CN206845816U - Engine and its stretcher - Google Patents

Abstract

The utility model discloses a kind of engine and its stretcher, and top groove, bottom groove and ratchet segment are set on the inwall of sleeve, the first groove, the second groove and projection are set on push rod, adds jump ring.When jump ring is located in the first groove, push rod can be moved from top groove to bottom groove, and when jump ring is located in the second groove, ratchet is moved by limiting jump ring limitation push rod from top groove to bottom groove.Before installation, first the push rod of stretcher is pulled upwardly to topmost, then the push rod of stretcher and sleeve are firmly depressed into lowermost end, slowly lays down the power for being pressed in stretcher both ends, the push rod of stretcher does not eject in sleeve.After stretcher installation is fixed, firmly impact the sleeve of stretcher, push rod internally in the presence of spring force ejection to initialization position.When stretcher works, ratchet is moved by limiting jump ring limitation push rod from top groove to bottom groove when jump ring is located in the second groove, and the distance for avoiding push rod from declining is excessive, ensure that the normal use of chain.

Description

Engine and its stretcher

Technical field

Technical field of engines is the utility model is related to, specifically, is related to a kind of engine and its stretcher.

Background technology

Engine drives timing chain drive cam shaft to rotate by bent axle, the position of bent axle and camshaft be it is fixed, Timing chain needs certain surplus and could installed, and timing chain needs to be tensioned and could run during motion, and at this moment just needs are opened Tight device tensioning timing chain.

Hydraulic automatic tensioner device is used on some present engines, hydraulic automatic tensioner device has a drawback, when being exactly long Between shut down after, the machine oil inside stretcher leaks due to gap be present between push rod and sleeve, herein start engine when, due to Engine oil pressure will not be established at once, if the elastic force of stretcher contained spring can not overcome the opening during motion of timing chain slack list Power, timing chain are in loosening state, this period that moment of engine start establishes to oil pressure, the timing chain not being tensioned Can not normally it be engaged between bar and timing sprocket, engine has abnormal sound.Chain is it is also possible to there is slippage phenomenon.

Specifically, after machine oil enters at the top of stretcher, stretcher inside top has a steel ball promoted by spring, puts down When be in sealing state, when engine oil pressure is more than spring force, steel ball is pushed up out, machine oil enter stretcher inside, hydraulic oil Act on push rod, push rod promotes tensioning plate, and tensioning plate is displaced outwardly, and timing chain is close to, so as to reach the mesh of tension chain 's.After engine misses, engine oil pressure disappears, and causes stretcher inner chamber due to gap be present between stretcher push rod and sleeve Lubricating oil leakage, after long-time is shut down, there is no machine oil in stretcher, when restarting engine, if stretcher contained spring Elastic force can not overcome the tension force during motion of timing chain slack list, and the tension force of chain slack list can make push rod bounce back, if retraction is too many, Timing chain would be at loosening state.The timing chain not being tensioned and timing can not will be engaged normally, can send abnormal sound, It is also possible to there is slippage phenomenon.

Therefore it provides a kind of stretcher, is that those skilled in the art need to solve at present to ensure chain normal operation Technical problem.

Utility model content

In view of this, the utility model provides a kind of stretcher, to ensure chain normal operation.In addition, this practicality is new Type additionally provides a kind of engine with above-mentioned stretcher.

To achieve the above object, the utility model provides following technical scheme：

A kind of stretcher, including sleeve and the push rod that is moved in the sleeve, wherein,

The inwall of the sleeve has top groove and bottom groove, and the inwall of the sleeve is in the top groove and the bottom It is provided with the ratchet segment being all connected with the top groove and the bottom groove between groove, the ratchet of the ratchet segment is along the push rod Moving direction arrangement；

The push rod has the first groove and the second groove, and has between first groove and second groove convex Rise；

Stretcher also includes：The jump ring being arranged between the sleeve lining and the push rod, the jump ring is positioned at described The push rod can be moved to the bottom groove by the top groove when in the first groove；The jump ring is located in second groove When, the ratchet limits direction movement of the push rod from the top groove to the bottom groove by limiting the jump ring.

Preferably, in above-mentioned stretcher, the ratchet segment has multiple ratchets being sequentially connected, and the ratchet on top with The top groove is connected, and the ratchet of bottom is connected with the bottom groove.

