WO2021093379A1

WO2021093379A1 - Rotor for camshaft phase modulator and camshaft phase modulator

Info

Publication number: WO2021093379A1
Application number: PCT/CN2020/105857
Authority: WO
Inventors: 周亮; 林建刚
Original assignee: 舍弗勒技术股份两合公司
Priority date: 2019-11-14
Filing date: 2020-07-30
Publication date: 2021-05-20
Also published as: CN112796849B; CN112796849A

Abstract

Disclosed is a rotor for a camshaft phase modulator. The rotor can form a first pressure chamber and a second pressure chamber spaced from each other in the circumferential direction with a stator of the camshaft phase modulator at the radial outer side. The rotor comprises an axial through hole (16) used for accommodating a central valve, and can form a first annular cavity and a second annular cavity spaced from each other in the axial direction with the central valve at the radial inner side. The rotor comprises a first channel (13) in communication with the first pressure chamber and the first annular cavity, and a second channel (14) in communication with the second pressure chamber and the second annular cavity. At least one of the first channel and the second channel comprises: a radial section (13a) leading from the corresponding pressure chamber to the radial inner side of the rotor in a radial plane, wherein the radial plane gets closer to an axial center of the rotor than the corresponding annular cavity in the axial direction; and an axial section (13b) in communication with the radial section and the corresponding annular cavity along the axial direction. Also disclosed is a camshaft phase modulator comprising the rotor. A smaller axial size of the rotor can be achieved by configurations of the radial section and the axial section.

Description

Rotor and camshaft phase modulator for camshaft phase modulator

Cross-references to related applications

This application claims the priority of the Chinese patent application 201911110533.4 entitled "Rotor and Camshaft Phase Modulator for Camshaft Phase Modulator" filed on November 14, 2019. The entire content of this application is incorporated by reference. In this article.

Technical field

This application relates to the field of variable cam timing, in particular to a rotor used in a camshaft phase modulator and the camshaft phase modulator itself.

Background technique

In a motor vehicle, according to the current operating conditions of the internal combustion engine, the phase between the crankshaft and the camshaft can be adjusted with the help of the camshaft phase modulator to adjust the valve valve phase, thereby achieving beneficial effects, such as reducing fuel consumption and The production of harmful substances.

A camshaft phase modulator is disclosed in European Patent EP 1596040B1. The camshaft phase modulator has a driving wheel driven by a crankshaft, also called a stator or an outer rotor; and a driven wheel fixedly installed on the camshaft or the flange part of the camshaft, also called a rotor or an inner rotor. The rotor is driven by the stator through a hydraulic actuator. The actuator includes at least a pair of interacting hydraulic pressure chambers. The central valve controls the delivery of the hydraulic medium to the corresponding pressure chamber via the corresponding hydraulic medium channel, thereby driving the rotor to face each other. The deflection of the stator allows the camshaft to be hydraulically adjusted independently of the crankshaft, thereby adjusting the air distribution phase to obtain the optimal air distribution effect.

Chinese Patent CN 103867247 B discloses a camshaft phase modulator, in which a central valve passes through the radial inner part of the rotor of the camshaft phase modulator and is connected to the camshaft. Here, an assembly part for the camshaft is provided on the axial end side of the rotor. The central valve has a first working port and a second working port for supplying hydraulic pressure. Two rows of passages for the circulation of hydraulic medium are arranged inside the rotor, and each row of passages are arranged at intervals along the circumference of the rotor, and the two rows of passages respectively form a first rotor interface and a second rotor interface on the radial inner side. Two annular cavities spaced apart from each other in the axial direction are formed between the central valve and the rotor. One annular cavity connects the first working interface with each first rotor interface, and the other annular cavity connects the second working interface with each second rotor interface. The rotor interface is connected.

In the existing camshaft phase modulator, there is a need to reduce the axial size of the camshaft phase modulator or the rotor. However, the sealing requirements between the two annular cavities must be considered in the design, that is, a certain axial distance between the two annular cavities must be ensured. In addition, in some embodiments, as described in the above cited document Chinese Patent CN 103867247 B, it is necessary to provide an assembly part for accommodating the camshaft or the flange part of the camshaft on the axial end side of the rotor, for example, assembling Groove, which has a great influence on the arrangement of the two rows of hydraulic medium channels in the rotor. In this case, it is very difficult to reduce the axial size of the rotor and even the camshaft phase modulator.

Summary of the invention

Therefore, the technical problem to be solved by this application is to provide a camshaft phase modulator, which has a smaller axial size.

