CN202659296U - Pressure reducing device for engine - Google Patents

Abstract

The utility model relates to a pressure reducing device for an engine. The device can be applied to an underlying camshaft type engine and is low in application cost. The device comprises an underlying camshaft, a lower rocker arm, an unidirectional isolator, a clamping part, a decompression cam and a stopping component, wherein the underlying camshaft is arranged on a crankshaft box body and provided with an inlet cam, an exhaust cam and a timing gear; the unidirectional isolator is arranged on the camshaft, and the clamping part is convexly arranged on the periphery of the unidirectional isolator; the decompression cam and the unidirectional isolator are integrally arranged, and the decompression cam is used for reducing pressure of a combustion chamber; and the stopping component is installed on an inner wall of the engine on one side closest to the decompression cam. When the camshaft rotates positively, the camshaft is clamped with the clamping part, so that the motion of the decompression cam can be stopped.

Description

The decompressor of motor

Technical field

The utility model relates to a kind of decompressor of motor, it is arranged on the casing of motor with lower arranging cam axle, the torque of counter-rotating turning crankshaft to the impact of motor corresponding part and when reducing engine start when this decompressor reduces engine stop.

Background technique

The decompressor of known a kind of motor, when engine stop, engine inversion makes mechanism of decompressor rotation and ejection intake valve or the exhaust valve that is installed on the camshaft, reduce chamber pressure, thereby the torque (for example, with reference to patent documentation 1) of turning crankshaft when reducing engine inversion to the impact of motor corresponding part and reducing next starting.

Patent documentation 1: publication number is the Chinese patent of CN101080553A.

In this patent documentation 1, the decompressor of motor comprises camshaft, the mechanism of decompressor and stop mechanism, and camshaft and the mechanism of decompressor be disposed on cylinder head (also being cylinder head) and the camshaft holder, and stop mechanism are installed on the camshaft holder together.But such decompression mechanism in engine that is comprised of camshaft, the mechanism of decompressor and stop mechanism, its setting position be cylinder head or its relevant position normally, and its Applicable scope is overhead cam engine.And on camshaft underneath type motor, namely camshaft is installed on the crankcase body, and intake and exhaust cam is controlled by lower shake-changing arm, valve tappet, valve rocker on the motor of inlet and outlet door, and the relevant mechanism of decompressor is never used to some extent.

And on the present Chinese market, a large amount of camshaft underneath type motors are applied on the product such as three-wheel loading motorcycle, the requirement discharge capacity is large, corresponding power, moment of torsion increases, and such motor has not arranged the corresponding mechanism of decompressor for a long time, so that when engine stop, engine crankshaft reverses because of the pressure of firing chamber, to motor corresponding part such as electric activation member, the connnecting rod big end needle roller produces impact force and affects its normal working life, the locking of magnetogenerator free wheel device particularly appears, the situation such as fall apart, make this class breakdown in the motor frequent, and then affect the normal use of motor.In addition, on this class motor the mechanism of decompressor is not set, the existence of internal pressure of combustion chamber during because of engine stop, the torque that starts required bent axle rotation in next time is larger, and the starting acting is large, hard.

Be to solve the problems referred to above that lower positioned camshaft type engine exists, it is that the Chinese patent (being patent documentation 2) of CN101187319A have ever made trial that publication number was once arranged.In this patent documentation 2, mainly by at timing gear centrifugal-block being set, after motor stops fully, realize opening of inlet and outlet door.But such decompressor; only after stopping fully, motor make intake valve or exhaust valve open pressure release; can realize starting next time the purpose of the torque that reduces the bent axle rotation; and the impact force that engine components is produced for bent axle counter-rotating in the engine shutdown process can't reduce, thereby engine components still can not be avoided because of the impaired situation of reversing.And there is the problem of poor reliability in its practical application.

Therefore; the problem that the utility model faces is: in the situation that existing lower positioned camshaft type engine structural dimensions is not done to change; the release of chamber pressure when effectively realizing engine shutdown, thereby the torque of turning crankshaft when reducing the engine shutdown counter-rotating to the impact force of corresponding part generation and reducing engine start.

The model utility content

For realizing above-mentioned problem, the utility model provides a kind of decompressor of keeping the constant motor of existing lower positioned camshaft type engine structural dimensions, the torque of turning crankshaft in the time of can effectively reducing the impact force of counter-rotating generation and reduce engine start, and then it is originally lower to guarantee that it is embodied as.

