TWI274118B - Ratchet type tensioner - Google Patents

Abstract

The present invention relates to a ratchet type tensioner for preventing the locking state of the plunger and realizing the smoothness of the plunger and accurate motion thereof so as to reduce the defect rates while increasing the productivity of the tensioner. The ratchet type tensioner comprises a plunger piston inserted in the embracing hole of the casing and the front is outside the hole, a ratchet setting in the ratchet shaft which can swing freely, making the click and the ratchet gear engaged to prevent the plunger piston back, characterized in that said ratchet has the first click in the vertical line through the ratchet center, engaged with the plunger piston; when the first click engaged with the plunger, the second click enters the space between two adjacent ratchet gear in the vertical line through the ratchet shaft center; besides, the projecting value of the second click from the ratchet shaft center to the vertical line is shorter than the made tolerance range, so to prevent the locking state of the plunger because the second click engaged with the ratchet.

Description

274118 Further, in the tensioner case 7, the ratchet cymbal 6-axis support and the ratchet shaft cymbal 15' are swingably formed in the ratchet wheel A6 to form the cymbal ratchet pawl 7 and the second ratchet pawl 18' such as о 3 The ratchet teeth are placed on the side of the plunger Α8. The ratchet cymbal 16||by the ratchet spring α19, which is placed between it and the tensioner housing 7, is often applied to the ratchet wheel αι5 in the direction in which the ratchet pawls 17, Αΐ8 and the ratchet wheel f of the plunger Α8 are combined. The rotation of the dust force is mainly caused by the first ratcheting pawl 17 and the ratchet tooth τ to prevent the displacement of the plunger 之后 8 in the backward direction. * The second ratchet pawl 18 is added to increase the amount of backlash. (The first ratchet pawl A17 is formed by the forward displacement of the plunger A8 from the position where the ratchet tooth τ is merging, and becomes adjacent to the /m±±u ratchet 1). The tensioning device of the ratcheting claw is disclosed, for example, in Japanese Patent Application Laid-Open No. Hei. No. Hei. No. Hei. No. Hei. No. Hei.

The pulsation of the impact tension of the chain A6 is divided into a high pressure chamber H in the plunger receiving hole A1: and the hollow portion A3 of the plunger A8.

(3) The external supply oil LF is generated by the oil passage A2G and the ball check valve, and is flushed through the tensioner rod A10 from the chain A6 side to the front end of the plunger A8, and the plunger A8 is within the range of the backlash. Back. At this time, the sound in the sound; 懕 & Hi is compressed and the pressure rises abruptly, and the ball check valve A21 causes the opening of the ball y seat A23 to be stopped. 2 plugs the ball that is in communication with the oil passage A2. As a result, the oil pressure in the high pressure chamber H rises more, and leaks from the fine gap between the outer peripheral surface of the plunger 8 8 and the inner peripheral surface of the plunger receiving hole _ 2 to Tensioning the outside of the salty A7, the impact force acting on the column base A8 is buffered by the flow impedance of the generated oil. ^The use of (four), the chain A6 stretches, the plunger A8 exceeds the backlash of the backlash and shifts in the direction of the protrusion, then the first "朿 wheel ai7 and the second will be divided into four (four) (four) gear teeth η 'tensioner rod - Squeezed by the column I and the swaying of the 醏 醏 现 现 现 现 现 现 。 。 。 。 。 。 SUMMARY OF THE INVENTION The conventional ratchet L m 〇 ^ 1 to the wheel type tension Is, as shown in FIG. 3, is in the first ratchet pawl A17, and is diagnosed by a special person such as a ratchet tooth T. In the state, the second ratchet pawl A18 is Φ, η passing through the ratchet shaft A15. t ,

The %0 and the line N perpendicular to the axis of the plunger A8 are combined with the ratchet teeth, and the amount of protrusion of the first ratchet claw A17 along the vertical line of the center of your 兮 攸 亥 亥The amount of protrusion S2, ' of the ratchet pawl A18 is made substantially the same within the manufacturing tolerance range. However, even if the amount of protrusion S2' is greater than the amount of protrusion y $丄ntfc 1 in the case where the amount of protrusion S2' is larger than the difference, the second ratchet pawl A18 and the adjacent two ratchet teeth Between the τ, the teeth are not, the feng & j ^, and the bottom interfere with each other, and as a result, the plunger A 8 is locked. Moreover, if the plunger - B ifb / ^ · is broken, the tensioner lever A1 cannot be stretched to follow the extension of the chain A6, and there is a problem that the function of the buckle is tight and the tension is tight. On the other hand, in order to avoid the aforementioned problems, if the first ratchet claw is to be used

