Drive transmission device

Abstract

To provide a dive transmission device capable of giving multiple functions to a constituent member to improve efficiency of a device configuration.SOLUTION: A drive transmission device 10 has a configuration in which an annular magnetic pole member 40 is fixed, where driving force is transmitted to a driven-side rotary member 30 by rotating a magnetic rolling elements 32 magnetically coupled to a driving-side rotary member 20 as the driving-side rotary member 20 rotates. The magnetic rolling element 32 is rotatably provided on the driven-side rotary member 30, and, for example, rolls in contact with a peripheral wall part 50b of a partition member 50 provided on an outer peripheral side of the drive-side rotary member 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a non-contact drive transmission device. [Background technology]

[0002] A non-contact drive transmission device is configured by magnetically coupling a driving rotation member and a driven rotation member, and transmits a rotational drive force from a drive source to a load via the driving rotation member and the driven rotation member.

[0003] For example, the drive transmission device disclosed in Patent Document 1 is configured by arranging a driving side rotating member and a driven side rotating member inside a surrounding magnetic pole member that is fixed. The surrounding magnetic pole member and the driving side rotating member each have a plurality of magnetic pole parts made of permanent magnets arranged side by side in the circumferential direction. The driven side rotating member has a plurality of magnetic members arranged side by side in the circumferential direction. The magnetic members of the driven side rotating member are inserted between the surrounding magnetic pole members and the magnetic pole parts of the driving side rotating member, and the magnetic pole parts and the magnetic members are arranged side by side in the radial direction. In the drive transmission device of Patent Document 1, a driving force is transmitted from the driving side rotating member to the driven side rotating member through the magnetic members. Incidentally, there is also a drive transmission device in which a plurality of magnetic members are arranged stationary and the surrounding magnetic pole members are provided as part of the driven side rotating member, and a driving force is transmitted from the driving side rotating member to the driven side rotating member through the surrounding magnetic pole members.

[0004] In addition, as in the drive transmission device disclosed in Patent Document 1, by making the number of surrounding magnetic pole members and each magnetic pole portion of the driving side rotating member and the number of magnetic members of the driven side rotating member different by a predetermined number, it is possible to slow down or speed up the rotation transmitted from the driving side rotating member to the driven side rotating member. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-142407 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the above non-contact drive transmission device, the present inventor has considered improving the efficiency of the device configuration by giving multiple functions to the components. If the device configuration can be made more efficient, it will lead to the omission of components and ultimately to the simplification of the device configuration. An object of the present invention is to provide a drive transmission device that can improve the efficiency of the device configuration by giving multiple functions to the components. [Means for solving the problem]

[0007] The drive transmission device that solves the above problem includes a first magnetic pole member (20, 25, 26) having a plurality of magnetic pole portions (22a, 25a, 26a) arranged side by side in the circumferential direction, a second magnetic pole member (40, 42, 44, 45) having a plurality of magnetic pole portions (40a, 42a, 44a, 45a, 45b) arranged side by side in the circumferential direction, and a magnetic member (32, 34) that is located on a magnetic path between the magnetic pole portions of the first magnetic pole member and the magnetic pole portions of the second magnetic pole member and that is arranged side by side in the circumferential direction. The second magnetic pole member is fixed, and the magnetic member magnetically connected to the first magnetic pole member rotates in accordance with the rotation of the first magnetic pole member, thereby transmitting a driving force; alternatively, the magnetic member is fixed, and the second magnetic pole member magnetically connected to the first magnetic pole member rotates in accordance with the rotation of the first magnetic pole member, thereby transmitting a driving force, and the magnetic member is composed of a magnetic rolling body (32, 34) that is arranged to be capable of rolling.

[0008] According to the above aspect, when the second magnetic pole member is stationary, the magnetic member magnetically coupled to the first magnetic pole member rotates with the rotation of the first magnetic pole member to transmit the driving force. Alternatively, when the rotation of the magnetic member is stationary, the second magnetic pole member magnetically coupled to the first magnetic pole member rotates with the rotation of the first magnetic pole member to transmit the driving force. Since the magnetic member is provided as a magnetic rolling body that can roll by itself, it is also possible to make the magnetic member function as a bearing by rolling it in contact with, for example, the first magnetic pole member, the second magnetic pole member, other surrounding members, etc. In this way, the bearing member can be omitted. Also, if the magnetic rolling body can be contacted with the first magnetic pole member, the second magnetic pole member, other surrounding members, etc., it is expected that the transmission efficiency of the driving force from the first magnetic pole member can be improved. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a plan view showing a drive transmission device according to an embodiment. [Diagram 2] FIG. 2 is a vertical cross-sectional view showing the drive transmission device according to the embodiment. [Diagram 3] FIG. 11 is a table showing a comparison of transmission efficiency between the embodiment and a comparative example. [Figure 4] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Diagram 5] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 6] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 7] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 8] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 9] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 10] 10A and 10B are diagrams showing a drive transmission device according to a modified example, in which FIG. [Figure 11] 10A and 10B are diagrams showing a drive transmission device according to a modified example, in which FIG. [Figure 12]10A and 10B are diagrams showing a drive transmission device according to a modified example, in which FIG. [Figure 13] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 14] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 15] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 16] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 17] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 18] FIG. 11 is a plan view showing a drive transmission device according to a modified example. [Figure 19] 10A and 10B are diagrams showing a drive transmission device according to a modified example, in which FIG. [Figure 20] 10A and 10B are diagrams showing a drive transmission device according to a modified example, in which FIG. [Figure 21] 10A and 10B are diagrams showing magnetic rolling elements of a drive transmission device in a modified example, where (a) is an overall plan view, and (b) and (c) are partially enlarged views. [Figure 22] 10A to 10D are diagrams showing a magnetic rolling element of a drive transmission device in a modified example, where (a) is an overall plan view, (b) is a schematic side view, and (c) and (d) are partially enlarged views. [Diagram 23] 10A and 10B are diagrams showing magnetic rolling elements of a drive transmission device in a modified example, where FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of the drive transmission device will be described below. 1 and 2 is used in, for example, a refrigeration cycle device 11 of a vehicle air conditioner. The drive transmission device 10 transmits the rotational drive force of an electric motor M, which is a drive source, to a valve device 12 on a load side in order to open and close the valve device 12 that adjusts the flow rate of a refrigerant in a refrigerant circulation passage of the refrigeration cycle device 11.

