KR20110088535A - Drive wheel - Google Patents

Abstract

The present invention provides a rotating shaft 2, a sprocket 1 disposed on the circumferential surface of the drive wheel 20 in the radial direction, and a wall portion extending in the direction of the rotating shaft 2 from the sprocket 1 arranged in the radial direction ( 3) a drive wheel (20) comprising a center bore (5) and a fixed bore (4) provided in the wall portion (3) in the axial direction, and in the wall portion (3) Thereby, setting grooves I, II and III are provided which extend in the direction of the sprocket 1 from the central bore 5 and form different angles to each other.

Description

DRIVE WHEEL}

The present invention relates to a drive wheel having a rotating shaft, a sprocket disposed radially on the circumferential surface of the drive wheel, and a wall portion extending from the radially arranged sprocket in the direction of the rotating shaft, wherein the wall portion includes a center bore, A fixed bore provided in the wall portion in the axial direction.

In order to precisely control the gas exchange valve in the internal combustion engine, for example, a chain drive or a belt drive is used which forms a non-rotatable connection between the crankshaft and the camshaft. Drive wheels flanged to the camshaft can be positioned in various ways, eg "advanced control time" or "retarded control time", to set the control time of the gas exchange valve according to the engine requirements. Can be. Often the various control times are set by the crank angle. The crank angle is, for example, the angle of the crank position measured from the top dead center. For the working stroke, the crank angle for the four-stroke engine is 720 °. These 720 ° angles are divided into four strokes, each with a crank angle of 180 °.

Drive wheels according to the type described above are known from publication US 6,722,221 B2. This publication shows a drive wheel formed as a first circular part having a toothed circumferential surface and rotationally symmetrically arranged openings at its end face, which openings are distributed along the circumferential surface at equal intervals from each other. The second circular part likewise has openings at the end face which are arranged rotationally symmetrically, and these openings are distributed along the circumferential surface in the axial direction at equal intervals. However, the second part includes a larger number of openings than the first part, which makes the spacing of the individual openings to each other narrower than in the first part. When the first part overlaps with the second part, these two parts are of a type and manner in which the opening of the first part and the opening of the second part can be anti-twistedly positioned by a pin, respectively, when twisted with respect to each other. Can overlap.

The object of the present invention is to form a drive wheel that is easy to assemble, reduced in weight and reduced in noise, which can be used for several engine versions with different requirements for the control time to be set.

This object is achieved according to the invention by setting grooves in the wall of the drive wheel which extend in the radial direction from the central bore in the direction of the sprocket and form different angles from each other. By means of different angles between these setting grooves, different crank angles and thus different progressive and perceptual positions can be set directly by only one drive wheel. By this, shorter assembly time is achieved.

Weight reduction at the drive wheels is achieved by providing grooves extending from the central bore to near the sprocket. This, in turn, leads to savings in the material when the drive wheel is produced by sintering or casting.

The set grooves are preferably rotationally asymmetrical with respect to the center bore of the drive wheel or axially asymmetrical with respect to the axis of symmetry penetrating one set groove longitudinally. This structure has the advantage that the generation of vibration in the chain drive is reduced, which in turn improves the generation of noise in the belt drive.

In a preferred embodiment of the invention the drive wheel has a center bore, through which the drive wheel can be arranged in a flange comprising a central journal portion. In this case, the central bore includes a larger diameter than the central journal portion because the drive wheel is fitted over the central journal portion.

In a specific embodiment of the invention, the drive wheel is rotatably supported on the flange, so that the drive wheel is inserted into a pin receiving bore disposed inside the flange and simultaneously into the set groove disposed inside the drive wheel. It is proposed to be supported by a pin that positions the torsionally on the flange.

In order for the drive wheel to maintain its position on the flange after adjustment, the drive wheel comprises a fixed bore inside its wall, which fixed bore interacts with the fixed bore and the fixing means correspondingly arranged in the flange.

According to a further preferred embodiment of the invention, it is proposed that the diameter of the fixed bore in the drive wheel is larger than the diameter of the fixed bore in the flange. When the drive wheel is rotated and twisted about the flange, the position of the fixed bore of the drive wheel also rotates with respect to the position of the fixed bore in the flange. However, the diameter of the fixing bore in the drive wheel must be designed to be enlarged so that the fixing means can be provided not only in the drive wheel but also in the flange through the two fixing bores. Depending on how large the crank angle to be set is, the positions of the aligned fixed bores vary somewhat from each other. Therefore, when the drive wheel has a greater crank adjustment angle, it is also recommended to design the fixed bore in the drive wheel as an arc-shaped groove.

Embodiments of the invention are shown in the drawings described in detail below, and the invention is not limited to these embodiments.

1 is a front view showing a camshaft flange.
FIG. 2 is a view showing a driving wheel having a sprocket surrounding the periphery and a setting groove provided in the wall portion with the crank angle adjusted by 2 °.

1 shows the end face of a camshaft flange 10 with a central journal portion 7 extending in the axial direction at the center. The fixed bores 4 'are arranged on the circular track around the central journal portion 7 at equal intervals from each other. Like the stationary bores 4 ', the pin receiving bores 6a, 6b, 6c are also located on a circular orbit about the central journal portion 7. The pin receiving bores 6a, 6b, 6c each form an angle of 120 ° to each other.

