CN110397487A - Engine - Google Patents

Abstract

The present invention relates to a kind of engine, which includes: cylinder head；Cam shell is fastened in the cylinder head；Camshaft is rotatably supported by the cam shell and is supplied with lubricating oil；With the housing being fastened on the cam shell, wherein the cam shell includes the side wall extended along the camshaft, and the inner surface of the side wall includes the sunk area on gravity direction to lower recess.

Description

Engine

Technical field

The present invention relates to engines.

Background technique

A kind of engine known, wherein the oil for lubrication is fed into the sliding part of such as camshaft (for example, with reference to day Present patent application bulletin special open 2012-167647).

In some cases, engine includes cylinder head, the cam shell being fastened in cylinder head and covering cam shell Housing on the upside of body.These components are fastened via containment member, which inhibits from engine oil leakage.Here, due to combustion The temperature of the burning of material, cylinder head is relatively high.However, since cam shell is spaced apart with combustion chamber, the temperature of cam shell Lower than the temperature of cylinder head.This leads to the temperature difference between cylinder head and cam shell.Particularly, when engine in a short time from When low load condition is switched to higher load condition, which increases.The temperature difference may cause between cylinder head and cam shell Thermal dilation difference increases, this, which may cause, occurs oil leak between cylinder head and cam shell.

Summary of the invention

Therefore, the purpose of the present invention is to provide a kind of engines for inhibiting oil leak.

The object of the present invention is to provide a kind of engine, which includes: cylinder head；Cam shell is fastened on institute It states in cylinder head；Camshaft is rotatably supported by the cam shell and is supplied to lubricating oil；And housing, fastening On the cam shell, wherein the cam shell includes the side wall extended along the camshaft, and the side wall Inner surface includes the sunk area on gravity direction to lower recess.

It is supplied to the lubricating oil of camshaft to heat up due to the burning of engine, and is sprayed in response to the rotation of camshaft Splash the inner surface of the side wall of cam shell.Since the inner surface of side wall includes the depressed area on gravity direction to lower recess Domain, therefore oil is retained in sunk area.This promotes the heat transfer of oil to cam shell between oil and cam shell Heat exchange.This increases the temperature of cam shell, it is suppressed that the increase of the temperature difference between cam shell and cylinder head, and also Inhibit the increase of the thermal dilation difference between cam shell and cylinder head.Therefore can inhibit between cylinder head and cam shell Oil leak.

The cylinder head may include cooperating the first sealing surfaces that the first containment member is clipped in the middle with the side wall, The side wall may include the second sealing surfaces that the second containment member is clipped in the middle with housing cooperation, and described recessed Recessed region can be set compared to second sealing surfaces closer at the position of first sealing surfaces.

The inner surface of the side wall may include the top area that the upside of gravity direction is extended to from the sunk area Domain, and when being observed in the section in the direction extended perpendicular to the camshaft, the upper area can be relative to connection The line of the inward flange of the inward flange of first sealing surfaces and second sealing surfaces is located at the outside of the cam shell.

When observing in the section in the direction extended perpendicular to the camshaft, the inner surface of the side wall can be from The upper area is smoothly extended to the sunk area.

The sunk area can extend along the camshaft.

The side wall may include in the inboard portion of the cam shell rib outstanding.

The side wall may include: the air inlet side wall positioned at air inlet side；It is and described with the exhaust side wall for being located at exhaust side Rib can be set on the exhaust side wall.

Effect of the invention

According to the present invention it is possible to provide a kind of engine for inhibiting oil leak.

Detailed description of the invention

Fig. 1 is the explanatory diagram of engine.

Fig. 2A is the top view of cam shell, and Fig. 2 B is the top view of cylinder head；

Fig. 3 A is the front view of cylinder head and cam shell, and Fig. 3 B is the rearview of chain cover；

Fig. 4 A is the sectional view intercepted along the line A-A of Fig. 2A, and Fig. 4 B is the enlarged view of sunk area；

Fig. 5 is the sectional view along the line B-B in Fig. 2A；And

Fig. 6 A is according to the partial top view of the cam shell of a modification, and Fig. 6 B is cut along what the line C-C of Fig. 6 intercepted Face figure.

