JP2004036798A - Friction roller type transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To almost completely remove metallic wear debris mixed in lubricating oil, thereby preventing an unfavorable influence upon an oil seal due to the metallic wear debris. <P>SOLUTION: An outer ring 32 (on the low speed side) is rotatably supported in a housing 1, and a high speed side shaft 17 is rotatably supported eccentrically with respect to the outer ring 32. Two guide rollers 37a, 37b and a movable roller 38 which moves when transmitting torque are provided between the outer ring 32 and the high speed side shaft 17. Oil seals 52, 51 for sealing the lubricating oil by making sliding contact with a low speed side shaft 3 and the high speed side shaft 17, are attached to the inner walls of the housing 1, 2. Metal removing magnets 61, 62 which attract the metallic wear debris mixed in the lubricating oil for removal are located at the portions adjacent to the oil seals 51, 52 where the lubricating oil can stick to the magnets. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is incorporated in, for example, machine tools, semiconductor manufacturing equipment, water turbines, windmills, and other rotary drive parts of various mechanical devices, and transmits the rotation of the drive shaft side to the driven side while reducing or increasing the speed. The present invention relates to a friction roller type transmission utilizing a wedge action, which can be used for driving a drive unit and an auxiliary machine.
[0002]
[Prior art]
The traction drive type transmission has been developed for various industrial uses because of its quietness and smoothness. In recent years, attempts have been made to apply it to personal use such as automobiles and bicycles, and it has attracted attention as a next-generation power transmission system. .
[0003]
A traction drive type transmission is different from a gear transmission in that at least two rotating bodies having a smooth surface are strongly pressed and a lubricating oil film (for example, an EHL oil film) is interposed therebetween to transmit power. The basic formula is represented by a simple friction formula of Ft = μ · Fc (Ft: traction force). Here, Fc is called a pressing force, and various methods have been developed for generating the pressing force.
[0004]
As one of the traction drive type transmissions, there is a friction roller type transmission utilizing a wedge action (hereinafter referred to as a wedge roller type transmission). The wedge roller type transmission includes an outer ring rotatably provided around an end of a high speed side shaft in an eccentric state with respect to the high speed side shaft, and a driven side which is an outer peripheral surface of the high speed side shaft. A power transmission is provided between the cylindrical surface and the drive-side cylindrical surface that is the inner peripheral surface of the outer ring, and is arranged in an annular space whose radial width is not uniform in the circumferential direction. A transmission having at least one guide roller and at least one movable roller as a cylindrical surface for use. The movable roller is a roller that generates a pressing force by a wedge action, and is a roller that moves in a radial direction and a circumferential direction.
[0005]
In such a friction roller type transmission, in the case of oil lubrication, the housing is filled with lubricating oil, and in order to prevent the oil from leaking, the low-speed side shaft and the high-speed side An oil seal sliding on the shaft is installed.
[0006]
Since it is a traction drive, wear on the traction surface of the friction roller is very small, and only a small amount of metal wear powder is generated due to friction between the roller and the sliding bearing.
[0007]
Moreover, when the low-speed side shaft and the high-speed side shaft are arranged horizontally, the amount of metal abrasion powder originally generated is small. This is rarely done and does not adversely affect the oil seal.
[0008]
Therefore, in the case of such a horizontal arrangement, a device for removing metal abrasion powder or the like is conventionally unnecessary.
[0009]
[Problems to be solved by the invention]
However, when the low-speed side shaft and the high-speed side shaft are arranged in the vertical direction, and when the upper and lower portions of these shafts change depending on the operating conditions, the generated metal wear powder is small. Also, metal abrasion powder may be mixed into the oil and penetrate into the oil seal together with the oil by the action of gravity, which may adversely affect the oil seal.
