TWI656278B - Engine pressure reducing device - Google Patents
Engine pressure reducing device Download PDFInfo
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- TWI656278B TWI656278B TW104125935A TW104125935A TWI656278B TW I656278 B TWI656278 B TW I656278B TW 104125935 A TW104125935 A TW 104125935A TW 104125935 A TW104125935 A TW 104125935A TW I656278 B TWI656278 B TW I656278B
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Abstract
本發明是提供：起動操作很平順，即使老人和女性也可以很容易起動操作的構造簡單的引擎的減壓裝置。 SUMMARY OF THE INVENTION The present invention provides a decompression device of a simple construction engine which can be easily started even if an old man and a woman can start the operation.
本發明的減壓裝置，是在凸輪齒輪(8)的凹部(22)內，形成有：朝半徑方向延伸的減壓溝(29)以及朝周方向延伸的弧狀溝(30)。在減壓溝(29)內，收容著可在其中一端的減壓位置與其中另一端的非減壓位置之間進行移動的圓柱狀的減壓凸輪(23)，當減壓凸輪(23)位在減壓位置時，是從形成在凸輪面(7a)的開口部(32)突出到凸輪面(7a)上，位在非減壓位置時，則是從開口部(32)退避。在凸輪齒輪(8)的凹部(22)，設有可擺動的離心配重控制桿(24)，利用彈簧(25)朝向對抗凸輪齒輪(8)旋轉時所產生的離心力的方向，對離心配重控制桿(24)進行彈推。在離心配重控制桿(24)上，形成有：嵌入於凸輪齒輪(8)的弧狀溝(30)，並且可因應離心配重控制桿(24)的轉動而促使減壓凸輪(23)在減壓位置與非減壓位置之間進行移動的減壓突起(41)。 In the decompression device of the present invention, a pressure reducing groove (29) extending in the radial direction and an arcuate groove (30) extending in the circumferential direction are formed in the concave portion (22) of the cam gear (8). In the pressure reducing groove (29), a cylindrical decompression cam (23) movable between a decompressed position of one end and a non-decompressed position of the other end is accommodated, as the decompression cam (23) When it is at the decompression position, it protrudes from the opening (32) formed on the cam surface (7a) to the cam surface (7a), and when it is at the non-decompression position, it is retracted from the opening (32). In the recess (22) of the cam gear (8), a swingable centrifugal weight control lever (24) is provided, and the centrifugal force is generated by the spring (25) toward the centrifugal force generated when the cam gear (8) rotates. The heavy lever (24) is pushed. On the centrifugal weight control lever (24), an arcuate groove (30) embedded in the cam gear (8) is formed, and the decompression cam (23) is urged in response to the rotation of the centrifugal weight control lever (24). A decompression protrusion (41) that moves between a decompressed position and a non-decompressed position.
Description
本發明是關於：使用在泵浦、割草機(weed whacker,bush cutter)等的小型引擎中，利用手拉式起動器來進行起動操作時能夠減輕活塞的壓縮阻力，可以很容易進行起動操作的引擎的減壓裝置。 The present invention relates to the use of a small engine such as a pump, a lawn cutter, or the like, which can reduce the compression resistance of the piston when the starter operation is performed by a hand-operated starter, and can be easily started. The decompression device of the engine.
以往習知的這種減壓裝置，是在與用來開閉吸氣閥及排氣閥的凸輪構成一體的凸輪齒輪上，設置了具有缺口的減壓軸與離心配重。在進行起動時，減壓軸的周面的一部分將會從凸輪面的開口突出，並在引擎的壓縮工序中，經由凸輪從動件將推桿往上抬，因此吸氣閥將會稍微打開，因而可減輕活塞的壓縮阻力，可使起動操作變得容易。當引擎起動之後，離心配重將利用離心力而進行移動，減壓軸進行轉動，減壓軸的缺口將會面臨凸輪面的開口，以使得在壓縮工程中，不讓吸氣閥打開，而可進行通常的運轉。 Conventionally, such a pressure reducing device is provided with a pressure reducing shaft having a notch and a centrifugal weight on a cam gear integrally formed with a cam for opening and closing an intake valve and an exhaust valve. At the time of starting, a part of the circumferential surface of the pressure reducing shaft will protrude from the opening of the cam surface, and in the compression process of the engine, the push rod is lifted up via the cam follower, so the suction valve will be slightly opened. Therefore, the compression resistance of the piston can be alleviated, and the starting operation can be facilitated. When the engine is started, the centrifugal weight will be moved by the centrifugal force, and the pressure reducing shaft will rotate. The gap of the pressure reducing shaft will face the opening of the cam surface, so that in the compression project, the suction valve is not allowed to open, and the normal operation can be performed. The operation.
專利文獻1所揭示的減壓裝置，如第7圖所示，是在與凸輪51構成一體的正時齒輪52上，設置可轉 動的控制桿55，該控制桿55是與具有缺口53的減壓凸輪軸54構成一體，並且設置有可轉動的離心配重57，該離心配重57是具有可與控制桿55進行卡合的作動銷56。這種減壓裝置，在進行起動時，減壓凸輪軸54的一部分的周面將會從凸輪面51a的開口突出而形成微小挺舉部，當起動之後，離心配重57將利用離心力而進行移動，控制桿55就會以減壓軸54為中心進行轉動，缺口53將會面臨開口，微小挺舉部就會退去。 The pressure reducing device disclosed in Patent Document 1, as shown in Fig. 7, is provided on the timing gear 52 integrally formed with the cam 51, and is set to be rotatable. a control lever 55 that is integral with the decompression camshaft 54 having a notch 53 and is provided with a rotatable centrifugal weight 57 that is engageable with the control lever 55 Actuation pin 56. In the decompression device, when the starting device is started, the peripheral surface of a part of the decompression camshaft 54 protrudes from the opening of the cam surface 51a to form a small jerk portion, and after starting, the centrifugal weight 57 is moved by the centrifugal force. The lever 55 is rotated about the decompression shaft 54, and the notch 53 will face the opening, and the small jerk will retreat.