This technical problem is solved by a rotor for a camshaft phase modulator. The rotor can form a first pressure chamber and a second pressure chamber spaced from each other in the circumferential direction with the stator of the camshaft phase modulator on the radially outer side. The rotor has an axial through hole for accommodating the central valve, wherein the rotor and the central valve can form a first annular cavity and a second annular cavity spaced from each other in the axial direction on the inner side of the rotor in the radial direction. The rotor has a first passage for communicating between the first pressure chamber and the first annular cavity, and a second passage for communicating between the second pressure chamber and the second annular cavity.

Within the scope of the present application, unless otherwise stated, the terms "axial", "radial" and "circumferential" are all based on the axis of rotation of the rotor.

Within the scope of this application, it is stipulated for the convenience of description: the camshaft phase modulator shall be expressed by the prefix "first" towards the axial side of the camshaft after assembly; the axial side facing away from the camshaft shall be expressed by the prefix " The second" expression. For example, it is specified that the annular cavity near the camshaft after assembly is the first annular cavity, and the annular cavity far away from the camshaft is the second annular cavity. In addition, it should be noted that in the scope of the present application, the axial positional relationship of the pressure chamber is not involved, and the first pressure chamber and the second pressure chamber are named only according to the communication relationship with the first channel and the second channel.

Within the scope of the present application, the rotor includes a base body having an axial through hole and a plurality of blades extending radially outward from the base body. The rotor forms a first pressure chamber and a second pressure chamber spaced apart from each other in the circumferential direction by virtue of its blades and the stator. The base body and the blade can be integrally formed. Alternatively, the base body and the blade may be formed separately, and then connected to each other by means of plug-in connection or the like.

Within the scope of the present application, the interval between the first annular cavity and the second annular cavity can be achieved by the structure of the rotor, and/or the structure of the central valve, and/or the rotor and the third member outside the central valve.

Within the scope of the present application, the first channel and the second channel are used to circulate the hydraulic medium, especially hydraulic oil, in the camshaft phase modulator. The first channel and the second channel are respectively distributed in the circumferential direction. The number of the first passage and the second passage corresponds to the number of vanes or the number of the first pressure chamber and the second pressure chamber.

According to the present application, at least one of the first passage and the second passage includes: a radial section and an axial section, wherein the radial section leads from the corresponding pressure chamber to the radial inner side of the rotor in a radial plane , And the radial plane is closer to the axial center of the rotor in the axial direction than the corresponding annular cavity, wherein the axial section communicates with the radial section and the corresponding annular cavity in the axial direction.

Therefore, the rotor according to the present application involves three design solutions, namely, only the first channel has a radial section and an axial section; only the second channel has a radial section and an axial section; and the first channel and The second passage has a radial section and an axial section, respectively.

In the first design solution, only the first passage has a radial section and an axial section, that is, the first radial section and the first axial section. Here, the first radial section leads from the first pressure chamber to the radial inner side of the rotor in a first radial plane. The first radial section here is not limited to extending in the radial direction, it can also extend in the circumferential direction locally. The first radial plane is closer to the axial center of the rotor in the axial direction than the first annular cavity, so the opening on the radial inner side of the first radial section and the first annular cavity are not identical or only partially in the axial direction. The ground is heavy. The first axial section axially communicates with the opening on the radial inner side of the first radial section and the first annular cavity. In this way, a smaller axial size of the rotor can be realized, and at the same time, the flow capacity of the hydraulic medium between the first channel and the first annular cavity, especially the flow capacity that meets the relevant technical requirements, is ensured. In this case, it is also possible to provide a fitting groove for the camshaft, especially the flange of the camshaft, on the first axial side of the rotor.

In the second design solution, only the second passage has a radial section and an axial section, that is, a second radial section and a second axial section. Here, the second radial section leads from the second pressure chamber to the radial inner side of the rotor in a second radial plane. The second radial section is not limited to extending in the radial direction here, but it may also extend in the circumferential direction locally. The second radial plane is closer to the axial center of the rotor in the axial direction than the second annular cavity, so the opening on the radial inner side of the second radial section and the second annular cavity are not identical or only partially in the axial direction. The ground is heavy. The second axial section axially communicates with the opening on the radial inner side of the second radial section and the second annular cavity. In this way, a smaller axial size of the rotor can be realized, and at the same time, the circulation capacity of the hydraulic medium between the second channel and the second annular cavity, especially the circulation capacity that meets the relevant technical requirements, is ensured. In this case, it is also possible to provide a fitting groove for, for example, the flange portion of the central valve on the second axial side of the rotor.

In the third design solution, the first passage has a first radial section and a first axial section, and the second passage has a second radial section and a second axial section. For the specific configuration, please refer to the explanations in the first and second basic implementations. In the case that the first axial section and the second axial section can be arranged staggered in the circumferential direction, the first radial plane and the second radial plane can be arranged close to each other, and can even be arranged overlappingly, so that it can be further Reduce the axial size of the rotor.