The protrusion amount S1 of the A17 and the protrusion amount S2 of the 9th wire 〆A music Z ratchet pawl A18 are made to be highly accurate, and the productivity of the tensioner is lowered because of the need, the Kagu, and the requirement for the accuracy of the parts. The problem. 1274118 The second of the claws A18 is such that the amount of protrusion S1 of the first ratchet pawl A17 and the amount of the dog of the second ratchet are made to be exactly equal, if the tension is: the second plunger receiving hole Ai2, and the plunger The ratchet tooth τ of A8 is engraved with a slight gap between the two sides, the fine Δ 8 contained in the lubricating oil, the wear metal powder generated by the sliding part, etc., due to the plunger =, (four) wheel A16#j top Therefore, the second ratchet pawl Au will interfere with the tooth bottom of the ratchet tooth 1 and will be in a state in which the plunger Α 8 is locked. The purpose of the present invention is to provide a ratchet type tensioner to prevent the interference between the ratchet pawl and the ratchet teeth when the plunger exceeds the range of the backlash, and the 棘 2 ratchet pawl generated during the manufacture of the tensioner. The deviation caused by the deviation of the amount of the protrusion and the dryness of the ratchet pawl or the wear of the metal powder in the plunger receiving hole or the like causes the plunger to be locked, thereby achieving a smooth and sure action of the plunger and reducing the defect rate. Improve the productivity of the tensioner. In order to achieve the above object, the ratchet type tensioner of the present invention comprises: a plunger slidably inserted into the plunger receiving hole of the tensioner case, and is spring-embossed so that the front end portion protrudes outside the receiving hole And a ratcheting manner is supported by a ratchet shaft disposed on the tensioner housing; a ratcheting pawl that is formed = the ratchet is engaged with a ratchet tooth engraved on the side of the plunger to prevent the plunger from retreating, The ratchet wheel has a first ratchet pawl that meshes with a ratchet tooth of the plunger at a position offset from a position on a vertical line passing through a center of the ratchet shaft toward a distal end side of the plunger; and a second ratchet pawl The first ratchet pawl and the ratchet teeth of the plunger. The state of the toothed joint is invaded in the position of 1274118 near the vertical line passing through the center of the ratchet shaft; the output S2' in the vertical direction from the center of the ratchet shaft is offset from the position toward the front end side of the plunger The protrusion tsl of the ratcheting claw 1 is set to have a short tolerance range in manufacturing: the column of the plunger that is prevented from being injected by the second ratchet pawl and the ratchet tooth is prevented from being protruded. The plug _ will apply a suitable tension to prevent slack or vibration during walking. The second: 'The tensioner shell is only from the position where the 朿 朿 朿 与 与 与 与 与 与 与 与 与 与 与Below the rear - the backlash of the ratchet teeth can move forward and backward following the tension of the chain. People and p 2 brother ratchet claws 'stop the retreat when the plunger smashes from the first ratchet pawl and the ratchet teeth σ When the position is slightly advanced, the ratchet tooth abuts, and the ratchet wheel is pushed by the ratchet tooth. When the ratchet wheel is swung around the ratchet shaft, the ratchet pawl is removed from the ratchet tooth. Also, the second ratchet pawl is not matched from the present. The range of the ratchet teeth leaves, the tension of the right chain rises, making the column The plug is pushed back against the force of the bomb, and the ratchet is swung back to the original state by the first ratchet pawl meshing with the ratchet teeth. The splicing of the ratchet teeth of the plug is moved by the plunger from the working ratchet pawl The amount of backlash of the plunger to the second ratchet pawl is increased to prevent the excessive tension from being applied to the chain during walking. On the other hand, the surface 'stretches with time by the chain' if the plunger exceeds the eve of the backlash amount' The second ratchet claws and the ratchet teeth move away. The i-th ratchet claws are combined with the lower-back ratchets (four) to prevent the plunger from retreating to the rear. The new muzzle 1274118 the second ratchet claw front end, at the ratchet Swinging along the ratchet shaft to the position closest to the bottom of the ratchet teeth, still leaving a small gap between the bottom of the ratchet teeth, does not interfere with the two, and the plunger is not locked. [Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view of an essential part showing an embodiment of the present invention, and the ratchet 1 of the ratchet type tensioner is used in the prior art. Similarly, the shaft hole 4 is externally fitted to the ratchet fixed to the tensioner case 2 The shaft 3 supports the ratchet wheel so as to be swingable about the ratchet shaft 3. Further, in the ratchet 1, the i-th ratchet pawl 6 and the second ratchet pawl 7 are disposed and respectively sprayed on the plunger 5 $β ^ \ Most of the ratchet teeth that are engraved along the axis in one part of the outer surface of the violent smash. -w not trapped in the plunger receiving hole (opening the mouth outside the tensioner case 2), by not shown The plunger spring is often biased in the direction in which the tensioner housing 2 protrudes. Further, the ratchet 1 abuts against the ratchet spring 9 with the spring receiving surface 1 (inserted into: the tensioner housing 2 is formed The spring retaining hole 8 is held) the end portion 'the rotational force is applied clockwise by the ratchet of the ratchet spring 9. The first ratchet pawl 6 is attached to the ratchet shaft. The vertical spur of the center of the cymbal 3: the position is shifted to the position of the protruding end side of the plunger 5 by the distance a; the: '' again' at the $1 ratchet pawl 6 and the ratchet teeth fully engaged, =7 The front end is passing through the center. On the straight line N of the axis of the plunger 5, it intrudes into the adjacent two ratchet teeth and faces the tooth bottom 1274118 b. Further, as shown in FIG. 1, the amount of protrusion S of the first ratchet pawl 6 which is offset from the projecting end side of the plunger 5 by the distance 3 is lifted from the center of the ratchet shaft 3 in the direction of the vertical line N. The amount of protrusion of the second ratchet pawl 7 is set to be short in the manufacturing range so that a slight gap is formed between the front end of the second ratchet pawl 7 and the tooth bottom b of the ratchet tooth T. In the above configuration, the front end of the second ratchet pawl 7 is swung in the ratchet shaft 3 along the ratchet shaft 3 to make the first! Near the position where the ratchet pawl 6 and the ratchet tooth are fully salivated, although it is closest to the tooth bottom b of the ratchet tooth τ, at this position, the rainer does not interfere and the entanglement occurs, and the key is Zhang Qiqi, Shi #t The tension of the cymbal is weakened to the right, and the plunger 5 is such that the wheel 1 is centered on the ratchet shaft 3" vl. - when the oscillating side of the hour hand moves toward the protruding direction and 'when the plunger 5 is subjected to an impact, in order to relax it, it is preferable to assemble the hydraulic buffering mechanism using the ball as shown in FIG. 2 in the interior of the tensioning shell 2, It can also be simplified by the provincial government. According to the invention, the second ratchet pawl is in the state of the ratchet wheel I, in the state of the ratchet wheel I, and the ratchet wheel of the column base is in the state of passing the ratchet shaft: ^ axis vertical The position near the straight line invades the adjacent Seri S2, and the travel range is shorter than the i-th ratchet, if (4). ::: The amount of protrusion S2 of the two ratchet pawls A18 is made in the ☆ 差 差 差 差 差 差 差 差 差 差 差 差 差 差 差Tensioner 11 J274H8 The deviation of the protrusion amount 52 of the second ratchet pawl generated during the manufacturing process is caused by the interference with the ratchet teeth. Therefore, the second ratchet claw can be prevented from being caught in the ratchet teeth and the column is locked. The state can reduce the defect rate. Further, by setting the amount of protrusion S2' of the second ratchet in the vertical direction from the center of the ratchet shaft to the amount of protrusion of the i-th ratchet pawl, the tolerance range is short, as is known from the prior art. Comparing the amount of protrusion S1 of the first "朿 pawl Ai7 with the amount of protrusion S2 of the second ratchet pawl A18, making a ratchet type tensioner of approximately the same tolerance range in manufacturing, even if the i-th ratchet pawl is The protrusion of the second ratchet pawl - ^^^, the degree of the flat valley is a certain degree, because the plunger can be prevented from being locked, the productivity of the tensioner can be improved, and the month & The manufacturing cost of the tensioner.

