JP2006300754A - Rotor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance measuring precision of tension of an endless transmission body wound around a rotor. <P>SOLUTION: An endless belt is wound around an outer circumferential side member supported rotatably via a ball bearing in an outer circumference, in an inner circumferential side member 15 fixed onto a fixing part by a bolt 22. The inner circumferential side member 15 is provided with: an outer circumferential part 23 engaged with an inner race 19 of the ball bearing; an inner circumferential part 24 fixed with the bolt 22; a connection part 25 for connecting the inner circumferential part 24 and the outer circumferential part 23; and a strain gage 26 for detecting a deformation of the connection part 25 by a load based on the tension of the endless belt. A regulation means 28 having a roller guided by roller guide faces 23a, 24a in parallel to the connection part 25 is arranged between the inner circumferential part 24 and the outer circumferential part 23, and only a connection-directional pure tension load acts thereby on the connection part 25, but a bending load and a sharing load do not act thereon to enhance the measuring precision of the tension of the endless belt. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for measuring the tension of an endless transmission such as an endless belt wound around a pulley or an endless chain wound around a sprocket.

  Since it is difficult to directly measure the tension of an endless belt that is wound around a pulley and transmits a driving force, the tension is generally measured from the load applied to the pulley around which the endless belt is wound. It has been broken.

A tension measuring pulley 1 described in the following Patent Document 1 is configured such that an outer pulley member 2 is rotatably supported via a bearing member 4 on an outer periphery of an inner mounting member 3 fixed to a fixed portion. 3 is affixed to the fitting part 3a that fits the bearing member 4, the attachment part 3b that is fixed to the fixing part, the rod-like part 3c that connects the fitting part 3a and the attachment part 3b, and the stick-like part 3c. The strain gauges 11a to 11d are configured to detect the deformation amount of the rod-shaped portion 3c due to the load received from the endless transmission wound around the tension measuring pulley 1, and the strain gauges 11a to 11d detect the endless transmission based on the detection results. It is designed to measure body tension.
Japanese Patent Laid-Open No. 5-180714

  However, in the above conventional one, the direction in which the rod-shaped portion 3c to which the strain gauges 11a to 11d are attached is not restricted, so that the rod-shaped portion 3c is stretched, bent, or twisted by a load applied from the endless transmission. As a result, the correspondence between the output of the strain gauges 11a to 11d and the tension of the endless transmission is not unique, and there is a problem that the measurement accuracy of the tension is lowered.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to increase the measurement accuracy of the tension of an endless transmission wound around a rotating body.

  In order to achieve the above object, according to the invention described in claim 1, the rotating body around which the endless transmission body is wound is fixed to the outer peripheral member that contacts the endless transmission body and the mounting portion to which the rotating body is attached. An inner peripheral member, and a bearing that rotatably supports the outer peripheral member on the inner peripheral member. The inner peripheral member further includes an inner peripheral portion fixed to the mounting portion, and a bearing. In the rotating body device comprising an outer peripheral portion in contact with the inner periphery, and an elastically deformable connecting portion connecting the inner peripheral portion and the outer peripheral portion, and measuring the tension of the endless transmission band by detecting the deformation of the connecting portion. A regulating means for allowing the outer peripheral portion to move relative to the inner peripheral portion in the connecting direction of the connecting portion and restricting relative movement and relative rotation in the other direction between the inner peripheral portion and the outer peripheral portion. Rotating body characterized by arranging Location is proposed.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the restricting means includes a roller disposed between the inner peripheral portion and the outer peripheral portion, and the inner peripheral portion and the outer peripheral portion. There is proposed a rotating body device including a roller guide surface formed on each of the portions and guiding a roller in a connecting direction of the connecting portion.

  According to the invention described in claim 3, in addition to the configuration of claim 2, the restricting means determines the relative movement distance in the connecting direction of the connecting portion between the inner peripheral portion and the outer peripheral portion as the connecting portion. There is proposed a rotating body device having a stopper surface that regulates the deformation amount of the portion to be equal to or less than the limit deformation amount.

