KR20170102318A - Timing Finger Followers Stopped Axially by the Pivot and by the Cylinder Head - Google Patents

Abstract

The vehicle structure includes a cylinder head 10 of a combustion engine, a camshaft 11 that rotates with respect to the cylinder head 10, at least one cylinder block 10 fixed to the cylinder head 10 and offset from the rotational axis of the camshaft 11. [ Pivot 15 and at least one timing finger follower 14 intended to actuate the intake and exhaust valves 13 of the combustion engine, the follower being mounted to the pivot 15, 11 by means of the rotation cam 111 in the form of a vibrating shake around the pivot 15. The axial stop of the timing finger follower 14 along the pivot 15 is constituted on the one hand by the axial passivating wall 101 defined by the cylinder head 10 and on the other hand by the pivot 15 .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a timing finger follower which is stopped axially by a pivot and a cylinder head,

The present invention relates to a vehicle structure, which includes a cylinder head of an internal combustion engine, a camshaft rotating with respect to the cylinder head, and at least one pivot point which is fixed to the cylinder head and is offset relative to the rotation axis of the camshaft.

The invention also relates to a vehicle comprising at least one said structure.

Referring to FIG. 1, it is known that, in a vehicle structure, the camshaft 3 transmits a linear movement to the valves 1 through the rocker arm 4. As shown in FIG. Each valve 1 is stressed by the spring 2 against and against the mechanical stresses of the corresponding rocker arm 4. The rocker arm 4 is pivoted about the pivot point 5 for pivotal guidance of the rocker arm 4. They are prevented from translational movement in the axial direction by the support spring 8 and the timing plate 7. [ The pivot point (5) is fixed to the cylinder head through the fixing screw (6).

Such configurations are satisfactory in function, but are relatively complex in design and installation and are difficult and costly to integrate into the current trend of space reduction in the development of internal combustion engines and the structure of engine compartments.

It is an object of the present invention to propose a construction of a vehicle that heals the disadvantages listed above.

In particular, it is an object of the present invention to provide a structure in which design and implementation are simple, economical, reliable, and easy integration in a situation where the space on the cylinder head is reduced.

This object can be achieved through a vehicle construction comprising a cylinder head of an internal combustion engine, a camshaft rotating relative to the cylinder head, a cylinder head fixed to the cylinder head and offset relative to a rotational axis of the camshaft At least one timing finger for controlling the inlet and exhaust valves of the internal combustion engine and being mounted on the pivot point and operating in a vibrational shaking motion about the pivot point by a rotation cam of the camshaft, An automotive construction comprising a timing finger follower, wherein axial stop portions of the timing finger follower along the pivot point are defined by an axial blocking wall defined by the cylinder head on one side and pivot point on the other side .

On the side opposite to the axial blocking wall for the timing finger follower, the pivot point may define a shoulder defining an axial blocking surface, the blocking surface and the blocking wall being for the timing finger follower Thereby forming axial stop portions in opposite directions.

Each pivot point may serve to mount two timing finger followers angularly separated from each other about the pivot point.

Each pivot point may include two pivot shafts aligned with each other, and each pivot shaft may serve to mount a corresponding timing finger follower by a sliding pivot connection.

The axial clearance may be between the pivotal point of the oscillating arm on one side and the timing finger follower on the other side and between the axial blocking wall and the timing finger follower and is between 0.05 mm and 0.2 mm.

The pivot point is preferably formed independently of the cylinder head, in particular from a monobloc or a single piece of integral type, and is fixed to the support surface defined by the cylinder head.

The elements that fix the pivot point on the cylinder head primarily include at least one centering stud and at least one secondary fixed screw so that the mechanical joint between each centering stud and the cylinder head wherein the centering stud and each of the securing screws pass through a passage opening disposed through a pivot point of the oscillating arm.

The pivot point may be parallel to the camshaft.

On the side opposite the area for connection to the pivot point, each timing finger follower may include an area that mechanically contacts the cam and mechanically stresses the stem of the valve, And is operated as a translational motion by the oscillating motion of the follower portion.