Specific embodiment

Fig. 1 is the explanatory diagram of engine 1.Fig. 1 shows orthogonal X, Y and Z-direction.In Fig. 1, Z-direction is parallel In gravity direction, Y-direction is parallel to what crankshaft 15, the camshaft 53 positioned at air inlet side and the camshaft 54 positioned at exhaust side extended Direction.Engine 1 includes cylinder block 10, cylinder head 20, cam shell 30 and housing 40.Cylinder head 20 is fastened on cylinder block 10 On upside.Cam shell 30 is fastened on the upside of cylinder head 20.Housing 40 is fastened on the upside of cam shell 30, and convex The upside of wheel shell 30 is covered by housing 40.

Multiple cylinders 12 are provided in cylinder block 10, the cylinder 12 is arranged along the depth direction of Fig. 1.Piston 11 can on Under be movably contained in each cylinder 12.When piston 11 moves up and down, crankshaft 15 rotates.Cylinder 12, piston 11 and cylinder Lid 20 limits combustion chamber CH, and the volume of combustion chamber CH is increased or reduced by the up and down motion of piston 11.It is lubricated for storing The oil sump 16 of oil is fastened on the lower part of cylinder block 10.Oil is supplied to hair by oil circuit of the oil pump in engine 1 Each sliding part in motivation 1, is then recycled to oil sump 16.

For cylinder head 20, the right side wall 23 and left side wall 24 that right side and left side are located in Fig. 1 are along as cylinder The Y-direction of 12 orientations extends.Air inlet 21 and exhaust outlet 22 are respectively in the outer surface of right side wall 23 and left side wall 24 Outer surface upper opening.Air inlet pipe 81 and exhaust pipe 82 are fastened on respectively on right side wall 23 and left side wall 24, with air inlet 21 It is connected to exhaust outlet 22.Therefore, air inlet pipe 81 and exhaust pipe 82 are connected by air inlet 21 and exhaust outlet 22 and combustion chamber CH respectively It is logical.In addition, the holding of cylinder head 20 is opened for the rotation respectively responsive to intake-side camshaft 53 and exhaust side camshaft 54 With the intake and exhaust valves for closing air inlet 21 and exhaust outlet 22.Camshaft 53 and 54 is by the rotatable twelve Earthly Branches of cam shell 30 It holds.

Fig. 2A is the top view of cam shell 30.Cam shell 30 includes right side wall 33, left side wall 34, rear wall 35 and more A abutment wall 37.Rear wall 35 continuously extends to right side wall 33 and left side wall 34 in the X direction, and is located at cam shell 30 End in the-y direction.Multiple abutment walls 37 are supported between right side wall 33 and left side wall 34 facing with each other, each Abutment wall extends in X direction.Camshaft 53 and 54 is rotatably supported into and is spaced at a predetermined interval in the X direction by abutment wall 37 It opens.Be formed in camshaft 53 and 54 intake and exhaust valves for respectively driving each cylinder admission cam 53c and Exhaust cam 54c.

Sprocket wheel 55 positioned at air inlet side and the sprocket wheel 56 positioned at exhaust side be connected respectively to camshaft 53 and 54 in the side+Y Upward end.For crankshaft 15 and sprocket wheel 55 and 56 interlockings/gearing timing chain 65 to be wrapped in sprocket wheel 55 and 56.Knot Fruit, when crankshaft 15 rotates, sprocket wheel 55 and 56 is also rotated via timing chain 65.For storing the chain cover 60 of timing chain 65 It is fastened on the end in +Y direction of cam shell 30 and cylinder head 20.In addition, simplifying the diagram of chain cover 60.