Preferably, in above-mentioned stretcher, when the jump ring is located at the top groove, the projection to the top groove The distance of bottom land is more than the diameter of the jump ring.

Preferably, in above-mentioned stretcher, the jump ring is when the bottom groove, the raised groove for arriving the bottom groove The distance at bottom is more than the diameter of the jump ring.

Preferably, it is described convex when the jump ring is between the ratchet and second groove in above-mentioned stretcher The distance for playing the teeth groove of the ratchet is less than the diameter of the jump ring.

Preferably, in above-mentioned stretcher, the opening of the plug screw end in the outside of the sleeve has dismountable block up Head.

Preferably, in above-mentioned stretcher, first groove and second groove by segmental arc with it is described convex Connection is played, and the segmental arc protrudes to the direction away from the sleeve.

Preferably, in above-mentioned stretcher, the downside of the top groove is downward inclined plane, the bottom groove it is upper Side is acclivitous inclined plane.

A kind of engine, including stretcher, wherein, the stretcher is the stretcher described in any of the above-described.

Understood via above-mentioned technical scheme, the utility model discloses a kind of stretcher, by the inwall of sleeve Top groove, bottom groove and ratchet segment are set, and it is corresponding first groove, the second groove and projection are set on push rod, increase in addition Add jump ring, when jump ring is located in the first groove, push rod can be moved from top groove to bottom groove, and when jump ring is located at second When in groove, ratchet is moved by limiting jump ring limitation push rod from top groove to bottom groove.Before installing stretcher, first by stretcher Push rod be pulled upwardly to topmost, then the push rod of stretcher and sleeve be firmly depressed into lowermost end, then slowly lay down and be pressed in The power at tight device both ends, the push rod of stretcher do not eject in sleeve.After stretcher installation is fixed, firmly impact and be tensioned The sleeve of device, push rod internally in the presence of spring force ejection to initialization position.When stretcher works, jump ring is located at second Ratchet is moved by limiting jump ring limitation push rod from top groove to bottom groove when in groove, that is, avoids the distance that push rod declines very Greatly, can not normally be engaged between the timing chain and timing sprocket that are not tensioned, even chain jump tooth the problem of, ensure that chain Normal use.

Brief description of the drawings

, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only It is embodiment of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, also Other accompanying drawings can be obtained according to the accompanying drawing of offer.

Fig. 1 is that the engine that the utility model embodiment provides is provided with the structural representation after stretcher；

Fig. 2 is the structural representation of the overhanging most long status of push rod for the stretcher that the utility model embodiment provides；

Fig. 3 is the partial schematic diagram of the overhanging most long status of push rod for the stretcher that the utility model embodiment provides；

Fig. 4 is the partial schematic diagram during the push rod for the stretcher that the utility model embodiment provides moves down；

Fig. 5 is that jump ring enters the first groove during the push rod for the stretcher that the utility model embodiment provides moves down Partial schematic diagram；

Fig. 6 is partially schematic when the push rod for the stretcher that the utility model embodiment provides is moved down into bottom Figure；

Fig. 7 is that jump ring enters the second groove during the push rod for the stretcher that the utility model embodiment provides moves up Partial schematic diagram；

Fig. 8 is the partial structural diagram of the stretcher of the utility model embodiment offer when mounted；

Fig. 9 is the partial structural diagram of the stretcher of the utility model embodiment offer at work；

Figure 10 is working state structure schematic diagram of the stretcher of the utility model embodiment offer when there is oil pressure；

Figure 11 is that working state structure of the stretcher of the utility model embodiment offer when just starting no oil pressure shows It is intended to；

Figure 12 is that the structure when push rod for the stretcher that the utility model embodiment provides is moved downward to extreme lower position is shown It is intended to.

Embodiment

Core of the present utility model is to provide a kind of stretcher, to ensure chain normal operation.It is in addition, of the present utility model Another core is to provide a kind of engine with above-mentioned stretcher.

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belong to the scope of the utility model protection.

