JP6800959B2 - Camshaft regulator - Google Patents

Description

The present invention is an actuating device suitable for a camshaft regulator of an internal combustion engine, wherein the actuating device is a housing, an input vehicle coupled to the housing, and a regulated transmission, particularly a three-axis transmission, such as a wave. The present invention relates to an actuator having a (wave) transmission and an output element provided for coupling to a shaft, particularly a camshaft of an internal combustion engine.

Such actuating devices in camshaft regulators are known, for example, under US Patent Application Publication No. 2007/0051332 and International Publication No. 2006/018080. Both cases are electrically operable camshaft regulators.

In principle, a rolling bearing device or a plain bearing device is suitable for supporting a rotatable portion inside the camshaft regulator or a rotatable portion coupled to the camshaft regulator by multiple components. .. Based on U.S. Patent Application Publication No. 2013/0081587, camshaft regulators with plain bearing devices are known.

Electrically operated actuating devices in internal combustion engines can be used not only in camshaft regulators, but also in devices that regulate valve stroke and / or compression ratio, for example.

The underlying problem of the present invention is that an operating device suitable for a camshaft regulator can be obtained in a particularly sturdy and reliable bearing device as compared with the known techniques mentioned above, and at the same time, a compact structure can be obtained. It is to improve so that it can be obtained.

According to the present invention, the above problem is solved by an operating device having the characteristics according to claim 1. The advantageous configuration is subject to dependent claims.

A suitable actuator, especially for camshaft regulators, but for other regulators, especially for valve stroke or compression ratio regulation of internal combustion engines, consisted of any number of individual parts. It is driven by a housing, an input wheel that is coupled to or formed as an integral component of the housing, and in particular an operational transmission in the form of a three-axis transmission, such as a wave transmission (wave transmission). It has an output element, which is provided for coupling with a shaft to be, especially a camshaft. A plain bearing device is provided in the housing to support the output element, which is located between the actuation transmission and the input vehicle in the axial direction of the shaft to be driven. ing. A flange is coupled to the output element on the end face side, and this flange protrudes beyond the output element in the radial direction. The plain bearing device is adjacent to a flange that may be part of the actuation transmission; in particular, the plain bearing device is axially located between the flange and the input wheel. Thus, the plain bearing device is housed in the housing with a very small axial spacing from the input vehicle, especially to save space, which results in a smaller effective lever arm length. Based on this, it means that it is less likely to get caught due to tilting.

In a preferred embodiment, the output element is also formed as a stopper disc for the shaft to be driven, especially the camshaft. The stopper disc, which limits the adjustment angle of the shaft to be driven, preferably has a cylindrical notch concentric with respect to the axis of rotation of the input wheel and the output element, within which the relative To form a non-rotatable coupling, the end of the shaft to be driven or an intermediate piece coupled to this shaft can be placed.

In a preferred embodiment, the housing of the actuating device has a plurality of axial grooves and / or at least one groove extending circumferentially in the area of the plain bearing device. Such grooves facilitate the flow of lubricant, especially inside the actuator.

In an improved form of the invention, the actuation transmission has an output ring gear coupled to a flange or an output ring gear integrally formed with the flange, the output ring gear being supported within the housing by a second plain bearing device. ing. The output ring gear may have medial dentition or be tightly coupled to a sleeve-like component with medial dentition. In each case, the double plain bearing device provides a particularly sturdy construction of the actuator. In this case, both plain bearing devices may have different axial extension lengths from each other. Preferably, the first plain bearing located between the actuation transmission and the input wheel in the axial direction has a smaller diameter than the second plain bearing supporting the output ring gear and more than the second plain bearing. It has a large axial extension length. The resulting lever length is shortened again.

The advantage of placing the first plain bearing device in the axial direction between the input wheel and the actuation transmission, especially the wave transmission, is that the dentate components, especially the output ring gear, are slidably supported within the housing. Compared to the plain bearing device, which is possible in principle, it has the following special advantages. That is, given a particularly small lever length as measured in the axial direction of the camshaft regulator, therefore, the unwanted tilting moment inside the camshaft regulator that potentially increases friction is at most small. It only occurs in.

At least one plain bearing device of the actuating device may have a coating that reduces friction and / or wear. It is also possible to incorporate a lubricant into the sliding material or impregnate a corresponding material with the lubricant, thus providing a lubricant compound that is particularly favorable in terms of friction technology.

Hereinafter, a plurality of embodiments of the present invention will be described in detail with reference to the drawings.