[0010]
The present invention has been made in view of the above-described circumstances, and almost completely removes metal wear powder mixed in lubricating oil, thereby reliably preventing metal wear powder from adversely affecting an oil seal. It is an object of the present invention to provide a friction roller type transmission utilizing a wedge effect.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a friction roller type transmission utilizing a wedge action according to claim 1 of the present invention rotatably supports a low speed side shaft in a housing, and has an outer ring at one end of the low speed side shaft. On the other hand, eccentric with respect to the low-speed side shaft and the outer ring, rotatably support the high-speed side shaft,
At least one guide roller and at least one movable roller that moves during torque transmission between the outer ring and the high-speed side shaft,
An oil seal for sealing lubricating oil filled in the housing while slidingly contacting the low-speed side shaft and the high-speed side shaft is attached to the housing inner wall,
A metal removing magnet for adsorbing and removing metal abrasion powder mixed into the lubricating oil is disposed at a location on the inner wall of the housing near the oil seal where the lubricating oil can adhere. .
[0012]
As described above, according to the first aspect of the present invention, metal abrasion powder mixed in the lubricating oil is adsorbed and removed at a location where the lubricating oil can be attached near the oil seal on the inner wall of the housing. The metal removing magnet is disposed.
[0013]
Therefore, when the low-speed side shaft and the high-speed side shaft are arranged in the vertical direction, or when the upper and lower portions of these shafts change depending on the operating conditions, the metal wear powder is mixed into the lubricating oil. Even if oil enters the oil seal together with the oil, the metal-removing magnet can adsorb metal abrasion powder mixed into the lubricating oil and remove it almost completely. As a result, the metal abrasion powder can be reliably prevented from adversely affecting the oil seal.
[0014]
Further, a friction roller type transmission utilizing a wedge effect according to claim 2 of the present invention rotatably supports a low-speed side shaft in a housing, and provides an outer ring at one end of the low-speed side shaft, while providing an outer ring at one end of the low-speed side shaft. Eccentric with respect to the shaft and the outer ring, rotatably supporting the high-speed side shaft,
At least one guide roller and at least one movable roller that moves during torque transmission between the outer ring and the high-speed side shaft,
An oil seal for sealing lubricating oil filled in the housing while slidingly contacting the low-speed side shaft and the high-speed side shaft is attached to the housing inner wall,
In the vicinity of the oil seal on the inner wall of the housing, at a place where lubricating oil can adhere, a metal removing unit is arranged,
The metal removing unit includes a metal removing magnet for adsorbing and removing metal abrasion powder mixed in the lubricating oil, a magnetic body arranged so that magnetic flux flows from the metal removing magnet, and a metal removing unit. And a non-magnetic material attached to the inner wall of the housing so as to substantially shield the magnet and the magnetic material from the inner wall of the housing.
[0015]
As described above, according to the second aspect, the metal removing unit is disposed at a location where the lubricating oil can adhere on the inner wall of the housing in the vicinity of the oil seal. A metal removing magnet for adsorbing and removing metal wear powder mixed in lubricating oil, a magnetic body arranged so that magnetic flux flows from the metal removing magnet, and a housing for housing the metal removing magnet and the magnetic body. And a non-magnetic material attached to the inner wall of the housing so as to be substantially magnetically shielded from the inner wall.
[0016]
Therefore, in this case, by the cooperation between the metal removing magnet and the magnetic material, the attraction force of the magnet can be further increased, and the metal wear powder can be more efficiently removed.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a wedge roller type transmission according to an embodiment of the present invention will be described with reference to the drawings.
[0018]
First, the internal structure of a wedge roller type transmission common to the embodiments will be described in detail, and then the embodiments of the present invention will be described.
[0019]
(Internal structure of wedge roller type transmission)
FIG. 1 is a sectional view of a wedge roller type transmission according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the wedge roller type transmission having a one-way clutch function along the line bb in FIG. 1, FIG. 3 is a diagram illustrating the operation of the wedge roller type transmission, and FIG. It is sectional drawing of the wedge roller type transmission which can transmit a torque at the time of rotation of both reverse directions.
[0020]
In the present embodiment, the wedge roller type transmission A functions as a speed increase gear having the low speed side shaft 3 (outer ring side) as an input side and the high speed side shaft 17 as an output side. However, the present invention can also be applied to a speed reducer having the low-speed side shaft 3 (outer ring side) as the output side.
[0021]
Also, as shown in FIG. 2, the wedge roller type transmission A has a one-way clutch function that transmits torque during forward rotation, but does not transmit torque when rotating reversely, As shown in FIG. 7, torque may be transmitted during both forward and reverse rotations.