[0011] The drive transmission device 10 includes a driving side rotating member 20, a driven side rotating member 30, and an annular magnetic pole member 40. The driving side rotating member 20 corresponds to a first magnetic pole member, and the annular magnetic pole member 40 corresponds to a second magnetic pole member.

[0012] The driving side rotating member 20 is configured as a separate body from the electric motor M, and rotates based on the driving of the output shaft of the electric motor M. Alternatively, the driving side rotating member 20 is configured as a part of the rotor of the electric motor M, and rotates based on the driving of the stator of the electric motor M. In either case, the driving side rotating member 20 rotates based on the driving of the electric motor M.

[0013] The driving side rotating member 20 includes a base portion 21 and an annular magnet body 22. The base portion 21 has a shaft portion 21a and a support portion 21b. The shaft portion 21a is rotatably supported by a bearing 23 relative to a surrounding stationary member 23x. The shaft portion 21a is provided so that its central axis coincides with a reference axis L1 that serves as a reference for the drive transmission device 10. A support portion 21b is integrally provided at one axial end of the shaft portion 21a and extends radially outward from the shaft portion 21a. The annular magnet body 22 is fixed to the outer circumferential edge portion of the support portion 21b.

[0014] The annular magnet body 22 is made of a permanent magnet and has a circular ring shape having a predetermined length in the axial direction. The annular magnet body 22 is disposed so that its central axis coincides with the reference axis L1 of the drive transmission device 10. The annular magnet body 22 has four magnetic pole portions 22a in this embodiment at equal intervals in the circumferential direction. The magnetic pole portions 22a have N poles and S poles that appear on the outer circumferential surface of the magnetic pole portions 22a alternately arranged in the circumferential direction within a 90° range.

[0015] Here, the drive transmission device 10 of this embodiment is provided for driving a valve device 12 that adjusts the flow rate of the refrigerant. The driven side rotating member 30 and the annular magnetic pole member 40 arranged on the valve device 12 side are arranged in a water-exposed area A1 as a first area into which the refrigerant enters. In contrast, the drive side rotating member 20 arranged on the electric motor M side is arranged in a waterproof area A2 as a second area into which the refrigerant is prohibited from entering. Therefore, the drive transmission device 10 of this embodiment is provided with a partition member 50 for separating the water-exposed area A1 from the waterproof area A2.

[0016] The partition member 50 is made of a non-magnetic metal plate material. The partition member 50 is fixed to a surrounding stationary member 50x. The partition member 50 has a concave portion including a peripheral wall portion 50b extending cylindrically from a circular opening 50a and a bottom wall portion 50c closing the bottom of the peripheral wall portion 50b. The peripheral wall portion 50b is provided so that its central axis coincides with the reference axis L1 of the drive transmission device 10. The drive side rotating member 20 inserted from the opening 50a is accommodated inside the peripheral wall portion 50b. The peripheral wall portion 50b faces the magnet pole portion 22a of the drive side rotating member 20 in the radial direction. A small gap S1 for favorably transmitting the drive in the drive transmission device 10 is set between the inner peripheral surface of the peripheral wall portion 50b and the outer peripheral surface of the magnet pole portion 22a of the drive side rotating member 20.

[0017] The annular magnetic pole member 40 is formed of a permanent magnet in a circular ring shape having a predetermined length in the axial direction. The annular magnetic pole member 40 is fixed to the surrounding immovable member 40x. The annular magnetic pole member 40 is provided so that its central axis coincides with the reference axis L1 of the drive transmission device 10. The annular magnetic pole member 40 has 36 magnet magnetic pole portions 40a at equal intervals in the circumferential direction in this embodiment. The magnet magnetic pole portions 40a have N poles and S poles that appear on their inner circumferential surfaces alternately arranged in a 10° range in the circumferential direction. The magnet magnetic pole portions 40a of the annular magnetic pole member 40 are provided at a radial interval from the peripheral wall portion 50b of the partition member 50. A magnetic rolling element 32 of the driven side rotating member 30, which will be described later, is inserted and accommodated between the magnet magnetic pole portions 40a of the annular magnetic pole member 40 and the peripheral wall portion 50b of the partition member 50.

[0018] The driven-side rotating member 30 includes a base portion 31 and a magnetic rolling element 32. The base portion 31 includes a shaft portion 31a and a support portion 31b. The shaft portion 31a is provided so that its central axis coincides with the reference axis L1 of the drive transmission device 10. A support portion 31b is integrally provided at one axial end of the shaft portion 31a and extends radially outward from the shaft portion 31a. In this embodiment, 20 magnetic rolling elements 32 are rotatably provided on the outer peripheral edge of the support portion 31b. The magnetic rolling elements 32 are arranged side by side at equal intervals in the circumferential direction, specifically at equal intervals of 18°, scattered in the circumferential direction with respect to the outer peripheral edge of the support portion 31b.

[0019] The magnetic rolling body 32 is made of a magnetic metal material and has a cylindrical shape. The magnetic rolling body 32 is provided so that its central axis is parallel to the reference axis L1 of the drive transmission device 10. The magnetic rolling body 32 is provided so as to abut against the outer peripheral surface, which is the abutment surface of the peripheral wall portion 50b of the partition member 50, and roll on the outer peripheral surface of the peripheral wall portion 50b. The magnetic rolling body 32 faces the magnetic pole portion 40a of the annular magnetic pole member 40 in the radial direction. Between the outermost peripheral portion of the magnetic rolling body 32 in the drive transmission device 10 and the inner peripheral surface of the magnetic pole portion 40a of the annular magnetic pole member 40, a minute gap S2 is set to suitably transmit the drive in the drive transmission device 10. In this way, the magnetic pole portion 22a of the driving side rotating member 20, the peripheral wall portion 50b of the partition member 50, the magnetic rolling body 32 of the driven side rotating member 30, and the magnetic pole portion 40a of the annular magnetic pole member 40 are arranged in line in the radial direction.

