Accelerator pedal device

Abstract

Accelerator pedal device (10), comprising: a housing (100) configured to be mounted on a vehicle body; a rotary shaft (200) mounted in the housing (100) and configured to rotate; and an actuating element (300) configured to be moved between an accelerator pedal idle position and an accelerator pedal full throttle position, wherein the actuating element (300) is biased toward the accelerator pedal idle position, wherein the actuating element (300) comprises a first contact portion (330) arranged at a first distance from the rotary shaft (200) and configured to be deformed by contact with an inner wall (130) of the housing (100) when the actuating element (300) is in the accelerator pedal idle position, and a second contact portion (350) arranged at a second distance from the rotary shaft (200) which is greater than the first distance, the second contact portion (350) is arranged at a predetermined distance from the inner wall (130) when the first contact portion (330) has an initial shape and the actuating element (300) is in the accelerator pedal idle position, and the second contact portion (350) is in contact with the inner wall (130) when the first contact portion (330) is deformed by more than a predetermined volume from the initial shape and the actuating element (300) is in the accelerator pedal idle position.

Description

Cross-reference to related applications

[0001] This application is based on and claims priority from Japanese Patent Application No. 2018-231500 filed on December 11, 2018, the entire disclosure of which is incorporated herein by reference. Technical field

[0002] The present disclosure relates to an accelerator pedal device. background

[0003] An accelerator pedal device in Patent Literature 1 includes a rotary shaft and an actuator. The actuator is formed integrally with the rotary shaft and is moved between an accelerator idle position and an accelerator full-throttle position by rotation of the rotary shaft.

[0004] Further prior art that was taken into account in the examination procedure can be found in KR 10 0 841 924 B1 and DE 11 2017 006 618 T5. Literature on the prior artPatent document

[0005] Patent literature 1: JP 2017-2932 A KR 10 0 841 924 B1 DE 11 2017 006 618 T5 Summary

[0006] In the accelerator pedal device in Patent Literature 1, the operating member includes a contact portion that contacts an inner wall of a housing when the operating member is in an accelerator idle position. In the above-described accelerator pedal device, when the operating member is moved toward the accelerator idle position, an impact noise is generated when the contact portion is brought into contact with the inner wall of the housing. Therefore, the accelerator pedal device aims to reduce the volume of the impact noise.

[0007] According to one aspect of the present disclosure, an accelerator pedal device is provided. The accelerator pedal device includes a housing, a rotary shaft, and an operating member. The housing is configured to be mounted on a vehicle body. The rotary shaft is supported in the housing and configured to rotate. The operating member is configured to be moved between an accelerator idle position and an accelerator full-throttle position and is biased toward the accelerator idle position. The operating member includes a first contact portion and a second contact portion. The first contact portion is arranged at a first distance from the rotary shaft and is configured to be deformed by contact with an inner wall of the housing when the operating member is in the accelerator idle position.The second contact portion is arranged at a second distance from the rotating shaft that is greater than the first distance. When the first contact portion has an initial shape and the operating member is in the accelerator idle position, the second contact portion is arranged at a predetermined distance from the inner wall. When the first contact portion is deformed by more than a predetermined volume from the initial shape and the operating member is in the accelerator idle position, the second contact portion is brought into contact with the inner wall. In a comparative example, an accelerator pedal device includes only one contact portion that is in contact with the inner wall of the housing when the operating member is in the accelerator idle position, and the contact portion is arranged at the second distance from the rotating shaft.Unlike the comparative example, according to the accelerator pedal device in the present disclosure, the first contact portion is arranged at a first distance from the rotating shaft. Therefore, the volume of impact noise caused by the contact of the first contact portion with the inner wall can be reduced compared to the comparative example. When wear or creep is generated at the first contact portion, the second contact portion is brought into contact with the inner wall similarly to the first contact portion. In this case, a force applied from the inner wall to the operating member is distributed between the first contact portion and the second contact portion. Thus, the first contact portion can be protected from further wear and creep.