這個專利文獻1所揭示的減壓裝置，減壓凸輪軸54的一部分的周面是朝向凸輪面51a突出，凸輪從動件可平順地運行在減壓凸輪軸54上，因此起動操作很平順，但是，與減壓凸輪軸54構成一體的控制桿55是與離心配重57一起構成連桿機構，所以構造很複雜。 According to the decompression device disclosed in Patent Document 1, the peripheral surface of a part of the decompression camshaft 54 protrudes toward the cam surface 51a, and the cam follower can smoothly run on the decompression camshaft 54, so that the starting operation is smooth. However, since the control lever 55 integrated with the decompression camshaft 54 constitutes a link mechanism together with the centrifugal weight 57, the structure is complicated.
專利文獻2所揭示的減壓裝置，如第8圖所示，是在與凸輪61一體成形的凸輪齒輪62上，設置可擺動的離心配重65，在該離心配重65的軸部64是形成有可面臨於凸輪面61a的開口的缺口部63。這種減壓裝置，在進行起動時，缺口部63的端部63a將會面臨到凸輪面61a上，當起動之後，離心配重65將利用離心力而進行移動，而軸部64進行轉動，缺口部63將會面臨開口，端部63a就會退去。 The pressure reducing device disclosed in Patent Document 2, as shown in Fig. 8, is provided with a swingable centrifugal weight 65 on a cam gear 62 integrally formed with the cam 61, and the shaft portion 64 of the centrifugal weight 65 is A notch portion 63 that can face the opening of the cam surface 61a is formed. In the decompression device, the end portion 63a of the notch portion 63 will face the cam surface 61a when starting, and after starting, the centrifugal weight 65 will be moved by the centrifugal force, and the shaft portion 64 will be rotated, and the notch The portion 63 will face the opening and the end portion 63a will recede.
這種專利文獻2的減壓裝置，雖然零件數目較少，但是凸輪從動件在凸輪面61a上滑動時，凸輪從動件會突然急遽地跨到缺口部63的端部63a上，因此會產 生起動操作不平順的問題。 In the pressure reducing device of Patent Document 2, although the number of parts is small, when the cam follower slides on the cam surface 61a, the cam follower suddenly jumps violently to the end portion 63a of the notch portion 63, so Production The problem of uneven starting operation is unsatisfactory.
[專利文獻1]日本特開平10-159524號公報 [Patent Document 1] Japanese Patent Laid-Open No. Hei 10-159524
[專利文獻2]日本特開平11-81948號公報 [Patent Document 2] Japanese Patent Laid-Open No. Hei 11-81948
本發明是有鑒於前述習知技術的問題點而進行開發完成的，是以提供：起動操作很平順，而且構造簡單的減壓裝置作為本發明的技術課題。 The present invention has been developed in view of the problems of the prior art described above, and provides a pressure reducing device having a smooth starting operation and a simple structure as a technical problem of the present invention.
作為用來解決前述課題的技術方案，本申請案的發明是一種減壓裝置，其在進行起動操作時的壓縮工序中，將會稍微打開吸氣閥以減輕活塞的壓縮阻力，其具備：凸輪齒輪，該凸輪齒輪的其中一面是形成有用來開閉前述吸氣閥的凸輪，在與前述凸輪相反側的另一面是形成有凹部；圓柱狀的減壓凸輪，其被收容在形成於前述凸輪齒輪的凹部並且是朝前述凸輪齒輪的半徑方向延伸的減壓溝內，並且可在前述減壓溝的其中一端的減壓位置與其中另 一端的非減壓位置之間進行移動，在前述減壓位置時，將會從形成在前述凸輪面的開口部往突出到前述凸輪面上，在前述非減壓位置時，將會從前述開口部進行退避；離心配重控制桿，其被設置在前述凸輪齒輪的凹部，並且可以支軸為中心進行擺動；彈簧，其是將前述離心配重控制桿朝向：對抗前述凸輪齒輪旋轉時所產生的離心力的方向進行彈推；在前述凸輪齒輪的凹部形成有弧狀溝，該弧狀溝是與前述減壓溝的半徑方向內側的端部形成直角，並且往前述凸輪齒輪的周方向延伸，在前述離心配重控制桿形成有減壓突起，該減壓突起是嵌入於前述凸輪齒輪的弧狀溝，可因應前述離心配重控制桿的轉動，而將前述減壓凸輪移動到減壓位置與非減壓位置。 As a technical solution for solving the above problems, the invention of the present application is a pressure reducing device which will slightly open the intake valve to reduce the compression resistance of the piston during the compression process at the time of the starting operation, and has a cam a gear, one side of the cam gear is formed with a cam for opening and closing the intake valve, and a recessed portion is formed on the other surface opposite to the cam; and a cylindrical decompression cam is housed in the cam gear formed on the cam gear The recess is also in the decompression groove extending in the radial direction of the aforementioned cam gear, and may be at a decompression position of one end of the aforementioned decompression groove and the other of them Moving between the non-decompressed positions of one end, and protruding from the opening formed in the cam surface to the cam surface at the decompressing position, and from the opening in the non-decompression position The portion is retracted; the centrifugal weight control lever is disposed in the concave portion of the aforementioned cam gear, and is swingable about the pivot shaft; and the spring is configured to face the centrifugal weight control lever toward the rotation of the cam gear In the concave direction of the cam gear, an arcuate groove is formed in a concave portion of the cam gear, and the arcuate groove is formed at a right angle to an end portion in a radial direction of the decompression groove, and extends in a circumferential direction of the cam gear. The centrifugal weight control lever is formed with a pressure reducing protrusion that is an arc groove that is embedded in the cam gear, and can move the pressure reducing cam to a decompression position in response to the rotation of the centrifugal weight control lever. With non-decompression position.
