described as spring sheet, and it has good elastic performance.
Further technological scheme 2.
In conjunction with Figure 13 to Figure 15, be described and understand.
Described asymmetric damping piece (6), its upper and lower end face is plane, its side is outwardly circular arc and coincide with the shape of circular wall (13-1);
Described asymmetric damping piece (6) side inwardly, the side that described promotion separation structure is adjacent with asymmetric damping piece (6), they be shaped as any one in following four:
A. the arc of asymmetric damping piece (6) side inwardly for protruding, promotes the arc for depression towards outer side surface that separation structure is adjacent; Protrude arc, its front portion offsets with depression arc, its rear portion is separated with depression arc.The technical characteristics of this part can be understood referring to Figure 13, Figure 15.
B. asymmetric damping piece (6) side is inwardly the arc of depression, promotes the arc for protruding towards outer side surface that separation structure is adjacent; Depression arc, its front portion offsets with protrusion arc, its rear portion is separated with protrusion arc.The technical characteristics of this b part can be understood referring to Fig. 7, Figure 14.Wherein, it is arc, promotion separation structure adjacent towards the outer side surface arc for depression of asymmetric damping block (6) side inwardly for protruding that Figure 14 seems, but after examining and analyzing, can learn: the shape effectively also really working or asymmetric damping piece (6) side are inwardly the arc of depression, promote the arc for protrusion towards outer side surface that separation structure is adjacent; Depression arc, its front portion offsets with protrusion arc, its rear portion is separated with protrusion arc.
C. asymmetric damping piece (6) side be inwardly plane, promote separation structure adjacent towards outer side surface, be plane; Plane inwardly, its front end with promote separation structure adjacent towards outerplanar offsets, its rear end is adjacent with promotion separation structure plane separation outwardly.The technical characteristics of this c part can be understood referring to Figure 17.
D. asymmetric damping piece (6), it is anterior for microcephaly, rear portion are major part, and its side is inwardly plane; What promotion separation structure was adjacent is plane towards outer side surface; The plane that asymmetric damping piece (6) plane is inwardly adjacent with promoting separation structure, both are parallel and offset.The technical characteristics of this d part can be understood referring to Figure 16.
Further technological scheme 3.
Described asymmetric damping piece 6, its upper and lower end face is plane, its side is outwardly circular arc and coincide with the shape of circular wall 13-1; Asymmetric damping piece 6 is side inwardly, and its central position is that excision is dodged at arc, its position, both sides of protruding.The technical program can be understood referring to Figure 15.
Further technological scheme 4.
Described asymmetric damping piece 6, installation circular hole is offered at its position backwards; Described promotion separation structure is offered installation circular hole; Described elastic part is spring 14; The rear portion of spring 14 is positioned at the installation circular hole that promotes separation structure, and its front portion is positioned at the installation circular hole of asymmetric damping piece 6, the rear portion of spring 14 with promote that separation structure elasticity offsets, front portion and asymmetric damping piece 6 elasticity of spring 14 offset.The technical program can be understood referring to Figure 13.
Further technological scheme 5.
Described elastic part is spring sheet 10, and its front end is conflicted with the rear elastic of asymmetric damping piece 6, its rear portion is connected with promotion separation structure.The technical program can be understood referring to Fig. 7, Figure 14, Figure 15, Figure 16, Figure 17.
Further technological scheme 6.
Described central shaft 3, its axis place is hollow-core construction.The technical program is compared with the central shaft 3 of solid construction, and cost is low, easy to process, as long as exert pressure, allows the two ends of hollow-core construction central shaft 3 be dilatating and deformable, just can make base 1, capping 7 be fixedly connected with.
Further technological scheme 7.
The outer end of described torsion spring 2 is connected with base 1, and its connection refers to and is fixedly connected with or refers to that elbow structure formula connects; Described elbow structure formula connects the outer end that refers to torsion spring 2 and is fabricated on elbow-shaped, base 1 structure that snaps in that can snap in elbow is set, and the outer end of elbow-shaped packs into and snaps in structure; The described inner end of torsion spring 2 and the first end of Rocker arm 5 are connected, and its connection refers to and is fixedly connected with or refers to that elbow structure formula connects; Described elbow structure formula connects and refers to that the inner end of torsion spring 2 is fabricated to elbow-shaped, and the first end of Rocker arm 5 is provided with the structure that snaps in that can snap in elbow, and the inner end of torsion spring 2 elbow-shaped packs into snapping in structure of Rocker arm 5.