As shown in Fig. 1-Figure 12, the utility model discloses a kind of stretcher, including sleeve 3 and push rod 2, wherein, sleeve 3 Inwall be provided with top groove 31 and bottom groove 32, be provided with ratchet segment between top groove 31 and bottom groove 32, ratchet segment with Top groove 31 and bottom groove 32 are all connected with, the moving direction arrangement of the ratchet of ratchet segment along push rod；Push rod 2 has the first groove 21 And second groove 22 and the projection between the first groove 21 and the second groove 22；In addition, the stretcher also includes setting Jump ring 4 between the inwall of sleeve 3 and push rod 2, push rod 2 can be moved by top groove 31 when the jump ring 4 is located in the first groove 21 To bottom groove 32, when jump ring 4 is located in the second groove 22, ratchet limits push rod 2 from top groove 31 bottom of to by limiting jump ring 4 The direction movement of end slot 32.

By setting top groove 31, bottom groove 32 and ratchet segment on the inwall of sleeve 3 in the application, and corresponding pushing up First groove 21, the second groove 22 and projection are set on bar 2, add jump ring 4 in addition, design focuses on, when jump ring position 4 When in the first groove 21, push rod 2 can be moved from top groove 31 to bottom groove 32, and when jump ring 4 is located in the second groove 22 When, ratchet is moved by limiting the limitation push rod 2 of jump ring 4 from top groove 31 to bottom groove 32.When jump ring 4 is located in the second groove 22 When ratchet by limit jump ring 4 limit push rod 2 moved from top groove 31 to bottom groove 32, that is, avoid push rod 2 decline distance very Greatly, can not normally be engaged between the timing chain and timing sprocket that are not tensioned, even chain jump tooth the problem of, ensure that chain Normal use.

The end set of plug screw 5 in the outside of the application middle sleeve 3 has screwed hole, the dismountable plug of installation in this screwed hole 6.By the screwed hole of the end of plug screw 5, the sleeve of convenient use tool impact stretcher ejects push rod.Specifically, installation Before tight device, the push rod 2 of stretcher is first pulled upwardly to position i.e. shown in Fig. 3, then firmly by the push rod and set of stretcher topmost Cylinder is depressed into lowermost end (being compressed to position shown in Fig. 6 from position shown in Fig. 3), then slowly lays down and is pressed in stretcher both ends Power, the push rod and sleeve of stretcher, no longer extends at position as shown in Figure 7, now loads stretcher and plug screw 5, in plug screw 5 In the screwed hole of upper dress plug 6, exert oneself to impact the sleeve of stretcher using instrument, the effect of the internally spring force of push rod 2 Lower ejection, finally loads onto plug 6.

In preferred embodiment, the first groove 21 and the second groove 22 are connected by segmental arc with projection, and arc The direction protrusion of inwalls of the Duan Junxiang away from the sleeve 3 nearest apart from the segmental arc.

In addition, for the ease of making jump ring 4 from the interior disengaging of top groove 31 or entering top groove 31, by top groove in the application 31 downside is arranged to downward inclined plane, specifically, downside is close to the side of ratchet, tilts down as to ratchet Direction tilts.By above-mentioned setting can ensure jump ring 4 when being moved down out of top groove 31 can by the guiding of downside and Conveniently skid off.And during jump ring 4 is moved up by bottom, because the guiding of downside can facilitate jump ring 4 smoothly to enter top End slot 31.Similarly, the upper side of bottom groove 32 is arranged to acclivitous inclined plane, in order to which jump ring 4 smoothly passes in and out bottom Groove 32.

Stretcher layout drawing disclosed in the present application includes：Sleeve 3, the moveable push rod 2 in sleeve 3, push rod 2 it is another The timing chain that end is tensioned by tensioning plate 1, is provided with jump ring 4 between push rod 2 and sleeve 3.

The realization of the self-locking of the application is by designing the internal diameter of different sleeves 3 contacted with jump ring 4 and the external diameter of push rod 2 come real Existing, the inherent characteristic of the jump ring 4 in the application is fitted in all the time when being compressed by circumferencial direction on the inwall of sleeve 3.

In order to realize that push rod 2 is compressed to the most inner side of sleeve 3, that is, it is compressed to the bottom of Fig. 2 middle sleeves 3, it is necessary to make top The most long state of sleeve 3 is stretched in outside bar 2, position as shown in Figure 2, now the length of spring is most long, and elastic force is minimum.