根據前述的技術方案，進行起動時，因為彈簧的彈推力量大於離心力，所以離心配重並不會以支軸為中心進行轉動，而是保持在靜止狀態，離心配重控制桿的減壓突起促使減壓凸輪往減壓位置移動，從凸輪面的開口部突出到凸輪面上。因此，在引擎的壓縮工序中，減壓凸輸將會稍微打開吸氣閥以減輕活塞的壓縮阻力。在引擎起動後的通常運轉狀態時，因為離心力變成大於彈簧的彈推力量，所以離心配重控制桿將會利用離心力而以支軸為中心進行轉動，離心配重控制桿的減壓突起，促使減壓凸輪往非減壓位置移動，而從凸輪面的開口部後退，從凸輪面 上退避。因此，在壓縮工序中，減壓凸輪並不作動，可繼續地進行通常的運轉動作。 According to the foregoing technical solution, when starting, since the spring pushing force is greater than the centrifugal force, the centrifugal weight does not rotate around the fulcrum, but is kept in a stationary state, and the centrifugal weight control rod is decompressed. The decompression cam is caused to move toward the decompressing position, and protrudes from the opening of the cam surface to the cam surface. Therefore, in the compression process of the engine, the pressure relief projection will slightly open the suction valve to reduce the compression resistance of the piston. In the normal operating state after the engine is started, since the centrifugal force becomes greater than the spring pushing force, the centrifugal weight control lever will use the centrifugal force to rotate around the fulcrum, and the centrifugal weight control rod decompression protrusion is promoted. The decompression cam moves toward the non-decompression position, and retreats from the opening of the cam surface, from the cam surface Back off. Therefore, in the compression process, the decompression cam does not operate, and the normal operation can be continued.
更好的構造是，在前述凸輪齒輪的凹部內，形成有：與前述減壓溝的半徑方向外側的端部相連通的弧狀凹部，並且在前述離心配重控制桿上，形成有：嵌入在前述凸輪齒輪的弧狀凹部內，可因應前述離心配重控制桿的轉動而將前述減壓凸輪予以按壓保持在非減壓位置的按壓用突起。根據這種技術方案，在通常的運轉時，離心配重控制桿的按壓用突起是將減壓凸輪按壓保持在非減壓位置，因此，可以防止發生：減壓凸輪因離心力的作用而突出到凸輪面上的情事。 More preferably, in the concave portion of the cam gear, an arcuate recess that communicates with an end portion of the decompression groove in the radial direction outer side is formed, and the centrifugal weight control lever is formed with an embedding In the arcuate concave portion of the cam gear, the pressure reducing cam can be pressed and held by the pressing projection at the non-decompression position in response to the rotation of the centrifugal weight control lever. According to this aspect, in the normal operation, the pressing protrusion of the centrifugal weight control lever holds the pressure reducing cam in the non-decompression position, so that it can be prevented from occurring: the pressure reducing cam protrudes due to the centrifugal force The situation on the cam surface.
更好的構造是，前述離心配重控制桿是具有：可覆蓋住被收容在前述減壓溝內的前述減壓凸輪的形狀。根據這種技術方案，即使沒有另外設置供覆蓋減壓溝用的其他構件，也可以防止被收容在減壓溝內的減壓凸輪從減壓溝離脫。 More preferably, the centrifugal weight control lever has a shape that covers the pressure reducing cam accommodated in the pressure reducing groove. According to this aspect, even if another member for covering the decompression groove is not separately provided, the decompression cam accommodated in the decompression groove can be prevented from being detached from the decompression groove.
根據本發明，在進行起動時，圓柱狀的減壓凸輪的周面的一部分，將會突出到凸輪面上，凸輪從動件將會平順地運行到減壓凸輪軸上，因此，與減壓凸輪的缺口的端部突出到周面上的傳統的減壓裝置相比較，起動操作更為平滑順暢，而且可以減輕起動用拉繩的拉力。因此，即使是老人或是女性也可以很容易將引擎予以起動。 此外，因為是利用離心配重控制桿來直接驅動減壓凸輪，因此，可將減壓凸輪以完全圓柱狀的金屬來製作，構造變得更簡單。 According to the present invention, at the time of starting, a part of the circumferential surface of the cylindrical decompression cam will protrude to the cam surface, and the cam follower will smoothly run to the decompression camshaft, thereby decompressing Compared with the conventional decompression device in which the end of the notch of the cam protrudes to the circumferential surface, the starting operation is smoother and smoother, and the pulling force of the starting pull cord can be reduced. Therefore, even the elderly or women can easily start the engine. Further, since the decompression cam is directly driven by the centrifugal weight control lever, the decompression cam can be made of a completely cylindrical metal, and the structure becomes simpler.
