CN113914964A - Engine and decompression rocker arm positioning mechanism - Google Patents
Engine and decompression rocker arm positioning mechanism Download PDFInfo
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- CN113914964A CN113914964A CN202111294680.9A CN202111294680A CN113914964A CN 113914964 A CN113914964 A CN 113914964A CN 202111294680 A CN202111294680 A CN 202111294680A CN 113914964 A CN113914964 A CN 113914964A
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- rocker arm
- engine
- arm body
- decompression
- chain wheel
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- 230000006837 decompression Effects 0.000 title claims abstract description 68
- 230000007246 mechanism Effects 0.000 title claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims description 35
- 238000009434 installation Methods 0.000 claims description 18
- 230000000903 blocking effect Effects 0.000 claims description 17
- 230000005484 gravity Effects 0.000 claims description 8
- 238000013016 damping Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/08—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for decompression, e.g. during starting; for changing compression ratio
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The invention relates to an engine and a pressure reducing rocker arm positioning mechanism. The pressure reducing rocker arm positioning mechanism comprises: the rocker arm comprises a rocker arm body, a supporting piece and a first limiting piece, wherein the rocker arm body is used for being rotatably installed on an engine chain wheel, a swing gap is reserved between the rocker arm body and a wheel face of the engine chain wheel, the supporting piece is installed on the rocker arm body, the supporting piece is located in the swing gap, the supporting piece is in supporting conflict with the wheel face of the engine chain wheel, and according to the maximum preset swing position of the rocker arm body, the first limiting piece is installed on the engine chain wheel, and the first limiting piece is in limiting conflict with the supporting piece. Compare in traditional decompression rocking arm, above-mentioned decompression rocking arm positioning mechanism has realized the swing support to the rocking arm body through support piece, avoids the rocking arm body excessive wobbling condition to appear through first locating part. Therefore, the pressure reducing rocker arm positioning mechanism can swing more effectively according to the preset track.
Description
Technical Field
The invention relates to the technical field of engine assembly, in particular to an engine and a pressure reducing rocker arm positioning mechanism.
Background
When the engine is assembled, the decompression rocker arm is firstly arranged at a chain wheel of the engine in a swinging way, and the decompression rocker arm is fixed by a decompression baffle in an auxiliary way, for example: when the engine runs, the decompression rocker arm can swing along the radial direction of the chain wheel under the action of centrifugal force, and meanwhile, according to the structural characteristics of the engine, the decompression cam is matched with the decompression rocker arm in an installation mode (namely, when the decompression rocker arm is thrown away, the end part of the decompression cam can also rotate at the end part of the chain wheel of the engine). When the engine stops, the pressure reducing rocker arm can reset under the action of the resilience force. However, due to the structural limitation of the engine, a mounting gap exists between the traditional decompression rocker arm and the engine chain wheel, so that the decompression rocker arm is difficult to swing according to a preset track (for example, the decompression rocker arm is excessively swung).
Disclosure of Invention
In view of this, it is necessary to provide an engine and a decompression rocker arm positioning mechanism, which solve the problem that a decompression rocker arm is difficult to swing along a preset trajectory.
A pressure reducing rocker arm positioning mechanism. The pressure reducing rocker arm positioning mechanism comprises: the rocker arm comprises a rocker arm body, a supporting piece and a first limiting piece, wherein the rocker arm body is used for being rotatably installed on an engine chain wheel, a swing gap is reserved between the rocker arm body and a wheel face of the engine chain wheel, the supporting piece is installed on the rocker arm body, the supporting piece is located in the swing gap, the supporting piece is in supporting conflict with the wheel face of the engine chain wheel, and according to the maximum preset swing position of the rocker arm body, the first limiting piece is installed on the engine chain wheel, and the first limiting piece is in limiting conflict with the supporting piece.
The engine comprises the decompression rocker arm positioning mechanism, an engine chain wheel and a camshaft wheel set, wherein the camshaft wheel set is matched with the engine chain wheel in a transmission manner, a decompression cam is arranged on the camshaft wheel set, one end of the decompression cam extends out of the engine chain wheel, and one end of the decompression cam is used for being matched with the rocker arm body in a transmission manner.