Specifically, as shown in figure 3, jump ring 4 is located in the top groove 31 of sleeve 3 and positioned at the second groove 22 of push rod 2 Interior, the distance of projection now to the bottom land of top groove 31 is more than the diameter of jump ring 4, i.e., jump ring 4 can be by protruding out into the In one groove 21.

As shown in figure 4, push rod 2 is under external force, Fig. 4 states are reached by Fig. 3 states, now, jump ring 4 is located at top groove In 31 and in the first groove 21, i.e., during push rod 2 moves, jump ring 4 not by the active force of push rod 2, because This, the position of jump ring 4 does not become.

As shown in figure 5, push rod 2 is under external force, Fig. 5 states are reached by Fig. 4 states, now, jump ring 4 squeezes ratchet Pressure enters inside the first groove 21, and under the motion of push rod 2, jump ring 4 is synchronized with the movement to the bottom groove 32 of sleeve 3 with push rod 2.

As shown in fig. 6, jump ring 4 is located at bottom groove 32 and in the first groove 21, now, push rod 2 is stretched into sleeve 3 At most.

Shown in Fig. 7, now slowly stop applying downward power to push rod 2, in the presence of spring-return power, push rod 2 to Upper movement, because jump ring 4 is located in bottom groove 32, and the internal diameter of bottom groove 32 is larger, and jump ring 4 can lead to when push rod 2 moves up The projection of push rod 2 is crossed, i.e., the distance of the raised bottom land of end slot 32 on earth is more than the diameter of jump ring 4, process is moved up in push rod 2 Middle jump ring 4 is located at bottom groove 32 and in the second groove 22.Because the top incline of top groove 31 causes top groove 31 to block Firmly jump ring 4, and jump ring 4 blocks the lower surface of the second groove 22 of push rod 2 so that push rod 2 no longer moves up.

Then stretcher is installed after completing said process, i.e., is arranged on stretcher in the mounting hole of stretcher, and Plug screw 5 is installed, now the push rod 2 of stretcher does not eject.After stretcher and plug screw 5 is installed, it need to be filled on plug screw 5 stifled In first 6 screwed hole, the sleeve 3 of stretcher is firmly impacted, push rod 2 is internally ejected in the presence of spring force, is finally filled Upper plug head 6.Push rod 2 and sleeve 3 installed in stretcher is in Fig. 7 position balances, when sleeve 3 is by a upward impact When, the push rod 2 and the Fast Compression of sleeve 3 of stretcher are to Fig. 6 positions, and internally in the presence of spring force, the top of stretcher When bar 2 and sleeve 3 are quickly returning to Fig. 7 positions, due to now relatively large speed be present between the push rod 2 and sleeve 3 of stretcher, The push rod 2 and sleeve 3 of stretcher do not reach balance in Fig. 7 positions, the push rod 2 and sleeve 3 of stretcher internally spring force Under effect, the push rod 2 of stretcher ejects in sleeve 3, and by Fig. 8 positions, reaching Fig. 9, (what is drawn in figure is that jump ring 4 rests on At one of ratchet, actually jump ring 4 can be rested at one ratchet of any of which, and which spine jump ring 4 rests on The determination according to the tensioning of chain at tooth) operating position.

When the push rod 2 of stretcher is ejected into up to operating position (Figure 10 positions), jump ring 4 is located at one of the inwall of sleeve 3 In ratchet, push rod 2 by the pressure of tensioning plate 1 when being moved downwardly to position shown in Figure 11, because of the position-limiting action of ratchet so that card Spring 4 is stuck at the ratchet, it is impossible to moves down, and the projection of push rod 2 is less than the diameter of jump ring 4 to the distance of the teeth groove of ratchet, I.e. jump ring 4 can not pass through projection so that the projection of push rod 2 is blocked and can not moved downward by the spacing jump ring 4 of ratchet, stretcher The scope that moves down of push rod 2 be limited.