First aspect of the present utility model provides a kind of decompressor of motor, comprising: camshaft, have intake and exhaust cam and timing gear on it, and it is located at rotatably on the crankcase body and forms underneath camshaft; Lower shake-changing arm, it is arranged on the cylinder block of camshaft top; By lower shake-changing arm, the switching of camshaft actuated inlet door, exhaust valve is characterized in that, this decompressor also comprises: one-way element, and it is located on this camshaft and transmitting torque when camshaft reverses only; Relief cam, its one are located on this one-way element, its when action make intake valve and exhaust valve at least one be in open mode to reduce the pressure of engine chamber; Hooking part is based on this one-way element periphery; Stop component is installed on the engine inner wall with the most contiguous side of relief cam, and when the camshaft forward, it engages with hooking part, and the action of relief cam is stopped.

Second aspect of the present utility model on the basis of first aspect, is characterized in that, stop component is installed on the cylinder body wall with the composition engine inner wall of the most contiguous side of relief cam.

The third aspect of the present utility model on the basis of second aspect, is characterized in that, stop component comprises fitting seat and upper set bearing pin thereof, around plate and the spring part of this bearing pin rotation; When the camshaft forward, spring part makes plate be fixed on predeterminated position and engages with hooking part; When camshaft reversed, plate can rotate in order to avoid both engage under hooking part promotes, and under the effect of spring part, the plate of rotation returns to original position subsequently.

Fourth aspect of the present utility model on the basis of the third aspect, is characterized in that stop component also comprises the axle sleeve that is set on the bearing pin, and spring part is installed on this axle sleeve.

The 5th aspect of the present utility model on the basis aspect the 3rd or four, is characterized in that fitting seat is shaped as cuboid, and accordingly, the cylinder body wall is provided with the assembly department that cooperates with this fitting seat.

The 6th aspect of the present utility model on the basis of first aspect, is characterized in that, stop component is installed on the crankcase body wall with the composition engine inner wall of the most contiguous side of relief cam.

Model utility according to first aspect, guaranteeing not change under the prerequisite of existing main structure (the inside and outside structure that specifically refers to crankcase body, the cylinder block) size of lower positioned camshaft type engine, one-way element (containing relief cam) is located on the camshaft, and stop component is arranged on the cylinder body wall with the most contiguous side of relief cam, realized the application of decompressor on lower positioned camshaft type engine that is comprised of camshaft, relief cam (containing one-way element) and stop component.Both reach thus the utility model decompression, reduced the purpose of impact force, the compactness that has kept again original engine structure, and then can avoid adapting to the possibility that aforementioned decompressor causes motor to maximize because changing the motor main structure, application cost is relatively low.

According to the model utility of second aspect, stop component is installed on the cylinder body wall, and this position is in the hooking part top, and close together is convenient to stop component and is engaged with the effective of hooking part; Simultaneously, cylinder block is separate with crankcase body and separates, and is relatively easy at the fitting operation of the enterprising whereabouts dynamic component of cylinder body wall, simple and reliable process.

According to the model utility of the third aspect, the structure of stop component is comparatively simple, handles more flexibly, can effectively realize engaging (during the camshaft forward) and dodging (during the camshaft counter-rotating) of plate and hooking part.

According to the model utility of fourth aspect, can enlarge axial (bearing pin) spacing area of plate, further guarantee plate around the steady rotation of bearing pin and then guarantee that it engages with the effective of hooking part, increase the reliability of engaging.

According to the model utility of the 5th aspect, fitting seat is designed to cuboid, and correspondingly the assembly department on the cylinder body wall just only needs one or two attachment face just can effectively realize both reliable installations, simplicity of design, and easy processing is easy to realize.

Model utility according to the 6th aspect, as another embodiment of the present utility model, stop component is except can be installed in the cylinder body wall upper outside, and it is installed on the crankcase body wall of the most close relief cam one side also is a kind of feasible mode, can realize the purpose of this utility model equally.

Description of drawings

Fig. 1 is the structural representation of the motor that relates to of the utility model.

Fig. 2 is the partial enlarged drawing of Fig. 1 convexity wheel shaft and associated components.

Fig. 3 is the right apparent direction schematic representation of one-way element among Fig. 2 (containing relief cam).

