Rotation device and position sensor

Abstract

A rotation device and a position sensor according to the present invention are provided with: a shaft-shaped body extending in the axial direction; a housing having a shaft hole and supporting the shaft-shaped body such that the shaft-shaped body passing through the shaft hole can rotate; a sealing member that blocks a gap between the peripheral wall of the shaft hole and the shaft-shaped body from one side in the axial direction; and a seal pressing member that is fitted into the gap at a position closer to one side in the axial direction than the position of the seal and prevents the seal from moving from the other side in the axial direction to the one side in the axial direction, the hole peripheral wall having a press-fitted hole peripheral wall portion into which the seal pressing member is press-fitted.

Description

Technical Field

[0001] The invention relates to a rotating device and a position sensor. Background Art

[0002] For example, Patent Document 1 discloses a position sensor comprising: a shaft; a housing; a bearing disposed in a gap between the housing and the shaft and rotatably supporting the shaft; and a brush table connected to the shaft, wherein the housing has a recess for accommodating the brush table, the recess being disposed on one side of the gap between the bearing and the shaft, a connector being fixed to the recess in a manner opposite to the brush table, a resistor substrate being fixed to a surface of the connector opposite to the brush table, a portion of a connection terminal being embedded in the connector, and one end of the terminal being connected to the resistor of the resistor substrate.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Utility Model Application Laid-Open No. 4-107802 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] However, in the position sensor described in Patent Document 1, if foreign matter such as dust enters the recess through the gap, the measured value will change, so the measurement accuracy will be reduced due to measurement error. Therefore, in order to prevent the entry of foreign matter, it is considered to block the gap with a seal.

[0008] However, there is a problem that, for example, the seal may move in the gap and fall off from the gap during use of the position sensor.

[0009] An object of the present invention is to provide a rotating device and a position sensor capable of preventing a seal from falling off.

[0010] Solutions to the problem

[0011] In order to achieve the above object, the rotating device of the present invention has:

[0012] Axial body, extending in the axial direction;

[0013] A housing having an axial hole for supporting the axial body in a manner that allows the axial body passing through the axial hole to rotate;

[0014] A sealing member, which blocks the gap between the peripheral wall of the axial hole and the axial body from one axial side; and

[0015] The seal pressing member is engaged with the gap at a position closer to one side in the axial direction than the seal, so as to prevent the seal from moving from the other side in the axial direction to the one side in the axial direction.

[0016] The hole peripheral wall has a pressed hole peripheral wall portion, and the sealing member pressing member is pressed into the pressed hole peripheral wall portion.

[0017] In addition, the position sensor of the present invention comprises:

[0018] The above-mentioned rotating device;

[0019] A slider mounted on the shaft-shaped body; and

[0020] The resistor substrate has a resistor body, and the slider slides on the resistor body in response to the rotation of the shaft body.

[0021] The housing has a receiving portion for receiving the slider and the resistor substrate.

[0022] The accommodation portion is arranged at a position closer to the other side in the axial direction than the gap between the shaft-shaped body and the peripheral wall portion of the small-diameter hole.

[0023] Effects of the Invention

[0024] According to the present invention, it is possible to prevent the seal from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a partial perspective view showing a position sensor according to an embodiment of the present invention.

[0026] Figure 2 It is a cross-sectional view showing a position sensor according to an embodiment of the present invention.

[0027] Figure 3 It is a partial cross-sectional view of the rotating device according to the embodiment of the present invention, and is a partial cross-sectional view showing a state before a seal and a seal pressing member are assembled.

[0028] Figure 4A It is a top view of the seal pressing member according to the embodiment of the present invention.

[0029] Figure 4B It is a front view of the seal pressing member according to the embodiment of the present invention.

[0030] Figure 5 It is a perspective view of a seal presser according to an embodiment of the present invention.

[0031] Figure 6 It is a partial cross-sectional view of the rotating device according to the embodiment of the present invention, and is a partial cross-sectional view showing a state after a seal is assembled and before a seal pressing member is assembled.

[0032] Figure 7It is a partial cross-sectional view of the rotating device according to the embodiment of the present invention, and is a partial cross-sectional view showing a state where a seal and a seal pressing member are assembled.

[0033] Description of Reference Numerals

[0034] 1 Axis

[0035] 2 Housing

[0036] 2a Shaft hole

[0037] 2b Accommodation

[0038] 3. Clearance

[0039] 3a Gap

[0040] 4 Seals

[0041] 5 Seal compression piece

[0042] 6 Sliders

[0043] 7 Resistor substrate

[0044] 8 Resistor

[0045] 20 barrel

[0046] 21 Hole wall

[0047] 21a One side opening

[0048] 22 Extension for thermal compression bonding

[0049] 23 Large diameter hole peripheral wall

[0050] 24 Positioning step

[0051] 25 Middle diameter hole wall

[0052] 26 Inclined part

[0053] 27 is pressed into the hole wall

[0054] 28 Step portion for sealing member accommodation

[0055] 29 Small diameter hole wall

[0056] 51 Large diameter part

[0057] 52 Middle diameter

[0058] 53 Small Trail

[0059] 54 Press-in section

[0060] 55 convex part

[0061] 100 Rotating device

[0062] 200 Position Sensor DETAILED DESCRIPTION

[0063] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0064] Figure 1 It is a partial perspective view showing a rotating device in an embodiment of the present invention. Figure 2 1 is a cross-sectional view showing a position sensor according to an embodiment of the present invention. Figure 2 In the diagram, the left-right direction is called the X direction or radial direction, the direction away from the Y axis is called the radial outer side or "+X direction", and the direction approaching the Y axis is called the radial inner side or "-X direction". In addition, the up-down direction is called the Y direction or axial direction, the upper direction is called the other axial side or "+Y direction", and the lower direction is called the one axial side or "-Y direction".

