TW201030227A - Pressure-reducing device of engine - Google Patents

Abstract

The present invention relates to a pressure-reducing device of engine, which comprises: a camshaft; an unidirectional clutch fitted around the camshaft; a pressure-reducing cam fixed on the outer circumference surface of the unidirectional clutch; a stopping part fixedon the outer circumference surface of the unidirectional clutch; a valve-driving member; a stopping block pivotally installed at the arm shaft of valve-driving member; and an elastic member to position the stopping block. When the camshaft rotates in the forward direction, the stopping part pivotally rotates to prop against the stopping part correspondingly. Thus, there is no need of additionally machining a installation hole for fixing the stopping block on the structure of cylinder head, which reduces the number of parts, reduces the cost, and can be applied in both integral-type or separated-type cylinder head.

Description

201030227 VI. Description of the Invention: [Technical Field] The present invention relates to a pressure reducing device, and more particularly to a pressure reducing device suitable for a power engine. [Prior Art]

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When the engine is turned off, the engine will continue to rotate a few revolutions due to the inertia of the crankshaft. During this process, there are many impedances that cause the rotation to gradually slow down and finally stop. The largest impedance is the compression pressure of the compression stroke, so the engine is often subjected to the compression pressure to cause the normal rotation to stop and then reverse, and then stop. When the animal engine is to be restarted-----*, the door and the base are moved to the combustion chamber. At this time, both the intake valve and the exhaust valve system are in the closed state. Therefore, the piston must overcome the internal pressure of the cylinder when moving. The pressure of the gas is squeezed to complete the movement of the remainder. That is, whether it is started by an electric motor or manually applied, it is necessary to raise the torque of the mosquito to overcome the gas pressure in the aforementioned steam red. If it is up to start, then the electric motor must be designed to have a larger twist,", ^, type and increase the cost; if it is started by Wang Shili, and stepping on the engine of the engine car, it will lead to easy pedaling. Increase the user's burden. 彳Μ 骑 骑 骑 且 且 且 且 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上 上And pay 1 glaze to the top dead center of the I contraction and stop the rotation and then reverse, _ by the dream..." ^Cylinder repeatedly rises and installs" between the cam sleeve and the decompression cam 20 201030227 ίο 15 A coupling state is formed to the clutch, and the decompression cam rotates with the cam shaft-same rotation. The cam portion of the decompression cam abuts the rocker arm to open at least one of the intake valve and the exhaust gas, so that the pressure in the cylinder can be reduced. The down-rotor torque required to start the crankshaft or manually apply the force by the starter motor to help the engine start. Such a decompression device will set the decompression cam in a fixed position. Therefore, in addition to the decompression cam, a peripheral surface of the outer ring of the one-way clutch is additionally provided with a stopper, and the structure of the steam head is required to be drilled. A device hole. The stopper for positioning is blocked in the hole of the device for abutting against the stop portion of the one-way clutch so that the decompression cam is blocked in a position, and the ridge is sleeved on the rotating shaft of the stopper for Position the stop at a specific location. Referring to Figures 1 and 2, there is a broken view of a conventional engine steam head, and a cross-sectional view. The figure shows that the cylinder head 90 is provided with a camshaft 91 and a valve drive member 92. A one-way clutch % is arranged on the cam shaft 91. A decompression cam 94 is protrudedly protruded from the outer circumferential surface of the one-way clutch 93, and a stop portion 95 is formed. The positioning block 96 (four) is turned (four) The camshaft seat 90 of the cylinder head 90 is less economical to manufacture due to the additional machining of the shaft hole, and if the engine is in the integrated cylinder head, the mounting method of the positioning block 96 is difficult to achieve. 2〇 [Summary of the Invention] The engine pressure reducing device of the present invention comprises a cam shaft, a one-way clutch, a pressure reducing cam, a stopper, a valve driving member, and a collision block. The one-way clutch is sleeved on the camshaft and is disposed in a direction to transmit torque when the camshaft is reversed. The camshaft forward rotation refers to the rotation of the camshaft when the engine is running normally. 201030227 The movement is reversed (reverse rotation). The decompression cam and the stopping portion are both fixed on the outer circumferential surface of the one-way clutch, and the decompression cam includes a working portion. The valve drive member includes an arm shaft #, wherein the arm system is pivotally disposed on the arm shaft. The stopper is also pivoted on the #-axis of the valve drive member and includes a stop portion, wherein when the cam shaft rotates forward, the stop portion pivots to abut against the stop portion. The engine decompression device also includes an elastic member that is positively seated against the cylinder head by the restoring force stop of the resilient member.