On the stem of the valve, the vehicle construction includes an adjustment lug interposed between the valve and the timing finger follower.

The vehicle may include at least one such construct.

Other advantages and features will become more apparent from the following description of particular embodiments thereof, given by way of non-limiting example, with reference to the accompanying drawings, in which:
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of an exemplary configuration already known from the prior art.
Figure 2 is a cross-sectional view along section AA of an exemplary construct according to the present invention.
Figure 3 is a cross-sectional view along section BB shown in Figure 2 of the exemplary construct shown in Figure 2;
4 is a cross-sectional view along section CC shown in Fig. 2 of the exemplary construct shown in Figs. 2 and 3. Fig.
5 is a cross-sectional view along section DD shown in Fig. 3 of the exemplary structure shown in Figs. 2-4.
6 is a perspective view of an example of a pivot point used in the constructions of FIGS. 2-5.

The present invention will be described with reference to Figs. 2 to 6, which mainly relates to a vehicle device, which includes a cylinder head 10 of an internal combustion engine, a camshaft 11 which rotates with respect to the cylinder head 10, And at least one pivot point (15) fixed to the camshaft (10) and offset relative to the axis of rotation of the camshaft (11). A cylinder head lid 12 may be selectively fixed to the cylinder head 10 and a cylinder head lid is disposed on the upper surface of the remaining monobloc part of the cylinder head 10. [ The camshaft 11 is arranged in the lower portion by the cylinder head block and in the upper portion by the cylinder head cover 12 in the manner of two shells which essentially do not move the bearings or roller bearings, (10). ≪ / RTI >

The invention also relates to a vehicle comprising at least one such device.

According to an important feature, the apparatus comprises at least one timing finger follower 14, which is intended to control the intake and exhaust valves 13 of the internal combustion engine, And is operated by an oscillatory rocking motion around the pivot point 15 by the rotation cam 111 of the camshaft 11. [ The axial stop of the timing finger follower 14 along the pivot point 15 is constituted by an axial blocking wall 101 which in particular at the level of the appropriate element on the pivot point 15, By the cylinder head 10 on one side and by the pivot point 15 on the other side.

Throughout this specification, the term "timing finger follower" is replaced by a "vibrating arm" at any point, so long as an oscillating arm is configured to perform the above- .

On the side facing the axial blocking wall 101 with respect to the timing finger follower 14, the pivot point 15 forms a shoulder which defines the axial blocking surface 157 in particular. The axial blocking surface 157 and the blocking wall 101 form axial stop portions in opposite directions to the timing finger follower portion 14 and the timing finger follower portions are disposed therebetween, And is held in the axial direction.

Each pivot point 15 is preferably angularly separated from each other about the pivot point 15 to serve to mount the two timing finger followers 14. [ For this purpose, each pivot point 15 comprises in particular two pivot shafts 151, which are aligned with one another in the axial direction and which respectively correspond to the timing finger follower 14 by a sliding pivot connection And the like.

Each pivot shaft 151 defines an axial surface 155 at its distal end, which is intended to face a corresponding axial blocking wall 101. The mounting clearance may be interposed between the axial surface 155 and the axial blocking wall 101, and is typically between 0.2 mm and 1 mm. The pivot point 15 is therefore located between the two axial blocking walls 101 which are defined by the cylinder head 10 and which define two axial faces 155 of the pivot point 15 Are separated from each other by a distance greater than the distance separating them from each other.

Preferably, the axial clearance is provided between the axial blocking surface 157 of the pivot point 15 and the timing finger follower 14 on one side and between the axial blocking wall 101 and the timing finger follower portion 14 on the other side, And is usually between 0.05 mm and 0.2 mm. The alignment between the pivot point 15 and the timing finger follower 14 is preferably an axial sliding type, such as the standard fit of the H7g6 type.

More precisely, it is possible to provide a first gap between the surface 157 of the pivot point 15 and the timing finger follower 14 on one side and a second gap on the other side between the timing finger follower 14 and the axial cut- A second gap may be provided between the first electrode 101 and the second electrode. These two gaps are shown in Figures 3 and 4 as "CLEARANCE ".