The lubricating oil being stored in oil sump 16 is fed into camshaft 53 and 54 via multiple paths.For example, oil via The oil circuit formed in camshaft 53 and 54 is fed between camshaft 53 and 54 and the bearing of journals.Bearing of journals setting is supporting In wall 37 and camshaft 53 and 54 is kept to rotate.In addition, oil is supplied to admission cam 53c and exhaust cam from cam spray thrower 54c。

Sealing surfaces 33s, 34s and 35s are respectively formed on the top of right side wall 33, left side wall 34 and rear wall 35. Sealing surfaces 33s, 34s and 35s are continuous each other and are basically parallel to X/Y plane.Fig. 2A show sealing surfaces 33s, 34s and Containment member CL3 on 35s.Containment member CL3 is the lining made of the rubber, particularly acrylic rubber with oil resistivity Pad, but not limited to this, and can be the liquid lining being described later on.On sealing surfaces 33s, 34s and 35s, it is formed with not Multiple bolts hole that useful appended drawing reference indicates, are inserted into it for the respective bolt for cam shell 30 to be fastened on housing 40 In.Containment member CL3 is located at the outside of multiple bolts hole.

Cam shell 30 and housing 40 are sandwiched in the close of sealing surfaces 33s, 34s and 35s and housing 40 in containment member CL3 It is secured to one another in the state of sealing between surface.Which suppress generate gap between cam shell 30 and housing 40.Sealing surfaces 33s, 34s and 35s are to cooperate with housing 40 by an example of containment member CL3 the second sealing surfaces being clipped in the middle.In addition, As described in detail later, it is respectively formed with and is arranged essentially parallel on right side wall 33 and left side wall 34 near chain cover 60 The sealing surfaces 37s and 38s of YZ plane.In addition, the inner surface of right side wall 33 and the inner surface of left side wall 34 respectively include Sunk area 330 and 340 explained in detail below.

Fig. 2 B is the top view of cylinder head 20.After cylinder head 20 further includes other than above-mentioned right side wall 23 and left side wall 24 Side wall 25.Rear wall 25 extends continuously to right side wall 23 and left side wall 24 in X direction, and positioned at cylinder head 20 in the side-Y Upward end.Cylinder head 20 is provided with holding in the part that it is surrounded by right side wall 23, left side wall 24 and rear wall 25 The retaining hole 210 of corresponding spark plug for respective cylinder, the guide hole 211 of the corresponding inlet valve of guidance and the corresponding exhaust valve of guidance Guide hole 212.Be respectively formed on the top of right side wall 23, left side wall 24 and rear wall 25 sealing surfaces 23s, 24s and 25s.Sealing surfaces 23s, 24s and 25s are continuous each other and are arranged essentially parallel to X/Y plane.

Fig. 2 B shows the containment member CL2 on sealing surfaces 23s, 24s and 25s.Containment member CL2 is by with oil resistivity Rubber be made, and be form seal pad (FIPG) in place.The FIPG of liquid is applied to before the fastening of cam shell 30 Then sealing surfaces 23s, 24s and 25s of cylinder head 20 are hardened by heating or absorbing the moisture in air, to become Elastomer.In this way, FIPG is liquid lining.In addition, containment member CL2 is without being limited thereto, and can be as described above by third It is padded made of olefin(e) acid rubber etc..On sealing surfaces 23s, 24s and 25s, it is formed with the multiple spiral shells being not represented by reference numeral Keyhole, it is formed therein for the bolt for cam shell 30 to be fastened in cylinder head 20.Containment member CL2 is located at multiple spiral shells The outside of keyhole.Cylinder head 20 and cam shell 30 are sandwiched in sealing surfaces 23s, 24s and 25s and cam in containment member CL2 It is secured to one another in the state of between the sealing surfaces in the-z direction of shell 30.Which suppress in cylinder head 20 and cam shell Gap is formed between 30.Sealing surfaces 23s, 24s and 25s are will sealing with the cooperation of right side wall 33, left side wall 34 and rear wall 35 The example for the first sealing surfaces that component CL2 is clipped in the middle.As will be described later, in 23 He of right side wall near chain cover 60 The sealing surfaces 27s and 28s for being arranged essentially parallel to YZ plane are respectively formed on left side wall 24.