In one of them embodiment, decompression rocking arm positioning mechanism still includes reset torsion spring, the one end of rocking arm body is equipped with the installation sleeve, the last rotation post that is equipped with of engine sprocket, the rocking arm body passes through the installation sleeve with the cooperation is established to the rotatory cover of rotation post, reset torsion spring cover is established the telescopic outside of installation, just reset torsion spring's one end with engine sprocket is inconsistent, reset torsion spring's the other end with the rocking arm body is inconsistent.
In one embodiment, the rocker arm body comprises an alignment mounting portion and an arc-shaped adapting portion, one end of the alignment mounting portion is fixedly mounted on the mounting sleeve, a first weight reducing portion is arranged on the alignment mounting portion along the extending direction of the alignment mounting portion, a second weight reducing portion is arranged in the arc-shaped adapting portion along the extending direction of the arc-shaped adapting portion, and the center of gravity of the rocker arm body is offset towards the periphery of the arc-shaped adapting portion.
In one embodiment, the alignment mounting portion and the arc adapting portion are matched to form a C-shaped rocker arm body, the alignment mounting portion and the arc adapting portion are integrally formed or spliced, the first weight reducing portion is arranged on one side of the C-shaped rocker arm body along the extending direction of the C-shaped rocker arm body, the second damping portion is arranged on the other side of the C-shaped rocker arm body, the joint of the alignment mounting portion and the arc adapting portion is a gravity center portion, and the first weight reducing portion and the second weight reducing portion are respectively located on two sides of the gravity center portion.
In one embodiment, the first weight-reducing portion and the second weight-reducing portion are weight-reducing grooves or weight-reducing cavities, the first weight-reducing portion extends from one end of the alignment mounting portion to the other end of the alignment mounting portion, and the second weight-reducing portion extends from one end of the arc-shaped adapting portion to the other end of the arc-shaped adapting portion.
In one embodiment, the decompression rocker arm positioning mechanism further comprises a decompression blocking piece and a fixing assembly, the decompression blocking piece is mounted on the engine chain wheel along the circumferential direction of the engine chain wheel, a swinging cavity used for the rocker arm body and the decompression cam to swing on the engine chain wheel is arranged on the decompression blocking piece, and the decompression blocking piece is sequentially fixedly matched with the engine chain wheel and the camshaft wheel set through the fixing assembly.
In one embodiment, the fixing assembly includes a first fixing member and a second fixing member, one end of the decompression blocking piece is sequentially connected and fixed with the engine sprocket and the camshaft wheel set through the first fixing member, the decompression blocking piece is further provided with a fixing portion, the fixing portion is attached to the wheel surface of the engine sprocket, and the fixing portion is sequentially connected and fixed with the engine sprocket and the camshaft wheel set through the second fixing member.
In one embodiment, the pressure reducing rocker arm positioning mechanism further includes a second limiting member, the second limiting member is mounted on the pressure reducing baffle, the second limiting member is located at the cavity opening of the swing cavity, and the second limiting member is used for limiting and abutting against one end of the pressure reducing cam protruding out of the engine cam.
In one embodiment, the decompression cam comprises a cam shaft and a transmission seat, the cam shaft is arranged in the cam shaft wheel set, one end of the cam shaft protrudes out of the engine chain wheel and is matched with the transmission seat in a mounting mode, the transmission seat is provided with a transmission rod, and the rocker arm body is provided with an adapting hole which is used for being matched with the transmission rod in a transmission mode.