10 . . With the above device, under the normal operation of the engine, the cam shaft rotates forward, so that the stopper on the one-way clutch abuts against the stopper of the stopper to achieve the purpose of positioning the cam to a predetermined position. On the other hand, compared with the conventional slanting method of the stopper, the invention adopts the method of placing the stopper on the single-arm shaft, thereby eliminating the trouble of reserved a bolt device hole in the cylinder head, and also because of the two processing procedures. . i 15 Ref. 20 Abutment or: Two top two parts = When the contact is made to make the stop part TM stop, the contact steam is removed. The material can be twisted spring or the above-mentioned decompression cam and the stop can be recognized as "丄Up the above valve _ can be::=piece or = shaft surface, along the convex arm valve valve." The moving member, or a slanting axle, includes a tilting axle that is inclined outwardly in the forward direction. 5 25 201030227 [Embodiment] Referring to Figures 3 to 6, respectively, the engine cylinder head perspective view and disconnection diagram of the first embodiment of the present invention are Explosion diagram of the decompression device and cross-sectional view of the cylinder head. In the figure, the steam head of the engine cylinder is displayed, and the decompression device is assembled. '5 The decompression device includes the camshaft 11, the one-way clutch 12, and the decompression The cam 13, the two-valve driving member 14, 15, the ejector member 16, the stopper 17, and a stopping portion 18. The cam shaft 11 is fixed with a two-valve moving cam and a sprocket 113, and the two-valve moving cam is advanced. The air cam 111 and the exhaust cam 112' have an intake cam hi closer to the sprocket Φ 113. 10 The one-way clutch 12 is sleeved on the camshaft 11 in a sleeve direction to transmit torque when the camshaft 11 is reversed, and In the example, a roller type one-way clutch is used. The so-called positive rotation of the camshaft 11 Without losing its general meaning, it refers to the rotation of the camshaft 11 in a specific direction under normal operation, and the reverse rotation is reverse rotation with the former. The one-way clutch 12 also has a oil groove 12 provided to provide lubrication 15 for oil entering. The lubricating cam 13 is lubricated between the one-way clutch 12 and the camshaft 11. The decompression cam 13 is fixed to the outer circumferential surface of the one-way clutch 12, because φ is used when the one-way clutch 12 transmits torque due to the reversal of the camshaft 11. The decompression cam 13 follows the rotation, otherwise it is substantially stationary during the forward rotation. The decompression cam 13 includes a working portion 131' which is higher than the base circle for generating the valve driving member 20 14 when the engine is stopped. The small deflection, which in turn causes the valve tappet 21 to open the cylinder valve. In addition, the stop portion 18 is convex, and is also fixed on the outer circumferential surface of the one-way clutch 12. The decompression cam 13, the stop portion 18, And the outer casing portion of the one-way clutch 12 can be manufactured by integral molding. In the present example, the towel stop portion 18 is located at a different axial position from the pressure reducing cam 13, and the decompression convex 201030227 wheel 13 is closer to the intake cam. Ill ^stop 18 includes a tilt The surface is inclined outward in the forward direction of the camshaft. The two valve driving members 14, 15 are respectively used for the intake valve and the exhaust valve (not shown), which are referred to as the intake valve driving member 14, and the exhaust The valve driving member 15, the intake cam 1 Π and the exhaust cam 112 on the cam shaft 5 1 也就 are also respectively disposed corresponding to the rollers 141, 15 1 of the above-mentioned two-turn driving members 14, 15 to the intake valve driving member i For example, it includes an arm shaft 142, an arm 143, and a roller 141. The exhaust valve driving member 15 has the same composition. The two valve driving members 14, 15 are placed on the two sides of the cam shaft. The valve drive member 14 used in the present invention is a rocker type valve drive member, and thus the arm 143 is a rocker arm. The arm 143 is pivotally disposed on the arm shaft 142 and laterally (in the present embodiment, the axial direction X) is provided with one of the driven portions 144 in a convex shape, and the roller 141 is rotatably sandwiched between the arms 143 The end is also shaped. The cylinder head 10 includes a cam shaft seat 101, and the arm shafts 142, 152 of the cam shaft 11, and the two valve members are disposed in parallel in the cam shaft seat 1〇1 with the cam shaft 11 in the middle. The cylinder head 10 also includes a cover plate 1 〇 2 that is locked to the Φ wheel axle seat 〇1. In this example, the camshaft seat ιοί is a separate camshaft seat. The ejector member 16 is rotatably sleeved on the arm shaft 142 of the intake valve driving member 14, and the two ends are an abutting portion 161 and a driving portion 162, respectively. The abutting portion 161 of the ejector member 16 abuts against the cam shaft seat 1 by being disposed on the shaft 142 of the arm 20 and respectively abutting against the top member 16 and the torsion spring 22 of the cam shaft holder 101. 1 盍 board 102. The lower portion and the upper portion of the driving portion 162 respectively correspond to the working portion 131 of the decompression cam 13 and the driven portion 144 on the arm 143, that is, the driving portion 162 is pushed by the rotating working portion 131 and is pushed up by the pushing portion. Drive unit 7 201030227 144. In detail, when the driving portion 162 of the ejector member 16 is subjected to a force in the reverse direction of the cam shaft, for example, from the decompression cam 13, the ejector member 16 starts to pivot and then the driving portion 162 touches and pushes the arm 143. The side driven portion 5 144 'the arm 143 of the valve drive member 14 will thus rotate 'to finally cause the valve lifter 21 to move open to the valve to achieve the engine decompression effect. The stopper 17 is rotatably sleeved on the arm shaft 152 of the exhaust valve driving member ’5 and includes an abutting portion 171 and a stopper portion 172. The abutting portion 171 10 of the stopper 17 abuts against the cover plate 1 〇 2 of the cam shaft base 101 through the two ends, respectively, against the top stopper 17 and the torsion spring 凸轮1 of the cam shaft seat 1 ,1. The stop portion 172 radially corresponds to the stop portion 18 on the circumferential surface of the outer ring 12 of the early clutch. The purpose of the stopper 17 is explained below. Although the one-way clutch 12 is not ideally coupled to follow the rotation when the camshaft is rotating forward, it is actually slightly caused by the inevitable friction between the camshaft 11 and the one-way clutch 12 body and its rollers. Forward rotation 'Therefore, the stop 18 on the clutch will also follow the rotation. When the stopper portion 18 gradually turns to contact and presses the stopper stopper portion 172, the integral portion of the stopper block 171 abuts against the cover plate 1〇2 of the camshaft seat 1〇1, so that the entire block remains intact. This also keeps the stopper 18, the one-way clutch 12, and the decompression cam 13 stationary. In a very special case, when the camshaft 11 is reversed nearly one turn and the stopper 18 is pressed against the stop π from below, the stopper 17 itself can be pivoted, so that the stopper 18 can be easily and elastically pushed. The stopper 17 is rotated (when the stopper abutting portion 171 is disengaged from the cover plate 1〇2 of the camshaft seat 1), and then returned to the original position. Referring to Figures 7 to 9', the cylinder head of the second embodiment is a perspective view, a broken view, 8 201030227, and a decompression device I, 醢m ^ ^

