WO2021014533A1

WO2021014533A1 - Reduction gear and variable valve timing device

Info

Publication number: WO2021014533A1
Application number: PCT/JP2019/028661
Authority: WO
Inventors: 木下　淳
Original assignee: 三菱電機株式会社
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2021-01-28
Also published as: JP7186881B2; JPWO2021014533A1

Abstract

A reduction gear (1) is provided with: a driving-side rotor (10) that rotates in association with a crankshaft of an internal combustion engine; a driven-side rotor (20) that is fixed to a camshaft (40) for opening/closing a valve of the internal combustion engine; a planetary rotor (30) that executes planetary motion while being in engagement with the driving-side rotor (10) and the driven-side rotor (20), and adjusts the opening/closing timing of the valve by changing the rotational phase of the driven-side rotor (20) relative to the driving-side rotor (10); a sliding surface (22) that constitutes the outer circumferential surface of the driven-side rotor (20) and that is slidably supported on the inner circumferential surface of the driving-side rotor (10) when the rotational phase of the driven-side rotor (20) relative to the driving-side rotor (10) changes; and an oil path (23) that is provided to the driven-side rotor (20), that is open to the sliding surface (22), and through which lubricating oil introduced from the camshaft (40) is supplied to the sliding surface (22).

Description

Reducer and variable valve timing device

The present invention relates to a speed reducer and a variable valve timing device including the speed reducer.

Conventionally, a variable valve timing device that adjusts the opening / closing timing of an intake valve or an exhaust valve (hereinafter, simply referred to as a valve) according to the operating condition of an internal combustion engine has been provided. Patent Document 1 discloses, for example, an electric variable valve timing device.

Japanese Unexamined Patent Publication No. 2017-172442

The variable valve timing device disclosed in Patent Document 1 has a speed reducer. In this speed reducer, a drive-side rotating body that rotates in conjunction with the crankshaft of an internal combustion engine and a driven-side rotating body that rotates in conjunction with a camshaft are moved by a planetary rotating body driven by an electric motor. And are connected. As a result, the conventional variable valve timing device adjusts the valve opening / closing timing by changing the relative rotation phase of the driven side rotating body with respect to the driving side rotating body by the planetary motion of the planetary rotating body.

When the driven side rotating body rotates relative to the driving side rotating body, the sliding surface forming the outer peripheral surface of the driven side rotating body slides on the inner peripheral surface of the driving side rotating body. Therefore, lubrication is required between the inner peripheral surface of the driving side rotating body and the sliding surface of the driven side rotating body. The variable valve timing device disclosed in Patent Document 1 supplies lubricating oil from a chamber provided on the inner peripheral side of the driven side rotating body to the sliding surface through the inside of the driven side rotating body.

Since the chamber communicates with the meshing portions of the gears and the bearings, the lubricating oil stored in the chamber is supplied to the sliding surface after being used for lubricating them. Therefore, the amount of lubricating oil supplied to the sliding surface is reduced, and there is a possibility that wear debris generated in the meshing portion and the bearing may be mixed in the lubricating oil.

The present invention has been made to solve the above problems, and it is possible to supply a lubricating oil containing no abrasion powder to the sliding surface of the driven side rotating body in a sufficient supply amount. The purpose is to provide a speed reducer.

The speed reducer according to the present invention includes a drive side rotating body that rotates in conjunction with the crankshaft of the internal combustion engine, a driven side rotating body fixed to a cam shaft for opening and closing a valve of the internal combustion engine, and a driving side rotating body. And the planetary rotating body that adjusts the opening and closing timing of the valve by performing planetary motion while meshing with the driven side rotating body and changing the relative rotation phase of the driven side rotating body with respect to the driving side rotating body, and the driven side rotating body. A sliding surface that is slidably supported by the inner peripheral surface of the driving side rotating body and a driven side rotating when the relative rotation phase of the driven side rotating body with respect to the driving side rotating body changes. It is provided on the body and is provided with an oil passage that opens in the sliding surface and supplies the lubricating oil introduced from the cam shaft to the sliding surface.