[0020] The operation (function) of the drive transmission device 10 of this embodiment will be described. In this embodiment, the number of the magnetic pole portions 22a of the driving side rotating member 20 is set to "4", the number of the magnetic rolling bodies 32 of the driven side rotating member 30 is set to "20", and the number of the magnetic pole portions 40a of the annular magnetic pole member 40 is set to "36". Then, due to the magnetic coupling between the magnetic pole portions 22a of the driving side rotating member 20 and the magnetic rolling bodies 32 of the driven side rotating member 30 and the magnetic action of the magnetic pole portions 40a of the annular magnetic pole member 40, when the driving side rotating member 20 rotates, the driven side rotating member 30 rotates in the opposite direction. In this case, the rotation speed is reduced when the drive is transmitted from the driving side rotating member 20 to the driven side rotating member 30 by setting the numbers of the magnetic pole portions 22a, 40a and the magnetic rolling bodies 32 as described above.

[0021] Furthermore, when transmitting drive from the driving-side rotating member 20 to the driven-side rotating member 30, the magnetic rolling elements 32 rotate while rolling on the outer circumferential surface of the peripheral wall portion 50b of the partition member 50. That is, the magnetic rolling elements 32 also function as bearings for the driven-side rotating member 30. The driven-side rotating member 30 is rotatably supported relative to the peripheral wall portion 50b of the partition member 50 by the magnetic rolling elements 32, which also function as bearings. Therefore, for the driven-side rotating member 30, it is possible to omit a bearing member that supports, for example, the shaft portion 31a, etc., as in this embodiment.

[0022] In addition, the magnetic rolling element 32 can be configured to abut against the outer peripheral surface of the peripheral wall portion 50b of the partition member 50, since it rolls on the outer peripheral surface of the peripheral wall portion 50b. In other words, there is no need to provide a gap between the magnetic rolling element 32 of the driven-side rotating member 30 and the partition member 50. Therefore, in the radial arrangement of the magnetic pole portion 22a of the driving-side rotating member 20, the peripheral wall portion 50b of the partition member 50, the magnetic rolling element 32 of the driven-side rotating member 30, and the magnetic pole portion 40a of the annular magnetic pole member 40, only two gaps S1 and S2 are required. In this manner, the configuration is such that the decrease in drive transmission efficiency caused by magnetic flux leakage in the gaps is minimized.

[0023] FIG. 3 shows the results of comparing the transmission torque of the present invention using the magnetic rolling element 32 with the transmission torque of Comparative Examples 1 to 5 using magnetic elements 32x1 to 32x5 of various shapes different from the magnetic rolling element 32.

[0024] The magnetic body 32x1 of Comparative Example 1 has a columnar shape with a sector-shaped cross section, in which a pair of circumferential side surfaces are surrounded by flat surfaces along the radial direction, and the inner and outer sides are surrounded by curved surfaces along the circumferential direction. The magnetic body 32x1 is set to be non-rolling. Therefore, in addition to the necessary gaps S1 and S2 as in the above embodiment, a new gap Sx is required between the magnetic body 32x1 and the peripheral wall portion 50b of the partition member 50. In the radial arrangement of the magnet pole portion 22a of the driving side rotating member 20, the peripheral wall portion 50b of the partition member 50, the magnetic body 32x1 of the driven side rotating member 30, and the magnet pole portion 40a of the annular magnetic pole member 40, there are three gaps S1, S2, and Sx. Note that the torque transmitted from the driving side rotating member 20 to the driven side rotating member 30 in Comparative Example 1 is used as a reference, and the transmission torque ratio is set to a reference value of "1". The transmission torque ratio of Comparative Example 1 is used for comparison with the other Comparative Examples 2 to 5 and the present invention described below.

[0025] The magnetic body 32x2 of Comparative Example 2 has a columnar shape with an arc-shaped cross section, with a pair of circumferential side surfaces surrounded by parallel flat surfaces and an inner side surface and an outer side surface each curved along the circumferential direction. The magnetic body 32x2 is also set to be non-rolling, and a gap Sx is required between the magnetic body 32x2 and the peripheral wall portion 50b of the partition member 50. The torque transmission ratio from the driving side rotating member 20 to the driven side rotating member 30 in Comparative Example 2 is "1.01", which is approximately the same as that of Comparative Example 1.

[0026] The magnetic body 32x3 of Comparative Example 3 has a columnar shape with a trapezoidal cross section, in which a pair of circumferential side surfaces are surrounded by a plane along the radial direction and an inner side surface and an outer side surface are surrounded by planes parallel to each other. The magnetic body 32x3 is also set to be non-rolling, and a gap Sx is required between the magnetic body 32x3 and the peripheral wall portion 50b of the partition member 50. The torque transmission ratio from the driving side rotating member 20 to the driven side rotating member 30 in Comparative Example 3 is "0.96", which is slightly smaller than that of Comparative Example 1.

[0027] The magnetic body 32x4 of Comparative Example 4 has a columnar shape with a rectangular cross section, in which a pair of circumferential side surfaces are surrounded by planes parallel to each other and planes whose inner and outer sides are parallel to each other. The magnetic body 32x4 is also set to be non-rolling, and a gap Sx is required between the magnetic body 32x4 and the peripheral wall portion 50b of the partition member 50. The torque transmission ratio from the driving side rotating member 20 to the driven side rotating member 30 in Comparative Example 4 is "0.97", which is approximately the same as Comparative Example 3 and slightly smaller than Comparative Example 1.

[0028] The magnetic body 32x5 of Comparative Example 5 has a cylindrical shape with a circular cross section like the magnetic rolling body 32, but is set to be non-rolling. Therefore, it is necessary to set the above-mentioned gap Sx between the magnetic body 32x5 and the peripheral wall portion 50b of the partition member 50. Moreover, the magnetic body 32x5 of Comparative Example 5 is formed to have a smaller diameter than the magnetic rolling body 32 by the amount of the gap Sx. Combined with this, the transmission torque ratio from the driving side rotating member 20 to the driven side rotating member 30 in Comparative Example 5 is the smallest at "0.69".

[0029] The transmission torque ratio of the present invention using the magnetic rolling elements 32 is the highest at "1.8" compared to the comparative examples 1 to 5. The magnetic rolling elements 32 are brought into contact with the outer circumferential surface of the peripheral wall portion 50b of the partition member 50 as a rolling mode, and the configuration in which the gap Sx occurring in the comparative examples 1 to 5 is eliminated is significant.

[0030] Incidentally, the magnetic bodies 32x1 to 32x3 of Comparative Example 1 to Comparative Example 3 have shapes that are relatively difficult to manufacture, such as a sector-shaped, arc-shaped, and trapezoidal columnar cross section. The magnetic bodies 32x4 and 32x5 of Comparative Example 4 and Comparative Example 5 have shapes that are relatively easy to manufacture, such as a rectangular and circular columnar cross section. The magnetic rolling body 32 of this embodiment also has a cylindrical shape, which is a relatively easy shape to manufacture, and the magnetic rolling body 32 of this embodiment is advantageous from the viewpoint of parts manufacturing as well.