[0022]
In a wedge roller type transmission A according to an embodiment of the present invention, a housing 2 which is a partition plate is fixed to a substantially cylindrical housing 1 in FIGS. A low-speed side shaft 3 is rotatably supported by the housing 1, and a disk-shaped member 4 is provided at an end of the low-speed side shaft 3 in the housing 1. An outer ring 32 is attached.
[0023]
The high-speed side shaft 17 is eccentrically (offset) with respect to the low-speed side shaft 3 and the outer ring 32 and is rotatably provided in the housing 2 serving as a partition plate.
[0024]
As shown in FIG. 2, a large-diameter guide roller 37a, a small-diameter guide roller 37b, and a movable roller 38 that moves during torque transmission are interposed between the outer ring 32 and the high-speed side shaft 17. is there.
[0025]
As shown in FIG. 3, the support shaft 39 b that rotatably supports the movable roller 38 is configured to be movable between the high-speed side shaft 17 and the outer ring 32 in a direction that bites into a “wedge”. It is urged by an elastic member 47 such as a compression spring installed in the cylinder hole 46 in a direction to bite into the “wedge”.
[0026]
As a result, as shown in FIG. 3, during normal rotation, the movable roller 38 moves between the high-speed side shaft 17 and the outer ring 32 in a direction to bite into a “wedge”, and generates a pressing force Fc. A traction force is generated by this Fc, and torque can be transmitted.
[0027]
On the other hand, at the time of reverse rotation, the movable roller 38 moves in a direction away from the “wedge”, the pressing force Fc becomes zero, the outer ring 32 idles, and the torque cannot be transmitted to the high-speed side shaft 17.
[0028]
As shown in FIG. 2, between the inner peripheral surface of the outer race 32 and the outer peripheral surface of the distal end portion of the high-speed shaft 17, there is provided an annular space 36 whose radial width is not uniform in the circumferential direction.
[0029]
In the annular space 36, two guide rollers 37a and 37b and one movable roller 38 are installed to constitute the wedge roller type transmission A. In FIG. 2, the movable roller 38 is partially cut away. Three support shafts 39a, 39a, 39b are provided in the annular space 36 for installing these rollers 37a, 37b, 38. Of the three support shafts 39a, 39a, 39b, the two support shafts 39a, 39a are press-fitted and fixed at both ends to fitting holes 40, 40 formed in the housing 2 and the connecting plate 14. . Therefore, the two support shafts 39a, 39a are not displaced in the circumferential direction or the diametric direction in the annular space 36. On the other hand, of the three support shafts 39a, 39a, 39b, the other one of the support shafts 39b located on the upper left side of FIG. The outer ring 32 is supported so as to be slightly displaceable in the circumferential and diametric directions. For this purpose, a support hole 41 having an inner diameter larger than the outer diameter of the support shaft 39b is formed in a part of the housing 2 and the connecting plate 14 which is aligned with both ends of the one support shaft 39b. Both ends of the support shaft 39b are loosely engaged with these support holes 41.
[0030]
The guide rollers 37a, 37b and the movable roller 38 are respectively mounted around the intermediate portions of the support shafts 39a, 39a, 39b supported as described above, by bearings such as radial needle bearings 42, 42, respectively. The bearing is rotatably supported by a bearing (not shown). In order to connect and fix the connecting plate 14 to the housing 2, the projecting portions 27, 27 projecting from one side of the connecting plate 14 are provided with the respective guide rollers with respect to the circumferential direction of the connecting plate 14. 37a, 37b and between the movable roller 38. In other words, each of the protrusions 27 and 27 and each of the guide rollers 37a and 37b or the movable roller 38 are present alternately in the annular space 36 in the circumferential direction of the annular space 36. In addition, the outer peripheral surface of each of the guide rollers 37a, 37b or the movable roller 38 does not interfere with (rub against) the circumferential side surface of each of the protrusions 27, 27.