According to the present invention, a lubricating oil containing no abrasion powder can be supplied to the sliding surface of the driven side rotating body in a sufficient supply amount.

It is a vertical sectional view of the variable valve timing apparatus provided with the reduction gear which concerns on Embodiment 1. FIG. It is an enlarged view of the main part of FIG. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is an enlarged view of the main part corresponding to FIG. 2 when the groove part is provided. It is a vertical sectional view of the variable valve timing apparatus provided with the reduction gear which concerns on Embodiment 2. FIG. It is an enlarged view of the main part of FIG. FIG. 5 is a cross section taken along the line BB in FIG. It is an enlarged view of the main part corresponding to FIG. 6 when the groove part is provided.

Hereinafter, in order to explain the present invention in more detail, a mode for carrying out the present invention will be described with reference to the accompanying drawings.

Embodiment 1.
The speed reducer 1 according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a vertical sectional view of a variable valve timing device including the speed reducer 1 according to the first embodiment. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is an enlarged view of a main part corresponding to FIG. 2 when the groove portion 26 is provided. The arrow shown in FIG. 2 indicates the flow direction of the lubricating oil.

The variable valve timing device shown in FIG. 1 adjusts the valve opening / closing timing according to the operating condition of the internal combustion engine (not shown). This variable valve timing device is an electric variable valve timing device, and includes a speed reducer 1, an electric motor 3, and the like. The internal combustion engine is, for example, a vehicle engine or the like.

The speed reducer 1 is provided on a transmission path for transmitting engine torque from the crankshaft (not shown) of the internal combustion engine to the camshaft 40. The speed reducer 1 changes the relative rotation phase between the crankshaft and the camshaft 40.

As shown in FIGS. 1 to 3, the speed reducer 1 includes a driving side rotating body 10, a driven side rotating body 20, and a planetary rotating body 30. The driving side rotating body 10, the driven side rotating body 20, and the planetary rotating body 30 are arranged coaxially.

The drive-side rotating body 10 has a tubular shape as a whole, and houses the driven-side rotating body 20 and the planetary rotating body 30 inside in the radial direction thereof. The drive-side rotating body 10 has a gear member 11 and a sprocket member 12. The gear member 11 and the sprocket member 12 both have a tubular shape and are arranged coaxially. The gear member 11 and the sprocket member 12 are fixed by bolts 13.

The gear member 11 is arranged on the electric motor 3 side in the drive side rotating body 10. The gear member 11 has an annular internal gear portion 11a. The internal gear portion 11a is provided on the inner peripheral surface of the gear member 11 over the entire circumferential direction.

The sprocket member 12 is arranged on the cam shaft 40 side in the drive side rotating body 10. The sprocket member 12 supports the driven side rotating body 20 so as to be relatively rotatable with respect to the driving side rotating body 10 on the inner side in the radial direction. Further, the sprocket member 12 has a plurality of sprocket teeth 12a and a support surface 12b.

The sprocket teeth 12a are provided so as to project outward from the outer peripheral surface of the sprocket member 12, and are arranged at equal intervals in the circumferential direction of the outer peripheral surface. On the other hand, a plurality of sprocket teeth are provided at the end of the crankshaft. These sprocket teeth are provided so as to project from the outer peripheral surface of the crankshaft toward the outside thereof, and are arranged at equal intervals in the circumferential direction of the outer peripheral surface. An annular timing chain is wound between the plurality of sprocket teeth 12a on the sprocket member 12 and the plurality of sprocket teeth on the crankshaft.

Therefore, when the internal combustion engine is operated and the crankshaft rotates, the engine torque output from the crankshaft is input to the sprocket member 12 through the timing chain. As a result, the drive-side rotating body 10 rotates around the central axis L of the speed reducer 1 in conjunction with the crankshaft.