2 shows a drive wheel 20 having a sprocket 1 arranged on the circumferential surface in the radial direction and a wall portion 3 extending in the direction of the rotation axis 2 from the sprocket 1 arranged in the radial direction. The wall part comprises a central bore 5. Since the diameter of the center bore 5 of the drive wheel 20 is larger than the diameter of the center journal portion 7 of the flange 10, the drive wheel 20 has a center bore 5 and a center journal portion for the first center setting. (7) can be flanged to the end side of the camshaft.

Further, in the wall 3 of the drive wheel 20 there are provided setting grooves I, II and III which extend in the radial direction from the central bore 5 in the direction of the sprocket 1 and form different angles to each other. do. The drive wheel 20 can be adjusted on the flange 10 by setting grooves provided in the wall 3 of the drive wheel 20 .

As shown in the embodiment of FIG. 2, the arrangement of the setting grooves I, II, III enables three different adjustment angles. The set groove I enables an angle of adjustment of 0 degrees, and the set groove II forms an angle of 120 degrees with the set groove III. The setting groove II, which forms an angle of 118 ° with the setting groove I, enables the advancing adjustment of 2 ° on the exhaust side. The setting groove III, which forms an angle of 122 degrees with the setting groove I, enables a perceptual adjustment of 2 degrees on the intake side. The desired adjustment is effected, for example, by a pin 8 inserted in the pin receiving bore 6a of the flange 10 as well as in the set groove I of the drive wheel 20 when the crank angle is 0 °. By selecting differently set positions in this way, it is possible to implement different control times via only one drive wheel 20 . Likewise, an embodiment of the drive wheel 20 , in which the setting grooves I, II, III are arranged in a type and manner in which different areas of the crank angle change are covered, preferably these different areas are between 1 ° and 6 °. Embodiments of the drive wheel located at the crank angle are contemplated.

In order to be able to fix the drive wheel 20 pre-adjusted by the pin 8 to the flange 10 , an additional stationary bore 4 corresponds to a stationary bore 4 ′ disposed inside the flange 10 . It is arranged inside the wall part 3 of the drive wheel 20 . Since the driving wheel 20 rotates in the flange 10, a fixing bore (4), so the diameter is greater than the receiving bore (4 ') the diameter of the flange 10, the fastening means of the driving wheels 20 are drive wheels ( It may be inserted into two receiving bores 4, 4 ′ aligned after the rotation of 20). When implementing a larger adjustment angle, it is also recommended to design the fixed bore 4 of the drive wheel 20 as an arc shaped groove.

1: sprocket
2: axis of rotation
3: wall
4: Fixed Bore of Driving Wheel
4 ': fixed bore of flange
5: center bore
6a: pin receiving bore
6b: pin receiving bore
6c: pin receiving bore
7: central journal
8: pin
Ⅰ: Setting groove
Ⅱ: Setting groove
Ⅲ: Setting Groove
10 : flange
20 : drive wheel

Claims (8)

The rotating shaft 2, the sprocket 1 arranged on the circumferential surface of the drive wheel 20 in the radial direction, and the wall portion 3 extending in the direction of the rotating shaft 2 from the sprocket 1 arranged in the radial direction In the drive wheel 20 provided, wherein the wall portion includes a center bore (5) and a fixed bore (4) provided in the wall portion 3 in the axial direction,
In the wall part 3 is provided a drive wheel, characterized in that set grooves I, II, III are provided which extend in the radial direction from the central bore 5 in the direction of the sprocket 1 and form different angles to each other ( 20). 2. Drive wheel (20) according to claim 1, characterized in that the set grooves (I, II, III) are arranged asymmetrically with respect to the center bore (5). The driving wheel (1) according to claim 2, wherein the set grooves (I, II, III) are arranged axially asymmetrically with respect to the axis of symmetry penetrating one set groove (I, II, III) in the longitudinal direction. 20). 4. The drive wheel according to claim 3, wherein the drive wheel is rotatably supported on the flange (10) and inserted into the pin receiving bores (6a, 6b, 6c) disposed in the flange (10) and provided in the drive wheel (20). A drive wheel (20), characterized in that it is positioned by pins (8) inserted into setting grooves (I, II, III). 2. The drive wheel (20) according to claim 1, wherein the drive wheel (20) comprises a center bore (5) which makes it possible to arrange in a flange (10) comprising a center journal portion (7). 6. The drive wheel (20) according to claim 5, wherein the drive wheel (20) comprises a fixed bore (4), said fixed bore (20) through means of fastening to the flange (10) having a correspondingly arranged fixed bore (4 '). Drive wheel 20, characterized in that it is provided for positioning. 7. The drive wheel (20) according to claim 6, wherein the fixed bore (4) of the drive wheel (20) comprises a larger diameter than the fixed bore (4 ') of the flange (10). The drive wheel (20) according to any one of the preceding claims, characterized in that the drive wheel (20) is formed as a chain wheel for the traction mechanism drive of the internal combustion engine.

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