Fig. 4 is the schematic perspective view of intake and exhaust cam and one-way element (containing relief cam) among Fig. 2.

Fig. 5 is left apparent direction (indicating direction by Fig. 1) schematic representation of stop component among Fig. 2.

Fig. 6 is front apparent direction (indicating direction by Fig. 1) schematic representation of stop component among Fig. 2.

Fig. 7 be among Fig. 2 stop component look up direction (indicating direction by Fig. 1) schematic representation.

Fig. 8 be among Fig. 1 cylinder block look up the direction schematic representation.

Fig. 9 is that A-A illustrates the effect of relief cam under the camshaft forward state to sectional view among Fig. 2.

Figure 10 is that A-A illustrates the effect of relief cam under the camshaft inverted status to sectional view among Fig. 2.

Among the figure, 10 is motor, and 11 is crankcase body, 12 is cylinder block, and 24 is the cylinder body wall, and 27 is assembly department, 13 is cylinder head, and 14 is cylinder head cover, and 15 is bent axle, 16 is camshaft, and 61 is timing gear, and 62 is intake and exhaust cam, 63 is one-way element, and 64 is relief cam, and 65 is hooking part, 17 is lower shake-changing arm, and 18 is valve rocker, and 19 is stop component, 91 is assembly department, and 92 is bearing pin, and 93 is plate, 94 is spring part, 97 is lining, and g is the first attachment face, g ' assembly department the first attachment face, h is the second attachment face, and h ' is assembly department the second attachment face.

Embodiment

Below, describe implementing concrete mode of the present utility model with reference to accompanying drawing.The orientation that relates in the declarative procedure is as the criterion with the sign among Fig. 1.

Fig. 1 is the structural representation of the motor that relates to of the utility model, wherein, 'fornt', 'back', " left side ", " right side ", " on ", D score, be take this motor 10 be installed on the corresponding motor tricycle (not shown) state as the basis, by the orientation of viewed motor 10 under the driver normal operation.

Motor 10 is the main composition parts by crankcase body 11, the cylinder head 13 that is installed on the cylinder block 12 (can referring to Fig. 8) on these crankcase body 11 tops and is installed on these cylinder block 12 tops.The cylinder head cover 14 of coating gas cylinder head 13 is housed on the top of cylinder head 13.

Dispose the bent axle 15 that can rotate freely at crankcase body 11; Be provided with cylinder-bore 25 in cylinder block 12, piston 22 slides up and down to be located in this cylinder-bore 25; By connecting rod 23, piston 22 is connected with bent axle 15.Be provided with firing chamber 21 above piston 22, fuel mixture will burn in firing chamber 21, and piston 22 is moved vertically downward, by connecting rod 23, make bent axle 15 rotations.

Camshaft 16 is located at rotatably the left upper portion of crankcase body 11 and is formed underneath camshaft.Intake and exhaust cam (single cam) 62 is installed on this camshaft 16, is used for the switching of the inlet and outlet door (not shown) of motor 10; Timing gear 61 are installed on this camshaft 16 and in the left side of intake and exhaust cam 62; Timing gear 61 cooperate (indicating among the figure) with corresponding gear on the bent axle 15, make that these timing gear 61 and intake and exhaust cam 62 are corresponding to be rotated with bent axle 15.

Cylinder block 12 above camshaft 16 is provided with lower shake-changing arm 17, lower shake-changing arm 17 comprise respectively with intake and exhaust cam 62 after, the inlet and outlet lower shake-changing arm 71,72 (referring to Fig. 2, Fig. 9, Figure 10) that matches of front side.Inlet and outlet lower shake-changing arm 71,72 can be respectively around bottom rocker shaft 77 (referring to Fig. 2) rotary oscillation under the effect of intake and exhaust cam 62.

Being provided with above cylinder head 13 can be around the valve rocker 18 of valve lever pin (not shown) rotary oscillation, and similarly valve rocker 18 comprises inlet and outlet rocking arm (not illustrating separately among the figure).Inlet and outlet rocking arm one end links to each other with the inlet and outlet door, and the other end links to each other with inlet and outlet lower shake-changing arm 71,72 by inlet and outlet tappet 73,74 respectively.Like this, camshaft 16 rotations make intake and exhaust cam 62 corresponding rotations, the action drives lower shake-changing arm 17 of intake and exhaust cam 62, by inlet and outlet tappet 73,74 transmission, the action of lower shake-changing arm 17 acts on valve rocker 18, and finally drive into valve, exhaust valve opens and closes to finish motor 10 firing chambers, 21 normal inlet and outlet by timing gear 61 determined port timings.