This arrangement is advantageous in that, among other advantages, the timing finger follower 14 has a lateral gap on the two sides in a manner articulated relative to the valve 13 and camshaft 11 in the cylinder head 10. [ So that its faces are oriented in the axial direction and perform a reciprocating oscillating motion around the axial direction.

The lateral clearance between the axial stops and the finger follower 14 as defined herein is necessary for installation and is necessary to avoid mechanical friction and energy consumption. Although the presence of such a gap may substantially cause wear to be distributed over the stem of the valve 13, such a gap does not have a substantial effect on the timing law, because within the limits of the gap, A slight displacement of the follower 14 means that the point of contact is not always kept the same.

According to a variant (not shown) of an embodiment, each pivot point 15 can serve to mount a timing finger follower 14 that is mounted angularly spaced about the pivot point 15. For this purpose, each pivot point 15 includes, in particular, a single pivot shaft 151 to ensure mounting of the timing finger follower 14 in a sliding pivot connection.

According to a non-limiting embodiment relating to the design freedom of design of the pivot point 15, it is formed independently from the cylinder head 10, in particular from a monoblock or integral single piece, As shown in FIG. For this purpose, the pivot point 15 defines a support surface 152, in particular a lower portion thereof, and the support surface is in direct contact with the support surface 102 of the cylinder head 10. This contact ensures a flat support connection of the pivot point 15 to the cylinder head 10.

Moreover, this arrangement includes elements for fixing the pivot point 15 to the cylinder head 10, which first comprises at least one centering stud 16 and at least one fixing screw 16, 17 so as to immobilize the pivot point 15 relative to the cylinder head 10 at a defined location by mechanical cooperation between each centering stud 16 and the cylinder head 10, Each of the centering studs 16 and each of the securing screws 17 passes through the passage openings 153,154,156 disposed through the pivot point 15. [

4, the elements for securing the pivot point 15 to the cylinder head 10 include the two centering studs 16 shown in FIG. 4 such that the pivot point 15 is located at the center of the cylinder head 10. In the embodiment shown in FIG. 4, So that the precision placed on the substrate 10 can be obtained.

The opening 153 through which the centering stud 16 passes and the opening 156 through which the fastening screw 17 passes may have a circular cross section. However, the opening 154 through which the other centering stud 16 passes may have an oblong cross-section, the length of which is oriented in the pivot direction of the finger follower 14.

Preferably, the pivot point 15 is parallel to the camshaft 11. The parallelism can be adjusted through the fixing elements or through any other suitable member.

According to a particular embodiment, on the side opposite the area for connection to the pivot point 15, each timing finger follower 14 is in mechanical contact with the cam 111 and on the stem of the valve 13 The valve is intended to be actuated by translational motion by the oscillating motion of the timing finger follower 14, An adjustment lug 18 interposed between the valve 13 and the timing finger follower 14 may be included on the stem of the valve 13.

In contrast to the prior art rocker arm 4 in which the individual supports for the camshaft 3 and the valve 1 are disposed on both sides of the pivot point 5 of the rocker arm 4, The individual mechanical supports for the camshaft 11 and the valve 13 can be placed in a single identical area for each timing finger follower 14 in the solution described, To be placed in the region disposed at the end of the finger follower 14 opposite the end pivoting about the axis 15. As a result, it is very simple and saves space.

In a non-limiting embodiment, the pivot point 15, centering stud 16 and timing finger follower 14 are preferably made of steel. The pivot point 15 may be heat treated to reduce wear on the shaft 151 and may in some cases be coated with a coating or deposit, especially coated with a carbon material obtained in the form of a thin layer, For example, DLC (diamond-like carbon) type.

The configuration presented here can be fitted as follows.

Preferably, at least one timing finger follower is here held at the same time as two timing finger followers 14, prior to being secured to the cylinder head 10 by being screwed through a fixing screw 17 The pivot point 15 is constructed. The pivot point 15 is positioned parallel to the camshaft 11 as much as possible through at least one centering stud 16 provided at its end.