[0031]
In this way, the outer peripheral surfaces of the guide rollers 37a, 37b and the movable roller 38 rotatably supported between the housing 2 and the connecting plate 14 by the support shafts 39a, 39a, 39b, The transmission cylindrical surfaces 43a, 43a, 43b abut against a driven cylindrical surface 44, which is the outer peripheral surface of the distal end of the high-speed shaft 17, and a drive cylindrical surface 45, which is the inner peripheral surface of the outer ring 32, respectively. Let me. As described above, the width in the radial direction of the annular space 36 in which the guide rollers 37a and 37b and the movable roller 38 are installed is not uniform in the circumferential direction. As described above, the outer diameters of the guide rollers 37a and 37b and the movable roller 38 are made different by the amount of making the width of the annular space 36 unequal in the circumferential direction. That is, of the guide rollers 37a and 37b and the movable roller 38, the movable roller 38 and the guide roller 37b, which are located on the side where the tip of the high-speed shaft 17 is eccentric with respect to the outer ring 32 (lower side in FIG. 2). Have the same outer diameter and are relatively small. On the other hand, the outer diameter of the guide roller 37a located on the opposite side (upper side in FIG. 2) of the tip of the high-speed side shaft 17 to the outer race 32 is determined by changing the outer diameter of the movable roller 38 and the guide roller 37b. It is larger than the outside diameter. The power transmission cylindrical surfaces 43a, 43a, 43b, which are the outer peripheral surfaces of the guide rollers 37a, 37b and the movable roller 38, are brought into contact with the driven side and drive side cylindrical surfaces 44, 45, respectively. .
[0032]
Note that, of the guide rollers 37a, 37b and the movable roller 38, both ends of the support shafts 39a, 39a supporting the guide rollers 37a, 37b are, as described above, with respect to the housing 2 and the connecting plate 14 ( (Within the annular space 36). On the other hand, the support shaft 39b supporting the movable roller 38 causes a slight displacement in the circumferential direction and the diametric direction with respect to the housing 2 and the connecting plate 14 (in the annular space 36) as described above. We support as much as possible. Therefore, the movable roller 38 can also be slightly displaced in the annular space 36 in the circumferential direction and the diametric direction. The support shaft 39b supporting the movable roller 38 is rotatably supported on the support shaft 39b by an elastic member 47 such as a compression spring installed in the cylinder hole 46 of the housing 2 and the connecting plate 14. The roller 38 is elastically lightly pressed so as to move the roller 38 toward the narrow portion of the annular space 36.
[0033]
When the rotating shaft is rotationally driven by the wedge roller type transmission according to the present invention configured as described above, a driving force is input to the low-speed side shaft 3 to rotate the outer ring 32 clockwise in FIG. . The rotation of the outer ring 32 is transmitted to the high-speed side shaft 17 via the guide rollers 37a and 37b and the movable roller 38, and rotates the high-speed side shaft 17 counterclockwise in FIG. The power transmission between the outer ring 32 and the guide rollers 37a and 37b and the movable roller 38 and the power transmission between the guide rollers 37a and 37b and the movable roller 38 and the high-speed shaft 17 are all frictional. Since transmission is performed, noise and vibration generated during power transmission are low.
[0034]
Further, the movable roller 38 tends to bite into the narrow portion (the lower central portion in FIG. 2) of the annular space 36 with a force corresponding to the magnitude of the torque transmitted from the outer ring 32 to the high-speed shaft 17. It becomes. Therefore, a contact portion between the drive-side cylindrical surface 45, which is the inner peripheral surface of the outer ring 32, and the power transmission cylindrical surfaces 43a, 43a, 43b, which are the outer peripheral surfaces of the guide rollers 37a, 37b and the movable roller 38, and The surface pressure of the contact portion between each of the power transmission cylindrical surfaces 43a, 43a, 43b and the driven-side cylindrical surface 44, which is the outer peripheral surface of the high-speed shaft 17, is higher as the torque is larger. Become. Conversely, when the torque is small, the surface pressure of each contact portion is low. For this reason, the torque can be efficiently transmitted by setting the surface pressure of each contact portion to an appropriate value corresponding to the torque to be transmitted.
[0035]
That is, when the outer ring 32 rotates clockwise in FIG. 2 and the high-speed side shaft 17 also rotates counterclockwise in the same manner, the movable roller 38 is driven by the driving cylinder, which is the inner peripheral surface of the outer ring 32. By receiving a force in the same direction as the pressing force of the elastic member 47 from the surface 45 and the driven-side cylindrical surface 44 which is the outer peripheral surface of the high-speed shaft 17, the annular space 36 has a narrow portion, that is, 2 tends to move toward the lower center.