When motor 10 starting, need apply external force and make bent axle 15 rotations, and intake valve be opened suck fuel mixture to the firing chamber 21, light by spark plug 29, thereby 10 beginnings of piloting engine are normally done work.After motor 10 startings, the burning of firing chamber 21 makes vertically to-and-fro motion of piston 22, makes bent axle 15 rotations by connecting rod 23.The rotation of bent axle 15, drive cam shaft 16 is finished the inlet and outlet of firing chamber 21 to keep normal combustion process as previously mentioned on the one hand; On the other hand, rotating force is delivered to output terminal (not marking among the figure) to realize the output of motor 10 power.

Fig. 2 is camshaft 16 and the partial enlarged drawing of parts on every side thereof, describes below in conjunction with Fig. 2 and other accompanying drawings detailed construction to decompressor of the present utility model.

As shown in Figure 2, cylinder block 12 seals by head gasket 26 with crankcase body 11 junction planes, and lower shake-changing arm 17 and camshaft 16 are set with going to upper and lower relation in the left side of both junction planes.Camshaft 16 is provided with intake and exhaust cam 62, this intake and exhaust cam 62 has intake and exhaust flange 68 (referring to Fig. 9～10), its rotating center is to be located at cam sleeve 49 on its left and right side, hollow (referring to Fig. 4), and intake and exhaust cam 62 is set on the camshaft 16 by this cam sleeve 49.Timing gear 61 are sleeved on the left cam axle sleeve 49 of intake and exhaust cam 62 and by timing gear pin (not shown) and are fixed on the camshaft 16, and intake and exhaust cam 62 carries out the pin joint (not shown) in the axial direction with timing gear 61 so that intake and exhaust cam 62 and timing gear 61 with camshaft 16 synchronous rotaries.

Referring to Fig. 3～4, Fig. 9～10, right cam axle sleeve 49 at intake and exhaust cam 62 is set with one-way element 63 (indirectly with rotating freely, one-way element 63 is located on the camshaft 16), relief cam 64 is located at the left side of this one-way element 63 and becomes with it as a whole, and this relief cam 64 is adjacent with intake and exhaust cam 62.

One-way element 63 has such characteristic: namely only when camshaft 16 counter-rotating (sense of rotation of camshaft 16 under motor 10 normal workings, following " forward " its reason is identical), with the transmission of torque of camshaft 16 to relief cam 64; And when camshaft 16 forward, thereby the torque that one-way element will not rotate camshafts 16 with camshaft 16 can not pass to relief cam 64.

Periphery 69 at one-way element 63 is equipped with hooking part 65; At the engine inner wall that cylinder body wall 24 and crankcase body wall 41 (referring to Fig. 1～2) consist of that comprises with relief cam 64 the most contiguous sides stop component 19 is installed, its with hooking part 65 engage to stop relief cam 64 when camshaft 16 forward with rotation therewith, thereby the action of relief cam 64 is stopped.

Relief cam 64 has the peaceful straight edge of decompression flange 66 section 67; Lower shake-changing arm 17 comprise can independent rotary oscillation inlet and outlet lower shake-changing arm 71,72, inlet and outlet lower shake-changing arm 71,72 has respectively the inlet and outlet top touching portion 75,76 that can have an effect with intake and exhaust cam 62 and relief cam 64.

Like this, when motor 10 normal operation (referring to Fig. 9), camshaft 16 is with bent axle 15 (referring to Fig. 1) forward, hooking part 65 engages with stop component 19 on the one-way element 63, one-way element 63 is not with camshaft 16 rotations (at this moment, camshaft 16 is by cam sleeve 49 rotation in the axis hole [not marking among the figure] of one-way element 63 of intake and exhaust cam 62 fixed thereon), the straight edge on the relief cam 64 is set to not contact with inlet and outlet top touching portion 75,76 67 this moments.Thereby when the intake and exhaust flange 68 of intake and exhaust cam 62 made the inlet and outlet door be in normal closed condition, relief cam 64 can not make it be in open mode.