The support surface 12b constitutes a tubular inner peripheral surface of the sprocket member 12. The support surface 12b is arranged in parallel with the central axis L of the speed reducer 1. Further, the support surface 12b slidably supports the sliding surface 22 of the driven side rotating body 20 that rotates relative to the driving side rotating body 10. The details of the sliding surface 22 will be described later.

The driven side rotating body 20 has a tubular shape and is arranged coaxially with the cam shaft 40. The driven side rotating body 20 has a fixing portion 21, a sliding surface 22, an oil passage 23, and an internal gear portion 24.

The fixing portion 21 forms the bottom portion of the driven side rotating body 20, and is fixed to the end portion of the cam shaft 40 by the bolt 25. As a result, the cam shaft 40 rotates around the central axis L of the speed reducer 1 in conjunction with the driven side rotating body 20.

The sliding surface 22 constitutes a tubular outer peripheral surface of the driven side rotating body 20. The sliding surface 22 is arranged parallel to the central axis L of the speed reducer 1. Further, the sliding surface 22 is slidably supported by the support surface 12b when the driven side rotating body 20 rotates relative to the driving side rotating body 10.

As shown in FIG. 3, in the following description, the relative rotation direction in which the driven side rotating body 20 advances with respect to the driving side rotating body 10 is referred to as an advance angle direction X. Further, the relative rotation direction in which the driven side rotating body 20 retards with respect to the driving side rotating body 10 is referred to as a retard angle direction Y.

The oil passage 23 is a passage for directly supplying the lubricating oil introduced from the cam shaft 40 to the sliding surface 22. The oil passage 23 is provided inside the fixing portion 21. One end of the oil passage 23 communicates with the inside of the cam shaft 40, and the other end of the oil passage 23 opens from the radial inside of the driven side rotating body 20 with respect to the sliding surface 22.

On the other hand, the camshaft 40 has a pump 41 and an oil passage 42. The pump 41 is a pump for introducing lubricating oil into the oil passage 42. The oil passage 42 is a passage for supplying lubricating oil to the oil passage 23 of the driven side rotating body 20. One end of the oil passage 42 is connected to the pump 41, and the other end of the oil passage 42 is connected to one end of the oil passage 23. The

oil passages

23 and 42 are always in direct communication. As a result, the lubricating oil is introduced into the oil passage 42 by the drive of the pump 41, and then supplied to the sliding surface 22 through the oil passage 23.

The internal gear portion 24 has an annular shape. The internal gear portion 24 is provided on the inner peripheral surface of the driven side rotating body 20 over the entire circumferential direction.

The planetary rotating body 30 has a tubular shape, and is provided so as to straddle the inner peripheral side of the gear member 11 and the inner peripheral side of the driven side rotating body 20. The planetary rotating body 30 has a planetary carrier 31, a planetary gear 32, and planetary bearings 33 to 35.

The planetary carrier 31 has a tubular shape and is arranged in the center of the speed reducer 1. The output shaft 3a of the electric motor 3 is coaxially fitted in the center hole of the planetary carrier 31. Therefore, when the electric motor 3 is driven and the output shaft 3a rotates, the control torque output from the output shaft 3a is input to the planet carrier 31. As a result, the planetary carrier 31 rotates around the central axis L of the speed reducer 1 in conjunction with the output shaft 3a.

Further, the planetary carrier 31 is capable of relative rotation with respect to the driving side rotating body 10 and the driven side rotating body 20. The outer peripheral surface of the planetary carrier 31 is eccentric with respect to the central axis L of the speed reducer 1. The planetary gear 32 is an annular external gear, and is arranged on the radial outer side of the planet carrier 31.

The planetary bearing 33 is provided between the outer peripheral surface of the planetary carrier 31 and the inner peripheral surface of the gear member 11. The planetary bearing 34 is provided between the outer peripheral surface of the planetary carrier 31 and the inner peripheral surface of the planetary gear 32. The planetary bearing 35 is provided between the outer peripheral surface of the planetary carrier 31 and the inner peripheral surface of the driven side rotating body 20.