[0031] In the drive transmission device 10 of the present embodiment thus configured, as shown in Fig. 2, when the driving side rotating member 20 rotates based on the driving of the electric motor M, the driving force is efficiently transmitted to the driven side rotating member 30 in a non-contact manner by magnetic coupling. In addition, the rotation is decelerated during the process of the drive transmission from the driving side rotating member 20 to the driven side rotating member 30. The rotational drive force of the driven side rotating member 30 drives the valve device 12 of the refrigeration cycle apparatus 11 to open and close through the shaft portion 31a, appropriately adjusting the flow rate of the refrigerant in the refrigerant circulation flow path each time. The drive transmission device 10 of the present embodiment is used on the drive transmission path between the electric motor M and the valve device 12 in the refrigeration cycle apparatus 11.

[0032] The effects of this embodiment will be described. (1) The drive transmission device 10 of this embodiment has a configuration in which the annular magnetic pole member 40 is stationary, and the magnetic rolling elements 32, which are magnetically coupled to the driving side rotating member 20, rotate in association with the rotation of the driving side rotating member 20, thereby transmitting the driving force to the driven side rotating member 30. The magnetic rolling elements 32 are provided rollably on the driven side rotating member 30, and when the magnetic rolling elements 32 are caused to roll in contact with the peripheral wall portion 50b of the partition member 50 provided on the outer periphery of the driving side rotating member 20 as in this embodiment, they also function as bearings for the driven side rotating member 30. In this way, the bearing members for the driven side rotating member 30 can be omitted.

[0033] (2) In the configuration of this embodiment in which the magnetic rolling body 32 abuts against the peripheral wall portion 50b of the partition member 50, the gap between the magnetic rolling body 32 and the partition member 50 can be eliminated, thereby improving the efficiency of transmission of the driving force from the driving side rotating member 20 to the driven side rotating member 30.

[0034] (3) Since the magnetic rolling elements 32 are cylindrical, magnetic transmission in the axial direction of the magnetic rolling elements 32 is excellent. This contributes to improving the efficiency of transmission of the driving force from the driving-side rotating member 20 to the driven-side rotating member 30.

[0035] (4) The drive transmission device 10 transmits the driving force of the electric motor M to a valve device 12 that adjusts the flow rate of the refrigerant in a refrigerant circulation flow path of the refrigeration cycle device 11. The partition member 50 is provided in the drive transmission device 10 to separate a water-exposed area A1 into which the refrigerant enters and a waterproof area A2 into which the refrigerant is prohibited from entering. The magnetic rolling elements 32 of the driven-side rotating member 30 roll in contact with the outer circumferential surface of the peripheral wall portion 50b of the partition member 50, thereby improving the efficiency of the device configuration.

[0036] This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction. The configuration of the drive transmission device 10 may be modified as appropriate. For example, it may be modified as shown in each of the embodiments in Figs.

[0037] The drive transmission device 10 shown in FIG. 4 is configured such that the peripheral wall portion 50b of the partition member 50 is located between the magnetic rolling body 32 of the driven-side rotating member 30 and the magnetic pole portion 40a of the annular magnetic pole member 40. The annular magnetic pole member 40 is located in the water-exposed area A1, and the driving-side rotating member 20 and the driven-side rotating member 30 are located in the waterproof area A2. The magnetic rolling body 32 abuts against the inner peripheral surface of the peripheral wall portion 50b of the partition member 50, and rolls on the inner peripheral surface of the peripheral wall portion 50b so as to function as a bearing for the driven-side rotating member 30. As a radial gap of the drive transmission device 10, the gap between the magnetic rolling body 32 of the driven-side rotating member 30 and the partition member 50 can be omitted, and the efficiency of transmission of the driving force from the driving-side rotating member 20 to the driven-side rotating member 30 is good. In addition, since the partition member 50 and the annular magnetic pole member 40 are both stationary and do not move relative to each other, it is also possible to omit the gap between the partition member 50 and the annular magnetic pole member 40. The drive transmission device 10 may be configured in this manner.

[0038] The drive transmission device 10 shown in FIG. 5 is used in a device that does not need to be partitioned into a water-stained area A1 and a waterproof area A2, and is configured without the partition member 50. The magnetic rolling body 32 abuts against the inner peripheral surface of the magnet magnetic pole part 40a of the annular magnetic pole member 40, and rolls on the inner peripheral surface of the annular magnetic pole member 40 to function as a bearing for the driven-side rotating member 30. As for the radial gap of the drive transmission device 10, in addition to the gap due to the elimination of the partition member 50, the gap between the magnetic rolling body 32 of the driven-side rotating member 30 and the annular magnetic pole member 40 can be eliminated, and the efficiency of transmission of the driving force from the driving-side rotating member 20 to the driven-side rotating member 30 is improved. The drive transmission device 10 may be configured in this manner.

[0039] The drive transmission device 10 shown in Fig. 6 is also configured without the partition member 50. The magnetic rolling elements 32 abut against the outer peripheral surface of the magnetic pole portion 22a of the driving-side rotating member 20, and roll on the outer peripheral surface of the driving-side rotating member 20 so as to function as a bearing for the driven-side rotating member 30. As for the radial gap of the drive transmission device 10, the gap created by removing the partition member 50 and the gap between the driving-side rotating member 20 and the magnetic rolling elements 32 of the driven-side rotating member 30 can be omitted, and the efficiency of transmission of the driving force from the driving-side rotating member 20 to the driven-side rotating member 30 is improved. The drive transmission device 10 may be configured in this manner.

[0040] As shown in FIG. 7, the magnetic rolling body 32 can be rolled on the outer circumferential surface of the magnetic pole portion 22a of the driving side rotating member 20 and the inner circumferential surface of the magnetic pole portion 40a of the annular magnetic pole member 40. In other words, the magnetic rolling body 32 can be set to abut on the outer circumferential surface of the magnetic pole portion 22a of the driving side rotating member 20 and the inner circumferential surface of the magnetic pole portion 40a of the annular magnetic pole member 40, respectively, so that no radial gap is generated in the drive transmission device 10. In this case, it is more important to set the dimensions of the magnetic rolling body 32, the driving side rotating member 20, and the annular magnetic pole member 40 relative to each other. In this way, the efficiency of transmission of the driving force from the driving side rotating member 20 to the driven side rotating member 30 is further improved. The drive transmission device 10 may be configured in this way.