" being fixedly connected with " in above-mentioned word can be to be screwed connection, riveted joint or other fixation method to connect.
" connection of elbow structure formula " in above-mentioned word, can understand referring to Fig. 1 and Figure 12.As shown in Figure 1: the outer end of torsion spring 2 is fabricated to elbow-shaped and snaps on base 1 upper process piece; As shown in Fig. 1 and Figure 12: in Fig. 1, the inner end of torsion spring 2 is fabricated to elbow-shaped and inserts snapping in notch 5-2(and should snapping in notch 5-2 as shown in Figure 12 of Rocker arm 5).Because torsion spring 2 has been preset the torque force shrinking, after snapping in, the outer end of torsion spring 2, inner end can not fall down under the effect of torque force, fixed firmly.
Further technological scheme 8.
Described belt stretcher has comprised interval and the interlayer sheet 4 of the effect of reducing wear, and it is arranged between torsion spring 2 and Rocker arm 5, and all rotates and contact with Rocker arm 5 with torsion spring 2.
The technical program can be understood referring to Fig. 1.
Further technological scheme 9.
Described limit structure is the first projection piece 5-1 to be set on Rocker arm 5, the second projection piece 1-1 and the 3rd projection piece 1-2 are set on base 1; Three projection pieces on same circular arc line and the first projection piece 5-1 be arranged between other two projection pieces, in the situation that Idle wheel 9 is not under pressure, the first projection piece 5-1 and the second projection piece 1-1 butt touch, in the situation that Idle wheel 9 is subject to normal pressure, the first projection piece 5-1 is positioned at the middle position of the second projection piece 1-1 and the 3rd projection piece 1-2, in the situation that Idle wheel 9 is subject to super large pressure, the first projection piece 5-1 and the 3rd projection piece 1-2 butt touch.
The technical program can be understood referring to Fig. 2 and Figure 19.
As shown in Figure 2, in the situation that Idle wheel 9 is not under pressure, due to the effect of torsion spring 2, the left side of the right side of the first projection piece 5-1 and the second projection piece 1-1 is inconsistent.
In the situation that Idle wheel 9 is subject to increasing pressure, a part of torque force of torsion spring 2 is overcome, Idle wheel 9 moves right and drives Rocker arm 5 rotation, Rocker arm 5 to rotate and drives again the first projection piece 5-1 to depart from the second projection piece 1-1 conflict, also turn left counterclockwise.In said process, base 1 is fixed motionless.
When factory inspection, if Idle wheel 9 is continued to apply larger pressure, the torque force being overcome is more; Rocker arm 5 is rotated further; until the right side of the left side of the first projection piece 5-1 and the 3rd projection piece 1-2 is inconsistent, as shown in figure 19, Rocker arm 5 has also just stopped rotation.
Embodiment one
In conjunction with Fig. 1 to Fig. 8, and Figure 18, totally 9 width figure describe.Fig. 1 is motor car engine belt stretcher schematic perspective view of the present invention, has made separating treatment in figure; Fig. 2 is the plan view of motor car engine belt stretcher of the present invention; Fig. 3 is the right elevation of Fig. 2; Fig. 4 is the rear view of Fig. 2; Fig. 5 is the plan view that a width is identical with Fig. 2 visual direction but has done the local processing of analysing and observe; Fig. 6 is the left view of Fig. 2, has done the local processing of analysing and observe in figure; Fig. 7 is one of central shaft, asymmetric damping piece, spring sheet, pushing structure, round chamber, the shape and structure of circular wall and schematic diagram of annexation; Fig. 8 is the schematic perspective view of capping, and capping is established bossed pushing structure towards the one side of cavity, and pushing structure comprises four rotational symmetric separation structures of promotion; Figure 18 is the schematic diagram in the present embodiment one;
As schematically shown in Figure 18, the output shaft of motor 19 drives driving pulley 21 to rotate, and driving pulley 21 drives generator 15 to rotate by drivign belt 20, thereby mechanical energy is changed into electric energy, makes generator output current, to storage battery charging and for automobile lighting etc.In figure, the belt stretcher 17 of motor car engine of the present invention, by support, be fixedly connected with (more specifically: be that base 1 is fixedly connected with motor 19 by support) with motor 19, the Idle wheel 9 on belt stretcher 17 is pressed on drivign belt 20.