As a result, the planetary carrier 31 rotatably supports the driving side rotating body 10, the driven side rotating body 20, and the planetary gear 32 in a state of being eccentric with respect to the central axis L. The planetary gear 32 meshes with the internal gear portion 11a of the driving side rotating body 10 and the internal gear portion 24 of the driven side rotating body 20. Further, the planetary gear 32 revolves in the rotation direction of the planetary carrier 31 while rotating in an eccentric state with respect to the central axis L, and performs a planetary motion.

The number of teeth of the internal gear portion 24 is set to be larger than the number of teeth of the internal gear portion 11a. Further, the number of teeth of the planetary gear 32 is set to be smaller than the number of teeth of the internal gear portion 11a and the number of teeth of the internal gear portion 24.

Therefore, the variable valve timing device changes the relative rotation phase between the driving side rotating body 10 and the driven side rotating body 20 according to the control torque input from the output shaft 3a of the electric motor 3 to the planetary carrier 31. Thereby, the opening / closing timing of the valve can be adjusted according to the operating condition of the internal combustion engine.

Specifically, when the valve opening / closing timing is not changed, the variable valve timing device controls the electric motor 3 and has the same rotation speed as the rotation speed of the drive-side rotating body 10 that rotates in conjunction with the crankshaft. Then, the planetary carrier 31 is rotated. As a result, the planetary gear 32 performs a planetary motion with the rotation of the planet carrier 31, and its revolution speed matches the rotation speed of the drive-side rotating body 10.

As a result, the planetary gear 32 maintains the meshing position with the internal gear portion 11a and rotates with the driving side rotating body 10 without changing the relative rotation phase with respect to the driving side rotating body 10. Further, the planetary gear 32 maintains the meshing position with the internal gear portion 24 and rotates with the driven side rotating body 20 without changing the relative rotation phase with respect to the driven side rotating body 20.

Therefore, the relative rotation phase of the camshaft 40 fixed to the driven side rotating body 20 is not changed, and the valve opening / closing timing is not changed. That is, the valve opening / closing timing is maintained as it is.

When changing the valve opening / closing timing to the advance angle side, the variable valve timing device controls the electric motor 3 to set the direction in which the control torque is generated to the advance angle direction X, with respect to the drive side rotating body 10. The planetary carrier 31 is relatively rotated in the advance direction X.

As a result, the planetary gear 32 performs a planetary motion with the rotation of the planet carrier 31, and a difference is generated between the revolution speed of the planet gear 32 and the rotation speed of the drive side rotating body 10. Therefore, the drive side It rotates while changing the relative rotation phase with respect to the rotating body 10 toward the advance direction X. At this time, since the planetary gear 32 meshes with the internal gear portion 24 of the driven side rotating body 20, the driven side rotating body 20 with respect to the driving side rotating body 10 as the planetary gear 32 rotates. It rotates relative to the advance direction X.

Therefore, the relative rotation phase of the camshaft 40 fixed to the driven side rotating body 20 also changes in the advance angle direction X, so that the valve opening / closing timing changes to the advance angle side.

When changing the valve opening / closing timing to the retard side, the variable valve timing device controls the electric motor 3 to set the direction in which the control torque is generated to the retard direction Y, with respect to the drive side rotating body 10. The planetary carrier 31 is relatively rotated in the retard direction Y.

As a result, the planetary gear 32 performs a planetary motion with the rotation of the planet carrier 31, and a difference is generated between the revolution speed of the planet gear 32 and the rotation speed of the drive side rotating body 10. Therefore, the drive side It rotates while changing the relative rotation phase with respect to the rotating body 10 in the retard direction Y. At this time, since the planetary gear 32 meshes with the internal gear portion 24 of the driven side rotating body 20, the driven side rotating body 20 with respect to the driving side rotating body 10 as the planetary gear 32 rotates. It rotates relative to the retard direction Y.