[0008] The present disclosure may be implemented in various forms other than the accelerator pedal device. For example, the present disclosure may be implemented in an engine system having an accelerator pedal device, a vehicle having an accelerator pedal device, and the like. Short description of the illustrations

[0009] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description made with reference to the accompanying drawings. Fig. 1 is a schematic view illustrating an accelerator pedal device according to a first embodiment. Fig. 2 is an enlarged view showing a first contact portion and a second contact portion. Fig. 3 is an enlarged view showing a first contact portion and a second contact portion. Fig. 4 is a schematic view illustrating an accelerator pedal device in a comparative example. Fig. 5 is a schematic view illustrating an actuator. Fig. 6 is a schematic view showing a bearing in the accelerator pedal device. Fig. 7 is a schematic view illustrating the accelerator pedal device when the operating member is moved in an opening direction. Fig. 8 is a schematic view illustrating an accelerator pedal device in a comparative example. Fig. 9 is a schematic view illustrating the accelerator pedal device in the comparative example when the operating member is moved in an opening direction. Fig. 10 is a schematic view illustrating an accelerator pedal device according to another embodiment. Detailed DescriptionA. First Embodiment:

[0010] One in Fig. The accelerator pedal device 10 shown in Figure 1 is installed in a vehicle and corresponds to an input device operated by a driver to control an opening degree of a throttle valve (not shown) of an engine for the vehicle. An X-direction, a Y-direction, and a Z-direction shown in Fig. 1 are three spatial axes that are orthogonal to each other. The X-direction, the Y-direction and the Z-direction in Fig. 1 correspond to the X direction, the Y direction, and the Z direction in other figures, respectively. The accelerator pedal device 10 includes a housing 100, a rotary shaft 200, an actuator 300, and a biasing member 400.

[0011] The housing 100 can be attached to a vehicle body of the vehicle. In the present embodiment, a surface of the housing 100 facing the +X side in the X direction is fixed to the vehicle body of the vehicle. The housing 100 includes an inner wall 130. The inner wall 130 is provided along the Z direction and has a surface facing the -X side in the X direction. The housing 100 accommodates the rotary shaft 200, the actuator 300, and the biasing member 400.

[0012] The rotary shaft 200 extends along the Y direction. The rotary shaft 200 is configured to rotate integrally with the actuator 300. In other words, the rotary shaft 200 rotatably supports the actuator 300.

[0013] The actuator 300 extends in a radial direction of the rotary shaft 200. A pedal arm 310 is connected to the actuator 300. One end of the pedal arm 310 on the +Z side in the Z direction is connected to the actuator 300. The other end of the pedal arm 310 on the -Z side in the Z direction is connected to an accelerator pedal (not shown), which receives an input of an acceleration request from the driver of the vehicle. In the present embodiment, the actuator 300 and the pedal arm 310 are manufactured separately, and the pedal arm 310 is connected to the actuator 300. However, in the other embodiment, the actuator 300 and the pedal arm 310 may be integrally formed.

[0014] The actuating element 300 is movable in an opening direction OD and a closing direction CD when the rotary shaft 200 rotates. The actuating element 300 is preloaded in the closing direction CD. The actuating element 300 moves from an accelerator pedal idle position (in Fig. 1) in the counterclockwise direction of rotation when the actuator 300 is moved in the opening direction OD. The closing direction CD corresponds to a direction in which the actuator 300 moves in the clockwise direction of rotation.

[0015] The biasing member 400 is disposed on the +Z side in the Z direction, on one side of a first contact portion 330 with respect to the rotary shaft 200. The biasing member 400 contacts a surface of the operating member 300 facing the -X side in the X direction, and biases the operating member 300 toward the +X side in the X direction. In other words, the biasing member 400 biases the operating member 300 to move in the closing direction CD. When the accelerator pedal does not receive the acceleration request input from the vehicle driver, the operating member 300 is in the accelerator neutral position because the biasing member 400 biases the operating member 300.When the accelerator pedal receives the acceleration request input from the vehicle driver, and if the input is greater than the biasing force of the biasing member 400, the actuator 300 is rotationally moved from the accelerator pedal idle position in the opening direction OD. In the present embodiment, the biasing member 400 is a coil spring.

[0016] The operating member 300 includes the first contact portion 330 and a second contact portion 350. The first contact portion 330 is provided on a part of a surface of the operating member 300 facing the +X side in the X direction and protrudes toward the +X side in the X direction. The first contact portion 330 is located at a first distance L1 from the shaft center of the rotating shaft 200. Specifically, the first distance L1 is from the shaft center of the rotating shaft 200 to a center of the first contact portion 330 in the Z direction when the operating member 300 is in the accelerator idle position. When the operating member 300 is in the accelerator idle position, the first contact portion 330 is deformed by being brought into contact with the inner wall 130 facing the -X side in the X direction in the housing 100.