After the decompression rocker arm positioning mechanism is arranged on the engine chain wheel, when the engine works, the engine chain wheel rotates, and the rocker arm body swings out or resets relative to the engine chain wheel under the action of centrifugal force of the engine chain wheel. The rocker arm body is rotatably mounted on an engine sprocket, for example: can install support piece on the rocker arm body this moment through the one end and the engine sprocket normal running fit of rocker arm body, the rocker arm body is when swinging, and support piece can be with the wheel face of engine sprocket continuous contact, can guarantee under support piece's effect promptly that the rocker arm body swings according to predetermineeing the swing base face, avoids the rocker arm body to appear the phenomenon of heeling when the swing. Further, confirm the mounted position of first locating part on the engine sprocket according to the biggest swing position of predetermineeing of rocking arm body (referring to the biggest swing position of rocking arm body in predetermineeing swing range), at this moment, after the rocking arm body throws away, support piece lasts and contacts with the wheel face of engine sprocket, guarantee that the rocking arm body swings according to predetermineeing the swing base face, when the rocking arm body reaches the biggest swing position of predetermineeing, support piece and first locating part take place to contradict, thereby avoided the rocking arm body the excessive wobbling condition to appear, guaranteed the result of use of rocking arm body. Compare in traditional decompression rocking arm, above-mentioned decompression rocking arm positioning mechanism has realized the swing support to the rocking arm body through support piece, avoids the rocking arm body excessive wobbling condition to appear through first locating part. Therefore, the pressure reducing rocker arm positioning mechanism can swing more effectively according to the preset track.
When the engine works, the engine chain wheel rotates, the rocker arm body swings out or resets relative to the engine chain wheel under the action of centrifugal force of the engine chain wheel, meanwhile, the decompression cam also rotates along with the rocker arm body, and one end of the decompression cam protrudes out of the surface of the engine chain wheel and is used for being matched with the rocker arm body. The mounting position of the first locating part on the engine chain wheel is determined according to the maximum preset swing position (the maximum swing position of the rocker arm body in a preset swing range) of the rocker arm body, at the moment, after the rocker arm body is thrown out, the support part is continuously contacted with the wheel surface of the engine chain wheel, the rocker arm body is guaranteed to swing according to a preset swing base surface, when the rocker arm body reaches the maximum preset swing position, the support part is in conflict with the first locating part, therefore, the situation that the rocker arm body excessively swings is avoided, and the using effect of the rocker arm body is guaranteed. Compare in traditional decompression rocking arm, above-mentioned decompression rocking arm positioning mechanism has realized the swing support to the rocking arm body through support piece, avoids the rocking arm body excessive wobbling condition to appear through first locating part. Therefore, the engine can ensure that the rocker arm body swings according to a preset track.
Drawings
FIG. 1 is a schematic diagram of an engine and a positioning mechanism for a pressure reducing rocker arm according to one embodiment;
FIG. 2 is a schematic diagram of another embodiment of an engine and a compression release rocker arm positioning mechanism;
fig. 3 is a schematic structural diagram of an engine and a decompression rocker arm positioning mechanism according to yet another embodiment.
10. The rocker arm comprises a swing clearance 100, a rocker arm body 101, an adapting hole 110, a return spring 120, a mounting sleeve 130, an alignment mounting part 131, a first weight-reducing part 140, an arc-shaped adapting part 141, a second weight-reducing part 200, a support part 300, a first limiting part 500, an engine sprocket 510, a rotating column 600, a camshaft wheel set 610, a pressure-reducing cam 611, a camshaft 612, a transmission seat 613, a transmission rod 700, a pressure-reducing baffle plate 710, a swing cavity 800, a fixing assembly 810, a first fixing part 820, a second fixing part 900 and a second limiting part.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
With reference to fig. 1 to 3, in an embodiment, an engine includes the decompression rocker arm positioning mechanism, and further includes an engine sprocket 500 and a camshaft wheel set 600, where the camshaft wheel set 600 is in transmission fit with the engine sprocket 500, and a decompression cam 610 is disposed on the camshaft wheel set 600, one end of the decompression cam 610 extends out of the engine sprocket 500, and one end of the decompression cam 610 is used for being in transmission fit with the rocker arm body 100.