Above mechanical structure can make the tension force of drivign belt 20 remain in a suitable number range automatically; That is: when overtension, Rocker arm 5 take the axis of central shaft 3 as the center of circle, automatic rotating in the direction of the clock, thereby lift Idle wheel 9, reduced the tension force of belt 20, the tension force on belt 20 is remained in range of normal value; Otherwise when tension force is too small, Rocker arm 5 be take the axis of central shaft 3 as the center of circle, by counter clockwise direction automatic rotating, thereby further press down Idle wheel 9, improved the tension force of belt 20, the tension force on belt 20 is remained in range of normal value.In course of action described above, Rocker arm 5 rotates but base 1 does not rotate.
In belt stretcher 17 of the present invention, torsion spring 2 is arranged in base 1, and it is involute shape, and its outer end that is positioned at outside left is fixedly connected with base 1, and it is positioned at the inner end of intermediate portion and the first end of Rocker arm 5 is fixedly connected with.Belt stretcher 17 is after assembling completion, or said before being installed on motor 19, its torsion spring 2 has been preset torque force, in order to prevent that torsion spring 2 resiliences, in other words in order to keep torque force default on torsion spring 2 constant, are also provided with limit structure in device.Limit structure effect has two: the one, before belt stretcher 17 is installed on motor 19, keep torque force default on torsion spring 2 constant, the 2nd, after belt stretcher 17 is installed on motor 19, the slewing area of Rocker arm 5 is construed as limiting, is that Rocker arm 5 only allows to rotate, thereby stipulated the extreme lower position that Idle wheel 9 is depressed and the extreme higher position of lifting in certain angular range.
Central shaft (3, its lower end is fixedly connected with base 1, its top is fixedly connected with capping 7, so both kept base 1 and capping 7 can not split away off, kept again relative rotation can occurring between base 1 and capping 7, between pushing structure and base 1, also relative rotation can not occur thus.
Central shaft 3 is rotationally connected with the first end of Rocker arm 5, this both being rotationally connected can be being rotationally connected of contact-type, as Rocker arm 5 first end, central authorities are provided with rotation hole, and central shaft 3 is through in rotation hole, has direct contact between the two, or have bearing between the two, have a mediate contact between the two;
Central shaft 3 is rotationally connected with the first end of Rocker arm 5, this both being rotationally connected can also be contactless being rotationally connected, as Rocker arm 5 first end, central authorities are provided with the rotation hole that diameter is larger, central shaft 3 is through in rotation hole, and do not use bearing, so, this both being rotationally connected is exactly contactless being rotationally connected, and not only not directly contact, but also there is no mediate contact.
When belt stretcher 17 is installed on motor 19, Idle wheel 9 is pressed on belt 20 and after all assembling and setting completes, tension force on Idle wheel 9 meets the requirements, now compare with the situation before installation, the inner end of Rocker arm 5 and torsion spring 2 has rotated certain angle (rotation said is relative and base) here.
In general, for on being installed to motor 19 and debugged for qualified belt stretcher 17, when motor 19 remains static; the position of Rocker arm 5; neither in allowed lower position, also not at allowed upper limit position, but better in middle position, when motor 19 work; automatically keep for tension force, two-way all have a larger regulation range.
Upper limit position and lower position rely on limit structure to realize.For limit structure, face before describing the present embodiment, is further doing detailed introduction in technological scheme, and just it is no longer repeated here.
When engine operation is moved, if there is belt 20 tension force, diminish, the Rocker arm 5 that now torsion spring 2 discharges in torque force, Figure 18 rotates counterclockwise and drives Idle wheel 9 to press down, thereby makes the tension force on belt 20 strengthen and keep within the limits prescribed; If there is belt 20 tension force, become large, the Rocker arm 5 that now torsion spring 2 is increased in torque force, Figure 18 clockwise rotates and drives Idle wheel 9 to lift, thereby makes the tension force on belt 20 reduce and keep within the limits prescribed.More concretely, the adjusting moment of mentioned strain, promote the strength that rocking arm rotates, mainly belt 20 tension force that changed and the torque force of torsion spring 2, in addition from the more analysis of refinement, the asymmetric damping of using asymmetric damping piece and producing has also affected regulating effect in moment, and the asymmetric damping component that the present invention uses, its effect feature is: when belt 20 tension force are diminished by normal value, while needing Idle wheel 9 to press down, Rocker arm 5 rotates counterclockwise and regulates the damping being subject to little, can rotate rapidly Rocker arm 5 like this, belt 20 tension force are improved rapidly, when belt 20 tension force become large by normal value, the damping being subject to is large, and the tension force newly increasing like this will be smaller.
