CN204691928U - Motor - Google Patents

Abstract

The utility model provides a kind of motor.This motor uses timing chain that the rotating power of sprocket crank is passed to cam sprocket wheel, possesses the valve mechanism cover be arranged on by cam sprocket wheel and timing chain covering in cylinder head, in the inner face of valve mechanism cover, in the right region in opposite directions, position with the timing chain that reels to cam sprocket wheel, be provided with protuberance, gap between protuberance and timing chain is set the tooth depth being less than timing chain, protuberance is configured to, the length extended along the sense of rotation of timing chain is set to, and is more than or equal to the length of one piece of carrier bar of timing chain; The width extended along the width direction of timing chain is set to, and is more than or equal to the width of timing chain.Adopt this structure, can prevent timing chain from jumping tooth.

Description

Motor

Technical field

The utility model relates to motor, particularly has the motor of valve mechanism cover.

Background technique

Patent Document 1 discloses a kind of motor being made the timing chain generation tension force be wound on cam sprocket wheel by ratchet-type tensioner.

Above-mentioned ratchet-type tensioner has the plunger utilizing hydraulic pressure to exert a force, and this plunger pushes down above-mentioned timing chain by pushes on movable bar.In addition, this ratchet-type tensioner possesses ratchet mechanism, and this ratchet mechanism limits the retrogressing of the plunger caused because of the reaction force of above-mentioned timing chain.

But when use does not possess the hydraulic tensioner of above-mentioned ratchet mechanism, if the reaction force that timing chain produces is more than specified value, then the plunger of hydraulic tensioner can retreat.

After such hydraulic tensioner is assembled in motor, or when making engine start after being assembled again by timing chain when cautious motor, hydraulic pressure can't be supplied to hydraulic tensioner during owing to just starting, so, hydraulic tensioner cannot make timing chain produce tension force, to such an extent as to timing chain may occur lax and float up from the crown of cam sprocket wheel.In the case, the chain pin of timing chain likely crosses the crown of cam sprocket wheel, that is, slippage phenomenon occurs.

[patent documentation 1]: Japanese Unexamined Patent Publication 2012-202459 publication

Model utility content

For above-mentioned technical problem, the purpose of this utility model is, provides a kind of and possesses the motor that can prevent timing chain from jumping the valve mechanism cover of tooth.

As the technological scheme solved the problems of the technologies described above, the utility model provides a kind of motor.This motor uses timing chain that the rotating power of sprocket crank is passed to cam sprocket wheel, possess and be arranged in cylinder head and the valve mechanism cover that described cam sprocket wheel and described timing chain are covered, it is characterized in that: in the inner face of described valve mechanism cover, in the right region in opposite directions, position with the described timing chain that reels to described cam sprocket wheel, be provided with protuberance, gap between described protuberance and described timing chain is set the tooth depth being less than described timing chain, described protuberance is configured to, the length extended along the sense of rotation of described timing chain is set to, be more than or equal to the length of one piece of carrier bar of described timing chain, the width extended along the width direction of described timing chain is set to, and is more than or equal to the width of described timing chain.

Below, the advantage of the motor of the present utility model with said structure is described.

Usually, the hydraulic tensioner making timing chain produce tension force is possessed at motor, and this hydraulic tensioner possesses and utilizes hydraulic pressure to move forward timing chain of extruding, with the plunger making timing chain produce tension force, but when not possessing the component limiting the retrogressing of this plunger, after this motor just starts, owing to can not supply hydraulic pressure to hydraulic tensioner at once, hydraulic tensioner cannot make timing chain produce tension force, so timing chain likely can occur lax and float up from the crown of cam sprocket wheel.

To this, in motor of the present utility model, due to valve mechanism cover inner face with the position of timing chain that cam sprocket wheel is reeled in opposite directions and right region is provided with protuberance, so, even if timing chain occurs lax and floats up from the crown of cam sprocket wheel, the protuberance that the timing chain floated up also can be provided with the inner face of valve mechanism cover abuts against, so, the chain pin of timing chain can not skip the crown of cam sprocket wheel, can keep the engagement between timing chain and cam sprocket wheel.Thus, the slippage phenomenon that can prevent the chain pin of timing chain from skipping the crown of cam sprocket wheel occurs.

Accompanying drawing explanation

Fig. 1 is the sectional view of the valve mechanism cover of the motor of a kind of mode of execution of the present utility model.

Fig. 2 is the partial enlarged drawing of the valve mechanism cover shown in Fig. 1.

Fig. 3 is the plan view of the valve mechanism cover shown in Fig. 1.

Fig. 4 is the front view of the valve activator representing motor of the present utility model.

Embodiment

Below, with reference to accompanying drawing, mode of execution of the present utility model is described.