It is sectional drawing which shows 1st Embodiment of the actuating device for a camshaft adjuster. It is a perspective view which shows one variation of the component part used for the actuating device of a camshaft adjuster. It is a perspective view which shows another variation of the component used for the actuating device of a camshaft adjuster. It is the same figure as FIG. 1 which shows the 2nd Embodiment of the actuating device of a camshaft adjuster. It is the same figure as FIG. 1 and FIG. 4 which shows the non-patented structure of the actuating device of a camshaft adjuster. It is a diagram which shows the comparison between the actuating device shown in FIG. 1 and the actuating device shown in FIG.

In the following, FIG. 5 will be described first. FIG. 5 shows a non-patentable structure of the actuating device 1 of the camshaft regulator of an internal combustion engine, which is possible in principle. In general, in the embodiments related to FIG. 5 and shown in FIGS. 1 to 4, the same reference numerals are used for parts having the same function in principle.

What is common to the actuating devices 1 illustrated in the various drawings is that the actuating device 1 has a housing 2 and the dentition-equipped input wheel 3 is an integral component of the housing 2. It is tightly coupled to the housing components. The input wheel 3 is driven by a crankshaft of an internal combustion engine in a form known per se via a tensile means (not shown), ie a chain or a toothed belt. In principle, it is also conceivable to drive the actuator 1 via a shaft (Koenigswelle) having gears at both ends, such as a plurality of gears and / or bevel gear towers.

An operation transmission device 4 is provided inside the housing 2. The operation transmission device 4 is configured as a three-axis transmission device, that is, a wave transmission device (wave transmission device). An operating shaft 5 is additionally provided with respect to the input vehicle 3, and the operating shaft 5 is operated by an electric motor (not shown) of a camshaft adjuster. When the shaft of the electric motor rotates at the same rotation speed as the camshaft of the internal combustion engine (also not shown), the phase relationship between the camshaft of the internal combustion engine and the crankshaft remains constant. .. The operation transmission device 4 is a transmission device having a high reduction ratio, and a relatively small change in the phase relationship between the camshaft and the crankshaft occurs due to the rotation speed deviation between the camshaft and the operation shaft 5.

An input ring gear 6 located inside the housing 2 is firmly coupled to the housing 2 and thus to the input vehicle 3. The input ring gear 6 functions as an input shaft of the operation transmission device 4. The rotation of the input ring gear 6 is converted into the rotation of the output ring gear 7 by the operation transmission device 4. Since the output ring gear 7 may have an angular velocity different from the angular velocity of the housing 2 (that is, in the case of adjusting the camshaft), the slide bearing device 8 is formed between the output ring gear 7 and the housing 2 inside the housing 2. Is provided. The output ring gear 7 transmits its rotation to the output element 10 via the flange 9. The output ring gear 7 may be integrally formed with the flange 9. The output element 10 is formed as a stopper disc in any of the illustrated structures (whether in claims or in non-patented cases). This stopper disc can be coupled to the camshaft and limits the adjustment angle of the camshaft. Therefore, the output element 10 always satisfies the dual function.

An axial distance is provided between the central portion of the input wheel 3 when viewed in the axial direction and the central portion of the slide bearing device 8 defined in the same direction. Here, the corresponding lever arm length is indicated by "lk". Comparing FIG. 5 and FIG. 1, it can be seen that the lever arm length lk is significantly longer in the case of FIG. 5 than in the case of FIG. This is less preferable in terms of mechanical load and friction generation.

In the embodiment shown in FIG. 1, the plain bearing device 8 is arranged axially between the actuating transmission 4 and the input wheel 3, which is large in order to obtain a small lever arm length lk. Contribute. The slide bearing device 8 is formed between the output element 10 and the transmission device component indicated by reference numeral 11 as a whole, including the input wheel 3 having a dentition. The flange 9 arranged on the end face side of the output element 10 is coupled to both the output ring gear 7 and the output element 10 so as not to rotate relative to each other, and the output ring gear 7, the output element 10 and the camshaft have a common rotation. It protrudes beyond the output element 10 in the radial direction with respect to the axis. The output ring gear 7 is coupled to the flange 9 on the peripheral surface of the flange 9, that is, the output ring gear 7 is arranged radially outside the flange 9.