On the basis of the above design solution, this application also provides a variety of preferred embodiments.

In a preferred embodiment, both the radial section and the axial section are formed on the base body of the rotor. Therefore, in a design solution in which both the first passage and the second passage have a radial section and an axial section, the hydraulic medium passage can be constructed only on the base body. Especially for the embodiment in which the blade and the base body are formed separately, it is beneficial to simplify the manufacture of the hydraulic medium channel.

Here, advantageously, the radial section extends in the radial direction, and the radially outer opening of the radial section is formed on the outer peripheral surface of the base body. In this way, a simple channel structure of the radial section is realized, which is convenient to manufacture and saves costs.

In another preferred embodiment, the axial section opens into the corresponding annular cavity in the radial direction. On the one hand, this corresponds to the overall flow tendency of the hydraulic medium to the radially outer side, which helps to reduce the channel resistance. On the other hand, due to the vertical arrangement of the extending direction of the axial section and the plane where the annular cavity is located, the axial section can achieve an ideal hydraulic medium channel cross-sectional area with a smaller cross-sectional area, thereby reducing The impact on other structures due to the axial section.

Here, advantageously, the axial section penetrates the axial end surface of the rotor on the side of the corresponding annular cavity in the axial direction. Here, the annular cavity can be closed by the cover plate or the flange of the camshaft or the flange of the central valve. The open design of the axial end side of the rotor helps simplify the manufacture and processing of the axial section and save costs.

Here, advantageously, a fitting groove is formed on the axial end surface, wherein the axial section penetrates the groove bottom of the fitting groove in the axial direction. For example, a fitting groove for accommodating the flange portion of the camshaft may be provided on the first axial side of the rotor, especially the base body. Additionally or alternatively, a mounting groove for accommodating the central valve can be provided on the second axial side of the rotor, in particular the base body. Similarly, the open design of the axial end side of the rotor helps simplify the manufacture and processing of the axial section and save costs.

Here, advantageously, the axial section has an arc-shaped radial cross section. As a result, the radial size of the axial section can be reduced as much as possible while ensuring the cross-sectional area of the hydraulic medium channel to avoid affecting other structures of the rotor.

In another preferred embodiment, the rotor is configured with an annular protrusion protruding in the radial direction on the radial inner side, for separating the first annular cavity and the second annular cavity in the axial direction.

The aforementioned technical problem can also be solved by a camshaft phase modulator including the above-mentioned rotor.

Through the rotor for the camshaft phase modulator and the camshaft phase modulator itself according to the present application, the axial size of the rotor can be realized in a small size, while ensuring the flow of the hydraulic medium between the hydraulic medium channel and the corresponding annular cavity Ability, especially the circulation capacity that meets the relevant technical requirements. In this case, an assembly part for camshafts and other components may also be provided on the axial side of the rotor.

Description of the drawings

Hereinafter, the preferred embodiments of the present application will be illustrated schematically with reference to the accompanying drawings. The attached picture is:

Fig. 1 is a perspective view of a rotor for a camshaft phase modulator according to a preferred embodiment,

Fig. 2 is a radial cross-sectional view of the rotor according to Fig. 1.

Detailed ways

Fig. 1 shows a perspective view of a rotor for a camshaft phase modulator according to a preferred embodiment. The rotor includes a base 11 and a plurality of blades 12 extending radially outward from the base 11. Here, the base 11 and the blade 12 are integrally formed.

A fitting groove 15 for fitting the camshaft is formed on the first axial side of the rotor. The fitting groove 15 is formed on the base 11.

The rotor can form a first pressure chamber and a second pressure chamber spaced apart from each other in the circumferential direction with components such as the stator and cover plate of the camshaft phase modulator on the radially outer side of the blade 12 of the rotor. The blade 12 is provided with a seal groove 18 on the radially outer side of each blade 12 for accommodating a seal for sealing the first pressure chamber and the second pressure chamber.

The rotor includes an axial through hole 16 for accommodating a central valve. The rotor can form a first annular cavity with the central valve and the flange portion of the camshaft on the radial inner side, and the rotor can form a second annular cavity with the central valve on the radial inner side. The first annular cavity and the second annular cavity are spaced apart from each other in the axial direction, wherein the first annular cavity is located on the first axial side, and the second annular cavity is located on the second axial side opposite to the first axial side. In this embodiment, the first annular cavity and the second annular cavity are separated by an annular protrusion 17 configured on the inner wall of the axial through hole 16.