Therefore, the relative rotation phase of the camshaft 40 fixed to the driven side rotating body 20 also changes in the retard direction Y, so that the valve opening / closing timing changes to the retard side.

Here, when the driven side rotating body 20 rotates relative to the driving side rotating body 10, the sliding surface 22 of the driven side rotating body 20 slides on the support surface 12b of the driving side rotating body 10. In this case, if the space between the support surface 12b and the sliding surface 22 is not properly lubricated, the driven side rotating body 20 may not rotate smoothly and may cause rattling, abnormal noise, or the like. ..

On the other hand, in the speed reducer 1 according to the first embodiment, by driving the pump 41, the lubricating oil is supplied to the support surface 12b and the sliding surface 22 via the oil passage 23 of the driven side rotating body 20. Supply between. As a result, the speed reducer 1 can sufficiently lubricate between them, so that the driven side rotating body 20 can be smoothly rotated to prevent rattling and generation of abnormal noise.

At this time, the lubricating oil passing through the oil passage 23 is subjected to a centrifugal force acting on the driven side rotating body 20 in the radial direction as the driven side rotating body 20 rotates. Further, the oil passage 23 extends inside the fixed portion 21 in the radial direction of the driven side rotating body 20. As a result, the lubricating oil quickly flows through the oil passage 23 by centrifugal force and reaches the sliding surface 22.

Further, as shown in FIG. 2, the lubricating oil is formed between the inner peripheral surface of the sprocket member 12 and the outer peripheral surface of the driven side rotating body 20 after lubricating between the support surface 12b and the sliding surface 22. It flows through the gap and flows between the end face of the internal gear portion 11a and the end face of the internal gear portion 24. Next, the lubricating oil flowing between the end faces flows into the meshing portion between the internal gear portion 11a and the planetary gear 32 and the meshing portion between the internal gear portion 24 and the planetary gear 32 to lubricate them. To do. Then, the lubricating oil that lubricates the meshing portion lubricates the planetary bearings 33 to 35.

Further, the lubricating oil lubricated by the planetary bearings 33 to 35 is, for example, a return oil passage provided in at least one of the driving side rotating body 10, the driven side rotating body 20, and the planetary rotating body 30 (not shown). It is returned to the pump 41 via. A filter is provided in the middle of the return oil passage, and the lubricating oil flowing through the return oil passage passes through the filter, so that the meshing portion between the internal gear portion 11a and the planetary gear 32 is inside. The meshing portion between the gear portion 24 and the planetary gear 32 and foreign matter such as wear debris generated in the planetary bearings 33 to 35 are removed.

Then, the lubricating oil from which the foreign matter has been removed is recirculated by driving the pump 41. As a result, clean lubricating oil is always supplied between the support surface 12b and the sliding surface 22.

In the speed reducer 1 according to the first embodiment, the oil passage 23 is directly opened with respect to the sliding surface 22 of the driven side rotating body 20, but as shown in FIG. 4, the sliding surface is opened. The oil passage 23 may be opened in the groove portion 26 formed in the 22. The groove portion 26 is formed so as to extend in the axial direction of the speed reducer 1. The axial length of the groove 26 may be longer than the axial length of the opening cross section of the oil passage 23. As a result, the speed reducer 1 can easily supply the lubricating oil to the entire axial direction between the support surface 12b and the sliding surface 22.

Further, in the speed reducer 1 according to the first embodiment, one oil passage 23 is provided in the driven side rotating body 20, but a plurality of oil passages 23 may be provided in the driven side rotating body 20. As a result, the speed reducer 1 can improve the lubrication between the support surface 12b and the sliding surface 22.