[0041] The drive transmission device 10 shown in FIG. 8 is substantially the same as that shown in FIG. 6, and a coating 24 is provided on the outer peripheral surface of the magnetic pole portion 22a of the driving side rotating member 20 against which the magnetic rolling body 32 abuts and rolls. The coating 24 is, for example, a metal plating film, a resin film such as Teflon (registered trademark), a diamond-like carbon (DLC) film, or the like. The coating 24 may function as a protective film that protects the outer peripheral surface of the magnetic pole portion 22a of the driving side rotating member 20 against which the magnetic rolling body 32 abuts and rolls from wear with the magnetic rolling body 32. The coating 24 may also function to increase the sliding property of the magnetic rolling body 32 against the outer peripheral surface of the magnetic pole portion 22a of the driving side rotating member 20. The drive transmission device 10 may be configured in this manner.

[0042] The drive transmission device 10 shown in FIG. 9 is substantially the same as that shown in FIG. 5, and has a coating 41 provided on the inner circumferential surface of the magnetic pole portion 40a of the annular magnetic pole member 40 against which the magnetic rolling element 32 rolls in contact. The coating 41 is made of the same material as the coating 24 and functions in the same manner. The coating 41 may function as a protective film that protects the inner circumferential surface of the magnetic pole portion 40a of the annular magnetic pole member 40 against which the magnetic rolling element 32 rolls in contact from wear with the magnetic rolling element 32. The coating 41 may also function to increase the sliding property of the magnetic rolling element 32 against the inner circumferential surface of the magnetic pole portion 40a of the annular magnetic pole member 40. The drive transmission device 10 may be configured in this manner.

[0043] The drive transmission device 10 shown in Figures 10(a) and 10(b) is an axially opposed type (hereinafter referred to as axial type) instead of the radially opposed type (hereinafter referred to as radial type) of the embodiment shown in Figure 1, but otherwise has substantially the same configuration. Note that Figure 10(b) shows half a circumference, and the up-down direction of the figure will be used as an example for the explanation.

[0044] The driving side rotating member 25 is disk-shaped and includes a permanent magnet, and has four magnet poles 25a at equal intervals in the circumferential direction. The magnet poles 25a have N and S poles that alternate in the circumferential direction on the upper surface of the driving side rotating member 25. A partition member 51 made of a non-magnetic metal plate is disposed on the upper surface of the driving side rotating member 25 with a gap S3 in between. The magnetic rolling members 34 that constitute a part of the driven side rotating member 33 are disposed on the upper surface of the partition member 51. The magnetic rolling members 34 are cylindrical and made of a magnetic metal material, and 20 of them are rotatably disposed at equal intervals in the circumferential direction. The magnetic rolling members 34 are disposed so that their central axes are aligned with the radial direction of the drive transmission device 10. The disk magnetic pole member 42 is disposed above the magnetic rolling members 34 with a gap S4 in between. The disk magnetic pole member 42 is disk-shaped and includes a permanent magnet, and has 36 magnet poles 42a at equal intervals in the circumferential direction. The magnetic pole portion 42a has N and S poles that alternate in the circumferential direction on its lower surface. The disk magnetic pole member 42 and the partition member 51 are fixed, and the magnetic rolling element 34 rolls and rotates in contact with the upper surface of the partition member 51.

[0045] When the driving side rotating member 25 rotates, the magnetic rolling body 34 rolls on the upper surface of the partition member 51. At this time, the magnetic rolling body 34 magnetically coupled to the driving side rotating member 25, that is, the driven side rotating member 33, is transmitted with reduced rotation by setting the number of the magnetic pole parts 25a of the driving side rotating member 25, the magnetic rolling body 34, and the magnetic pole parts 42a of the disk magnetic pole member 42. As for the axial gap in the axial type drive transmission device 10, the gap between the magnetic rolling body 34 of the driven side rotating member 33 and the partition member 51 can be omitted, and the transmission efficiency of the driving force from the driving side rotating member 25 to the driven side rotating member 33 is good. In addition, when transmitting the drive from the driving side rotating member 25 to the driven side rotating member 33, the magnetic rolling body 34 also functions as a bearing, so that the bearing member of the driven side rotating member 33 can be omitted. The drive transmission device 10 may be configured in this manner.

[0046] The drive transmission device 10 shown in Figures 11(a) and 11(b) is configured by omitting the partition member 51 from the embodiment shown in Figure 10. The magnetic rolling element 34 abuts against the lower surface of the magnetic pole portion 42a of the disk magnetic pole member 42 so as to roll on the lower surface. As for the axial gap of the drive transmission device 10, in addition to the gap eliminated by eliminating the partition member 51, the gap between the magnetic rolling element 34 of the driven-side rotation member 33 and the disk magnetic pole member 42 can also be eliminated, and the efficiency of transmission of the driving force from the driving-side rotation member 25 to the driven-side rotation member 33 is improved. The drive transmission device 10 may be configured in this manner.

[0047] The drive transmission device 10 shown in Fig. 12(a) and Fig. 12(b) is substantially the same as that shown in Fig. 11, and a coating 43 is provided on the lower surface of the magnetic pole portion 42a of the disk magnetic pole member 42 against which the magnetic rolling element 34 abuts and rolls. The coating 43 is the same as the coating 24 described above. The coating 43 may function as a protective film that protects the lower surface of the magnetic pole portion 42a of the disk magnetic pole member 42 against which the magnetic rolling element 34 abuts and rolls from wear with the magnetic rolling element 34. The coating 43 may also function to increase the sliding property of the magnetic rolling element 34 against the lower surface of the magnetic pole portion 42a of the disk magnetic pole member 42. The drive transmission device 10 may be configured in this manner.

[0048] The drive transmission device 10 shown in Fig. 13 is configured by replacing the drive-side rotating member 20 having the magnetic pole portion 22a of the permanent magnet shown in Fig. 1 with a drive-side rotating member 26 having the magnetic pole portion 26a of an electromagnet. The magnetic pole portion 26a has a coil 26b and a core 26c. For example, six magnetic pole portions 26a are provided at equal intervals in the circumferential direction, and magnetic poles appear on the outer circumferential surface of the magnetic pole portion 26a. In addition, a partition member 50, a driven-side rotating member 30 having a magnetic rolling body 32, and an annular magnetic pole member 40 having a magnetic pole portion 40a are similarly used. The drive transmission device 10 may be configured in this manner.