Fig. 3 A is the front view of cylinder head 20 and cam shell 30.Fig. 3 A shows the lower wall 29 of cylinder head 20, Extend in X direction between right side wall 23 and left side wall 24.Lower wall 29 be located at +Y direction on sealing surfaces 29s with it is above-mentioned close It is continuous for sealing surface 27s and 28s.Sealing surfaces 27s, 28s and 29s are arranged essentially parallel to XZ plane.In cylinder head 20 and convex In the state that wheel shell 30 is secured to one another, the sealing surfaces 27s and 28s of cylinder head 20 and the sealing surfaces of cam shell 30 37s and 38s is continuous each other, and these sealing surfaces 27s, 28s, 29s, 37s and 38s is substantially flat in XZ plane Row.Fig. 3 A shows sealing surfaces 27s, 28s, 29s, the containment member CL5 on 37s and 38s.Containment member CL5 with it is above-mentioned close It is identical to seal component CL2, but not limited to this.

Fig. 3 B is the rearview of chain cover 60.Fig. 3 B shows a part of the chain cover 60 when observing in +Y direction. Chain cover 60 includes sealing surfaces 68s, and sealing surfaces 68s and sealing surfaces 27s, 28s, 29s, 37s and 38s cooperation will sealings Component CL5 is clipped in the middle.On sealing surfaces 27s, 28s, 29s, 37s and 38s and sealing surfaces 68s, it is formed with and does not assign Multiple bolts hole of appended drawing reference are inserted into it for the bolt for chain cover 60 to be fastened in cylinder head 20 and cam shell 30 In.Containment member CL5 is located at the outside of multiple bolts hole.Chain cover 60 containment member CL5 be sandwiched in sealing surfaces 27s, It is fastened in the state of between 28s, 29s, 37s and 38s and sealing surfaces 68s in cylinder head 20 and cam shell 30.This inhibits Between chain cover 60 and cylinder head 20 and cam shell 30 generate gap.

As described above, gap, cam shell 30 between cylinder head 20 and cam shell 30 and the gap between housing 40 And the gap between chain cover 60 and cylinder head 20 and cam shell 30 is sealing.Thus, for example, it is therefore prevented that it is supplied to convex The oil leak of wheel shaft 53 and 54 to outside.

Next, the right side wall 33 that cam shell 30 shown in Fig. 2A will be described.Fig. 4 A is intercepted along the line A-A of Fig. 2A Sectional view.The direction that the section extends perpendicular to camshaft 53 and 54.Right side wall 33 includes sunk area 330, bending region 331 and linear region 332.Bending region 331 is extended to the upside of gravity direction from sunk area 330.Linear region 332 is from curved Bent region 331 extends to the upside of gravity direction.Bending region 331 and linear region 332 are that weight is extended to from sunk area 330 One example of the upper area of the upside in power direction.Sunk area 330 and bending region 331 are all curved, and curvature Radius is substantially the same.The inner surface of right side wall 33 be it is curved, so as to from sunk area 330 to bending region 331 gradually Close to vertically.Linear region 332 is slightly slanted relative to gravity direction in cross section, but is substantially linearly extended.

Sunk area 330 is on gravity direction to lower recess.Fig. 4 B is the enlarged view of sunk area 330.Fig. 4 B is shown It is parallel to the horizontal line section HL of X-direction.Here, the lubricating oil for being supplied to camshaft 53 and 54 passes through the rotation of camshaft 53 and 54 Then it splashes.The oil that at least part is splashed is attached to the linear region 332 and bending region 331 of the inner surface of right side wall 33 On, it then flows downward along gravity direction, and be maintained in sunk area 330.Which ensure that oil is contacted with right side wall 33 Until the time that oil is overflowed from sunk area 330.The oil newly to splash is always held in sunk area 330.