When motor 10 is shut down (referring to Figure 10); impact because of firing chamber 21 interior residual pressures; can cause motor 10 counter-rotatings; camshaft 16 is with bent axle 15 corresponding counter-rotatings; and lock function will occur with the cam sleeve 49 of the intake and exhaust cam 62 that rotates synchronously with camshaft 16 in one-way element 63, cause one-way element 63 to rotate with camshaft 16 together with relief cam 64.At this moment, decompression flange 66 on the relief cam 64 be set to inlet and outlet top touching portion 75,76 at least one contact, and correspondingly, at least one in the inlet and outlet top touching portion 75,76 do not contact with the intake and exhaust flange 68 of intake and exhaust cam 62.Thereby, when the intake and exhaust flange 68 of intake and exhaust cam 62 should make the inlet and outlet door be in normal closed condition, the action of relief cam 64 make intake valve and exhaust valve at least one be in open mode to reduce the pressure of engine chamber 21.Because firing chamber 21 internal pressures reduce; its power that reacts on motor 10 associated components reduces; can greatly reduce thus the damaging impact power that counter-rotating produces motor 10 associated components in motor 10 stopping process, guarantee the normal service life of associated components.

Simultaneously; piloting engine 10 o'clock next time; as mentioned above; because the pressure of engine chamber is opened and reduced at least one that the action of relief cam 64 has made intake valve and exhaust valve when shutting down; therefore the torque of required turning crankshaft 15 in the time of can reducing to start; if adopt the mode of pin starting, more laborsaving when the driver will be started.After the pressure of initial combustion chamber 21 was discharged, camshaft 16 is forward under motor 10 normal workings, and relief cam 64 is forward thereupon, and the contravention 98 (referring to Fig. 5, Fig. 1) of dialling that hooking part 65 is run into plate 93 engages, and removes decompression state.

In above-mentioned embodiment of the present utility model, it is worth mentioning that, the decompressor that the utility model arranges at lower positioned camshaft type engine, it does not change the physical dimension of the main structure of motor such as crankcase body, cylinder block, thereby in the situation that keeps original engine structure compactness, avoid for arrange that this decompressor changes that the structural dimensions of motor causes that motor maximizes may, its application cost is relatively low.

In the utility model embodiment, one embodiment is that stop component 19 can be installed on the cylinder body wall 24 with the composition engine inner wall of relief cam 64 the most contiguous sides, and another embodiment is that this stop component 19 can be installed on the crankcase body wall 41 with the composition engine inner wall of relief cam 64 the most contiguous sides.No matter be installed in and also be mounted on the cylinder body wall 24 on the crankcase body wall 41, can both realize that one-way element 63 only transmits the effect of camshaft 16 torques when camshaft 16 counter-rotating, thereby reach the purpose of this utility model.In addition, contact as the time spent on the specific design of air inlet lower shake-changing arm 71 or exhaust lower shake-changing arm 72 at decompression flange 66, one embodiment is set to contact one of them reach the utility model and can open one of inlet and outlet door to reduce the purpose of firing chamber 21 pressure when shutting down; Another embodiment is set to contact simultaneously air inlet lower shake-changing arm 71 and exhaust lower shake-changing arm 72 reaches aforementioned purpose of the present utility model.In the explanation, embodiment will be installed on the cylinder body wall 24 with stop component 19 below of the present utility model, and decompression flange 66 acts on inlet and outlet lower shake-changing arm 71,72 simultaneously so that inlet and outlet Men Junke is in a kind of like this embodiment of open mode.

Shown in Fig. 5～7, stop component 19 comprises: a fitting seat 91 is provided with a bearing pin 92 on this fitting seat 91; A plate 93 that has rotating center hole (not shown) to rotate around bearing pin 92, two ends along from its center bore a to side respectively are provided with dials contravention 98 and positive stop end 99, dial contravention 98 and be used for engage (referring to Fig. 2～3) with hooking part 65 on the one-way element 63, make under the prevention of the positive stop lug boss 39 of positive stop end 99 on being based in fitting seat 91 and dial contravention 98 and be limited to the position that just engages with hooking part 65 when motor 10 works; A spring part 94, it is installed on this bearing pin 93, and an end of spring part 94 is stuck in group contravention 98 of plate 93, and the other end is fixed on the fitting seat 91, so that plate 93 is got back to the position of original restriction under the effect at elastic force when leaving the restriction position.Bearing pin 92 passes plate 93, spring part 94 rear rivetings fix on the fitting seat 91, and plate 93 axial positions are fixed.Be provided with a through hole 95 as mounting hole in vertical state and away from bearing pin 92 with bearing pin 92 on the fitting seat 91.