From the above, the speed reducer 1 according to the first embodiment is a driven side fixed to a drive side rotating body 10 that rotates in conjunction with the crankshaft of the internal combustion engine and a cam shaft 40 for opening and closing the valve of the internal combustion engine. The valve is opened and closed by performing planetary motion while meshing with the rotating body 20, the driving side rotating body 10 and the driven side rotating body 20 to change the relative rotation phase of the driven side rotating body 20 with respect to the driving side rotating body 10. The planetary rotating body 30 for adjusting the timing and the outer peripheral surface of the driven side rotating body 20 are formed, and when the relative rotation phase of the driven side rotating body 20 with respect to the driving side rotating body 10 changes, the inside of the driving side rotating body 10 The sliding surface 22 slidably supported on the peripheral surface and the driven side rotating body 20 are provided, and the sliding surface 22 is opened to supply the lubricating oil introduced from the cam shaft 40 to the sliding surface 22. The oil passage 23 is provided. As a result, the speed reducer 1 can supply the lubricating oil containing no wear powder to the sliding surface 22 of the driven side rotating body 20 in a sufficient supply amount.

The oil passage 23 opens from the radial inside of the driven side rotating body 20 with respect to the sliding surface 22. As a result, the speed reducer 1 can quickly supply the lubricating oil flowing through the oil passage 23 to the sliding surface 22 by utilizing the centrifugal force of the driven side rotating body 20.

The variable valve timing device according to the first embodiment includes a speed reducer 1 and an electric motor 3 for rotating the planetary rotating body 30, and sets the relative rotation phase of the driven side rotating body 20 with respect to the driving side rotating body 10 to the electric motor. The opening / closing timing of the valve is adjusted by changing it according to the planetary motion of the planetary rotating body 30 according to the drive of 3. As a result, the variable valve timing device can supply the lubricating oil containing no wear powder to the sliding surface 22 of the driven side rotating body 20 in a sufficient supply amount.

Embodiment 2.
The speed reducer 2 according to the second embodiment will be described with reference to FIGS. 5 to 8. FIG. 5 is a vertical cross-sectional view of the variable valve timing device including the speed reducer 2 according to the second embodiment. FIG. 6 is an enlarged view of a main part of FIG. FIG. 7 is a cross-sectional view taken along the line BB of FIG. FIG. 8 is an enlarged view of a main part corresponding to FIG. 6 when the groove portion 26 is provided. The arrow shown in FIG. 6 indicates the flow direction of the lubricating oil.

As shown in FIGS. 5 to 7, the speed reducer 2 according to the second embodiment replaces the support surface 12b and the sliding surface 22 of the speed reducer 1 according to the first embodiment with the support surface 12c and the sliding surface. It is equipped with 22A. The support surface 12c and the sliding surface 22A are inclined with respect to the central axis L of the speed reducer 2.

Specifically, the drive-side rotating body 10 of the speed reducer 2 has a support surface 12c. The support surface 12c constitutes a tapered inner peripheral surface of the sprocket member 12. The support surface 12c has a tapered shape such that the inner diameter gradually increases as the distance from the cam shaft 40 increases.

The driven side rotating body 20 of the speed reducer 2 has a sliding surface 22A. The sliding surface 22A constitutes a tapered outer peripheral surface of the driven side rotating body 20. The sliding surface 22A has a tapered shape so that the outer diameter gradually increases as the distance from the cam shaft 40 increases. Further, the sliding surface 22A is slidably supported by the support surface 12c when the driven side rotating body 20 rotates relative to the driving side rotating body 10.

As described above, the speed reducer 2 provides the driven side rotating body 20 with the sliding surface 22A which is a tapered surface, so that the lubricating oil supplied from the oil passage 23 to the sliding surface 22A is supplied to the driven side rotating body 20. By utilizing the centrifugal force of the above, it can be easily flowed toward the

internal gear portions

11a and 24 and the planetary gear 32 side. As a result, the speed reducer 2 can improve the lubrication of the

internal gear portions

11a and 24 and the planetary gear 32.