When the engine is operated, the engine sprocket 500 rotates, the rocker arm body 100 swings out or returns relative to the engine sprocket 500 under the centrifugal force of the engine sprocket 500, and the decompression cam 610 rotates along with the rotation of the engine sprocket 500, and one end of the decompression cam 610 protrudes from the surface of the engine sprocket 500 and is used for being matched with the rocker arm body 100. The mounting position of the first limiting part 300 on the engine chain wheel 500 is determined according to the maximum preset swing position of the rocker arm body 100 (the maximum swing position of the rocker arm body 100 within the preset swing range), at this time, after the rocker arm body 100 is thrown away, the support part 200 is continuously contacted with the wheel surface of the engine chain wheel 500, the rocker arm body 100 is guaranteed to swing according to a preset swing base surface, when the rocker arm body 100 reaches the maximum preset swing position, the support part 200 is in conflict with the first limiting part 300, so that the situation that the rocker arm body 100 excessively swings is avoided, and the using effect of the rocker arm body 100 is guaranteed. Compared with the conventional pressure reducing rocker arm, the pressure reducing rocker arm positioning mechanism realizes swinging support of the rocker arm body 100 through the support piece 200, and avoids the situation that the rocker arm body 100 excessively swings through the first limiting piece 300. Therefore, the engine can ensure that the rocker arm body 100 swings in accordance with a preset trajectory.
With reference to fig. 1 to 3, in an embodiment, the pressure reducing rocker arm positioning mechanism further includes a reset torsion spring, the one end of the rocker arm body 100 is provided with an installation sleeve 120, the engine sprocket 500 is provided with a rotation column 510, the rocker arm body 100 passes through the installation sleeve 120 and the rotation column 510 is rotatably sleeved with a set matching, the reset torsion spring is sleeved with the installation sleeve 120, the reset torsion spring is sleeved with the engine sprocket 500, one end of the reset torsion spring is abutted to the engine sprocket 500, and the other end of the reset torsion spring is abutted to the rocker arm body 100. Specifically, the mounting sleeve 120 and the rocker arm body 100 may be integrally formed or formed by splicing, and the rotating column 510 may be inserted into the engine sprocket 500 through a hole formed in the engine sprocket 500. Or the rotary post 510 is integrally formed with the engine sprocket 500. Further, the rocker arm body 100 is sleeved with the rotating column 510 through the mounting sleeve 120, so that the rotating effect of the rocker arm body 100 relative to the engine sprocket 500 is ensured. After the mounting sleeve 120 is sleeved on the rotating column 510, the mounting sleeve 120 is abutted to the wheel surface of the engine sprocket 500, that is, the mounting sleeve 120 and the supporting member 200 simultaneously support the rocker arm body 100 in a swinging manner, so that the rocker arm body 100 can swing according to a preset track. Furthermore, the reset of the rocker arm body 100 is realized by a reset torsion spring, and meanwhile, the reset torsion spring can also avoid the condition that the rocker arm body 100 excessively swings.
Referring to fig. 1 to 3, in an embodiment, the rocker arm body 100 includes an alignment mounting portion 130 and an arc-shaped adapting portion 140, one end of the alignment mounting portion 130 is fixedly mounted on the mounting sleeve 120, a first weight-reducing portion 131 is formed on the alignment mounting portion 130 along an extending direction of the alignment mounting portion 130, a second weight-reducing portion 141 is formed in the arc-shaped adapting portion 140 along the extending direction of the arc-shaped adapting portion 140, and a center of gravity of the rocker arm body 100 is offset toward an outer periphery of the arc-shaped adapting portion 140. Specifically, the size of the rocker arm body 100, including the length and shape of the alignment mounting portion 130, is determined according to the size and shape of the engine sprocket 500; the length, arc, etc. of the arcuate mating portion 140. When the alignment mounting portion 130 is rotationally engaged with the engine sprocket 500, for example: through adding on engine sprocket 500 and establishing rotation post 510, counterpoint installation department 130 passes through the installation sleeve 120 and rotationally establishes the cooperation with rotation post 510, can be through adding on the engine and establish the rotation that resets of reset torsional spring in order to realize counterpoint installation department 130 simultaneously. Further, when the engine is operated, the engine sprocket 500 rotates and generates a centrifugal force, and the rocker arm body 100 performs centrifugal rotation under the action of the centrifugal force, so that the blockage of the engine valve by the rocker arm body 100 is released. When the engine stops working, the centrifugal force of the engine chain wheel 500 disappears, and the rocker arm body 100 can reset and rotate under the action of the tension of the torsion spring, so that the engine valve is shielded. Compared with the traditional solid rocker arm body 100, the rocker arm body 100 has the advantages that the weight of the rocker arm body 100 can be effectively reduced by arranging the first weight reducing part 131 on the alignment installation part 130 and arranging the second weight reducing part 141 on the arc-shaped adapting part 140, so that the rocker arm body 100 can be stressed and rotated more easily, and the using effect of the rocker arm body 100 is ensured.