[0017] The second contact portion 350 is provided on a part of a surface of the operating member 300 facing the +X side in the X direction and protrudes toward the +X side in the X direction. The second contact portion 350 is located at a second distance L2 from the shaft center of the rotating shaft 200. The second distance L2 is greater than the first distance L1. Similar to the first contact portion 330, the second distance L2 is located in the Z direction from the shaft center of the rotating shaft 200 to a center of the second contact portion 350 when the operating member 300 is in the accelerator idle position.

[0018] Fig. 2 is an enlarged view showing a periphery of the first contact portion 330 and the second contact portion 350. When the operating member 300 is in the accelerator idle position in a state where the first contact portion 330 has an initial shape, the second contact portion 350 is arranged to have a predetermined distance DS from the inner wall 130. The initial shape represents a shape of the first contact portion 330 without deformation after the accelerator pedal device 10 is manufactured. When the operating member 300 is in the accelerator idle position in the state where the first contact portion 330 has the initial shape, the first contact portion 330 is in contact with the inner wall 130, while the second contact portion 350 is not in contact with the inner wall 130.

[0019] Fig. 3 is an enlarged view showing a periphery of the first contact portion 330 and the second contact portion 350. Unlike a Fig. 2 shown condition is in Fig. 3, the first contact portion 330 deforms from the initial shape due to wear or creep by more than or equal to a predetermined volume. In addition, Fig. 3 the second contact portion 350 in contact with the inner wall 130 after the deformation of the first contact portion 330.

[0020] Wear and creep may cause the first contact portion 330 to deform from its initial shape. Wear or creep may be caused by contact between the first contact portion 330 and the inner wall 130 when the actuator 300 returns to the accelerator idle position after moving in the opening direction OD in the closing direction CD. Wear means that a surface of the first contact portion 330 is worn due to repeated contacts between the first contact portion 330 and the inner wall 130. Creep means that the first contact portion 330 is plastically deformed to sink toward the -X side in the X direction by receiving stress from the inner wall 130.When the first contact portion 330 is deformed by more than or equal to the predetermined volume from the initial shape due to wear or creep, the second contact portion 350 is configured to be brought into contact with the inner wall 130 when the operating member 300 is in the accelerator pedal idle position. The predetermined volume corresponds to a preset deformation volume of the first contact portion 330 deformed by wear or creep in a period from the start of use of the accelerator pedal device 10 to the start of contact between the second contact portion 350 and the inner wall 130. The present amount changes depending on the setting of the distance DS.

[0021] In the accelerator pedal device 10 in the present embodiment, in a case where the first contact portion 330 has the initial shape when the operating member 300 is in the accelerator idle position, only the first contact portion 330 is in contact with the inner wall 130, while the second contact portion 350 is not in contact, as described with reference to FIG. Fig. 2 and Fig. 3. When the first contact portion 330 is deformed from the initial shape by more than or equal to the predetermined volume due to wear or creep, and when the operating member 300 is in the fully closed state, both the first contact portion 330 and the second contact portion 350 are in contact with the inner wall 130. Furthermore, the operating member 300 may be plastically deformed by a large force transmitted through the accelerator pedal due to a load applied to the accelerator pedal in the closing direction CD. In this case, when the operating member 300 is in the accelerator idle position, the first contact portion 330 and the second contact portion 350 may be in contact with the inner wall 130.

[0022] Fig. 4 shows an accelerator pedal device 10a in a comparative example. The accelerator pedal device 10a has the same structure as the accelerator pedal device 10 in the first embodiment, except that a contact portion 350a is included instead of the first contact portion 330 and the second contact portion 350.

[0023] The contact portion 350a is provided on a surface of the operating member 300 facing the +X side in the X direction and protrudes toward the +X side in the X direction. The contact portion 350a is located at the second distance L2 from the shaft center of the rotating shaft 200. When the operating member 300 is in the accelerator idle position, the contact portion 350a is brought into contact with the inner wall 130.