  According to the invention described in claim 4, in addition to the configuration of any one of claims 1 to 3, the connection direction of the connecting portion is determined by the load applied to the rotating body by the tension of the endless transmission. A rotating body device is proposed which is characterized by being matched with the direction of

  The pulley 11 of the embodiment corresponds to the rotating body of the present invention, the endless belt 12 of the embodiment corresponds to the endless transmission of the present invention, and the ball bearing 16 of the embodiment corresponds to the bearing of the present invention.

  According to the configuration of the first aspect, between the inner peripheral portion and the outer peripheral portion of the inner peripheral side member that rotatably supports the outer peripheral side member via the bearing, the outer peripheral portion connects them to the inner peripheral portion. Since a restricting means that allows relative movement in the connecting direction of the parts and restricts relative movement and relative rotation in other directions is arranged, the tension of the endless transmission body is increased to the inner peripheral side via the outer peripheral member and the bearing. When transmitted to the member, only the compressive load or tensile load in the connecting direction can be transmitted to the connecting portion to prevent the bending load or shear load from acting. As a result, the amount of deformation of the connecting portion becomes a value that accurately reflects the tension of the endless transmission, and the measurement accuracy of the tension can be increased.

  According to the second aspect of the present invention, since the restricting means includes the roller guide surfaces formed on the inner peripheral portion and the outer peripheral portion of the inner peripheral side member to guide the roller in the connecting direction of the connecting portion, the measurement accuracy is improved. While the frictional force to be reduced is minimized, the inner peripheral portion and the outer peripheral portion are relatively moved only in the connecting direction of the connecting portion, and relative movement and relative rotation in other directions can be reliably suppressed.

  According to the configuration of the third aspect, the stopper provided in the restricting means determines the relative movement distance in the connecting direction between the inner peripheral portion of the inner peripheral side member and the outer peripheral portion in the connecting direction, and the deformation amount of the connecting portion is less than the limit deformation amount. Therefore, even if a large load is applied to the rotating body from the endless transmission body, it is possible to prevent the connection portion from being damaged.

  According to the configuration of the fourth aspect, since the connecting direction of the connecting portion coincides with the direction of the load applied to the rotating body by the tension of the endless transmission body, the deformation amount of the connecting portion is accurately detected and the tension of the endless transmission body is detected. Can be measured with high accuracy.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 to 4 show an embodiment of the present invention. FIG. 1 is a front view of a pulley around which an endless belt is wound, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, and FIG. FIG. 4 is an enlarged view of part 4 of FIG.

  As shown in FIGS. 1 and 2, the pulley 11 has an outer peripheral side member 13 around which the endless belt 12 is wound, an inner peripheral side member 15 fixed to the mounting portion 14, and an outer peripheral side with respect to the inner peripheral side member 15. And a ball bearing 16 that rotatably supports the member 13. The ball bearing 16 has a large number of balls 17 held between the outer race 18 and the inner race 19, and the outer peripheral surface of the outer race 18 is fixed to the inner peripheral surface of the outer peripheral member 13 by press-fitting. The peripheral surface is fixed to the outer peripheral surface of the inner peripheral member 15 by press-fitting.

  A washer 20 and a collar 21 are overlapped on both surfaces of the inner peripheral side member 15, and a bolt 22 penetrating the washer 20, the inner peripheral side member 15 and the collar 21 is fastened to a female screw 14 a formed in the mounting portion 14. The inner peripheral side member 15 is fixed to the mounting portion 14 so as not to rotate.