2° before the spine = 2nd in the vertical direction from the center of the ratchet shaft: S2 of the wheel, compared to the manufacturing tolerance range of the U-th, even if the S1 δ is engraved with ratchet in m The plunger receiving hole other than the opposite side of the flank and the fine gap between the surface of the oil contained in the oil, penetrate into the lubricating oil household "foreign matter (the engine slides, etc.), and the axis of the plunger The ratchet side of the top to the 1 grinding metal will bite into the ratchet teeth without: the ratchet claws are not [simplified illustration] become the state of being locked. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view of a main portion of a preferred embodiment of the present invention. Fig. 2 is a view showing a conventional ratcheting tension line. Figure 3 is a cross-sectional view of a conventional example of the spine. The component represents the symbol of the symbol. 12 1274118 1 Ratchet 2 Tensioner housing 3 Ratchet shaft 4 Shaft hole 5 Plunger 6 1st ratchet pawl 7 2nd ratchet pawl

8 Spring holding hole 9 Ratchet spring 10 Elastic bearing surface 51 The amount of protrusion of the first ratchet claw 52 The amount of protrusion of the second ratchet claw

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Claims (1)

1274118 Pickup, patent application scope: Mountain 1. A ratchet type tensioner is provided with a plunger that is inserted into a plunger receiving hole of a tensioner shell by a sliding side, and is spring-embossed into a front end portion. The ratchet wheel is pivotally supported by the ratchet shaft disposed on the tensioner housing; the ratchet pawl formed on the ratchet is engaged with the ratchet teeth engraved on the side of the plunger to block the column The plug moves back and is characterized by: 〃 s hai ratchet has: the first ratchet pawl, at a position offset from the vertical cymbal passing through the center of the ratchet shaft toward the end of the plunger, and the ratchet of the plunger φ tooth engagement; and the second ratchet pawl 'in the state of the 帛"the yoke engaging the ratchet teeth of the plunger, invading between two adjacent ratchet teeth located near the vertical line passing through the center of the ratchet shaft; The protrusion 4 S2 of the second ratchet pawl in the vertical direction from the center of the ratchet shaft is set to a shorter manufacturing tolerance range than the protrusion amount S of the first ratchet pawl displaced to the tip end side of the plunger To avoid the injection of 帛2 #朿 wheel and ratchet teeth The resulting plunger is locked in state. 0 壹, pattern: as the next page 14