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20 The same applies to the example, the difference is as follows. The structure of the decompression device is roughly the same as that of the first-seat, the ejector, and the following. The camshaft 101 is a camshaft 盥β should be applied to the exhaust valve. The driving member and the stopping portion 33 are located at the same drawing position of the Μ working portion 321, the stopping portion 33 and the decompression wheel are corresponding to the ejector member 16, that is, the two are outside the one-way clutch. The segment has a predetermined circumferential spacing between the two. Because this special configuration 'allows the ejector member 16 to have the function of the stopper at the same time, the stopper portion of the aforementioned damper is responsible for the driving portion 162 of the ejector member 16; the damper is pressed against the Ρ田二疋 by the ejector The 丨6 is replaced by the 丨6丨. It can be seen that it is not necessary to provide the two components of the stopper and the pusher in the engine in the same way, which saves the material cost and reduces the assembly steps. Referring to Fig. 10 and Fig. 11, respectively, the cylinder head scraping view when the decompression cam is not actuated and acts. When the engine is running normally and the camshaft u is rotating forward, the forward direction is as indicated by the reference numeral N, and the stopping portion 33 on the one-way clutch 31 can abut against the driving portion 162 of the ejector member 16, at this time, the ejector member The abutting portion 161 of the abutment portion 161 abuts against the cover 丨02 of the camshaft base 101, so that the one-way clutch 31, the decompression cam 32, and the stopper portion 33 can be held still. At this time, the decompression cam 32 does not function. When the engine is stopped and the camshaft 11 is reversed, the reverse direction is as shown by the reference numeral R'. The decompression cam 32 on the one-way clutch 31 touches the working portion 321 and pushes the driving portion 162 of the ejector member 16, thereby driving The portion 162 is rotated and pushes the driven portion 144' beside the arm 143 and the abutment portion 161 of the ejector member 16 is separated from the cover plate 102 of the camshaft mount 101. The circumferential distance between the stopper portion 3 3 and the decompression cam working portion 3 21 is related to the amount of reversal after the cam shaft 11 is stopped, and this information can be obtained by prior experiment or 9 201030227 simulation according to various occasions. Referring to Fig. 12, there is shown an exploded view of the pressure reducing device of the third embodiment of the present invention, except that the arm 34 is driven.