Fig. 1 ~ Fig. 4 illustrates a kind of mode of execution of the present utility model.In this embodiment, be that example is described with the vehicle-mounted DOHC of the vehicles such as automobile (Double Overhead Cam, double overhead camshaft) formula V-type engine.

As shown in Figure 4, the V-type engine of present embodiment possesses cylinder block 1.This cylinder block 1 is in the shape of the letter V, and on the top of left bank of cylinder 1A, right bank of cylinder 1B, is installed with cylinder head 2A, cylinder head 2B respectively.

On cylinder head 2A, cylinder head 2B, be configured with admission cam shaft and exhaust cam shaft (not shown).In addition, the bottom of cylinder block 1 is configured with bent axle (not shown).

The rotating power that each camshaft is subject to bent axle drives and rotates.That is, the rotating power of bent axle is passed to each camshaft by valve activator.

This valve activator as shown in Figure 4, possesses sprocket crank 10, left side intake cam sprocket wheel 11 and right side intake cam sprocket wheel 12 and timing chain 13 etc.

Sprocket crank 10 is installed in one end of not shown bent axle.Left side intake cam sprocket wheel 11, right side intake cam sprocket wheel 12 are installed in one end of respective admission cam shaft (not shown) of left bank of cylinder 1A, right bank of cylinder 1B respectively.Timing chain 13 is wound onto on sprocket crank 10, left side intake cam sprocket wheel 11 and right side intake cam sprocket wheel 12.

In addition, as shown in Figure 4, the admission cam shaft of cylinder head 2A side, exhaust cam shaft (not shown) are provided integrally with sprocket wheel 21, sprocket wheel 23 respectively; The admission cam shaft of cylinder head 2B side, exhaust cam shaft (not shown) are provided integrally with sprocket wheel 22, sprocket wheel 24 respectively.In addition, between the intake cam sprocket wheel 21 and exhaust cam sprocket wheel 23 of cylinder head 2A side, wrapped around chain 25; Between the intake cam sprocket wheel 22 and exhaust cam sprocket wheel 24 of cylinder head 2B side, wrapped around chain 26, thus form linkage structure.

Such valve activator by being arranged on cylinder block 1 and cylinder head 2A, the housing of face side of cylinder head 2B covers (not shown).In addition, the valve mechanism cover 3 (with reference to Fig. 1 ~ Fig. 3) that left side intake cam sprocket wheel 11, the top of right side intake cam sprocket wheel 12 and the top of timing chain 13 are installed on cylinder head 2A, cylinder head 2B covers.

In addition, in order to the winding angle of the winding angle and relative right side intake cam sprocket wheel 12 that increase timing chain 13 opposing left intake cam sprocket wheel 11, the part of timing chain 13 between left side intake cam sprocket wheel 11 and right side intake cam sprocket wheel 12 be directed takes turns 15 and pulls to sprocket crank 10 side, thus the part between left side intake cam sprocket wheel 11 with right side intake cam sprocket wheel 12 is become V-shaped by complications.Guide wheel 15 is supported in the valley between the left bank of cylinder 1A of cylinder block 1 and right bank of cylinder 1B rotatably.

So, timing chain 13 forms the V-arrangement region, upside of less V-shaped form the V-arrangement region, downside of larger V-shaped between left side intake cam sprocket wheel 11, right side intake cam sprocket wheel 12 and sprocket crank 10 while between left side intake cam sprocket wheel 11, right side intake cam sprocket wheel 12 and guide wheel 15.

At this, such as, if sprocket crank 10 rotates along the direction (clockwise direction) of arrow 100 indication in Fig. 4, then timing chain 13 also rotates along the direction (clockwise direction) of arrow 200 indication in Fig. 4.

Thus, the rotation initial position of timing chain 13 is set in sprocket crank 10, then, in the V-arrangement region, downside of timing chain 13, the straight section 13a between sprocket crank 10 and left side intake cam sprocket wheel 11 becomes the upstream side of sense of rotation; Straight section 13b between the right side intake cam sprocket wheel 12 on sprocket crank 10 and right side becomes the downstream side of sense of rotation.

In addition, in the V-arrangement region, upside of timing chain 13, the straight section 13c between left side intake cam sprocket wheel 11 and guide wheel 15 becomes the upstream side of sense of rotation; Straight section 13d between the right side intake cam sprocket wheel 12 on right side and guide wheel 15 becomes the downstream side of sense of rotation.

In the V-arrangement region, downside of timing chain 13, the straight section 13a of the upstream side in timing chain 13 is pushed down by movable guiding elements 16; The straight section 13b in the downstream side in timing chain 13 guiding elements 17 that is fixed is pushed down.The end that movable guiding elements 16 is positioned at sprocket crank 10 side is fixed in cylinder block 1 by rotatably mounted, and its end being positioned at intake cam sprocket wheel 11 side, left side is free state.That is, movable guiding elements 16 is supported to, and the end that can be positioned at sprocket crank 10 side with it is the state of a spot wobble.