1‧‧‧引擎 1‧‧‧ engine
7‧‧‧凸輪 7‧‧‧ cam
7a‧‧‧凸輪面 7a‧‧‧ cam surface
8‧‧‧凸輪齒輪 8‧‧‧ cam gear
17‧‧‧吸氣閥 17‧‧‧ Inhalation valve
18‧‧‧排氣閥 18‧‧‧Exhaust valve
21‧‧‧減壓裝置 21‧‧‧Reducing device
22‧‧‧凹部 22‧‧‧ recess
23‧‧‧減壓凸輪 23‧‧‧Decompression cam
24‧‧‧離心配重控制桿 24‧‧‧ centrifugal counterweight lever
25‧‧‧彈簧 25‧‧ ‧ spring
28‧‧‧軸部 28‧‧‧Axis
29‧‧‧減壓溝 29‧‧‧Decompression ditch
30‧‧‧弧狀溝 30‧‧‧ arc ditch
31‧‧‧弧狀凹部 31‧‧‧ arc-shaped recess
32‧‧‧開口部 32‧‧‧ openings
39‧‧‧支軸 39‧‧‧ Support shaft
41‧‧‧減壓突起 41‧‧‧Relief protrusion
42‧‧‧按壓用突起 42‧‧‧ Pressing protrusions
第1圖是應用了本發明的減壓裝置的引擎的正面圖。 Fig. 1 is a front view of an engine to which a pressure reducing device of the present invention is applied.
第2圖是第1圖的引擎的閥驅動機構的透視立體圖。 Fig. 2 is a perspective perspective view of the valve drive mechanism of the engine of Fig. 1.
第3圖是減壓裝置的分解立體圖。 Fig. 3 is an exploded perspective view of the pressure reducing device.
第4圖是減壓齒輪的正面圖。 Figure 4 is a front view of the pressure reducing gear.
第5圖是減壓裝置在減壓時(a)與非減壓時(b)的動作圖。 Fig. 5 is an operation diagram of the decompression device at the time of pressure reduction (a) and non-decompression time (b).
第6圖是顯示減壓裝置與引擎的動作工序的關係圖。 Fig. 6 is a view showing the relationship between the operation steps of the decompression device and the engine.
第7圖是傳統的減壓裝置的概略圖。 Fig. 7 is a schematic view of a conventional pressure reducing device.
第8圖是傳統的另一種減壓裝置的概略圖。 Fig. 8 is a schematic view showing another conventional pressure reducing device.
以下，將佐以圖面來說明本發明的實施方式。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
第1圖是應用了本發明的小型四行程引擎1的正面圖，第2圖是閥驅動機構的透視立體圖。正時齒輪5是被固定在收容於汽缸2的下方的曲軸箱3內的曲軸4。在形成於汽缸2的側方的凸輪箱6內，是收容著：與凸輪7一體形成的凸輪齒輪8、以及一對凸輪挺桿9。凸 輪齒輪8是被支承於凸輪軸10，並與正時齒輪5嚙合而被旋轉驅動。一對凸輪挺桿9是可轉動地被設在一個軸11上，並且具有：與凸輪7的凸輪面做滑動接觸的滑動接觸部12、以及可將設在汽缸2的側方的推桿13往上頂的挺桿14。在汽缸2的上方的汽缸頭15，設有一對搖臂16，搖臂16的其中一端係將吸氣閥17與排氣閥18往下按壓，其中另一端則是被推桿13往上頂。 Fig. 1 is a front view of a small four-stroke engine 1 to which the present invention is applied, and Fig. 2 is a perspective perspective view of the valve drive mechanism. The timing gear 5 is a crankshaft 4 that is fixed in a crankcase 3 housed below the cylinder 2. In the cam box 6 formed on the side of the cylinder 2, a cam gear 8 integrally formed with the cam 7 and a pair of cam tappets 9 are housed. Convex The wheel gear 8 is supported by the cam shaft 10 and is rotationally driven by meshing with the timing gear 5. A pair of cam tappets 9 are rotatably provided on a shaft 11, and have a sliding contact portion 12 that is in sliding contact with the cam surface of the cam 7, and a push rod 13 that can be disposed on the side of the cylinder 2 The top tappet 14 is up. In the cylinder head 15 above the cylinder 2, a pair of rocker arms 16 are provided. One end of the rocker arm 16 presses the inhalation valve 17 and the exhaust valve 18 downward, and the other end is pushed up by the push rod 13 .
在凸輪齒輪8的凸輪軸10，安裝著：由捲繞著起動用拉繩的滑輪所構成的手拉式起動器19，手握著安裝在起動用拉繩的端部的手把20來將起動用拉繩予以拉動的話，就會經由凸輪齒輪8、正時齒輪5來使曲軸4進行旋轉，如此一來，就可將引擎1予以起動。在凸輪齒輪8，收容著本發明的減壓裝置21。 The cam shaft 10 of the cam gear 8 is attached with a hand-held starter 19 composed of a pulley around which the starting cord is wound, and the handle 20 attached to the end of the starting cord is held by hand. When the starter pulls the pull cord, the crankshaft 4 is rotated via the cam gear 8 and the timing gear 5, so that the engine 1 can be started. The decompression device 21 of the present invention is housed in the cam gear 8.
第3圖是減壓裝置21的立體圖。減壓裝置21是收容在被設於凸輪齒輪8上的與凸輪7相反側的這一面的圓形凹部22，是由：減壓凸輪23、離心配重控制桿24以及彈簧25所構成的。凸輪齒輪8的凹部22是被外蓋26所覆蓋。 FIG. 3 is a perspective view of the decompression device 21. The decompression device 21 is a circular recess 22 housed on the surface of the cam gear 8 opposite to the cam 7, and is composed of a decompression cam 23, a centrifugal weight control lever 24, and a spring 25. The recess 22 of the cam gear 8 is covered by the outer cover 26.
如第4圖所示，在凸輪齒輪8的凹部22是形成有：從具有與凸輪軸10嵌合的軸孔27的軸部28旁邊朝半徑方向延伸的減壓溝29、朝半徑方向延伸的弧狀溝30、以及弧狀凹部31。 As shown in Fig. 4, the recessed portion 22 of the cam gear 8 is formed by a pressure reducing groove 29 extending in the radial direction from the side of the shaft portion 28 having the shaft hole 27 fitted to the cam shaft 10, and extending in the radial direction. An arcuate groove 30 and an arcuate recess 31.