Here, camshaft 53 and 54 is supplied to the oil from multiple paths, and while oil stream crosses these paths, oil It is heated up due to the burning in engine 1.Therefore, this high temperature oil being maintained in sunk area 330 transmits heat from oil To the right side wall 33 of cam shell 30, to promote the heat exchange between oil and cam shell 30.In addition, 330 shape of sunk area Extend as the X-direction extended along camshaft 53 and 54.Which ensure that the inner surface of oil and the right side wall 33 of cam shell 30 Between contact area, promote oil and cam shell 30 between heat exchange.In addition, Fig. 4 A shows the oil of splashing.

The heat exchange between high temperature oil and cam shell 30 is promoted in this way, thus in the temperature of cam shell 30 It rises.Which suppress the increases of the temperature difference between cylinder head 20 and cam shell 30, it is suppressed that the cylinder head due to caused by the temperature difference The increase of thermal dilation difference between 20 and cam shell 30.Here, if the heat between cylinder head 20 and cam shell 30 is swollen Swollen difference increases, then sealing surfaces 23s, 24s and 25s of cylinder head 20 may be relative to corresponding thereto close of cam shell 30 Seal surface location offset.As a result, the containment member CL2 being located between sealing surfaces that is situated between is likely to be broken, then oil may be in gas It is leaked between cylinder cap 20 and cam shell 30.In the present embodiment, the increase of thermal dilation difference is inhibited as described above, to press down This oil leak is made.

In addition, as shown in Figure 4 A, sunk area 330 is formed in compared to sealing surfaces 33s closer to the position of sealing surfaces 23s It sets at (than sealing surfaces 33s apart from sealing surfaces 23s closer proximity).Therefore, it may increase facing with each other and can The sealing surfaces 23s of cylinder head 20 and cam shell 30 around the sealing surfaces of cam shell 30 that oil leak gap can be become Temperature.This appropriately suppressed oil leak.

Incidentally, different in face of the sealing surfaces of sealing surfaces 23s of cylinder head 20 from cam shell 30, face each other Pair cam shell 30 sealing surfaces 33s and housing 40 sealing surfaces periphery far from cylinder head 20.Therefore, on the periphery In, the temperature difference and thermal dilation difference between cam shell 30 and housing 40 hardly increase, and hardly happen oil leak.Cause This, in the present embodiment, the sealing surfaces 23s's of the cylinder head 20 formed therein for being prone to oil leak of sunk area 330 In periphery.

Fig. 4 A shows the line segment CL between the inward flange for being connected to sealing surfaces 23s and the inward flange of sealing surfaces 33s. Bending region 331 and linear region 332 are located at the outside of cam shell 30 relative to line segment CL.In other words, it is bent region 331 The outside of cam shell 30 is projected into from line segment CL with linear region 332.Therefore, have in sectional view along line segment CL with side wall There is the case where rectilinear form to compare, it is ensured that the length of the inner surface of right side wall 33.Here, as described above, oily splash bending Region 331 and linear region 332, then flow to sunk area 330.As it ensure that the length of the inner surface of right side wall 33, because This ensures the time that oil is contacted with bending region 331 and linear region 332.Therefore, even if being also promoted using this configuration Heat exchange between oil and the right side wall 33 of cam shell 30.In addition, as sunk area 330, bending region 331 and linear Region 332 extends also along camshaft 53.

As shown in Figure 4 A, linear region 332 is smoothly extended to sunk area 330 through being bent region 331.Therefore, adhere to Oil on linear region 332 and bending region 331 flows to rapidly sunk area 330.Therefore, it is absorbed into a large amount of heat Before the linear region 332 and bending region 331 of right side wall 33, oil is maintained in sunk area 330, therefore the big calorimetric of oil Amount is transmitted to sunk area 330.This allows to improve the sealing surfaces 23s and cam shell 30 of cylinder head 20 facing with each other Sealing surfaces around cam shell 30 temperature.This appropriately suppressed oil leak.