In one embodiment, the alignment mounting portion 130 and the arc adapting portion 140 cooperate to form a C-shaped rocker arm body 100, the alignment mounting portion 130 and the arc adapting portion 140 are integrally formed or spliced, along the extending direction of the C-shaped rocker arm body 100, the first weight-reducing portion 131 is opened on one side of the C-shaped rocker arm body 100, the second damping portion is opened on the other side of the C-shaped rocker arm body 100, the connection portion between the alignment mounting portion 130 and the arc adapting portion 140 is a weight-reducing portion, and the first weight-reducing portion 131 and the second weight-reducing portion 141 are respectively located on two sides of the weight-reducing portion. Specifically, the alignment installation portion 130 and the arc-shaped adapting portion 140 are rod bodies or plate bodies. The shape of the rocker arm body 100 is designed to be C-shaped according to the size and shape of the engine sprocket 500, and when the decompression rocker arm is mounted on the engine sprocket 500, the radian of the C-shaped rocker arm body 100 is adapted to the circumferential radian of the engine sprocket 500. Further, the overall strength of the pressure reducing rocker arm can be changed by adjusting the overall thickness of the alignment mounting portion 130 and the overall thickness of the arc-shaped fitting portion 140. The self-strength of the pressure reducing rocker arm can be effectively ensured by integrally forming the alignment installation part 130 and the arc-shaped adapting part 140. Sometimes, the decompression rocker arm needs to be suitable for engine sprockets 500 of different sizes, and the alignment mounting portion 130 and the arc-shaped adapting portion 140 can be spliced and fixed, for example: the connection between the alignment installation part 130 and the arc-shaped adapting part 140 is realized by bolts or buckles. Furthermore, by providing the first weight-reducing portion 131 on the alignment mounting portion 130 and the second weight-reducing portion 141 on the arc-shaped adapting portion 140, the self weight of the pressure reducing rocker arm is adjusted, so that the center of gravity of the rocker arm body 100 is shifted toward the periphery of the arc-shaped adapting portion 140, and the above embodiment can more effectively improve the strength of the rocker arm body 100 during rotation.
In one embodiment, the first weight-reducing portion 131 and the second weight-reducing portion 141 are weight-reducing slots or weight-reducing cavities, the first weight-reducing portion 131 extends from one end of the alignment mounting portion 130 to the other end of the alignment mounting portion 130, and the second weight-reducing portion 141 extends from one end of the arc-shaped adapting portion 140 to the other end of the arc-shaped adapting portion 140. Specifically, the first weight-reducing portion 131 and the second weight-reducing portion 141 are opened while the strength requirement of the pressure reducing rocker arm itself is ensured, for example: the first weight-reducing portion 131 is opened from the outside toward the inside from one side of the rocker arm body 100, and the second weight-reducing portion 141 is opened from the outside toward the inside from the other side of the rocker arm body 100. In this embodiment, after the first weight-reducing portion 131 and the second weight-reducing portion 141 are opened, the strength of the rocker arm body 100 may need to be improved, and in this case, a first reinforcing cover and a second reinforcing cover may be additionally provided on the rocker arm body 100, that is, the first reinforcing cover is mounted on the alignment mounting portion 130, and the first weight-reducing portion 131 is covered and fixed by the first reinforcing cover; the second reinforcing cover is mounted on the arc-shaped mounting portion, and covers and fixes the first lightening portion 131.