2 and 3 show various variations of the transmission component 11 that can be used in the camshaft regulator 1 shown in FIG. 1, respectively. In the case of FIG. 2, it can be seen that a plurality of axial grooves 12 are provided on the inner peripheral surface of the transmission device component 11 forming the bearing surface of the slide bearing device 8. On the other hand, in the case of FIG. 3, the groove extending in the axial direction is not provided in the region of the slide bearing device 8. However, in the region of the slide bearing device 8, one groove 13 extending in the circumferential direction is provided on the inner peripheral surface of the transmission device component 11. Similar to the axial groove 12 in the case of FIG. 2, the groove 13 not only promotes the distribution of the lubricant, but also reduces the bearing surface of the slide bearing device 8 by the annular groove 13 extending in the circumferential direction. It also facilitates processing.

FIG. 4 shows a further developed embodiment of the actuating device 1 of the camshaft regulator. In this case, another slide bearing device 14 is additionally provided to the slide bearing device 8 located between the input vehicle 3 and the operation transmission device 4, that is, the wave transmission device in the axial direction. I understand. Using this plain bearing device 14, the output ring gear 7 is slidably supported in the housing 2 so as to be comparable to the structure shown in FIG. Therefore, particularly stable double plain bearing devices 8 and 14 are provided. The diameter of the second plain bearing device 14 is larger than the diameter of the first plain bearing device 8. At the same time, the extending length of the first primary plain bearing device 8 in the axial direction of the operating device 1 is based on the extending length of the second secondary plain bearing device 14 measured in the same direction. Is also big.

The diagram shown in FIG. 6 relates to a comparison between the actuating device 1 shown in FIG. 1 and the structure shown in FIG. Here, "K" represents a tension means for driving the input vehicle 3, that is, a chain force acting on the chain. “L” represents the bearing friction in the plain bearing device 8. The upper alternate long and short dash line in FIG. 6 relates to the non-patentable structure shown in FIG. The dashed line on the lower side relates to the embodiment shown in FIG. It can be clearly seen that the bearing friction of the embodiment shown in FIG. 1 is reduced in all operating states. In principle, the same relationship can be said for comparison between the embodiment shown in FIG. 4 and the structure shown in FIG.

1 Activator 2 Housing 3 Input wheel 4 Actuating transmission device 5 Actuating shaft 6 Input ring gear 7 Output ring gear 8 First slide bearing device 9 Flange 10 Output element 11 Transmission device component 12 Axial groove 13 Circular groove 14 Second Plain bearing device lk lever arm length K chain force

Claims (10)

It is an operating device for the shaft of an internal combustion engine.
Housing (2) and
The input wheel (3) coupled to the housing (2) and
Operation transmission device (4) and
An output element (10) provided for coupling with the shaft to be driven,
A slide bearing device (8) provided in the housing (2) to support the output element (10), and
In the operating device equipped with
The output element (10) is a shaft of a shaft to be driven by a flange (9) which is connected to the output element (10) so as to be relatively non-rotatable and protrudes beyond the output element (10) in a radial direction. Seen in the axial direction, it is held between the operation transmission device (4) and the input vehicle (3), and the slide bearing device (8) is adjacent to the flange (9) and is the input vehicle. An actuating device for a shaft of an internal combustion engine, characterized in that it is arranged on the side of (3) . The operation transmission device (4) has an output ring gear (7) coupled to the flange (9), and the output ring gear (7) is provided by a second slide bearing device (14) to the housing (2). The actuating device of claim 1, characterized in that it is supported within. The actuating device according to claim 2, wherein the plain bearing devices (8, 14) have different diameters from each other. The actuating device according to claim 2 or 3, wherein the plain bearing devices (8, 14) have different axial extending lengths from each other. The first plain bearing (8) arranged between the operation transmission device (4) and the input wheel (3) in the axial direction has a smaller diameter than the second plain bearing (14) and a second. The actuating device according to claim 3 or 4, characterized in that it has an axial extending length larger than that of the plain bearing (14). The actuating device according to any one of claims 1 to 5, wherein the output element (10) is formed as a stopper disc that limits an adjustment angle of a shaft to be driven. The actuating device according to any one of claims 1 to 6, wherein the actuating transmission device (4) is configured as a three-axis transmission device, particularly a wave transmission device. The actuating device according to any one of claims 1 to 7, wherein the housing (2) has a plurality of axial grooves (12) in the region of the slide bearing device (8). The invention according to any one of claims 1 to 8, wherein the housing (2) has at least one groove (13) extending in the circumferential direction in the region of the slide bearing device (8). Actuator. The operation device according to any one of claims 1 to 9, wherein the operating device is a part of an electric camshaft regulator or a part of a device for changing the compression ratio of an internal combustion engine. Actuator.

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