The cam working portion 321 ' is reduced and the projection 352 radially corresponds to the groove. This structure can also perform the same functions as the above embodiment. S This embodiment is substantially the same as the second example, the portion 341 is a groove, and the ejector member 3 351 and the self-propelled boat are at κ 71 2" ❿ 10 15 with reference to FIG. 13, which is a cylinder of the fourth embodiment of the present invention. Head section view. This example mainly illustrates that the pressure reducing device of the present invention is also applicable to an engine in which the valve driving member is a swing arm valve driving member. The swing arm valve driving member, as the name suggests, has a pivoting end 411 of the arm. At the end, the roller 42 is located between the pivoting end 411 and the tappet fixing end 412. Similarly, the side of the swing arm 41 is provided with a driven portion 43 projecting toward the axial direction, which is a protrusion and a pushing member 44. It is disposed on the arm shaft 45 through the torsion spring 46. The present embodiment is further characterized in that the cam shaft 丨丨 and the one-way clutch 12 thereon, the valve cam (the figure only shows the exhaust cam 112) and the decompression cam 32 All of them are located above the valve driving member. The decompression cam 32 and the stopper portion 33 of this example are also disposed at the same axial position as the second embodiment. Referring to Figures 14, 15, the cylinder of the fifth embodiment of the present invention The first perspective view and the disconnection diagram. This embodiment mainly shows that the pressure reducing device 51 can also be disposed near the sprocket 113. And in the side close to the intake valve driving member 14, that is, in the decompression device 51, the ejector member 52 interacts with the intake valve driving member 14. Of course, the sprocket 113 is not necessarily required to be as described above. It is disclosed as an intake rocker arm (or swing arm), and may also be an exhaust rocker arm (or swing arm), and no matter which kind of 20 201030227 design, the pressure reducing device of the present invention is also applicable, which is a well-known artist. Although the camshaft seat and the cylinder head of the above embodiment are divided into parts, the present invention is also applicable to those skilled in the art of the camshaft seat and the steam head. The above-described embodiments are merely exemplified for the convenience of the description, and the scope of the claims should be based on the above-mentioned embodiments. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view of a conventional engine cylinder head. Figure 2 is a cross-sectional view of a conventional engine cylinder head. Figure 3 is a perspective view of an engine cylinder head according to a first preferred embodiment of the present invention. Better Figure 5 is an exploded view of the decompression device of the first preferred embodiment of the present invention. Figure 6 is a cross-sectional view of the engine cylinder head of the first preferred embodiment of the present invention. Fig. 8 is a perspective view of the engine cylinder head of the second preferred embodiment of the present invention. Fig. 9 is an exploded view of the pressure reducing device of the second preferred embodiment of the present invention. Figure 1 (H is a cross-sectional view of the engine steam head when the pressure reducing cam of the second preferred embodiment of the present invention is not in use. Figure 11 is a cross-sectional view of the engine cylinder head when the pressure reducing cam is applied according to the second preferred embodiment of the present invention. 12 is an exploded view of a decompression device according to a third preferred embodiment of the present invention. FIG. 13 is a cross-sectional view of a cylinder head of an engine according to a fourth preferred embodiment of the present invention. FIG. 14 is a perspective view of a cylinder head of an engine according to a fifth preferred embodiment of the present invention. 15 is an engine cylinder head disconnection diagram of a fifth preferred embodiment of the present invention.