減壓溝29的寬度是稍微大於減壓凸輪23的直徑，深度則是與減壓凸輪23的長度尺寸大致相同。減 壓溝29的半徑方向外方的端部，是延伸超過凸輪7的凸輪面7a，在凸輪面7a是形成有開口部32。亦即，減壓溝29是與開口部32相連通。開口部32的位置是位於凸輪的上死點與下死點的中間處，並且是設在比較靠近上死點這一側為佳。弧狀溝30的深度是與減壓溝29相同。弧狀溝30的中間部是與減壓溝29的半徑方向內方的端部相連通。因此，弧狀溝30是與減壓溝29形成直角，並且是形成T字形。弧狀溝30的其中一端的寬度是形成比其中另一端的寬度更大。弧狀凹部31的深度是比減壓溝29的深度更淺。弧狀凹部31的其中一端是與減壓溝29的半徑方向外方的端部相連通。 The width of the pressure reducing groove 29 is slightly larger than the diameter of the pressure reducing cam 23, and the depth is substantially the same as the length dimension of the pressure reducing cam 23. Less The outer end portion of the gutter 29 in the radial direction is a cam surface 7a that extends beyond the cam 7, and the cam surface 7a is formed with an opening portion 32. That is, the pressure reducing groove 29 is in communication with the opening portion 32. The position of the opening portion 32 is located at the middle of the top dead center and the bottom dead center of the cam, and is preferably provided on the side closer to the top dead center. The depth of the arcuate groove 30 is the same as that of the decompression groove 29. The intermediate portion of the arcuate groove 30 communicates with the end portion of the pressure reducing groove 29 in the radial direction. Therefore, the arcuate groove 30 is formed at a right angle with the decompression groove 29, and is formed in a T shape. The width of one end of the arcuate groove 30 is formed to be larger than the width of the other end. The depth of the arcuate recess 31 is shallower than the depth of the decompression groove 29. One end of the arcuate recess 31 communicates with an end portion of the decompression groove 29 in the radial direction.
如第3圖所示，在凸輪齒輪8的凹部22是形成有：供離心配重控制桿24的支軸39嵌合用的軸孔33、供裝設彈簧25用的凸部34、供彈簧25的其中一端卡止用的卡止突起35、以及外蓋26的定位用突起36。此外，在凸輪齒輪8的凹部22的內周，是形成有：三個卡止孔37、以及爪部38。 As shown in FIG. 3, in the recessed portion 22 of the cam gear 8, a shaft hole 33 for fitting the support shaft 39 for the centrifugal weight control lever 24, a convex portion 34 for attaching the spring 25, and a spring 25 are formed. The locking projection 35 for locking one end and the positioning projection 36 of the outer cover 26 are provided. Further, on the inner circumference of the concave portion 22 of the cam gear 8, three locking holes 37 and claw portions 38 are formed.
減壓凸輪23是金屬製而且是圓柱形狀，並且具有可被收容在凸輪齒輪8的減壓溝29內的直徑與長度。減壓凸輪23可以在減壓溝29的半徑方向外方的一端的減壓位置、以及在半徑方向內方的另一端的非減壓位置之間進行移動。減壓凸輪23的尺寸大小是形成為：當減壓凸輪23在減壓位置時，是從凸輪面7a的開口部32突出到凸輪面7a上，在非減壓位置時，則從開口部32退 避。 The decompression cam 23 is made of metal and has a cylindrical shape, and has a diameter and a length that can be accommodated in the decompression groove 29 of the cam gear 8. The decompression cam 23 is movable between a decompression position at one end in the radial direction of the decompression groove 29 and a non-decompression position at the other end in the radial direction. The size of the decompression cam 23 is such that when the decompression cam 23 is at the decompression position, it protrudes from the opening 32 of the cam surface 7a to the cam surface 7a, and when it is not at the decompression position, from the opening 32 Retreat avoid.
離心配重控制桿24是略呈C字形，在其中一端是具有嵌合到凸輪齒輪8的軸孔33的支軸39，在其中另一端則是形成有供彈簧25卡止用的缺口40。離心配重控制桿24是被設置成：藉由將支軸39嵌合在凸輪齒輪8的軸孔33，而能夠以支軸39為中心進行擺動。在離心配重控制桿24之與凸輪齒輪8的凹部22相對向的面，是與支軸39的軸心保持平行地突設有：用來嵌入凸輪齒輪8的弧狀溝30的減壓突起41、以及面對於凸輪齒輪8的弧狀凹部31的按壓用突起42。雖然減壓突起41的高度是與弧狀溝30的深度大致相同，但是，按壓用突起42的高度則是低於減壓突起41，並且是與弧狀凹部31的深度大致相同。 The centrifugal weight control lever 24 is slightly C-shaped, and has a support shaft 39 having a shaft hole 33 fitted to the cam gear 8 at one end, and a notch 40 for locking the spring 25 at the other end. The centrifugal weight control lever 24 is provided to be swingable about the support shaft 39 by fitting the support shaft 39 to the shaft hole 33 of the cam gear 8. The surface of the centrifugal weight control lever 24 opposed to the concave portion 22 of the cam gear 8 is protruded in parallel with the axial center of the support shaft 39: a decompression projection for inserting the arcuate groove 30 of the cam gear 8 41. A pressing protrusion 42 that faces the arcuate recess 31 of the cam gear 8. Although the height of the decompression protrusion 41 is substantially the same as the depth of the arcuate groove 30, the height of the pressing protrusion 42 is lower than the decompression protrusion 41, and is substantially the same as the depth of the arcuate recess 31.