For the further situation asymmetric damping, make clear, in conjunction with Fig. 5, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11 and Figure 12, describe and explain now.
Fig. 5 has done the local processing of analysing and observe in the plan view, figure of motor car engine belt stretcher of the present invention; Fig. 7 is central shaft, asymmetric damping piece, spring sheet, pushing structure, round chamber, the shape and structure of circular wall and the schematic diagram of annexation; Fig. 8 is the schematic perspective view of capping, and capping is established bossed pushing structure towards the one side of cavity, and pushing structure comprises four rotational symmetric separation structures of promotion; Fig. 9 is one of schematic perspective view of asymmetric damping block; Figure 10 be asymmetric damping block schematic perspective view two; Figure 11 is the schematic perspective view of spring sheet; Figure 12 is the schematic diagram that rocking arm first end is provided with round chamber, and the bottom of cavity is that the wall of disk, cavity is circular wall (due to drawing length relation, Figure 12 is reduced into 50% drafting).
In Fig. 8, have the capping 7 of projection pushing structure 12, its pushing structure comprises four rotational symmetric separation structures of promotion.These capping 7 parts are aluminum alloy material, use one-time formed extrusion process manufacture, i.e. capping and pushing structure above thereof are fabricated to one.
As shown in Figure 5, asymmetric damping piece 6 is four; Each asymmetric damping piece 6, its upper and lower end face is that plane, its front portion are that microcephaly, rear portion are major part, its side is outwardly circular arc and coincide with the shape of circular wall 13-1, the arc of its side inwardly for caving in; Asymmetric damping piece 6 is between circular wall 13-1 and promotion separation structure; Each promotes separation structure, towards the outer side surface arc for protrude adjacent with asymmetric damping piece 6; Each promotes separation structure and all offers the backing structure of slotted eye being installed and being equipped with projection; Described elastic part is spring sheet 10, and its quantity is four; Each spring sheet 10, it is the shape of bending, and its rear and low part is inserted in to be installed in slotted eye, and its front upper part is positioned at the front side of backing structure and offsets with the rear elastic of asymmetric damping piece 6.Spring sheet 10 can be to insert to install in slotted eye, can also be with powerful viscose glue, to be adhesively fixed afterwards in inserting installation slotted eye again.
When the tension force of belt 20 diminishes, base 1 is motionless, the pushing structure 12 of capping 7 and projection thereof is also motionless; Rocker arm 5 be take the axis of central shaft 3 and rotated counterclockwise as the center of circle; be equivalent to circular wall 13-1 and rotate counterclockwise, at spring sheet 10 and promote, under the acting in conjunction of separation structure, can find out: asymmetric damping piece (6) side inwardly; promote the separation structure side adjacent with asymmetric damping piece (6), between these two sides more and more far, oppressive force is more and more less; The asymmetric damping piece (6) that now circular wall 13-1 is subject to be less damping and more and more less.
When the tension force of belt 20 becomes, base 1 is motionless, the pushing structure 12 of capping 7 and projection thereof is also motionless; Rocker arm 5 be take the axis of central shaft 3 and clockwise rotated as the center of circle; be equivalent to circular wall 13-1 and clockwise rotate, at spring sheet 10 and promote, under the acting in conjunction of separation structure, can find out: asymmetric damping piece (6) side inwardly; promote the separation structure side adjacent with asymmetric damping piece (6), more and more tightr between these two sides, oppressive force is increasing; The asymmetric damping piece (6) that now circular wall 13-1 is subject to be larger damping and increasing.