In addition, as shown in Figure 4 A, the inclination angle of the linear region 332 above sunk area 330 is located on gravity direction It spends more precipitous than the tilt angle at the arbitrary point on sunk area 330.In other words, the tilt angle phase of linear region 332 For horizontal direction substantially at 90 degree.Therefore, the oil being attached on linear region 332 flows to rapidly sunk area 330.This is also fitted Locality inhibits oil leak.

Fig. 5 is the sectional view intercepted along the line B-B of Fig. 2A.Left side wall 34 is substantially right with right side wall 33 about YZ plane Claim.Therefore, as right side wall 33, the inner surface of left side wall 34 also includes sunk area 340, bending region 341 and linear Region 342.This facilitate the heat exchanges between oil and the left side wall 34 of cam shell 30, also inhibit the enclosed watch of cylinder head 20 Oil leak between the sealing surfaces of the left side wall 34 of face 24s and cam shell 30.

As described above, it is suppressed that thermally expanded due to caused by the temperature difference between them between cylinder head 20 and cam shell 30 The increase of difference, this is also inhibited between the sealing surfaces 37s and 38s of cam shell 30 and the sealing surfaces 68s of chain cover 60 Oil leak.In addition, the heat exchange between oil and cam shell 30 inhibits the excessive raising of oil temperature.Which suppress oil deterioration, And due to its viscosity it is excessive reduction and reduce its lubricity.

Furthermore it is ensured that the surface area of right side wall 33 and the respective inner surface of left side wall 34, it ensures that engine 1 The area on the surface that the blow-by gas of middle generation is contacted.Therefore, the inside table of blow-by gas and right side wall 33 and left side wall 34 Face contact, this facilitate the separation of oil and blow-by gas.Which suppress the increases of oil consumption, and since gas blowby is introduced air inlet System and generate white cigarette.

In the present embodiment, rear wall 35 is different from right side wall 33 and left side wall 34, but rear wall 35 can be similarly It constitutes.Using this configuration, heat exchange can be carried out between substantially entire cam shell 30 and oil, this is further suppressed The increase of the temperature difference between cam shell 30 and cylinder head 20.

In the present embodiment, sunk area 330 is formed in the substantially whole region of right side wall 33 extended in the Y direction On, but not limited to this.For example, above-mentioned sunk area 330 can be made only in the one of the region along Y-direction extension of right side wall 33 In part.For example, such sunk area 330 can be formed in compared to rear wall 35 closer at the position of chain cover 60.This The temperature for increasing the right side wall 33 of the cam shell 30 near chain cover 60, appropriately suppressed cam shell 30 and chain cover Oil leak between 60.This is equally applicable to the sunk area 340 of left side wall 34.

Next, by description according to the cam shell 30a of a modification.Fig. 6 A is the cam shell 30a according to the modification Partial top view.Fig. 6 B is the sectional view intercepted along the line C-C of Fig. 6 A.Inner surface of the cam shell 30a in left side wall 34a On be formed with rib 347.Rib 347 extends downwardly on gravity direction along the inner surface of left side wall 34a, and in cam shell The inside of 30a is prominent.Rib 347 is arranged between adjacent abutment wall 37.Setting rib 347 increases left side wall in this way The area of the inner surface of 34a.That is, it is ensured that can adhere to the amount of the oil on the inner surface of left side wall 34a.This promotees Into the heat transmitting from oil to left side wall 34a, it is suppressed that oil leak.

In addition, the volume that rib 347 increases left side wall 34a is arranged in left side wall 34a, which ensure that its rigidity.Ensure The vibration of the left side wall 34a due to caused by the burning in engine is inhibited positioned at the rigidity of the left side wall 34a of exhaust side.This suppression The vibrating noise of the housing 40 due to caused by the 40 vibration transmitting from left side wall 34a to housing is made.