  3 and 4, the inner peripheral member 15 is formed with an annular outer peripheral portion 23 that is press-fitted into the inner race 19 of the ball bearing 16 and a bolt hole 24c through which the bolt 22 passes. The inner peripheral portion 24 and a thin connecting portion 25 that extends in the radial direction with respect to the axis of the bolt 22, that is, the rotation axis L of the pulley 11 and connects the inner peripheral portion 24 and the outer peripheral portion 23. . The fastening force of the bolt 22 acts only on the inner peripheral portion 24, and the fastening force of the bolt 22 does not act on the outer peripheral portion 23 and the connecting portion 25 having a minute gap between the washer 20 and the collar 21. Therefore, when a load is applied to the outer peripheral portion 23, the connecting portion 25 is elastically deformed, so that the outer peripheral portion 23 can move relative to the inner peripheral portion 24. The direction in which the connecting portion 25 extends coincides with the direction of the bisector of the angle 2θ formed by the two strings 12 a and 12 b of the endless belt 12 wound around the pulley 11. Strain gauges 26 and 26 are affixed to both surfaces of the connecting portion 25, and lead wires 27 and 27 extending from the strain gauges 26 and 26 are drawn out from a notch 20 a formed in the washer 20.

  Between the outer peripheral part 23 and the inner peripheral part 24 of the inner peripheral side member 15, four regulating means 28 ... spaced apart in the circumferential direction are arranged. Since these restricting means 28 have substantially the same structure, only one restricting means 28 shown in FIG. 4 will be described.

  A linear roller guide surface 23a parallel to the extending direction of the connecting portion 25 and a partial arc-shaped stopper surface 23b connected to the upper end of the roller guide surface 23a are formed on the inner surface of the outer peripheral portion 23, and the inner peripheral portion 24 is formed. A linear roller guide surface 24a parallel to the extending direction of the connecting portion 25 and a partial arc-shaped stopper surface 24b connected to the lower end of the roller guide surface 24a are formed on the outer surface of the roller guide surface 23a, A roller 29 comes into contact with 24a so as to allow rolling. The radii of the stopper surfaces 23b and 24b of the outer peripheral portion 23 and the inner peripheral portion 24 are the same as the radius of the roller 29, and the outer peripheral surface of the roller 29 can contact the stopper surfaces 23b and 24b without any gap.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  In FIG. 1, when a load T0 based on the tension T of the endless belt 12 acts on the outer peripheral side member 13 of the pulley 11 around which the endless belt 12 is wound, the load T0 based on the tension T is applied from the outer peripheral side member 13 to the ball bearing. 16 is transmitted to the inner circumferential side member 15 via 16. At this time, since the inner peripheral portion of the inner peripheral side member 15 is fixed to the attachment portion 14 with the bolt 22, tensile stress is generated in the connecting portion 25 connecting the outer peripheral portion 23 and the inner peripheral portion 24 by the load T0, The strain gauges 26 and 26 detect the load T0 due to the elongation deformation of the connecting portion 25.

  At this time, the direction in which the connecting portion 25 extends coincides with the direction of the bisector of the angle 2θ formed by the two strings 12a and 12b of the endless belt 12 wound around the pulley 11, so that in theory, the load T0 should act only on the connecting portion 25 as a tensile load, but in reality, a bending load or a shearing load acts on the connecting portion 25 due to the friction of the endless belt 12 or the ball bearing 16, and the bending If the load or shear load is detected by the strain gauges 26 and 26, the measurement accuracy of the tension T may be lowered.

  However, according to this embodiment, the rollers 29 of the four restricting means 28 are guided by the roller guide surfaces 23a of the outer peripheral portion 23 and the roller guide surfaces 24a of the inner peripheral portion 24 to roll. Since the connecting portion 25 is allowed to extend and deform only in the radial direction of the pulley 11 (that is, the connecting direction of the connecting portion 25), the strain gauges 26 and 26 are connected to the connecting portion 25. Only the radial load T0 can be detected with high accuracy.

Thus, for example, if the winding angle of the endless belt 12 with respect to the pulley 11 is 90 °, between the load T0 acting on the pulley 11 and the tension T of the endless belt 12,
T0 = √2T
Therefore, the tension T of the endless belt 12 can be calculated from the load T0 based on this relationship.