A first channel 13 and a second channel 14 are respectively constructed on both sides of the blade 4 in the circumferential direction. Here, the first passage 13 and the second passage 14 are arranged spaced apart in the axial direction, and the first passage 13 is closer to the axial side for mounting the camshaft than the second passage, that is, the first axial side. The first passage 13 is used to communicate the first pressure chamber and the first annular cavity. The second passage 14 is used to communicate the second pressure chamber and the second annular cavity.

Fig. 2 shows a radial sectional view of the rotor according to Fig. 1.

As can be seen in conjunction with FIG. 1 and FIG. 2, the first passage 13 includes a radial section 13 a and an axial section 13 b in this embodiment. The radial section 13a extends radially inwardly from the radially outer surface of the base body 11. As shown in Fig. 2, the radially inner opening of the radial section 13a and the first annular cavity deviate from each other. The axial section 13b configured in the form of a circular arc-shaped blind hole can communicate with the opening on the radial inner side of the radial section 13a and the first annular cavity in the axial direction with an ideal hydraulic medium channel cross-sectional area. Here, the radially inner side wall of the blind hole is open toward the first annular cavity, that is to say the axial section 13b opens into the first annular cavity in the radial direction. The axial section 13b penetrates the groove bottom of the assembling groove 15 in the axial direction. The second passage 14 penetrates the outer peripheral surface and the inner peripheral surface of the base 11 in the radial direction in this embodiment. As a result, it is possible to reduce the axial size of the rotor or camshaft phase modulator while constructing the assembling groove 15 and ensuring the sealing requirement between the two annular cavities, that is, ensuring the axial size of the annular protrusion 17 size.

Although possible embodiments are exemplarily described in the above description, it should be understood that there are still a large number of embodiment variations through all known and otherwise easily conceivable technical features and implementation combinations. In addition, it should be understood that the exemplary embodiment is only taken as an example, and this embodiment does not limit the protection scope, application, and structure of the present application in any form. Through the foregoing description, it is more to provide technical guidance for the technical personnel to transform at least one exemplary embodiment, in which various changes can be made as long as they do not deviate from the scope of protection of the claims, especially regarding the Changes in the function and structure of components.

List of reference signs

11 Matrix

12 Blade

13 The first channel

13a Radial section

13b Axial section

14 Second channel

15 Assembly groove

16 Axial through hole

17 Annular protrusion

18 Seal groove

Claims

Rotor for camshaft phase modulator,

Wherein, the rotor can form a first pressure chamber and a second pressure chamber spaced from each other in the circumferential direction with the stator of the camshaft phase modulator on the radially outer side,

Wherein, the rotor has an axial through hole (16) for accommodating a central valve, wherein the rotor and the central valve can form a first annular cavity and a second annular cavity spaced from each other in the axial direction on the inner side in the radial direction. Annular cavity,

Wherein, the rotor has a first passage (13) for communicating the first pressure chamber and the first annular cavity and a second passage for communicating the second pressure chamber and the second annular cavity (14),

It is characterized by

At least one of the first channel (13) and the second channel (14) has:

-A radial section (13a), which leads from the corresponding pressure chamber to the radial inner side of the rotor in a radial plane, wherein the radial plane is closer to the rotor in the axial direction than the corresponding annular cavity Axial center; and

-Axial section (13b) which communicates said radial section (13a) and said corresponding annular cavity in the axial direction.
The rotor according to claim 1, characterized in that the rotor comprises: a base body (11) having the axial through hole (16) and a plurality of radially outwardly extending from the base body (11) The blade (12), wherein the radial section (13a) and the axial section (13b) are both constructed on the base body (11).
The rotor according to claim 2, characterized in that the radial section (13a) extends in the radial direction, and the radially outer opening of the radial section (13a) is configured in the base body (11 ) On the outer peripheral surface.
The rotor according to claim 1, characterized in that the axial section (13b) opens into the corresponding annular cavity in the radial direction.
The rotor according to claim 4, wherein the axial section (13b) penetrates the axial end surface of the rotor on the side of the corresponding annular cavity in the axial direction.
The rotor according to claim 5, characterized in that a fitting groove (15) is configured on the axial end surface, wherein the axial section (13b) penetrates the fitting groove (15) in the axial direction. ) At the bottom of the groove.
The rotor according to claim 4, characterized in that the axial section (13b) has an arc-shaped radial cross section.
The rotor according to claim 1, wherein the rotor is configured with a radially convex annular protrusion (17) on the radial inner side for separating the first annular cavity and the second annular cavity. Annular cavity.
The camshaft phase modulator is characterized in that the camshaft phase modulator comprises the rotor according to any one of claims 1-8.