減壓突起41的外方的端面，是具有可對於減壓凸輪23產生凸輪作用的功能。如第5圖所示，離心配重控制桿24是可在：朝中間部接近凸輪齒輪8的軸部28的方向轉動後的初期位置、以及朝中間部離開凸輪齒輪8的軸部28的方向轉動後的作動位置之間進行移動。並且是製作成：在初期位置時，減壓突起41是將減壓凸輪23推出到減壓位置，按壓用突起42則是從減壓凸輪23退避。在作動位置時，減壓突起41促使減壓凸輪23退避到非減壓位置，並且按壓用突起42是將減壓凸輪23按壓保持在非減壓位置。 The outer end surface of the decompression projection 41 has a function of generating a cam action on the decompression cam 23. As shown in Fig. 5, the centrifugal weight control lever 24 is an initial position in which the intermediate portion is rotated in the direction of approaching the shaft portion 28 of the cam gear 8, and a direction away from the shaft portion 28 of the cam gear 8 toward the intermediate portion. Move between the rotated positions. Further, in the initial position, the decompression projection 41 pushes the decompression cam 23 to the decompression position, and the pressing projection 42 retreats from the decompression cam 23. At the actuating position, the decompression protrusion 41 urges the decompression cam 23 to retract to the non-decompression position, and the pressing protrusion 42 presses and holds the decompression cam 23 at the non-decompression position.
離心配重控制桿24是被形成：當其在初期位 置與作動位置進行移動的期間，利用其前端部附蓋著減壓溝29。因此，即使沒有另外設置供覆蓋減壓溝29用的其他構件，也可以防止被收容在減壓溝29內的減壓凸輪23從減壓溝29離脫。 The centrifugal weight lever 24 is formed: when it is in the initial position The pressure reducing groove 29 is attached to the front end portion while the movement position is being moved. Therefore, even if the other member for covering the decompression groove 29 is not separately provided, the decompression cam 23 housed in the decompression groove 29 can be prevented from being detached from the decompression groove 29.
如第3圖所示，彈簧25是扭力彈簧，且裝設在凸輪齒輪8的凸部34。彈簧25的其中一端是卡止在離心配重控制桿24的缺口40，其中另一端是卡止在凸輪齒輪8的凹部22的卡止突起35。藉此，彈簧25就可以朝向：對抗凸輪齒輪8旋轉時作用在離心配重控制桿24的離心力的方向(第5圖(a)中，以f所表示的方向)，亦即，將離心配重控制桿24朝向初期位置進行彈推，並且將減壓凸輪23朝向減壓位置進行彈推。 As shown in FIG. 3, the spring 25 is a torsion spring and is attached to the convex portion 34 of the cam gear 8. One end of the spring 25 is a notch 40 that is locked to the centrifugal weight control lever 24, and the other end is a locking projection 35 that is locked in the recess 22 of the cam gear 8. Thereby, the spring 25 can be oriented toward the direction of the centrifugal force of the centrifugal weight control lever 24 when the cam gear 8 rotates (the direction indicated by f in Fig. 5(a)), that is, the centrifugal fitting The heavy control lever 24 is pushed toward the initial position, and the decompression cam 23 is pushed toward the decompression position.
如第3圖所示，外蓋26是用來覆蓋住凸輪齒輪8的凹部22，是形成有：供凸輪齒輪8的軸部28嵌合用的中心孔43、供離心配重控制桿24的支軸39嵌合用的軸孔44、供凸部34嵌合用的孔45、供定位用突起36嵌合用的定位孔46。在外蓋26的周緣，形成有：用以卡止在凸輪齒輪8的三個卡止孔37的三個爪片47、供凸輪齒輪8的爪部38卡止用的缺口48。 As shown in Fig. 3, the outer cover 26 is a recess 22 for covering the cam gear 8, and is formed with a center hole 43 for fitting the shaft portion 28 of the cam gear 8, and a branch for the centrifugal weight control lever 24. The shaft hole 44 for fitting the shaft 39, the hole 45 for fitting the convex portion 34, and the positioning hole 46 for fitting the positioning projection 36. On the periphery of the outer cover 26, three claw pieces 47 for locking the three locking holes 37 of the cam gear 8, and a notch 48 for locking the claw portions 38 of the cam gear 8 are formed.
其次，說明具有前述的結構的減壓裝置21的作用。 Next, the action of the decompression device 21 having the above-described configuration will be described.
在引擎1停止的狀態下，為了利用手拉式起動器19來起動引擎1，抽拉起動用拉繩來使凸輪軸10進行旋轉的話，凸輪齒輪8就會進行旋轉，透過正時齒輪5 使得曲軸4進行旋轉，活塞就會作動。如第6圖所示，當活塞2a在反覆執行：吸氣、壓縮、膨脹、排氣的四個行程工序的期間，利用點火線圈使火星塞進行點火，引擎1就進行起動。 In a state where the engine 1 is stopped, in order to start the engine 1 by the hand starter 19 and pull the starting pull cord to rotate the cam shaft 10, the cam gear 8 rotates, and the timing gear 5 is transmitted. The crankshaft 4 is rotated and the piston is actuated. As shown in Fig. 6, when the piston 2a repeatedly performs four strokes of suction, compression, expansion, and exhaust, the spark plug is ignited by the ignition coil, and the engine 1 is started.