[0036]
As a result, the power transmission cylindrical surface 43b, which is the outer peripheral surface of the movable roller 38, strongly presses the drive side cylindrical surface 45 and the driven side cylindrical surface 44. An inner diameter side contact portion 48, which is a contact portion between the power transmission cylindrical surface 43b and the driven cylindrical surface 44, and a contact between the power transmission cylindrical surface 43b and the drive side cylindrical surface 45. The contact pressure of the outer diameter side contact portion 49, which is the contact portion, increases. As described above, when the contact pressure of the inner and outer contact portions 48 and 49 with respect to the movable roller 38 increases, the movable roller 38 is pressed by the power transmission cylindrical surface 43b which is the outer peripheral surface of the movable roller 38. The high-speed side shaft 17 and the outer ring 32 are slightly displaced in the diameter direction due to elastic deformation and assembling clearance. As a result, the contact pressure of both the inner and outer contact portions 48 and 49 with respect to the guide rollers 37a and 37b increases. The rotational force of the outer ring 32 is transmitted to the high-speed shaft via the guide rollers 37a and 37b and the movable roller 38 based on the frictional engagement between the inner and outer diameter contact portions 48 and 49. 17 can be freely transmitted.
[0037]
As described above, the force for moving the movable roller 38 toward the narrow portion of the annular space 36 depends on the magnitude of the rotational driving force transmitted from the outer ring 32 to the high-speed side shaft 17. Change. The greater the force, the higher the contact pressure between the inner diameter side and the outer diameter side contact portions 48, 49. Therefore, based on such an operation, the contact pressure according to the transmitted rotational driving force is automatically selected, and the transmission efficiency of the wedge roller type transmission A can be secured.
[0038]
In the case of the example shown in FIG. 2, the wedge roller type transmission A has a one-way clutch function, and the rotation speed of the high-speed side shaft 17 matches the rotation speed of the outer ring 32, that is, this outer ring If the rotation speed of the wedge roller type transmission A becomes higher than the rotation speed of the wedge roller type transmission A, the connection of the wedge roller type transmission A is disconnected. That is, in this case, the movable roller 38 is displaced toward the wide side (the upper right side in FIG. 2) of the annular space 36 against the elasticity of the elastic member 47. As a result, the contact pressure between the inner diameter side and the outer diameter side contact portions 48 and 49 is reduced or lost, and the rotation of the outer ring 32 is not transmitted to the high speed side shaft 17.
[0039]
Next, a wedge roller type transmission shown in FIG. 4 that can transmit torque when rotating in both forward and reverse directions will be described.
[0040]
FIG. 4 shows a structure in which the high-speed shaft 17 (see FIG. 1) is rotatable in both clockwise and counterclockwise directions. In such a configuration of the present example, one guide roller 37 and two movable rollers 38a and 38b are used as the three rollers constituting the wedge roller type transmission A. . Among them, the roller installed in the widest part of the annular space 36 is a guide roller 37 having a relatively large diameter and the installation position does not change. On the other hand, a pair of rollers provided so as to sandwich the portion where the width of the annular space 36 becomes the narrowest is a movable roller 38a which has a relatively small diameter and enables a slight displacement in the circumferential and diametric directions. , 38b. The support shafts 39b and 39b supporting the movable rollers 38a and 38b are elastically pressed toward the narrowest portion of the annular space 36, respectively.
[0041]
In the case of the structure of the present embodiment configured as described above, when the outer ring 32 rotates clockwise in FIG. 4, the movable roller 38a on the right side in FIG. Bite into. On the other hand, when the outer ring 32 rotates counterclockwise in FIG. 4, the movable roller 38 b on the left side in FIG. 4 cuts into the narrowed portion of the annular space 36. Further, in the case of this example, in order to support both ends of the support shafts 39b, 39b supporting the movable rollers 38a, 38b, the annular shape of the support holes 41a, 41a formed in the housing 2 and the connecting plate 14 is set. The length of the space 36 in the circumferential direction is regulated. Specifically, the position of the end of each of the support holes 41a, 41a on the side where the width of the annular space 36 is wide (upper side in FIG. 4) is set to be larger than that in the case shown in FIG. The space 36 is brought closer to the position where the width becomes narrowest. The movable rollers 38a and 38b are prevented from retreating excessively to the wide side of the annular space 36.