[Main component symbol description] Cylinder head 90 Camshaft 91 One-way clutch 93 Stopper 95 Cylinder head 1 〇 Cover 102 Intake cam 111 Sprocket 113 Oil groove 121 Working part 131, 321 Roller 141, 151, 42 Arm 143, 34, 41 Exhaust valve drive 15 abutment 161 stop 17 stop 172 valve tappet 21 contact 351 camshaft seat 901 valve drive 92 decompression cam 94 stop 96 camshaft mount 101 camshaft 11 exhaust cam 112 One-way clutch 12, 31 decompression cam 13, 32 intake valve drive member 14 arm shaft 142, 152, 45 driven portion 144, 341, 43 ejector member 16, 35, 44, 52 drive portion 162 abutment portion 171 stop portion 18 , 33 torsion spring 22, 23, 46 extension protrusion 352 12 201030227 pivot end 411 fixed end 412

Pressure reducing device 51 axial X

Camshaft forward direction N camshaft reverse direction R

13

Claims (1)

201030227 VII. Patent application scope: 1. An engine pressure reducing device is installed in a cylinder head. The engine pressure reducing device comprises: / a cam shaft; a one-way clutch sleeved on the cam shaft and attached to the cam a torque is transmitted when the shaft is reversed; a decompression cam is fixed on the outer circumferential surface of the one-way clutch and includes a working portion; a stop portion is fixed on the outer circumferential surface of the one-way clutch; A valve drive member includes an arm shaft and an arm pivotally disposed on the arm shaft; a stopper pivotally disposed on the arm shaft of the valve drive member, including a stop portion, wherein the cam shaft In the forward rotation, the stopping portion pivots to correspond to the top: the stopping portion; and 15 an elastic member that pushes the stopper against the cylinder head. 2. The engine pressure reducing device according to claim 1, wherein the stopper further comprises an abutting portion that is pivotable to contact the top or not to abut the steam red head. 3. The engine pressure reducing device according to claim 2, wherein the abutting portion is a cover plate that contacts the camshaft seat of the steam head. 4. The engine pressure reducing device according to claim 1, wherein the pressure reducing cam and the stopper are axially offset. 5. The engine pressure reducing device according to the above-mentioned item, wherein the pressure reducing cam and the stopping portion overlap in the axial direction. 14 201030227 6. If the patent application scope is lj§& The valve driving member is a rocking and decompressing device, which is described in the patent application scope:: driving the moving machine: 5 in the 'the wide driving member is - swing arm type reading drive = 5 engine a pressure reducing device, 8 of which, in the scope of the patent application, includes a four-faceted two-pressure reducing device that is inclined outwardly, and that is in the forward direction of the cam shaft. 15