Further, when the sliding surface 22A is provided, it is preferable that the oil passage 23 is opened closer to the camshaft 40 than the axial intermediate position on the sliding surface 22A. As a result, the speed reducer 2 can distribute the lubricating oil supplied from the oil passage 23 to the sliding surface 22A over the entire inclined sliding surface 22A by utilizing the centrifugal force of the driven side rotating body 20. .. Further, the lubricating oil supplied from the oil passage 23 to the sliding surface 22A is used without waste because the sliding surface 22A does not flow down toward the cam shaft 40 side due to the action of centrifugal force. ..

In the speed reducer 2 according to the second embodiment, the oil passage 23 is directly opened with respect to the sliding surface 22A of the driven side rotating body 20, but as shown in FIG. 8, the sliding surface is opened. The oil passage 23 may be opened in the groove portion 26 formed in the 22A.

From the above, the speed reducer 2 according to the second embodiment includes a sliding surface 22A formed so that the outer diameter gradually increases as the distance from the cam shaft 40 increases. As a result, the speed reducer 2 can improve the lubrication of the

internal gear portions

11a and 24 and the planetary gear 32.

The oil passage 23 opens closer to the camshaft 40 than the axially intermediate position on the sliding surface 22A. As a result, the speed reducer 2 can distribute the lubricating oil supplied from the oil passage 23 to the sliding surface 22A over the entire inclined sliding surface 22A by utilizing the centrifugal force of the driven side rotating body 20. ..

In the present invention, within the scope of the invention, any combination of embodiments, modification of any component in each embodiment, or omission of any component in each embodiment can be omitted. It is possible.

The speed reducer according to the present invention is provided with an oil passage for supplying the lubricating oil introduced from the camshaft to the sliding surface of the driven side rotating body, so that the sliding surface is provided with a lubricating oil that does not contain wear debris. Can be supplied in a sufficient supply amount, and is suitable for use in a speed reducer or the like of a variable valve timing device.

1, 2, reducer, 3 electric motor, 3a output shaft, 10 drive side rotating body, 11 gear member, 11a internal gear part, 12 sprocket member, 12a sprocket tooth, 12b, 12c support surface, 13 bolt, 20 driven side rotation Body, 21 fixed part, 22, 22A sliding surface, 23 oil passage, 24 internal gear part, 25 bolt, 26 groove part, 30 planetary rotating body, 31 planetary carrier, 32 planetary gear, 33-35 planetary bearing, 40 camshaft , 41 pump, 42 oil passage, L central axis.

Claims

A drive-side rotating body that rotates in conjunction with the crankshaft of an internal combustion engine,
A driven side rotating body fixed to a camshaft for opening and closing the valve of the internal combustion engine, and
The opening / closing timing of the valve is adjusted by performing planetary motion while engaging with the driving side rotating body and the driven side rotating body to change the relative rotation phase of the driven side rotating body with respect to the driving side rotating body. Planetary rotating body and
It constitutes the outer peripheral surface of the driven side rotating body, and is slidably supported on the inner peripheral surface of the driving side rotating body when the relative rotation phase of the driven side rotating body with respect to the driving side rotating body changes. Sliding surface and
A speed reducer provided on the driven side rotating body and provided with an oil passage that opens in the sliding surface and supplies lubricating oil introduced from the cam shaft to the sliding surface.
The speed reducer according to claim 1, wherein the sliding surface is formed so that the outer diameter gradually increases as the distance from the cam shaft increases.
The speed reducer according to claim 2, wherein the oil passage opens toward the camshaft side of the axially intermediate position on the sliding surface.
The speed reducer according to claim 1, wherein the oil passage opens from the radial inside of the driven side rotating body with respect to the sliding surface.
The speed reducer according to any one of claims 1 to 4.
It is equipped with an electric motor that rotates the planetary rotating body.
The valve opening / closing timing is adjusted by changing the relative rotation phase of the driven-side rotating body with respect to the driving-side rotating body by the planetary motion of the planetary rotating body in response to the drive of the electric motor. Variable valve timing device.