[0042]
In the case of the present embodiment configured as described above, even when the outer ring 32 rotates in any of the clockwise and counterclockwise directions, any of the movable rollers 38a (38b) is a part of the annular space 36 having a narrow width. And the contact pressure of the contact portions 48 and 49 on the inner diameter side and the outer diameter side with respect to the movable roller 38a (38b) is increased. On the other hand, the retractable amount of the movable roller 38b (38a) displaced in the direction of retracting from the narrow portion of the annular space 36 is also limited. As a result, with respect to both the movable rollers 38a, 38b and the guide roller 37, the contact pressures of the contact portions 48, 49 on the inner diameter side and the outer diameter side are sufficiently increased, and from the outer ring 32 to the high speed side shaft 17, Motion can be transmitted efficiently. As described above, except that the power transmission from the rotating outer ring 32 to the high-speed side shaft 17 in both the clockwise and counterclockwise directions is enabled, the configuration is the same as that described above with reference to FIG. Omitted.
[0043]
(First embodiment of the present invention)
FIG. 5 is a sectional view of the wedge roller type transmission according to the first embodiment of the present invention.
[0044]
In the first embodiment, oil lubrication is used, and the housing 1 and the partition plate 2 are filled with lubricating oil. Further, in the wedge roller type transmission A, the low-speed side shaft 3 and the high-speed side shaft 17 are arranged so as to be vertical, and the high-speed side shaft 17 is located on the lower side.
[0045]
An oil seal 51 is mounted on the inner wall of the partition plate 2 (housing) to seal the lubricating oil while sliding on the high-speed shaft 17.
[0046]
An oil seal 52 for sealing lubricating oil while slidingly contacting the low-speed side shaft 3 is attached to the inner wall of the housing 1.
[0047]
A metal removing magnet 61 for adsorbing and removing metal abrasion powder mixed in the lubricating oil is disposed in the vicinity of the oil seal 51 where the lubricating oil can adhere. The reason why the metal removing magnet 61 is provided only in the vicinity of the lower oil seal 51 is that the metal abrasion powder is collected below the housings 1 and 2 by the action of gravity.
[0048]
Therefore, when the low-speed side shaft 3 and the high-speed side shaft 17 are arranged vertically, and the high-speed side shaft 17 is located on the lower side, metal wear powder is mixed into the lubricating oil. Therefore, even if the oil is to enter the oil seal 51 together with the oil, the metal abrasion powder mixed in the lubricating oil can be adsorbed and almost completely removed by the metal removing magnet 61. As a result, the oil seal 51 does not penetrate into the oil seal 51. As a result, it is possible to reliably prevent the metal seal dust from adversely affecting the oil seal 51.
[0049]
(Second embodiment of the present invention)
FIG. 6 is a sectional view of a wedge roller type transmission according to a second embodiment of the present invention.
[0050]
In the second embodiment, the wedge roller type transmission A is arranged such that the low-speed shaft 3 and the high-speed shaft 17 are arranged vertically, and the low-speed shaft 3 is located on the lower side. is there.
[0051]
A metal removing magnet 62 for adsorbing and removing metal abrasion powder mixed in the lubricating oil is disposed in the vicinity of the oil seal 52 where lubricating oil can adhere. The reason why the metal removing magnet 62 is provided only in the vicinity of the lower oil seal 52 is that the metal abrasion powder is collected below the housings 1 and 2 by the action of gravity.
[0052]
Therefore, when the low-speed side shaft 3 and the high-speed side shaft 17 are arranged vertically, and when the low-speed side shaft 3 is located on the lower side, metal wear powder is mixed into the lubricating oil. Then, even if it is attempted to penetrate into the oil seal 52 together with the oil, the metal abrasion powder mixed in the lubricating oil can be adsorbed and removed almost completely by the metal removing magnet 62, and the gravity As a result, the oil seal 52 does not enter the oil seal 52, and as a result, it is possible to reliably prevent the metal wear powder from adversely affecting the oil seal 52.