[0024] The contact portion 350a is located at the second distance L2 from the shaft center of the rotary shaft 200. In contrast, the first contact portion 330 in the present embodiment is located at the first distance L1 from the shaft center of the rotary shaft 200. Moreover, in the present embodiment, the first distance L1 is shorter than the second distance L2. Therefore, a speed at which the first contact portion 330 is brought into contact with the inner wall 130 in the present embodiment is smaller than a speed at which the contact portion 350a is brought into contact with the inner wall 130 in the comparative example. Therefore, in the present embodiment, the volume of an impact sound caused by contact of the first contact portion 330 with the inner wall 130 can be reduced.

[0025] In the present embodiment, the contact of the first contact portion 330 with the inner wall 130 may cause wear or creep at the first contact portion 330. In this case, when the operating member 300 is in the accelerator idle position, the second contact portion 350 is brought into contact with the inner wall 130, similarly to the first contact portion 330. Therefore, compared with a structure in which the inner wall 130 only contacts the first contact portion 330, the force applied from the inner wall 130 to the operating member 300 is distributed between the first contact portion 330 and the second contact portion 350. Therefore, further wear or creep at the first contact portion 330 can be restricted.

[0026] Fig. 5 shows the actuator 300 viewed in the X direction from the +X side. Both the first contact portion 330 and the second contact portion 350 have a curved surface shape. In the present embodiment, both the first contact portion 330 and the second contact portion 350 have a spherical shape. That is, the contact between the first contact portion 330 or the second contact portion 350 and the inner wall 130 corresponds to contact between a spherical surface and a surface. Here, a transmission operation of the stress from the inner wall 130 to the first contact portion 330 will be described using an example of the change in a contact state between the first contact portion 330 and the inner wall 130.At the time of contact between the first contact portion 330 and the inner wall 130, a point on the spherical surface of the first contact portion 330 is in contact with the inner wall 130. Thereafter, when the actuator 300 is further pressed toward the inner wall 130 in the closing direction CD, the first contact portion 330 is deformed in the X direction toward the -X side. As a deformation volume on the spherical surface of the first contact portion 330 is increased, the stress transmitted from the inner wall 130 to the first contact portion 330 is increased.

[0027] In a comparative example, an accelerator pedal device includes a first contact portion 330 formed in a flat shape. The flat surface of the first contact portion 330 contacts a flat surface of an inner wall 130. In this case, a contact area at the time of contact between the first contact portion 330 and the inner wall 130 is larger than that in the present embodiment. Therefore, from a first contact between the first contact portion 330 and the inner wall 130, the stress transmitted from the inner wall 130 to the first contact portion in the comparative example is relatively larger than that in the present embodiment. In contrast, in the present embodiment, a contact area between the first contact portion 330 and the inner wall 130 when the first contact portion 330 and the inner wall 130 come into contact with each other is small.Thereafter, the contact area gradually increases as the operating member 300 is moved in the closing direction CD. Therefore, the stress transmitted to the first contact portion 330 increases as the contact area increases. For this reason, a time until the stress is completely transmitted from the inner wall 130 to the first contact portion 330 may be longer in the accelerator pedal device 10 of the present embodiment than in the comparative example when the operating member 300 is moved to the accelerator idle position.

[0028] As a result of the inventors' investigation, the longer the time required for voltage transmission to complete, the lower the frequency of the impact sound caused by the contact between the first contact portion 330 and the inner wall 130. The sound of the impact sound at the low frequency is lower than that at the high frequency. Therefore, the driver's discomfort caused by the impact sound can be reduced.

[0029] When the actuator 300 is mounted on the housing 100, the first contact portion 330 or the second contact portion 350 may contact the inner wall 130 at an angle different from a target angle. Even in this case, since both the first contact portion 330 and the second contact portion 350 have the spherical shape, interference caused by the incorrect angle can be reduced compared to a case where both the first contact portion 330 and the second contact portion 350 have a curved surface shape but not the spherical surface shape.

[0030] Fig. 6 shows a bearing 120 of the accelerator pedal device 10, which is arranged in the housing 100. When viewing the accelerator pedal device 10 from the -Y side in the Y direction, the bearing 120 is behind the actuating element 300 in Fig. 1 not visible.

[0031] For the sake of simplicity of explanation, bearing 120 is in Fig. 6, however, is shown with a dashed line. The bearing 120 is formed in a tubular shape and supports the rotating shaft 200. Since a diameter of the bearing 120 is larger than a diameter of the rotating shaft 200, a gap is formed between the bearing 120 and the rotating shaft 200 while the bearing 120 supports the rotating shaft 200.