The position of rib 347 is not limited to position shown in Fig. 6 A, but can be set far to fasten 20 He of cylinder head At the position of the bolt of cam shell 30a.Itself the reason is as follows that: the heat near bolt, between cylinder head 20 and cam shell 30a The increase of differences in expansion is adjusted by the fastening force of bolt to a certain extent, and this fastening force is in the position far from bolt It may be inadequate.Therefore, setting rib 347 ensures the cam shell at the position far from bolt at the position far from bolt The surface area of the left side wall 34a of 30a, which suppress far from bolt position between cylinder head 20 and cam shell 30a The increase of the difference of thermal expansion.

The rib similar to rib 347 also can be set in the right side wall 33 for being located at air inlet side.This further suppresses leakage Oil.Furthermore, it is possible to inhibit the vibration of right side wall 33.However, the setting of this rib may cause increase and the fuel of case weight The deterioration of consumption.Therefore, it is intended that considering the increase of case weight, the effect for inhibiting oil leak, reducing the effect of vibration etc. to set The position of rib, size and number.For example, being vibrated as caused by the burning of engine compared with the right side wall 33 for being located at air inlet side Tend to be transmitted to the left side wall 34a positioned at exhaust side.Therefore, in this variant, it is contemplated that in the weight for inhibiting cam shell 30a Reduce the vibration for being located at the left side wall 34a of exhaust side while amount increases, rib 347 is provided only in left side wall 34a.

Although some embodiments of the present invention are described in detail, the present invention is not limited to specific embodiments, but It can change or change in the range of claimed invention.

In above-described embodiment and modification, sunk area 330 is smoothly extended to bending region 331, but is not limited to this Kind shape.For example, sunk area can be in groove shape shape when observing in the section in the direction extended perpendicular to camshaft At on the substantially horizontal region of the inner surface in side wall.In addition, the inner surface of side wall can be it is curved so that inclination Angle moves closer to level on gravity direction from top to lower part, and sunk area can be by under the effect of gravity from shell The shape that projects upwards of inward flange in the bending region limit, to prevent oil stream to enclosure interior.In above-described embodiment and In modification, linear region 332 is formed as substantially straight, but not limited to this, and curved shape can be formed as.

Claims (7)

1. a kind of engine, comprising:

Cylinder head；

Cam shell, the cam shell are fastened in the cylinder head；

Camshaft, the camshaft are rotatably supported by the cam shell and are supplied with lubricating oil；With

Housing, the housing are fastened on the cam shell,

Wherein,

The cam shell includes the side wall extended along the camshaft, and

The inner surface of the side wall includes the sunk area on gravity direction to lower recess.

2. engine according to claim 1, wherein

The cylinder head includes the first sealing surfaces, and first sealing surfaces and the side wall, which cooperate, presss from both sides the first containment member In centre,

The side wall includes the second sealing surfaces, and second sealing surfaces cooperate with the housing is clipped in the second containment member Centre, and

The sunk area is arranged in compared to second sealing surfaces closer at the position of first sealing surfaces.

3. engine according to claim 2, wherein

The inner surface of the side wall includes the upper area that the upside of gravity direction is extended to from the sunk area, and

When observing in the section in the direction extended perpendicular to the camshaft, the upper area is relative to connecting described the The line of the inward flange of the inward flange of one sealing surfaces and second sealing surfaces is located at the outside of the cam shell.

4. engine according to claim 3, wherein

When observing in the section in the direction extended perpendicular to the camshaft, the inner surface of the side wall is from the top Segment smoothing it is extended to the sunk area.

5. engine according to any one of claim 1 to 4, wherein the sunk area prolongs along the camshaft It stretches.

6. engine according to any one of claim 1 to 5, wherein the side wall includes in the cam shell Inboard portion ground rib outstanding.

7. engine according to claim 6, wherein

The side wall includes:

Positioned at the air inlet side wall of air inlet side；With

Positioned at the exhaust side wall of exhaust side, and

The rib is arranged on the exhaust side wall.