In sum, in the present invention, when motor drivign belt 20 compresses Idle wheel, tension pulley 9 can provide higher damping; When motor drivign belt 20 unclamps Idle wheel 9, the damping of tension pulley is less.Its benefit is: 1. in belt 20 tensionings, occur compared with high damping in the situation that, Rocker arm 5 still can flexible rotating, and can eliminate the problems such as wheel train belt shake, Rocker arm 5 Oscillation Amplitude are larger, avoids motor to produce vibration and noise; 2. the moment of unclamping at belt 20 and Idle wheel 9, Rocker arm 5 can be replied rapidly tightening belt 20.3. the moment of unclamping when the relative Idle wheel 9 of belt 20, because damping is little, the torque consumption of torsion spring 2 is little, and the time compole of moment is short, tension force is exceedingly fast and returns to normal value, so belt 20 does not produce, does not skid and the problem such as noise.
Claims (10)
1. the belt stretcher of a motor car engine, comprise base (1), be arranged on the torsion spring (2) in base (1), the rocking arm (5) with first end, the second end, central shaft (3), Idle wheel (9), keeps predetermined torque power and the limit structure that limits rocking arm (5) rotation angle;
Described torsion spring (2) is involute shape, has two ends, one end thereof is inner end, be positioned in the middle of, its another for outer end, be positioned at outside; Described Idle wheel (9) is rotationally connected with the second end of rocking arm (5);
The outer end of torsion spring (2) is connected with base (1); Central shaft (3), it is sequentially from top to bottom: be fixedly connected with base (1), be rotationally connected with rocking arm (5) first end, be fixedly connected with capping (7); The inner end of torsion spring (2) is connected with the first end of rocking arm (5); Idle wheel (9) is rotationally connected with the second end of rocking arm (5);
It is characterized in that:
Comprise: capping (7), elastic part, forward damping numerical value and the oppositely inconsistent asymmetric damping piece of damping numerical value (6); The quantity of asymmetric damping piece (6), the quantity of elastic part are more than two, and both quantity equates;
Described rocking arm (5) first end is provided with round chamber (13), and the bottom of cavity is that the wall of disk, cavity is circular wall (13-1); Central shaft (3) passes the bottom of cavity and is rotationally connected with rocking arm (5) first end;
Capping (7) is positioned at the round chamber (13) of rocking arm (5) first end and locates and be fixedly connected with the upper end of central shaft (3);
Capping (7) is established bossed pushing structure (12) towards the one side of cavity, and described pushing structure (12) comprises promotion separation structure; Promote the quantity of separation structure and the quantity of asymmetric damping piece (6) is consistent and its shape and structure is Rotational Symmetry;
Elastic part, its front end is connected with the rear portion of asymmetric damping piece (6), its rear end is connected with promotion separation structure, asymmetric damping piece (6) by elastic part with promote separation structure and realize elasticity and be connected;
Described asymmetric damping piece (6) is made by elastic material, and it is positioned at circular wall (13-1) and promotes between separation structure; Each asymmetric damping piece (6), its upper and lower end face is plane, its side is outwardly circular arc and coincide with the shape of circular wall (13-1);
Asymmetric damping piece (6) side inwardly, promotes the separation structure side adjacent with asymmetric damping piece (6), and these two sides have following a and b character:
A. it is relatively motionless that hypothesis promotes separation structure, when asymmetric damping piece (6) is under the acting in conjunction of circular wall (13-1) and elastic part, while relatively rotating towards a certain clockwise, between these two sides more and more closely, oppressive force is increasing;
B. it is relatively motionless that hypothesis promotes separation structure, when asymmetric damping piece (6) is under the acting in conjunction of circular wall (13-1) and elastic part, while relatively rotating towards a certain contrary clockwise, between these two sides more and more far, oppressive force is more and more less;
Above-mentioned a and b character are: when a direction rotation occurs rocking arm (5), what it was subject to is larger damping and increasing; Otherwise when counter-rotation occurs rocking arm (5), what it was subject to is less damping and more and more less.
2. the belt stretcher of a kind of motor car engine according to claim 1, is characterized in that:
Described pushing structure (12) has four and promotes separation structure;
Described asymmetric damping piece (6) is four; Each asymmetric damping piece (6), its upper and lower end face is that plane, its front portion are that microcephaly, rear portion are major part, its side is outwardly circular arc and coincide with the shape of circular wall (13-1), the arc of its side inwardly for caving in;
Asymmetric damping piece (6) is positioned at circular wall (13-1) and promotes between separation structure;
Each promotes separation structure, towards the outer side surface arc for protrude adjacent with asymmetric damping piece (6); Each promotes separation structure and all offers the backing structure of slotted eye being installed and being equipped with projection;
Described elastic part is spring sheet (10), and its quantity is four; Each spring sheet (10), it is the shape of bending, and its rear and low part is inserted in to be installed in slotted eye, and its front upper part is positioned at the front side of backing structure and offsets with the rear elastic of asymmetric damping piece (6).