In conjunction with such as Fig. 1～2, by through hole 95, stop component 19 is installed in one-way element 63 with bolt 96 top is positioned on the left hand cylinder body wall 24 of cylinder block 12.When camshaft 16 forward, spring part 94 makes being fixed on predeterminated position and engaging with set hooking part 65 on the one-way element 63 of plate 93 at plate 93 positive stop ends 99 spacing lower.When camshaft 16 counter-rotating, group contravention 98 of plate 93 can issue in the reverse promotion of hooking part 65 living rotation and not engage with hooking part 65, and its positive stop end 99 leaves positive stop lug boss 39; And after hooking part 65 was crossed group contravention 98, under the effect of spring part 94, the plate 93 of rotation returned to the position of original restriction, and such action is corresponding with all numbers of camshaft 16 counter-rotatings to be carried out repeatedly.

As the improvement to above-mentioned stop component 19, be set with lining 97 at bearing pin 92, this lining 97 can limit moving axially of plate 93, and spring part 94 is installed on the lining 97.Like this, can prevent that plate 93 from axial-shift occuring to strengthen the reliability of engaging when engaging with hooking part 65.

Further, the fitting seat of stop component 19 is cuboid in the utility model, and it has first and second attachment face g, h.Accordingly, be provided with the assembly department 27 that stop component 19 is installed at cylinder body wall 24, which is provided with first and second attachment face of assembly department g ', h ', be provided with tapped hole 28 corresponding to through hole 95 at the assembly department first attachment face g ' of cylinder body wall 24, by g, h, four attachment faces of g ', h ' and through hole 95 tapped holes 28, stop component 19 is fixed on the cylinder body wall 24 effectively by bolt 96.

Certainly; stop component 19 also can have other forms in the utility model; also can there be simultaneously other to be fixed on mode on the cylinder body wall float chamber body wall, but as long as its scheme does not break away from purport of the present utility model, all should be within claim protection domain of the present utility model.

In addition, the decompressor of motor of the present utility model is not only applicable to the motor tricycle motor mentioned among the embodiment, is applicable to other lower positioned camshaft type engines yet.

Claims (6)

1. the decompressor of a motor comprises: camshaft, have intake and exhaust cam and timing gear on it, and it is located at rotatably on the crankcase body and forms underneath camshaft; Lower shake-changing arm, it is arranged on the cylinder block of described camshaft top; By lower shake-changing arm, the switching of described camshaft actuated inlet door, exhaust valve is characterized in that,

This decompressor also comprises: one-way element, and it is located on this camshaft and transmitting torque when camshaft reverses only; Relief cam, its one are located on this one-way element, its when action make intake valve and exhaust valve at least one be in open mode to reduce the pressure of engine chamber; Hooking part is based on this one-way element periphery; Stop component is installed on the engine inner wall with the most contiguous side of described relief cam, and when described camshaft forward, it engages with described hooking part, and the action of relief cam is stopped.

2. the decompressor of motor as claimed in claim 1 is characterized in that, described stop component is installed on the cylinder body wall with the composition engine inner wall of the most contiguous side of described relief cam.

3. the decompressor of motor as claimed in claim 2 is characterized in that, described stop component comprises fitting seat and upper set bearing pin thereof, around plate and the spring part of this bearing pin rotation; When described camshaft forward, spring part makes described plate be fixed on predeterminated position and engages with described hooking part; When described camshaft counter-rotating, plate can rotate in order to avoid both engage under hooking part promotes, and under the effect of spring part, the plate of rotation returns to original position subsequently.

4. the decompressor of motor as claimed in claim 3 is characterized in that, described stop component also comprises the axle sleeve that is set on the described bearing pin, and described spring part is installed on this axle sleeve.

5. such as the decompressor of claim 3 or 4 described motors, it is characterized in that described fitting seat is shaped as cuboid, accordingly, described cylinder body wall is provided with the assembly department that cooperates with this fitting seat.

6. the decompressor of motor as claimed in claim 1 is characterized in that, described stop component is installed on the crankcase body wall with the composition engine inner wall of the most contiguous side of described relief cam.

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