[0049] The drive transmission device 10 shown in Fig. 14 is configured by replacing the annular magnetic pole member 40 having the magnetic pole portions 40a of the permanent magnet shown in Fig. 13 with an annular magnetic pole member 44 having the magnetic pole portions 44a of an electromagnet. The magnetic pole portions 44a have a coil 44b and a core 44c. For example, 12 magnetic pole portions 44a are provided at equal intervals in the circumferential direction, and magnetic poles appear on the inner circumferential surface of the magnetic pole portions 44a. The number of magnetic rolling bodies 32 of the driven-side rotating member 30 is, for example, 10. The drive transmission device 10 may be configured in this manner.

[0050] The drive transmission device 10 shown in Fig. 15 is configured by replacing the drive-side rotating member 20 having the magnetic pole portion 22a of the permanent magnet shown in Fig. 1 with an annular magnetic pole member 45 having a salient magnetic pole portion 45a protruding inward. The annular magnetic pole member 45 is made of a magnetic metal material and has a circular ring shape. For example, 18 salient magnetic pole portions 45a are provided at equal intervals in the circumferential direction. In addition, the drive-side rotating member 20 having the magnetic pole portion 22a, the partition member 50, and the driven-side rotating member 30 having the magnetic rolling elements 32 are used in the same manner. The drive transmission device 10 may be configured in this manner.

[0051] The drive transmission device 10 shown in Fig. 16 uses an annular magnetic pole member 45 having the salient pole magnetic pole portion 45a shown in Fig. 15. The annular magnetic pole member 45 is provided with magnetic pole portions 45b, each of which is formed by providing a permanent magnet with an N pole, in all recesses between the salient pole magnetic pole portions 45a adjacent to each other in the circumferential direction. In other words, the salient pole magnetic pole portion 45a functions as an S pole due to the adjacent N pole magnetic pole portion 45b. The number of magnetic poles of the annular magnetic pole member 45 is 36 in total, including the salient pole magnetic pole portions 45a and the magnetic pole portions 45b. The drive transmission device 10 may be configured in this manner.

[0052] The drive transmission device 10 shown in Fig. 17 uses the drive-side rotating member 26 having the magnetic pole parts 26a of the electromagnet shown in Fig. 13, and omits the partition member 50. The drive-side rotating member 26 is provided with a filler 27 in the recesses between adjacent magnetic pole parts 26a, and the outer circumferential surface of the drive-side rotating member 26 is configured to be a smooth circumferential surface without irregularities. The filler 27 is, for example, a resin material. Even in the case of the drive-side rotating member 26 having the magnetic pole parts 26a of the electromagnet on its outer periphery, it is possible to configure the magnetic rolling elements 32 to roll in contact with the outer circumferential surface. The drive transmission device 10 may be configured in this manner.

[0053] The drive transmission device 10 shown in FIG. 18 uses an annular magnetic pole member 45 having the salient pole magnetic pole portion 45a shown in FIG. 15, and omits the partition member 50. The annular magnetic pole member 45 is provided with a filler 46 in the recess between adjacent salient pole magnetic pole portions 45a, and the inner peripheral surface of the annular magnetic pole member 45 is configured to be a smooth circumferential surface without irregularities. The filler 46 is, for example, a resin material or a non-magnetic metal material. Even in the case of an annular magnetic pole member 45 having a salient pole magnetic pole portion 45a on its inner peripheral portion, it is possible to configure the magnetic rolling element 32 to roll in contact with its inner peripheral surface. The drive transmission device 10 may be configured in this manner.

[0054] The drive transmission device 10 shown in FIG. 19(a) and FIG. 19(b) is configured such that the driving side rotation member 20 and the magnetic rolling body 32 of the driven side rotation member 30 are opposed in an axial direction, and the magnetic rolling body 32 of the driven side rotation member 30 and the annular magnetic pole member 40 are opposed in a radial direction. That is, the drive transmission device 10 shown in FIG. 19 is a hybrid type in which an axial type and a radial type are mixed. In addition, this drive transmission device 10 uses a partition member 50. The magnetic rolling body 32 is provided with its central axis aligned along the axial direction of the drive transmission device 10. The magnetic rolling body 32 faces the magnetic pole portion 22a of the driving side rotation member 20 in the axial direction via the bottom wall portion 50c of the partition member 50. The magnetic pole portion 22a of the driving side rotation member 20 also has magnetic poles on its axial end surface. The magnetic rolling element 32 contacts the inner peripheral surface of the peripheral wall portion 50b of the partition member 50 and rolls on the inner peripheral surface of the peripheral wall portion 50b to function as a bearing for the driven-side rotating member 30. The annular magnetic pole member 40 is disposed on the outer peripheral side of the peripheral wall portion 50b of the partition member 50. The magnetic rolling element 32 faces the magnet magnetic pole portion 40a of the annular magnetic pole member 40 in the radial direction through the peripheral wall portion 50b of the partition member 50. As for the gaps on the magnetic path in the radial and axial directions in the hybrid drive transmission device 10, the gaps between the magnetic rolling element 32 of the driven-side rotating member 30 and the partition member 50 can be omitted, and the transmission efficiency of the driving force from the driving-side rotating member 20 to the driven-side rotating member 30 is good. The drive transmission device 10 may be configured in this manner.