當要啟動引擎1時，利用手拉式起動器19所做的手動操作，凸輪齒輪8將會進行進行旋轉，因此，如第5圖(a)所示，作用在被收容於凸輪齒輪8的離心配重控制桿24上的離心力F很小。因此，離心配重控制桿24的彈簧25所作用的彈推力f是大於離心配重控制桿24的離心力F，因此，離心配重控制桿24將會靜止在初期位置。離心配重控制桿24的減壓突起41將減壓凸輪23推出到減壓位置，減壓凸輪23將會從凸輪面7a的開口部32(請參考第3圖)突出到凸輪面7a上。其結果，將如第6圖所示，在引擎1的壓縮工序中，凸輪挺桿9的滑動接觸部12將會跨在減壓凸輪23上，凸輪挺桿9將進行轉動，凸輪挺桿9的挺桿14會將推桿13往上頂起，搖臂16將會作動，吸氣閥17將會稍微打開，活塞2a的壓縮阻力就會減輕。 When the engine 1 is to be started, the cam gear 8 is rotated by the manual operation by the hand starter 19, and therefore, as shown in Fig. 5(a), acts on the cam gear 8 The centrifugal force F on the centrifugal weight control lever 24 is small. Therefore, the spring force f of the spring 25 of the centrifugal weight control lever 24 is larger than the centrifugal force F of the centrifugal weight control lever 24, and therefore, the centrifugal weight control lever 24 will be at the initial position. The decompression projection 41 of the centrifugal weight control lever 24 pushes the decompression cam 23 to the decompression position, and the decompression cam 23 projects from the opening 32 of the cam surface 7a (please refer to FIG. 3) to the cam surface 7a. As a result, as shown in Fig. 6, in the compression process of the engine 1, the sliding contact portion 12 of the cam tappet 9 will straddle the decompression cam 23, and the cam tappet 9 will rotate, the cam tappet 9 The tappet 14 will push the push rod 13 up, the rocker arm 16 will actuate, the suction valve 17 will be slightly opened, and the compression resistance of the piston 2a will be reduced.
減壓凸輪23是完全的圓柱狀，並不具有傳統裝置的那種缺口。因此，凸輪挺桿9的滑動接觸部12可以很平滑順暢地從凸輪面7a運行到減壓凸輪23上。不會有卡住不順暢的感觸傳遞到抽拉手拉式起動器19的起動用拉繩的使用者，即使是老人或女性也可以平滑順暢地執行利用手拉式起動器19的起動操作。 The decompression cam 23 is completely cylindrical and does not have the notch of the conventional device. Therefore, the sliding contact portion 12 of the cam tappet 9 can smoothly and smoothly travel from the cam surface 7a to the decompression cam 23. The user who has not caught the unsatisfactory feeling is transmitted to the user who pulls the starting pull cord of the hand pull starter 19, and the starting operation by the hand puller 19 can be smoothly and smoothly performed even by an elderly person or a woman.
引擎1起動之後，開始進行通常的運轉的話，凸輪齒輪8的旋轉數會上昇，作用在離心配重控制桿24的離心力F會變大。因此，離心力F會變成大於彈簧25的彈推力f，離心配重控制桿24就會因受到離心力F而以支軸39為中心進行轉動，從初期位置移動到作動位置。如此一來，離心配重控制桿24的減壓突起41將減壓凸輪23推出到減壓位置的力量就消失了，而使得減壓凸輪23移動到非減壓位置。其結果，減壓凸輪23將會從凸輪面7a的開口部32(請參考第3圖)往後退，而從凸輪面7a上退避下去。因此，在壓縮工序中，減壓凸輪23並不作動，而持續進行通常的運轉動作。離心配重控制桿24移動到作動位置的話，按壓用突起42會將減壓凸輪23按壓保持在非減壓位置，所以能夠防止發生：減壓凸輪23因受到離心力而突出到凸輪面7a上的情事。此外，藉由改變離心配重控制桿24的重量或重心的位置，或者藉由改變彈簧25的彈性係數，來調整離心配重控制桿24的離心力以及彈簧25的彈推力，即可調整減壓凸輪23所執行的減壓機構的解除時期。 When the normal operation is started after the engine 1 is started, the number of rotations of the cam gear 8 increases, and the centrifugal force F acting on the centrifugal weight control lever 24 increases. Therefore, the centrifugal force F becomes larger than the spring force f of the spring 25, and the centrifugal weight control lever 24 is rotated about the support shaft 39 by the centrifugal force F, and moves from the initial position to the actuating position. As a result, the decompression projection 41 of the centrifugal weight control lever 24 releases the force of pushing the decompression cam 23 to the decompression position, and the decompression cam 23 is moved to the non-decompression position. As a result, the decompression cam 23 will retreat from the opening 32 of the cam surface 7a (please refer to FIG. 3) and retreat from the cam surface 7a. Therefore, in the compression process, the decompression cam 23 does not operate, and the normal operation operation is continued. When the centrifugal weight control lever 24 is moved to the actuating position, the pressing projection 42 presses and holds the pressure reducing cam 23 at the non-decompression position. Therefore, it is possible to prevent the pressure reducing cam 23 from protruding to the cam surface 7a due to the centrifugal force. The situation. Further, the pressure can be adjusted by changing the weight of the centrifugal weight control lever 24 or the position of the center of gravity, or by changing the spring constant of the spring 25 to adjust the centrifugal force of the centrifugal weight control lever 24 and the spring force of the spring 25. The release timing of the pressure reducing mechanism performed by the cam 23.
當引擎1停止的話，作用在離心配重控制桿24的離心力就會消失，彈簧25的彈推力就成為主宰，離心配重控制桿24將受到彈簧25的彈推力而移動到第5圖(a)所示的初期位置。此時，離心配重控制桿24的減壓突起41，會將減壓凸輪23推出到減壓位置，使得減壓凸輪23從凸輪面7a的開口部32(請參考第3圖)突出到凸輪面 7a上，而恢復到與起動時相同的狀態。 When the engine 1 is stopped, the centrifugal force acting on the centrifugal weight control lever 24 disappears, the spring thrust of the spring 25 becomes dominant, and the centrifugal weight control lever 24 is moved by the spring force of the spring 25 to Fig. 5 (a ) The initial position shown. At this time, the decompression projection 41 of the centrifugal weight control lever 24 pushes the decompression cam 23 to the decompression position, so that the decompression cam 23 protrudes from the opening 32 of the cam surface 7a (please refer to FIG. 3) to the cam. surface On 7a, it returns to the same state as when it was started.