3. the belt stretcher of a kind of motor car engine according to claim 1, is characterized in that:
Described asymmetric damping piece (6), its upper and lower end face is plane, its side is outwardly circular arc and coincide with the shape of circular wall (13-1);
Asymmetric damping piece (6) side inwardly, promotes the separation structure side adjacent with asymmetric damping piece (6), they be shaped as any one in following four:
A. the arc of asymmetric damping piece (6) side inwardly for protruding, promotes the arc for depression towards outer side surface that separation structure is adjacent; Protrude arc, its front portion offsets with depression arc, its rear portion is separated with depression arc;
B. asymmetric damping piece (6) side is inwardly the arc of depression, promotes the arc for protruding towards outer side surface that separation structure is adjacent; Depression arc, its front portion offsets with protrusion arc, its rear portion is separated with protrusion arc;
C. asymmetric damping piece (6) side be inwardly plane, promote separation structure adjacent towards outer side surface, be plane; Plane inwardly, its front end with promote separation structure adjacent towards outerplanar offsets, its rear end is adjacent with promotion separation structure plane separation outwardly;
D. asymmetric damping piece (6), it is anterior for microcephaly, rear portion are major part, and its side is inwardly plane; What promotion separation structure was adjacent is plane towards outer side surface; The plane that asymmetric damping piece (6) plane is inwardly adjacent with promoting separation structure, both are parallel and offset.
4. the belt stretcher of a kind of motor car engine according to claim 1, is characterized in that:
Described asymmetric damping piece (6), its upper and lower end face is plane, its side is outwardly circular arc and coincide with the shape of circular wall (13-1); Asymmetric damping piece (6) is side inwardly, and its central position is that excision is dodged at arc, its position, both sides of protruding.
5. the belt stretcher of a kind of motor car engine according to claim 1, is characterized in that:
Described asymmetric damping piece (6), installation circular hole is offered at its position backwards; Described promotion separation structure is offered installation circular hole; Described elastic part is spring (14); The rear portion of spring (14) is positioned at the installation circular hole that promotes separation structure, its front portion is positioned at the installation circular hole of asymmetric damping piece (6), the rear portion of spring (14) with promote that separation structure elasticity offsets, front portion and asymmetric damping piece (6) elasticity of spring (14) offset.
6. the belt stretcher of a kind of motor car engine according to claim 1, is characterized in that: described elastic part is spring sheet (10), and its front end is conflicted with the rear elastic of asymmetric damping piece (6), its rear portion is connected with promotion separation structure.
7. the belt stretcher of a kind of motor car engine according to claim 1, is characterized in that: described central shaft (3), its axis place is hollow-core construction.
8. the belt stretcher of a kind of motor car engine according to claim 1, is characterized in that:
The outer end of described torsion spring (2) is connected with base (1), and its connection refers to and is fixedly connected with or refers to that elbow structure formula connects; Described elbow structure formula connects the outer end that refers to torsion spring (2) and is fabricated on elbow-shaped, base (1) structure that snaps in that can snap in elbow is set, and the outer end of elbow-shaped packs into and snaps in structure;
The inner end of described torsion spring (2) is connected with the first end of rocking arm (5), and its connection refers to and is fixedly connected with or refers to that elbow structure formula connects; Described elbow structure formula connects and refers to that the inner end of torsion spring (2) is fabricated to elbow-shaped, and the first end of rocking arm (5) is provided with the structure that snaps in that can snap in elbow, and the inner end of torsion spring (2) elbow-shaped packs into snapping in structure of rocking arm (5).
9. the belt stretcher of a kind of motor car engine according to claim 1, it is characterized in that: described belt stretcher has comprised interval and the interlayer sheet (4) of the effect of reducing wear, it is arranged between torsion spring (2) and rocking arm (5), and all rotates and contact with rocking arm (5) with torsion spring (2).