After installing the valves 13 in the cylinder head 10, the finger followers 14 are mounted on the pivot point 15 by the shafts 151. The assemblies are then placed on the face 102 of the cylinder head 10 where the two centering studs 16 and the fixing screws 17 block the pivot point 15 against the cylinder head 10 To be guaranteed.

The timing finger followers 14 are pivoted about a respective shaft 151 and each of the timing finger followers is preferentially positioned by a wall 101 of the cylinder head 10 and by an appropriate element of the pivot point 15 itself So that the translation is axially blocked on the shaft 151, thereby avoiding the use of any other portion beyond the configuration defined herein.

This solution allows the two timing finger followers 14 to be advantageously held by a single component of the pivot point 15 and a single screw 17. As a result, there is a very advantageous reduction in parts, allowing for savings in space, weight, manufacturing costs and installation costs.

The solution described here has the advantage that it is simultaneously easy to integrate into a situation where the design and performance are simple, economical, reliable, and the space in the cylinder head is reduced.

10. Cylinder head 11. Camshaft
12. Head cover 13. Valve
15. Pivot point 14. Timing finger follower

Claims (11)

The internal combustion engine includes a cylinder head 10, a camshaft 11 that rotates with respect to the cylinder head 10, a cylinder head 10 that is fixed to the cylinder head 10 and is offset at least with respect to the rotational axis of the camshaft 11. [ One pivot point 15 and an intake valve and an exhaust valve 13 of the internal combustion engine and is mounted on the pivot point 15 so as to be pivotable by a rotation cam 111 of the camshaft 11, (14) that operates as an oscillatory rocking movement about a longitudinal axis (15) of the vehicle, wherein the timing finger follower (14)
The axial stops of the timing finger follower 14 along the pivot point 15 are connected to the axial blocking wall 101 defined by the cylinder head 10 on one side and the pivot point 15 on the other side And the vehicle body. The method according to claim 1,
On the side facing the axial blocking wall 101 with respect to the timing finger follower 14, the pivot point 15 defines a shoulder defining an axial blocking surface 157, 157) and said blocking wall (101) form an axial stop in opposite directions for the timing finger follower (14). 3. The method according to claim 1 or 2,
Characterized in that each pivot point (15) serves to mount two timing finger followers (14) angularly separated from each other about the pivot point (15). 4. The method according to any one of claims 1 to 3,
Each pivot point 15 includes two pivot shafts 151 aligned with each other and each pivot shaft serves to load the corresponding timing finger follower 14 by sliding the pivot connection . 5. The method according to any one of claims 1 to 4,
The axial gap exists between the oscillating arm pivot point 15 and the timing finger follower 14 on one side and between the axial blocking wall 101 and the timing finger follower 14 on the other side, 0.0 > mm < / RTI > to 0.2 mm. 6. The method according to any one of claims 1 to 5,
Characterized in that the pivot point 15 is formed independently from the cylinder head 10, in particular from a monobloc or a single piece of integral type and is fixed to the support surface 102 defined by the cylinder head 10 Lt; / RTI > The method according to claim 6,
The elements that fix the pivot point 15 on the cylinder head 10 primarily include at least one centering stud 16 and at least one secondary fixed screw 17, Immobilizes the pivot point 15 of the oscillating arm relative to the cylinder head 10 at a position formed by mechanical cooperation between the stud 16 and the cylinder head 10, Characterized in that the studs (16) and the respective fixing screws (17) pass through the passage openings (153,154,156) arranged through the pivot points (15) of the oscillating arms. 8. The method according to any one of claims 1 to 7,
Characterized in that the pivot point (15) is parallel to the camshaft (11). 9. The method according to any one of claims 1 to 8,
On the side facing the area for connection to the pivot point 15, each timing finger follower 14 has an area that mechanically contacts the cam 111 and mechanically stresses the stem of the valve 13 Characterized in that the stem of the valve is adapted to act in translational motion by the oscillating motion of the timing finger follower (14). 10. The method of claim 9,
Characterized in that the on-vehicle construct on the stem of the valve (13) comprises an adjustment lug (18) interposed between the valve (13) and the timing finger follower (14). A vehicle comprising at least one vehicle construction according to any one of the preceding claims.

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