Referring to fig. 1 to 3, in an embodiment, the pressure reducing rocker arm positioning mechanism further includes a pressure reducing baffle 700 and a fixing assembly 800, the pressure reducing baffle 700 is mounted on the engine sprocket 500 along the circumferential direction of the engine sprocket, the pressure reducing baffle 700 is provided with a swing cavity 710 for the rocker arm body 100 and the pressure reducing cam 610 to swing on the engine sprocket 500, and the pressure reducing baffle 700 is sequentially fixedly matched with the engine sprocket 500 and the camshaft pulley set 600 through the fixing assembly 800. The fixing assembly 800 includes a first fixing member 810 and a second fixing member 820, one end of the pressure reduction blocking sheet 700 is sequentially connected and fixed with the engine sprocket 500 and the camshaft wheel set 600 through the first fixing member 810, the pressure reduction blocking sheet 700 is further provided with a fixing portion, the fixing portion is attached to the wheel surface of the engine sprocket 500, and the fixing portion is sequentially connected and fixed with the engine sprocket and the camshaft wheel set 600 through the second fixing member 820. Specifically, the first fixing element 810 and the second fixing element 820 are fasteners or bolts, and the fixing portion is a plate or a rod. The fixing portion and the pressure reduction baffle 700 are integrally formed or spliced. Further, after one end of the pressure reduction baffle 700 is sequentially connected and fixed with the engine sprocket 500 and the camshaft wheel set 600 and the swing cavity 710 is opened on the pressure reduction baffle 700, the middle part of the pressure reduction baffle 700 is designed as a fixing part, for example: the pressure reduction stopper 700 is bent to form a fixing portion. After the decompression blocking sheet 700 is installed on the engine chain wheel 500, the fixing part can be fixedly attached to the surface of the engine chain wheel 500, so that the installation effect of the decompression blocking sheet 700 on the engine chain wheel 500 is effectively guaranteed.
Referring to fig. 1 to fig. 3, in an embodiment, the pressure reducing rocker arm positioning mechanism further includes a second limiting member 900, the second limiting member 900 is mounted on the pressure reducing baffle 700, the second limiting member 900 is located at the cavity opening of the swing cavity 710, and the second limiting member 900 is configured to be in limit contact with one end of the pressure reducing cam 610 protruding from the engine cam. Specifically, the second limiting member 900 is a limiting block or a limiting sheet. According to the maximum moving range of the decompression cam 610, the second limiting member 900 is additionally arranged on the decompression blocking sheet 700, so that the decompression cam 610 is prevented from applying excessive pushing force to the decompression rocker arm.
Referring to fig. 1 to 3, in an embodiment, the decompression cam 610 includes a camshaft 611 and a transmission seat 612, the camshaft 611 is installed in the camshaft wheel set 600, one end of the camshaft 611 protrudes out of the engine sprocket 500 and is installed and matched with the transmission seat 612, a transmission rod 613 is disposed on the transmission seat 612, and an adapter hole 101 for being in transmission fit with the transmission rod 613 is disposed on the rocker arm body 100. Specifically, the camshaft 611 drives the transmission seat 612 to rotate, and the transmission seat 612 extends into the fitting hole 101 through the transmission rod 613, so that the transmission seat 612 is in transmission fit with the rocker arm body 100. Further, when the adaptive hole 101 is formed, the radian of the hole wall of the adaptive hole 101 can be determined according to the actual swing radian of the rocker arm body 100, and the above embodiment can effectively ensure the transmission contact effect between the transmission rod 613 and the rocker arm body 100, and avoid the situation that the transmission rod 613 is locked with the rocker arm body 100 or the situation that the local friction force at the connection part (transmission part) of the transmission rod 613 and the rocker arm body 100 is large.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A pressure reducing rocker arm positioning mechanism, comprising: the rocker arm comprises a rocker arm body, a supporting piece and a first limiting piece, wherein the rocker arm body is used for being rotatably installed on an engine chain wheel, a swing gap is reserved between the rocker arm body and a wheel face of the engine chain wheel, the supporting piece is installed on the rocker arm body, the supporting piece is located in the swing gap, the supporting piece is in supporting conflict with the wheel face of the engine chain wheel, and according to the maximum preset swing position of the rocker arm body, the first limiting piece is installed on the engine chain wheel, and the first limiting piece is in limiting conflict with the supporting piece.