10. the belt stretcher of a kind of motor car engine according to claim 1, is characterized in that: described limit structure is the first projection piece (5-1) to be set on rocking arm (5), the second projection piece (1-1) and the 3rd projection piece (1-2) are set on base (1); Three projection pieces on same circular arc line and the first projection piece (5-1) be arranged between other two projection pieces, in the situation that Idle wheel (9) is not under pressure, the first projection piece (5-1) touches with the second projection piece (1-1) butt, in the situation that Idle wheel (9) is subject to normal pressure, the first projection piece (5-1) is positioned at the middle position of the second projection piece (1-1) and the 3rd projection piece (1-2), in the situation that Idle wheel (9) is subject to super large pressure, the first projection piece (5-1) touches with the 3rd projection piece (1-2) butt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910057961.5A CN101666369B (en) | 2009-09-28 | 2009-09-28 | Belt tensioning device of vehicle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910057961.5A CN101666369B (en) | 2009-09-28 | 2009-09-28 | Belt tensioning device of vehicle engine |
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| Publication Number | Publication Date |
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| CN101666369A CN101666369A (en) | 2010-03-10 |
| CN101666369B true CN101666369B (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910057961.5A Active CN101666369B (en) | 2009-09-28 | 2009-09-28 | Belt tensioning device of vehicle engine |
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| CN (1) | CN101666369B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150100686A (en) | 2012-12-26 | 2015-09-02 | 리텐스 오토모티브 파트너쉽 | Orbital tensioner assembly |
| CN103423392B (en) * | 2013-08-09 | 2015-11-18 | 宁波丰茂远东橡胶有限公司 | With the Idle wheel of asymmetric damping mechanism |
| CN104047985B (en) * | 2014-06-03 | 2018-08-24 | 上海贝序汽车科技有限公司 | Damping unit for stretcher |
| CN104048006B (en) * | 2014-06-03 | 2018-03-27 | 上海贝序汽车科技有限公司 | A kind of damping unit for being used in stretcher and a kind of damping device for being used in stretcher |
| US10520066B2 (en) | 2014-06-26 | 2019-12-31 | Litens Automotive Partnership | Orbital tensioner assembly |
| CN104989793B (en) * | 2015-05-27 | 2017-08-29 | 纽尚(宁波)汽车轴承制造有限公司 | Double variable torque shelves friction shoe type stretchers |
| CN106168275A (en) * | 2016-08-30 | 2016-11-30 | 莱顿汽车部件（苏州）有限公司 | Dual directional tightener |
| CN109236962A (en) * | 2017-07-11 | 2019-01-18 | 上海贝序汽车科技有限公司 | A kind of tension pulley that automobile engine uses |
| US10883575B2 (en) * | 2018-01-03 | 2021-01-05 | Gates Corporation | Tensioner |
| CN108443439B (en) * | 2018-05-16 | 2023-07-04 | 无锡永凯达齿轮有限公司 | Asymmetric damping-adjustable automatic tensioner |
| JP7225842B2 (en) * | 2019-01-25 | 2023-02-21 | スズキ株式会社 | Mounting structure of auto tensioner for vehicle internal combustion engine |
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| EP0709595A1 (en) * | 1994-10-28 | 1996-05-01 | DAYCO PTI S.p.A. | Tensioner for driving belt |
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| CN2685654Y (en) * | 2004-03-31 | 2005-03-16 | 李文弟 | Motor vehicle engine belt tension apparatus |
| CN101344161A (en) * | 2007-07-13 | 2009-01-14 | 上海振华轴承总厂 | Automatic belt tensioning wheel of belt transmission system |
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| EP0709595A1 (en) * | 1994-10-28 | 1996-05-01 | DAYCO PTI S.p.A. | Tensioner for driving belt |
| CN1502023A (en) * | 2001-02-28 | 2004-06-02 | ���Ʋ�Ʒ�������ι�˾ | Belt tensioner for a power transmission belt system |
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| CN101666369A (en) | 2010-03-10 |
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Effective date of registration: 20160706 Address after: 201508 Shanghai City, Jinshan District Shanyang Zhen Shan Fu Road No. 181 building 3 Patentee after: Shanghai Beixu Automobile Technology Co., Ltd. Address before: 201508 Shanghai City, Jinshan District Shanyang Zhen Shan Fu Road No. 181 Patentee before: Shanghai Bioko Automobile Technology Co., Ltd. |