因為是以這種方式，利用離心配重控制桿24的減壓突起41直接驅動減壓凸輪23，所以不必在減壓凸輪23上，一體地形成有傳統裝置中的那種控制桿，減壓凸輪23可以採用完全圓柱狀的金屬製，因此構造變得更簡單。 Since the decompression cam 41 of the centrifugal weight control lever 24 directly drives the decompression cam 23 in this manner, it is not necessary to integrally form the lever in the conventional apparatus on the decompression cam 23, and decompress. The cam 23 can be made of a completely cylindrical metal, so that the construction becomes simpler.
此外，本發明並不侷限在前述的實施方式，亦可做各種的改變。在前述的實施方式中，雖然是製作成：在離心配重控制桿24上設置按壓用突起42，以將減壓凸輪23按壓保持在非減壓位置，但也不一定要設置這種按壓用突起42。這是因為在進行通常的運轉時，即使假定減壓凸輪23突出到凸輪面7a上，也會因為凸輪挺桿9的滑動接觸部12按壓著減壓凸輪23，使其退避到非減壓位置，因而無法讓減壓凸輪23發揮減壓功能的緣故。但是，基於可確實地促使減壓凸輪23退避到非減壓位置的考量，還是設置有按壓用突起42比較好。 Further, the present invention is not limited to the foregoing embodiments, and various changes can be made. In the above-described embodiment, the pressing protrusion 42 is provided on the centrifugal weight control lever 24 to press and hold the pressure reducing cam 23 in the non-decompression position. Protrusion 42. This is because, even when the normal operation is performed, even if it is assumed that the decompression cam 23 protrudes onto the cam surface 7a, the sliding contact portion 12 of the cam tappet 9 presses the decompression cam 23 to retreat to the non-decompression position. Therefore, the decompression cam 23 cannot be made to function as a decompression function. However, it is preferable to provide the pressing protrusion 42 based on the consideration that the decompression cam 23 can be reliably retracted to the non-decompression position.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-164666 | 2014-08-13 | ||
| JP2014164666A JP6386290B2 (en) | 2014-08-13 | 2014-08-13 | Engine decompression device |
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| Publication Number | Publication Date |
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| TW201606180A TW201606180A (en) | 2016-02-16 |
| TWI656278B true TWI656278B (en) | 2019-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| TW104125935A TWI656278B (en) | 2014-08-13 | 2015-08-10 | Engine pressure reducing device |
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| JP (1) | JP6386290B2 (en) |
| CN (1) | CN105370339B (en) |
| TW (1) | TWI656278B (en) |
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| WO2020008611A1 (en) * | 2018-07-05 | 2020-01-09 | 本田技研工業株式会社 | Engine decompression device and engine |
| CN113153480B (en) * | 2021-06-08 | 2022-11-29 | 含山县大颉机械有限公司 | Engine camshaft pressure reducing mechanism |
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|---|---|---|---|---|
| CN102777227A (en) * | 2011-05-12 | 2012-11-14 | 江苏林海动力机械集团公司 | Decompression device of engine |
| CN203403921U (en) * | 2013-07-26 | 2014-01-22 | 重庆润通动力制造有限公司 | Engine pressure reduction device |
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|---|---|---|---|---|
| JPS5141973Y2 (en) * | 1972-09-04 | 1976-10-13 | ||
| AT364960B (en) * | 1977-06-23 | 1981-11-25 | List Hans | DECOMPRESSION DEVICE FOR INTERNAL COMBUSTION ENGINES |
| JPH02135611U (en) * | 1988-12-28 | 1990-11-13 | ||
| JP3366198B2 (en) * | 1996-11-29 | 2003-01-14 | 本田技研工業株式会社 | Engine decompression mechanism |
| JP3450996B2 (en) * | 1997-09-11 | 2003-09-29 | 富士ロビン株式会社 | Engine decompression device |
| JP2003301704A (en) * | 2002-04-08 | 2003-10-24 | Honda Motor Co Ltd | Internal combustion engine provided with decompressing means |
| US20040003791A1 (en) * | 2002-07-08 | 2004-01-08 | Giuseppe Ghelfi | Compression release mechanism |
| CN2628732Y (en) * | 2003-06-03 | 2004-07-28 | 重庆市祥陵汽车配件有限公司 | Universal gasoline engine starting decompressing apparatus |
| JP4180447B2 (en) * | 2003-06-04 | 2008-11-12 | 本田技研工業株式会社 | Decompression device for internal combustion engine |
| JP4234653B2 (en) * | 2004-09-03 | 2009-03-04 | ヤマハ発動機株式会社 | Engine decompression device |
| CN201334932Y (en) * | 2008-12-31 | 2009-10-28 | 三阳工业股份有限公司 | Engine pressure-relief device |
-
2014
- 2014-08-13 JP JP2014164666A patent/JP6386290B2/en not_active Expired - Fee Related
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- 2015-08-10 TW TW104125935A patent/TWI656278B/en not_active IP Right Cessation
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777227A (en) * | 2011-05-12 | 2012-11-14 | 江苏林海动力机械集团公司 | Decompression device of engine |
| CN203403921U (en) * | 2013-07-26 | 2014-01-22 | 重庆润通动力制造有限公司 | Engine pressure reduction device |
Also Published As
| Publication number | Publication date |
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| CN105370339B (en) | 2019-04-12 |
| JP2016040459A (en) | 2016-03-24 |
| TW201606180A (en) | 2016-02-16 |
| CN105370339A (en) | 2016-03-02 |
| JP6386290B2 (en) | 2018-09-05 |
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