2. An engine, characterized in that, includes the decompression rocking arm positioning mechanism of claim 1, still includes engine sprocket and camshaft wheelset, the camshaft wheelset with engine sprocket transmission cooperation, and be equipped with decompression cam on the camshaft wheelset, decompression cam one end stretches out the engine sprocket, decompression cam's one end be used for with rocking arm body transmission cooperation.
3. The engine of claim 2, characterized in that, decompression rocking arm positioning mechanism still includes reset torsion spring, the one end of rocking arm body is equipped with the installation sleeve, be equipped with on the engine sprocket and rotate the post, the rocking arm body pass through the installation sleeve with it establishes the cooperation to rotate the post rotationally cover, reset torsion spring cover is established the telescopic outside of installation, just reset torsion spring's one end with engine sprocket is inconsistent, reset torsion spring's the other end with the rocking arm body is inconsistent.
4. The engine of claim 3, wherein the rocker arm body includes an alignment mounting portion and an arc-shaped adapting portion, one end of the alignment mounting portion is fixedly mounted on the mounting sleeve, a first weight-reducing portion is formed on the alignment mounting portion along an extending direction of the alignment mounting portion, a second weight-reducing portion is formed in the arc-shaped adapting portion along the extending direction of the arc-shaped adapting portion, and a center of gravity of the rocker arm body is offset toward a periphery of the arc-shaped adapting portion.
5. The engine of claim 4, wherein the alignment mounting portion and the arc-shaped adapting portion are matched to form a C-shaped rocker arm body, the alignment mounting portion and the arc-shaped adapting portion are integrally formed or spliced, along the extending direction of the C-shaped rocker arm body, the first weight reducing portion is arranged on one side of the C-shaped rocker arm body, the second damping portion is arranged on the other side of the C-shaped rocker arm body, the joint of the alignment mounting portion and the arc-shaped adapting portion is a gravity center portion, and the first weight reducing portion and the second weight reducing portion are respectively located on two sides of the gravity center portion.
6. The engine of claim 5, wherein the first weight-reducing portion and the second weight-reducing portion are weight-reducing grooves or weight-reducing cavities, the first weight-reducing portion extends from one end of the alignment mounting portion to the other end of the alignment mounting portion, and the second weight-reducing portion extends from one end of the arc-shaped adapting portion to the other end of the arc-shaped adapting portion.
7. The engine of claim 3, wherein the decompression rocker arm positioning mechanism further comprises a decompression blocking piece and a fixing component, the decompression blocking piece is arranged on the engine chain wheel along the circumferential direction of the engine chain wheel, a swinging cavity for the rocker arm body and the decompression cam to swing on the engine chain wheel is arranged on the decompression blocking piece, and the decompression blocking piece is sequentially fixedly matched with the engine chain wheel and the camshaft wheel set through the fixing component.
8. The engine of claim 7, wherein the fixing assembly comprises a first fixing member and a second fixing member, one end of the decompression blocking piece is sequentially connected and fixed with the engine chain wheel and the camshaft wheel set through the first fixing member, a fixing portion is further arranged on the decompression blocking piece, the fixing portion is attached to the wheel surface of the engine chain wheel, and the fixing portion is sequentially connected and fixed with the engine chain wheel and the camshaft wheel set through the second fixing member.
9. The engine of claim 7, wherein the pressure reducing rocker arm positioning mechanism further comprises a second limiting member, the second limiting member is mounted on the pressure reducing baffle, and the second limiting member is located at the cavity of the swing cavity, and the second limiting member is configured to be in limit contact with an end of the pressure reducing cam protruding out of the engine cam.
10. The engine of any one of claims 2 to 9, wherein the decompression cam comprises a camshaft and a transmission seat, the camshaft is mounted in the camshaft wheel set, one end of the camshaft protrudes out of the engine sprocket and is in fit with the transmission seat, the transmission seat is provided with a transmission rod, and the rocker arm body is provided with an adapting hole for being in fit with the transmission rod.
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| CN202111294680.9A CN113914964A (en) | 2021-11-03 | 2021-11-03 | Engine and decompression rocker arm positioning mechanism |
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| CN202111294680.9A CN113914964A (en) | 2021-11-03 | 2021-11-03 | Engine and decompression rocker arm positioning mechanism |
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