[0053]
(Third embodiment of the present invention)
FIG. 7 is a sectional view of a wedge roller type transmission according to a third embodiment of the present invention.
[0054]
In the third embodiment, the wedge roller type transmission A is a case where the upper and lower portions of the low-speed side shaft 3 and the high-speed side shaft 17 change depending on the operating conditions.
[0055]
Metal removing magnets 61 and 62 are arranged near both oil seals 51 and 52, respectively.
[0056]
Accordingly, when the upper and lower portions of the low-speed side shaft 3 and the high-speed side shaft 17 change depending on the operating conditions, the metal wear powder mixes with the lubricating oil and tries to enter the oil seals 51 and 52 together with the oil. Also, metal abrasion powder mixed into the lubricating oil can be adsorbed and almost completely removed by the metal removing magnets 61 and 62, and penetrate into the oil seals 51 and 52 by the action of gravity as in the related art. As a result, adverse effects of the metal wear powder on the oil seals 51 and 52 can be reliably prevented.
[0057]
(Fourth embodiment of the present invention)
FIG. 8 is a sectional view of a wedge roller type transmission according to a fourth embodiment of the present invention. FIGS. 9A and 9B are schematic diagrams for explaining the operation of the metal removing unit.
[0058]
A metal removing unit 70 is disposed on the inner walls of the housings 1 and 2 in the vicinity of the oil seals 51 and 52 where lubricating oil can adhere.
[0059]
The metal removing unit 70 includes a metal removing magnet 71 for adsorbing and removing metal wear powder mixed in the lubricating oil, and a pair of magnetic bodies 72 arranged so that magnetic flux flows from the metal removing magnet 71. And a non-magnetic body 73 attached to the inner walls of the housings 1 and 2 so as to substantially shield the metal removing magnet 71 and the pair of magnetic bodies 72 from the inner walls of the housings 1 and 2.
[0060]
As shown in FIG. 9A, when a pair of magnetic bodies 72 are arranged close to the shafts 3 and 17, the magnetic flux generated from the metal removing magnet 71 is changed from the magnetic body 72 to the shafts 3 and 17 to the magnetic body. A closed loop is formed in the path from 72 to the metal removing magnet 71. Therefore, as compared with the case where the magnet is used alone, a large magnetic flux acts between the shafts 3 and 17 and the pair of magnetic bodies 72, and even if the metal removing magnet 71 is small, the metal attracting force is increased due to a stronger attraction force. Powder can be removed.
[0061]
Further, in the case of FIG. 9A, as the distance between the pair of magnetic bodies 72 and the shafts 3 and 17 is reduced, the magnetic flux increases, and the attraction force can be further increased.
[0062]
Further, as shown in FIG. 9B, when the distance between the pair of magnetic bodies 72 and the shafts 3 and 17 cannot be reduced, the distance between the pair of magnetic bodies 72 can be reduced. The magnetic flux around the pair of magnetic bodies 72 is stronger than in the case where the distance between them is wide, and the attraction force can be further increased.
[0063]
As described above, in the fourth embodiment, the cooperation between the metal removing magnet and the magnetic material can further increase the attraction force of the magnet, and can remove metal wear powder more efficiently. it can.
[0064]
The present invention is not limited to the above-described embodiment, but can be variously modified.
[0065]
【The invention's effect】
As described above, according to the first aspect of the present invention, metal abrasion powder mixed in the lubricating oil is adsorbed and removed at a location where the lubricating oil can adhere on the inner wall of the housing near the oil seal. A metal removing magnet is provided for the removal.
[0066]
Therefore, when the low-speed side shaft and the high-speed side shaft are arranged in the vertical direction, or when the upper and lower portions of these shafts change depending on the operating conditions, the metal wear powder is mixed into the lubricating oil. Even if oil enters the oil seal together with the oil, the metal-removing magnet can adsorb metal abrasion powder mixed into the lubricating oil and remove it almost completely. As a result, the metal abrasion powder can be reliably prevented from adversely affecting the oil seal.