[0032] An arrangement relationship between the biasing member 400 and the first contact portion 330 will be described with reference to Fig. 6 described. Fig. 6 shows the accelerator pedal device 10 when the operating member 300 is in the accelerator idle position. In the accelerator pedal device 10, the biasing member 400 and the operating member 300 are in contact with each other at a contact part CP. The contact part CP intersects with a center axis of the biasing member 400 at an intersection point SC. A third distance α from the intersection point SP to the shaft center of the rotating shaft 200 is smaller than the first distance L1. Here, a biasing force UF is applied from the biasing member 400 to the operating member 300, and a stress SF is transmitted from the inner wall 130 to the first contact portion 330. In the arrangement relationship, a distance between a position where the biasing force UF is generated and the rotating shaft 200 is smaller than a distance between a position where the stress SF is generated and the rotating shaft 200.Therefore, the rotary shaft 200 preloads the bearing 120 at a position in the bearing 120 that is deviated or deflected toward the +X side in the X direction. The force with which the rotary shaft 200 preloads the bearing 120 is shown in the figures as preload force XF.

[0033] Fig. 7 shows the accelerator pedal device 10 when the actuating element 300 is moved from a Fig. 6 shown state in the opening direction OD. When transitioning from the state in Fig. 6 to a state in Fig. 7, that is, when the actuator 300 is moved in the opening direction OD, the rotary shaft 200 deflected in the bearing 120 to the +X side in the X direction continues to bias the bearing 120 to the +X side in the X direction. In other words, the rotary shaft 200 located in the bearing 120 rotates the actuator 300 while the rotary shaft 200 remains in contact with the bearing 120.

[0034] Fig. 8 shows an accelerator pedal device 10b in a comparative example. The accelerator pedal device 10b has the same configuration as the accelerator pedal device 10 in the first embodiment, except for a dispositional relationship between the biasing member 400 and the first contact portion 330. Fig. Fig. 8 shows the accelerator pedal device 10b when the actuating element 300 is in the accelerator pedal idle position, similar to Fig. 6.

[0035] In the accelerator pedal device 10b, a third distance α is greater than a first distance L1. The stress SF is transmitted from the inner wall 130 to the first contact portion 330, and the biasing force UF is applied from the biasing member 400 to the operating member 300. In the arrangement relationship of the comparative example, a distance between a position where the stress SF is generated and the rotary shaft 200 is smaller than a distance between a position where the biasing force UF is generated and the rotary shaft 200. The rotary shaft 200 biases the bearing 120 toward the -X side in the X direction at a position deflected toward the -X side in the X direction in the bearing 120.

[0036] Fig. 9 shows the accelerator pedal device 10b when the actuating element 300 is moved from a Fig. 8 shown state in the opening direction OD. When transitioning from the state in Fig. 8 to a state in Fig. 9, that is, when the actuator 300 is moved from the accelerator idle position in the opening direction OD, the rotary shaft 200 is moved from the -X side deflected position to a +X side deflected position in the X direction in the bearing 120. As a result, the rotary shaft 200 biases the bearing 120 in the X direction toward the +X side. At this point, the driver of the vehicle may feel uncomfortable when inputting an acceleration request via the accelerator pedal because the position of the rotary shaft 200 in the bearing 120 is moved from the -X side to the +X side in the X direction.

[0037] According to the accelerator pedal device 10 of the present embodiment, when the operating member 300 moves in the opening direction OD, the rotating shaft 200 maintains the deflected state in the bearing 120 to the +X side to bias the bearing 120 toward the +X side in the X direction. This prevents the driver from feeling uncomfortable when pushing the operating member 300 in the opening direction OD.