Be positioned at the end (free end) of intake cam sprocket wheel 11 side, left side at movable guiding elements 16, be configured with hydraulic tensioner 18.

The tension force of this movable guiding elements 16 and hydraulic tensioner 18 pairs of timing chains 13 carries out the adjustment of appropriateness.Hydraulic tensioner 18 possesses plunger 18a, and this plunger 18a utilizes hydraulic pressure to move forward, and by timing chain 13 of extruding with movable guiding elements 16, regulates the tension force of timing chain 13.But, in the structure shown here, do not possess the component (ratchet mechanism etc.) that restriction plunger 18a retreats.

The straight section 13c (between left side intake cam sprocket wheel 11 and guide wheel 15) of the upstream side in the V-arrangement region, upside of timing chain 13 is pushed down by the 1st fixing guiding elements 19; The straight section 13d (between guide wheel 15 and right side intake cam sprocket wheel 12) in the downstream side in the V-arrangement region, upside of timing chain 13 is pushed down by the 2nd fixing guiding elements 20.

In order to prevent timing chain 13 from jumping tooth, anti-jump tooth measure can be taked to the valve mechanism cover 3 be arranged on respectively on cylinder head 2A, cylinder head 2B.In the present embodiment, only to take anti-jump tooth measure to be described to the valve mechanism cover 3 (being the valve mechanism cover 3 of left bank of cylinder 1A at this) of a side in left bank of cylinder 1A and right bank of cylinder 1B, but also can all take anti-jump tooth measure to the valve mechanism cover 3 of two sides.

As anti-jump tooth measure, in the inner face of valve mechanism cover 3, in the right region in opposite directions, position with the timing chain 13 that reels to intake cam sprocket wheel 11, be provided with protuberance 31.

Specifically, as shown in Figure 2, the gap A between protuberance 31 and timing chain 13 is set and is less than tooth depth B.This tooth depth B be timing chain 13 to skip intake cam sprocket wheel 11 crown and need minimum constructive height.Gap A is set and is less than tooth depth B, then timing chain 13 is difficult to the crown skipping intake cam sprocket wheel 11.

In addition, in protuberance 31, the length C that the sense of rotation along timing chain 13 extends is set to, and is more than or equal to the length of one piece of carrier bar 32 of timing chain 13.Further, as shown in Figure 3, in protuberance 31, the width D that the width direction along timing chain 13 extends is set to, and is more than or equal to the width E of timing chain 13.So, the base area of protuberance 31 is greater than and this bottom surface area of the end face of one piece of carrier bar 32 of right timing chain 13 in opposite directions, and therefore, this protuberance 31 can prevent the timing chain 13 in rotation from skipping the crown of intake cam sprocket wheel 11 conscientiously.

Generally, motor also cannot supply hydraulic pressure to hydraulic tensioner 18 after just starting, therefore, after motor just starts, because hydraulic tensioner 18 cannot be extruded timing chain 13, so timing chain 13 likely can relax and float up from the crown of intake cam sprocket wheel 11.

But, adopt the valve mechanism cover 3 with the present embodiment of said structure, even if timing chain 13 occurs lax and floats up from the crown of intake cam sprocket wheel 11 as described above, the plate 32 of the timing chain 13 floated up also can abut with protuberance 31, so, the pin 33 of timing chain 13 and the sleeve 34 embedding its periphery can not skip the crown of intake cam sprocket wheel 11, can keep the engagement between timing chain 13 and intake cam sprocket wheel 11.Like this, just can prevent the pin 33 of timing chain 13 and sleeve 34 from skipping the phenomenon of the crown of intake cam sprocket wheel 11, i.e. slippage phenomenon.

In the above-described embodiment, be illustrated to arrange the protuberance 31 preventing timing chain 13 from jumping tooth in the valve mechanism cover 3 of V-type engine, but the utility model is not limited to V-type engine.Such as, for the motor only possessing single valve mechanism cover as straight cylinder, be also suitable for structure of the present utility model.

Claims (1)

1. a motor, uses timing chain that the rotating power of sprocket crank is passed to cam sprocket wheel, possesses and is arranged in cylinder head and the valve mechanism cover described cam sprocket wheel and described timing chain covered, it is characterized in that:

In the inner face of described valve mechanism cover, in the right region in opposite directions, position with the described timing chain that reels to described cam sprocket wheel, be provided with protuberance,

Gap between described protuberance and described timing chain is set the tooth depth being less than described timing chain,

Described protuberance is configured to, and the length that the sense of rotation along described timing chain extends is set to, and is more than or equal to the length of one piece of carrier bar of described timing chain; The width extended along the width direction of described timing chain is set to, and is more than or equal to the width of described timing chain.