[0055] The drive transmission device 10 shown in Fig. 20(a) and Fig. 20(b) is configured such that the driving side rotation member 20 and the magnetic rolling element 32 of the driven side rotation member 30 face each other in a radially opposed manner, and the magnetic rolling element 32 of the driven side rotation member 30 and the annular magnetic pole member 40 face each other in an axially opposed manner. The drive transmission device 10 shown in Fig. 20 is also a hybrid type in which a radial type and an axial type are mixed, as in Fig. 19. The magnetic rolling element 32 is oriented such that its central axis is along the axial direction of the drive transmission device 10, and faces the magnetic pole part 22a of the driving side rotation member 20 housed in the peripheral wall part 50b of the partition member 50 in the radial direction via the peripheral wall part 50b. The magnetic rolling element 32 abuts against the outer peripheral surface of the peripheral wall part 50b of the partition member 50, and rolls on the outer peripheral surface of the peripheral wall part 50b to function as a bearing for the driven side rotation member 30. Moreover, an annular magnetic pole member 40 is disposed on one axial side of the magnetic rolling body 32. The magnetic rolling body 32 faces the magnetic pole portion 40a of the annular magnetic pole member 40 in the axial direction. The magnetic pole portion 40a of the annular magnetic pole member 40 also has magnetic poles on its axial end face. As for the gaps on the magnetic path in the radial and axial directions in this drive transmission device 10, the gap between the magnetic rolling body 32 of the driven-side rotating member 30 and the partition member 50 can be omitted, and the efficiency of transmission of the driving force from the driving-side rotating member 20 to the driven-side rotating member 30 is good. The drive transmission device 10 may be configured in this manner.

[0056] In the radial type drive transmission device 10 of FIG. 1 etc., as shown in FIG. 21(a), a holding member 35 may be used to hold the intervals between the magnetic rolling elements 32 arranged at equal intervals in the circumferential direction in an axial orientation. The holding member 35 is made of a resin material or a non-magnetic metal material in an annular shape. The holding member 35 has holding grooves 35a for rotatably holding the magnetic rolling elements 32 at equal intervals in the circumferential direction. As shown in FIG. 21(b), a coating 36a may be provided on the inner circumferential surface of the holding groove 35a, which is the contact portion with the counterpart member. As shown in FIG. 21(c), a coating 36b may be provided on the outer circumferential surface of the magnetic rolling elements 32 themselves, which is the contact portion with the counterpart member. The coatings 36a, 36b are made of the same material as the coating 24 and function in the same way.

[0057] In addition, in the axial type drive transmission device 10 of FIG. 10 and the like, as shown in FIG. 22(a) and FIG. 22(b), a holding member 37 may be used to hold the magnetic rolling elements 34 arranged at equal intervals in the circumferential direction in a radial orientation. The holding member 37 is made of a resin material or a non-magnetic metal material in an annular shape as described above, and has holding grooves 37a for rotatably holding the magnetic rolling elements 34 at equal intervals in the circumferential direction. As shown in FIG. 22(c), the holding member 37 may also be provided with a coating 38a on the inner circumferential surface of the holding groove 37a, which is the contact portion with the mating member. As shown in FIG. 22(d), a coating 38b may also be provided on the outer circumferential surface of the magnetic rolling elements 34 themselves, which is the contact portion with the mating member. As described above, the coatings 38a and 38b are made of the same material as the coating 24 and function in the same way.

[0058] 23(a) and 23(b), holding members 35 for maintaining the spacing between the magnetic rolling elements 32 oriented along the axial direction may be provided at both axial ends of the magnetic rolling elements 32. In this case, bearings 39 may be provided at both ends of the magnetic rolling elements 32, and the magnetic rolling elements 32 may be supported by the holding members 35 via the bearings 39. In this way, the magnetic rolling elements 32 can rotate smoothly, and an improvement in the efficiency of transmission of the driving force from the driving-side rotating member 20 to the driven-side rotating member 30 can be expected.

[0059] The magnetic rolling elements 32, 34 have a cylindrical shape, which is a rollable outer shape, and are rotatably supported on the driven rotating member 30 so as to be rollable. However, the magnetic rolling elements 32, 34 may have a shape other than a cylindrical shape, and may have a rollable outer shape such as a spherical shape, a conical shape, a truncated conical shape, or the like.

[0060] The above-mentioned numbers of the magnetic pole portions 22a, 25a, 26a of the driving side rotating members 20, 25, 26, the magnetic rolling bodies 32, 34 of the driven side rotating members 30, 33, the magnetic pole portions 40a, 42a, 44a, 45b and the salient pole portions 45a of the magnetic pole members 40, 42, 44, 45 are merely examples. These numbers may be changed as appropriate. In this case, the drive transmission device 10 is configured to perform magnetic deceleration, but the number may be changed not only within the range in which deceleration is performed, but also to perform acceleration or constant speed transmission.

[0061] In the above, the magnetic rolling elements 32, 34 are rotatably provided in the driven-side rotating members 30, 33 and are configured to roll in contact with the driving-side rotating members 20, 25, 26, the annular magnetic pole members 40, 44, 45, the disk magnetic pole member 42, and the partition members 50, 51. The magnetic rolling elements 32, 34 do not have to be constantly in contact with the mating members.

[0062] The magnetic rolling elements 32, 34 themselves may be kept rollable but not rotated, and the magnetic pole members 40, 42, 44, 45 may be configured to be rotatable as part of the driven-side rotating members 30, 33. In this way, the magnetic pole members 40, 42, 44, 45 can be rotated based on the rotation of the driving-side rotating members 20, 25, 26. Even in this case, the magnetic rolling elements 32, 34 can be brought into contact with surrounding rotating members to eliminate the gap between the contacting parts, and the magnetic rolling elements 32, 34 can also function as bearings.

[0063] The drive transmission device 10 transmits the drive force of the electric motor M to the valve device 12 that adjusts the flow rate of the refrigerant in the refrigerant circulation passage of the refrigeration cycle device 11. The drive transmission device 10 may be applied to other devices. Depending on the device to which the drive transmission device 10 is applied, the partition members 50, 51 may be omitted as appropriate. In addition, the drive source may be something other than the electric motor M. [Explanation of symbols]

[0064] 11 refrigeration cycle device, 12 valve device, 20, 25, 26 drive side rotating member (first magnetic pole member), 22a, 25a, 26a magnet magnetic pole portion (magnetic pole portion), 24, 41, 43 coating, 27, 46 filler, 32, 34 magnetic rolling body (magnetic member), 35, 37 retaining member, 36a, 36b, 38a, 38b coating, 39 bearing, 40, 44, 45 annular magnetic pole member (second magnetic pole member), 42 disk magnetic pole member (second magnetic pole member), 40a, 42a, 44a, 45b magnet magnetic pole portion (magnetic pole portion), 45a salient pole magnetic pole portion (magnetic pole portion), 50, 51 partition member, A1 water-exposed area (first area), A2 waterproof area (second area)