  Further, when the tension T of the endless belt 12 becomes excessive, the deformation amount of the connecting portion 25 may exceed the limit deformation amount and may be damaged. However, the relative movement distance between the outer peripheral portion 23 and the inner peripheral portion 24 of the inner peripheral side member 15 is large. When the predetermined value is exceeded, the roller 29 of each regulating means 28 comes into contact with the stopper surface 23b of the outer peripheral portion 23 and the stopper surface 24b of the inner peripheral portion 24 so that the deformation amount of the connecting portion 25 does not exceed the limit deformation amount. regulate. Thereby, damage to the connecting portion 25 can be reliably prevented and the durability of the pulley 11 can be enhanced.

  Although the embodiments of the present invention have been described above, various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the pulley 11 is used as the rotating body and the endless belt 12 is used as the endless transmission body. However, the rotating body may be a sprocket, and the endless transmission body may be an endless chain.

  In the embodiment, a tensile load acts on the connecting portion 25, but a compressive load may act.

  In the embodiment, the direction in which the connecting portion 25 extends matches the direction of the load T0. However, the direction in which the connecting portion 25 extends and the direction of the load T0 may form a predetermined angle. Even in such a case, it is possible to prevent the load other than the tensile load or the compressive load from being applied to the connecting portion 25 by the function of the regulating means 28.

  In the embodiment, four regulating means 28 are provided, but the number thereof is arbitrary.

  In the embodiment, the winding angle of the endless belt 12 with respect to the pulley 11 is set to 90 °, but the winding angle is arbitrary.

Front view of pulley with endless belt wrapped around 2-2 sectional view of FIG. 3-3 sectional view of FIG. 4 enlarged view of FIG.

Explanation of symbols

11 Pulley (Rotating body)
12 Endless belt (endless transmission)
13 Outer peripheral member 14 Mounting portion 15 Inner peripheral member 16 Ball bearing (bearing)
23 outer peripheral portion 23a roller guide surface 23b stopper surface 24 inner peripheral portion 24a roller guide surface 24b stopper surface 25 connecting portion 28 restricting means 29 roller T tension T0 load

Claims (4)

The rotating body (11) around which the endless transmission body (12) is wound is fixed to the outer peripheral side member (13) in contact with the endless transmission body (12) and the attachment portion (14) to which the rotating body (11) is attached. An inner peripheral member (15) and a bearing (16) that supports the outer peripheral member (13) on the inner peripheral member (15) so as to be relatively rotatable,
Further, the inner peripheral member (15) includes an inner peripheral portion (24) fixed to the attachment portion (14), an outer peripheral portion (23) in contact with the inner periphery of the bearing (16), and an inner peripheral portion (24). ) And an elastically deformable connecting portion (25) for connecting the outer peripheral portion (23), and detecting the deformation of the connecting portion (25) to measure the tension of the endless transmission (12). In
Allowing the outer peripheral portion (23) to move relative to the inner peripheral portion (24) in the connecting direction of the connecting portion (25) between the inner peripheral portion (24) and the outer peripheral portion (23); A rotating body device comprising a restricting means (28) for restricting relative movement and relative rotation in other directions.   The regulating means (28) is formed on the roller (29) disposed between the inner peripheral portion (24) and the outer peripheral portion (23), and on the inner peripheral portion (24) and the outer peripheral portion (23), respectively. The rotating body device according to claim 1, further comprising roller guide surfaces (23a, 24a) for guiding the roller (29) in a connecting direction of the connecting portion (25).   The restricting means (28) determines the relative movement distance in the connecting direction of the connecting portion (25) of the inner peripheral portion (24) and the outer peripheral portion (23), and the deformation amount of the connecting portion (25) is the limit deformation. The rotating body device according to claim 2, further comprising a stopper surface (23b, 24b) for regulating the amount to be equal to or less than the amount. The connecting direction of the connecting portion (25) is made to coincide with the direction of the load (T0) applied to the rotating body (11) by the tension (T) of the endless transmission (12). The rotating body device according to claim 3.

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