If timing chain can wear elongation, it is necessary to which tensioning plate 1 is further towards timing chain after engine long-play During bar ability tension chain, continued up under the elastic force effect of spring internally of push rod 2, when push rod 2 reaches position shown in Fig. 9 Continuation is put when up moving, push rod 2 can drive jump ring 4 to move up, when displacement can allow jump ring 4 to enter another ratchet When, then stretcher works in this ratchet position.In practice, when being fastened on which ratchet for jump ring 4 and being tensioned by timing chain What the elastic force collective effect of position and stretcher contained spring determined.When tensioning plate 1 gives top to the power and spring of push rod 2 During the Spring balanced of bar 2, the ratchet of the position correspondence where jump ring 4 is then corresponding spacing ratchet.

Engine as shown in Figure 10 has working condition during oil pressure, now, the pressure of oil pressure, the elastic force of spring and tensioning The tensile force that plate 1 is subject to is acted on push rod 2 so that push rod 2 is in poised state, and jump ring 4 is then in corresponding ratchet.

As shown in figure 11, working condition when engine has just started no oil pressure, i.e., by Figure 10 states engine again During startup, oil pressure is not established, and the chain of loosening tenses suddenly, and chain can be applied to the downward power of tensioning plate 1, in tensioning plate 1 In the presence of push rod 2 move downwardly to the raised state blocked with jump ring 4, push rod 2 will not continue to move downward, tensioning plate 1 It will not continue to move, avoid chain-loose.

In addition, disclosed herein as well is a kind of engine, including stretcher, the stretcher is disclosed in above-described embodiment Stretcher, therefore, the engine with the stretcher is also with above-mentioned all technique effects, and this is no longer going to repeat them.

Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other The difference of embodiment, between each embodiment identical similar portion mutually referring to.

The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or new using this practicality Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein The General Principle of justice can be realized in other embodiments in the case where not departing from spirit or scope of the present utility model.Cause This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein The most wide scope consistent with features of novelty.

Claims (9)

1. a kind of stretcher, including sleeve (3) and the push rod (2) that is moved in the sleeve (3), it is characterised in that

The inwall of the sleeve (3) has top groove (31) and bottom groove (32), and the inwall of the sleeve (3) is in the top groove (31) ratchet segment being all connected with the top groove (31) and the bottom groove (32) is provided between the bottom groove (32), Moving direction arrangement of the ratchet of the ratchet segment along the push rod (2)；

The push rod (2) has the first groove (21) and the second groove (22), and first groove (21) and described second recessed There is projection between groove (22)；

Stretcher also includes：The jump ring (4) being arranged between the sleeve (3) inwall and the push rod (2), the jump ring (4) Positioned at first groove (21) it is interior when the push rod (2) the bottom groove (32) can be moved to by the top groove (31)；Institute State jump ring (4) be located at second groove (22) it is interior when, the ratchet limits the push rod (2) by limiting the jump ring (4) Moved from the top groove (31) to the direction of the bottom groove (32).

2. stretcher according to claim 1, it is characterised in that the ratchet segment has multiple ratchets being sequentially connected, And the ratchet on top is connected with the top groove (31), the ratchet of bottom is connected with the bottom groove (32).

3. stretcher according to claim 1, it is characterised in that when the jump ring (4) is located at the top groove (31), institute The distance for stating the raised bottom land to the top groove (31) is more than the diameter of the jump ring (4).

4. stretcher according to claim 1, it is characterised in that when the jump ring (4) is located at bottom groove (32), institute The distance for stating the raised bottom land to the bottom groove (32) is more than the diameter of the jump ring (4).

5. stretcher according to claim 1, it is characterised in that the jump ring (4) is located at the ratchet and described second When between groove (22), the distance of the raised teeth groove to the ratchet is less than the diameter of the jump ring (4).

6. according to the stretcher described in claim any one of 1-5, it is characterised in that the plug screw end in the outside of the sleeve (3) The opening in portion has dismountable plug (6).

7. according to the stretcher described in claim any one of 1-5, it is characterised in that first groove (21) and described second Groove (22) is connected by segmental arc with the projection, and the segmental arc protrudes to the direction away from the sleeve (3).

8. stretcher according to claim 7, it is characterised in that the downside of the top groove (31) is downward inclination Face, the upper side of the bottom groove (32) is acclivitous inclined plane.

9. a kind of engine, including stretcher, it is characterised in that the stretcher is as described in claim any one of 1-8 Stretcher.