Claims

1. a first magnetic pole member (20, 25, 26) having a plurality of magnetic pole portions (22a, 25a, 26a) arranged in parallel in a circumferential direction; a second magnetic pole member (40, 42, 44, 45) having a plurality of magnetic pole portions (40a, 42a, 44a, 45a, 45b) arranged in parallel in a circumferential direction; a magnetic member (32, 34) located on a magnetic path between the magnetic pole portion of the first magnetic pole member and the magnetic pole portion of the second magnetic pole member and arranged in parallel in a circumferential direction; Equipped with The second magnetic pole member is stationary, and the magnetic member magnetically coupled to the first magnetic pole member rotates in accordance with the rotation of the first magnetic pole member, thereby transmitting a driving force; or The rotation of the magnetic member is fixed, and the second magnetic pole member, which is magnetically coupled to the first magnetic pole member, rotates in accordance with the rotation of the first magnetic pole member, thereby transmitting a driving force. The magnetic member is composed of magnetic rolling elements (32, 34) that are rotatably provided, The magnetic rolling element is configured to be in contact with the first magnetic pole member or the second magnetic pole member and to be able to roll on the contact surface, A drive transmission device in which, when the first magnetic pole member or the second magnetic pole member is configured so that a recess is generated between the magnetic pole portions adjacent in the circumferential direction, a filler (27, 46) is provided in the recess, and the abutment surface of the first magnetic pole member or the second magnetic pole member with which the magnetic rolling body abuts is configured as a smooth circumferential surface without unevenness.

2. A first magnetic pole member (20, 25, 26) having a plurality of magnetic pole portions (22a, 25a, 26a) arranged in parallel in a circumferential direction; a second magnetic pole member (40, 42, 44, 45) having a plurality of magnetic pole portions (40a, 42a, 44a, 45a, 45b) arranged in parallel in a circumferential direction; a magnetic member (32, 34) located on a magnetic path between the magnetic pole portion of the first magnetic pole member and the magnetic pole portion of the second magnetic pole member and arranged in parallel in a circumferential direction; Equipped with The second magnetic pole member is stationary, and the magnetic member magnetically coupled to the first magnetic pole member rotates in accordance with the rotation of the first magnetic pole member, thereby transmitting a driving force; or The rotation of the magnetic member is fixed, and the second magnetic pole member, which is magnetically coupled to the first magnetic pole member, rotates in accordance with the rotation of the first magnetic pole member, thereby transmitting a driving force. The magnetic member is composed of magnetic rolling elements (32, 34) that are rotatably provided, The magnetic rolling elements are configured such that a plurality of the magnetic rolling elements arranged in parallel in the circumferential direction are held at intervals in the circumferential direction by holding members (35, 37), The drive transmission device, wherein the magnetic rolling elements are supported by the retaining member via bearings (39).

3. A first magnetic pole member (20, 25, 26) having a plurality of magnetic pole portions (22a, 25a, 26a) arranged in parallel in a circumferential direction; a second magnetic pole member (40, 42, 44, 45) having a plurality of magnetic pole portions (40a, 42a, 44a, 45a, 45b) arranged in parallel in a circumferential direction; a magnetic member (32, 34) located on a magnetic path between the magnetic pole portion of the first magnetic pole member and the magnetic pole portion of the second magnetic pole member and arranged in parallel in a circumferential direction; Equipped with The second magnetic pole member is stationary, and the magnetic member magnetically coupled to the first magnetic pole member rotates in accordance with the rotation of the first magnetic pole member, thereby transmitting a driving force; or The rotation of the magnetic member is fixed, and the second magnetic pole member, which is magnetically coupled to the first magnetic pole member, rotates in accordance with the rotation of the first magnetic pole member, thereby transmitting a driving force. The magnetic member is composed of magnetic rolling elements (32, 34) that are rotatably provided, The magnetic rolling element is configured in a cylindrical shape, The magnetic pole portion of the first magnetic pole member, the magnetic pole portion of the second magnetic pole member, and the magnetic rolling elements are arranged in a mixed manner, partly in the radial direction and partly in the axial direction, The magnetic rolling element is provided so that its central axis is aligned along the axial direction of the drive transmission device.

4. a partition member (50, 51) that separates the first magnetic pole member and the magnetic rolling body, or the magnetic rolling body and the second magnetic pole member; 4. The drive transmission device according to claim 2, wherein the magnetic rolling elements are configured to be in contact with the partition member and to be able to roll on the contact surface.

5. A valve device (12) that adjusts the flow rate of a refrigerant in a refrigeration cycle device (11) is provided to transmit a driving force to the valve device (12) that adjusts the flow rate of the refrigerant in the refrigeration cycle device (11).

5. The drive transmission device according to claim 4, wherein the partition member separates a first area (A1) into which the refrigerant enters and a second area (A2) into which the refrigerant is prohibited from entering.

6. The magnetic rolling element is configured in a cylindrical shape, The magnetic pole portion of the first magnetic pole member, the magnetic pole portion of the second magnetic pole member, and the magnetic rolling element are arranged in a radial direction or an axial direction, 3. The drive transmission device according to claim 1, wherein the magnetic rolling elements are provided so that their central axes are aligned in an axial direction or a radial direction.

7. 7. The drive transmission device according to claim 1, further comprising a function of setting the number of the magnetic pole portions of the first magnetic pole member, the number of the magnetic pole portions of the second magnetic pole member, and the number of the magnetic rolling bodies to different numbers, and of slowing down or accelerating the rotation transmitted from the first magnetic pole member.

8. 8. The drive transmission device according to claim 1, wherein the magnetic pole portion of the first magnetic pole member is configured as a magnetic pole portion using a permanent magnet or an electromagnet.

9. 9. The drive transmission device according to claim 1, wherein the magnetic pole portion of the second magnetic pole member is configured as a magnetic pole portion using a permanent magnet or an electromagnet, or a salient pole portion formed as a convex shape by a magnetic metal material.

10. The drive transmission device according to any one of claims 1 to 9, wherein the first magnetic pole member or the second magnetic pole member is configured such that a coating (24, 41, 43) is provided on the contact surface of the first magnetic pole member or the second magnetic pole member that contacts the magnetic rolling body.

11. The magnetic rolling elements are configured such that a plurality of the magnetic rolling elements arranged in parallel in the circumferential direction are held at intervals in the circumferential direction by a holding member (35, 37), 11. The drive transmission device according to claim 1, wherein the holding member or the magnetic rolling element is provided with a coating (36a, 36b, 38a, 38b) at a contact portion with a counterpart member.

Images