[0067]
According to the second aspect, the metal removing unit is disposed in the housing inner wall in the vicinity of the oil seal, where the lubricating oil can adhere, and the metal removing unit is provided with the lubricating oil. A metal removing magnet for adsorbing and removing metal abrasion powder mixed in oil, a magnetic body arranged so that a magnetic flux flows from the metal removing magnet, and a metal removing magnet and a magnetic body from the inner wall of the housing. And a non-magnetic material attached to the inner wall of the housing so as to be substantially magnetically shielded.
[0068]
Therefore, in this case, the attraction force of the magnet can be further increased by cooperation between the metal removing magnet and the magnetic body.
[Brief description of the drawings]
FIG. 1 is a sectional view showing the internal structure of a wedge roller type transmission according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line bb in FIG. 1;
FIG. 3 is a diagram illustrating the operation of a wedge roller type transmission.
FIG. 4 is a cross-sectional view of a wedge roller type transmission capable of transmitting torque when rotating in both forward and reverse directions according to the present invention.
FIG. 5 is a sectional view of the wedge roller type transmission according to the first embodiment of the present invention.
FIG. 6 is a sectional view of a wedge roller type transmission according to a second embodiment of the present invention.
FIG. 7 is a sectional view of a wedge roller type transmission according to a third embodiment of the present invention.
FIG. 8 is a sectional view of a wedge roller type transmission according to a fourth embodiment of the present invention.
FIGS. 9A and 9B are schematic views for explaining the operation of the metal removing unit.
[Explanation of symbols]
1 housing 2 housing (partition plate)
3 Low-speed side shaft 4 Disc-shaped member 14 Connecting plate 17 High-speed side shaft 23 Hole 24, 25 Angular contact ball bearing 26 Preload member 27 Projection 29 Seal member 30 Double row angular contact ball bearing 32 Outer ring (low-speed side)
36 Annular space 37, 37a, 37b Guide roller 38, 38a, 38b Movable roller 39a, 39b Support shaft 40 Fitting hole 41, 41a Support hole 42 Radial needle bearing 43 Power transmission cylindrical surface 44 Driven side cylindrical surface 45 Drive side Cylindrical surface 46 Cylinder hole 47 Elastic material 48 Inner diameter side contact part 49 Outer diameter side contact part 51, 52 Oil seal 61, 62 Metal removal magnet 70 Metal removal unit 71 Metal removal magnet 72 Magnetic body 73 Non-magnetic body A Wedge roller type transmission

Claims (2)

The low-speed side shaft is rotatably supported on the housing, and an outer ring is provided at one end of the low-speed side shaft, while the eccentricity is provided with respect to the low-speed side shaft and the outer ring, and the high-speed side shaft is rotatably supported,
At least one guide roller and at least one movable roller that moves during torque transmission between the outer ring and the high-speed side shaft,
An oil seal for sealing lubricating oil filled in the housing while slidingly contacting the low-speed side shaft and the high-speed side shaft is attached to the housing inner wall,
A metal removing magnet for adsorbing and removing metal abrasion powder mixed into the lubricating oil is disposed at a location on the inner wall of the housing near the oil seal where the lubricating oil can adhere. , Friction roller type transmission using wedge action. The low-speed side shaft is rotatably supported on the housing, and an outer ring is provided at one end of the low-speed side shaft, while the eccentricity is provided with respect to the low-speed side shaft and the outer ring, and the high-speed side shaft is rotatably supported,
At least one guide roller and at least one movable roller that moves during torque transmission between the outer ring and the high-speed side shaft,
An oil seal for sealing lubricating oil filled in the housing while slidingly contacting the low-speed side shaft and the high-speed side shaft is attached to the housing inner wall,
In the vicinity of the oil seal on the inner wall of the housing, at a place where lubricating oil can adhere, a metal removing unit is arranged,
The metal removing unit includes a metal removing magnet for adsorbing and removing metal abrasion powder mixed in the lubricating oil, a magnetic body arranged so that magnetic flux flows from the metal removing magnet, and a metal removing unit. A friction roller type transmission utilizing a wedge function, comprising: a non-magnetic material attached to the inner wall of the housing so as to substantially magnetically shield the magnet for use and the magnetic material from the inner wall of the housing.

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