[0038] In the above-described embodiment, the impact noise generated by the contact of the first contact portion 330 with the inner wall 130 can be reduced. Further, in the above-described embodiment, in addition to the first contact portion 330, the second contact portion 350 is also brought into contact with the inner wall 130 when the wear or creep is generated at the first contact portion 330. Accordingly, the force applied from the inner wall 130 to the actuator 300 is distributed between the first contact portion 330 and the second contact portion 350. Therefore, the wear or creep at the first contact portion 330 can be further restricted. B. Further embodiments:

[0039] Fig.10 shows an accelerator pedal device 12 in the further embodiment. The accelerator pedal device 12 has the same configuration as the accelerator pedal device 10 in the first embodiment, except that an inner wall 130 in the further embodiment includes a first curved portion 133 and a second curved portion 135. Both the first curved portion 133 and the second curved portion 135 have a curved surface shape and protrude from the inner wall 130 in the X direction to the -X side. The first curved portion 133 is arranged to be brought into contact with the first contact portion 330 when the operating member 300 is in the accelerator idle position.The second curved portion 135 is arranged to be brought into contact with the second contact portion 350 when the first contact portion 330 is deformed from the initial shape by more than or equal to the predetermined volume due to wear or creep. A time required for completing the transmission of stress from the inner wall 130 to the first contact portion 330 and the second contact portion 350 can be extended when the operating member 300 is moved to the accelerator idle position.

[0040] In the accelerator pedal device 10 of the above embodiments, both the first contact portion 330 and the second contact portion 350 have spherical shapes, but the present disclosure is not limited thereto. For example, both the first contact portion 330 and the second contact portion 350 may have curved surface shapes other than the spherical shapes, or one of them may have a spherical shape while the other has a curved surface shape other than the spherical shape. Further, one of the first contact portion 330 and the second contact portion 350 may have a curved surface shape. Both the first contact portion 330 and the second contact portion 350 preferably have a shape in which a cross-sectional area increases with increasing distance from the inner wall 130.As a result, the contact area between the inner wall 130 and the first contact portion 330 or the second contact portion 350 is small at a moment of contact and is gradually increased as the actuator 300 is moved in the closing direction CD.

[0041] Configurations of the accelerator pedal device 10 in the above embodiments can be applied to a device including a clutch pedal and a brake pedal.

[0042] The present disclosure is not intended to be limited to the embodiments or modifications described above, and various other embodiments may be implemented without departing from the scope of the present disclosure. For example, the technical features in each embodiment that correspond to the technical features in the form described in the summary can be used to solve some or all of the problems described above or to achieve any of the effects described above. To achieve part or all, substitution or combination may be appropriately made. In addition, as long as a technical feature is not described as essential in the present specification, the technical feature may be appropriately deleted.

Claims

[1] Accelerator pedal device (10), comprising: a housing (100) configured to be mounted on a vehicle body; a rotary shaft (200) mounted in the housing (100) and configured to rotate; and an actuating element (300) configured to be moved between an accelerator pedal idle position and an accelerator pedal full throttle position, wherein the actuating element (300) is biased toward the accelerator pedal idle position, wherein the actuating element (300) comprises a first contact portion (330) arranged at a first distance from the rotary shaft (200) and configured to be deformed by contact with an inner wall (130) of the housing (100) when the actuating element (300) is in the accelerator pedal idle position, and a second contact portion (350) arranged at a second distance from the rotary shaft (200) which is greater than the first distance, the second contact portion (350) is arranged at a predetermined distance from the inner wall (130) when the first contact portion (330) has an initial shape and the actuating element (300) is in the accelerator pedal idle position, and the second contact portion (350) is in contact with the inner wall (130) when the first contact portion (330) is deformed by more than a predetermined volume from the initial shape and the actuating element (300) is in the accelerator pedal idle position. [2] The accelerator pedal device (10) according to claim 1, wherein the first contact portion (330) has a curved surface shape. [3] The accelerator pedal device (10) according to claim 1 or 2, wherein the second contact portion (350) has a curved surface shape. [4] Accelerator pedal device (10) according to one of claims 1 to 3, further comprising: a biasing element (400) arranged on one side of the first contact portion (330) starting from the rotary shaft (200) to bias the actuating element (300) toward the accelerator pedal idle position, wherein the actuating element (300) rotates integrally with the rotary shaft (200), the housing (100) comprises a bearing (120) formed in a tubular shape to support the rotary shaft (200), a diameter of the bearing (120) is larger than a diameter of the rotating shaft (200), the biasing element (400) and the actuating element (300) are in contact with each other at a contact part, and the contact part intersects a central axis of the biasing element (400) at an intersection point, a third distance from the intersection point to the rotary shaft (200) is present, and the third distance is shorter than the first distance.

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