[0065] like Figure 1 As shown, the rotating device 100 includes a shaft-shaped body 1 , a housing 2 , a seal 4 , and a seal pressing member 5 .

[0066] like Figure 2 As shown, the position sensor 200 is used to detect the position of a device or the like, and includes a rotating device 100, a slider 6, and a resistor substrate 7. In addition, the position sensor is also called a position measuring instrument.

[0067] (Axis 1)

[0068] The shaft-shaped body 1 has a predetermined axial diameter and a predetermined axial length, and extends from one axial side (-Y direction) to the other axial side (+Y direction). The end of the other axial side of the shaft-shaped body 1 has a flange portion 1a whose diameter is enlarged toward the radial outside (+X direction). A slider 6 is arranged on the flange portion 1a in a manner opposite to the resistor 8.

[0069] The position sensor 200 includes, for example, a slider 6 (brush) that can be rotated and displaced and a resistor substrate 7, wherein the resistor substrate 7 has a resistor 8 with a constant voltage applied between both ends. By sliding the slider 6 on the resistor 8, the rotational displacement of the slider 6 (shaft body 1) is output as a voltage change, and the position of the device or the like is detected based on the output voltage value.

[0070] (Shell 2)

[0071] The housing 2 is formed into a prescribed shape from a resin material. The housing 2 has a cylindrical portion 20 with a shaft hole 2a as a hollow portion, and supports the shaft body 1 in such a way that the shaft body 1 can rotate. The shaft hole 2a extends in the axial direction (Y direction) and is a hole through which the shaft body 1 passes. Both axial sides of the shaft hole 2a are open. The hole peripheral wall 21 of the shaft hole 2a is a peripheral wall from the opening edge of the axial one-side opening portion 21a to the opening edge of the axial other-side opening portion (not shown). A ring-shaped gap 3 is provided between the shaft body 1 passing through the shaft hole 2a and the hole peripheral wall 21 (refer to Figure 6 ). The diameter of the axial one-side opening portion 21a is diameter D_21a.

[0072] Figure 3 is a cross-sectional view of the rotating device according to an embodiment of the present invention, and is a cross-sectional view showing the state before assembling the seal and the seal pressing member. On the hole peripheral wall 21, a thermocompression bonding extension portion 22, a large-diameter hole peripheral wall portion 23, a positioning step portion 24, a medium-diameter hole peripheral wall portion 25, an inclined portion 26, a press-fitted hole peripheral wall portion 27, a seal accommodation step portion 28, and a small-diameter hole peripheral wall portion 29 are sequentially arranged from the end portion in the axial one-side (-Y direction) to the end portion in the axial other-side (+Y direction). The thermocompression bonding extension portion 22 extends radially inward from the end portion in the axial one-side of the large-diameter hole peripheral wall portion 23. The large-diameter hole peripheral wall portion 23 has a prescribed diameter D_23. The medium-diameter hole peripheral wall portion 25 has a prescribed diameter D_25. The small-diameter hole peripheral wall portion 29 has a prescribed diameter D_29.

[0073] The thermocompression bonding extension portion 22 is an annular portion whose diameter is reduced from diameter D_22A (i.e., the diameter is reduced) to diameter D_22B. The diameter D_22A is the same diameter as the diameter D_23 of the large-diameter hole peripheral wall portion 23, and the diameter D_22B is the same diameter as the diameter D_25 of the medium-diameter hole peripheral wall portion 25.

[0074] The diameter D_23 of the large-diameter hole peripheral wall portion 23 is a diameter smaller than the diameter D_21a of the axial one-side opening portion 21a (D_23 < D_21a). The diameter D_25 of the medium-diameter hole peripheral wall portion 25 is a diameter smaller than the diameter D_23 of the large-diameter hole peripheral wall portion 23 (D_25 < D_23). The seal pressing member 5 is loosely fitted with the medium-diameter hole peripheral wall portion 25. The positioning step portion 24 is a step portion whose diameter is reduced from diameter D_24A to diameter D_24B. The diameter D_24A is the same diameter as the diameter D_23 of the large-diameter hole peripheral wall portion 23, and the diameter D_24B is the same diameter as the diameter D_25 of the medium-diameter hole peripheral wall portion 25. The positioning step portion 24 is a step portion for positioning the seal pressing member 5.

[0075] The inclined portion 26 is disposed at a position on the axially other side (+Y direction) than the circumferential wall portion 25 of the middle diameter hole and on the axially one side (-Y direction) than the circumferential wall portion 27 of the press-fitted hole. The inclined portion 26 is an inclined surface that slopes from the end portion on the axially other side of the circumferential wall portion 25 of the middle diameter hole in such a manner that it approaches more radially inward (-X direction) as it approaches from the axially one side (-Y direction) to the axially other side (+Y direction). The front end portion of the inclined surface is continuous with the end portion on the axially one side of the circumferential wall portion 27 of the press-fitted hole. In other words, the inclined portion 26 is reduced in diameter from diameter D_26A to diameter D_26B as it goes from the axially one side (-Y direction) toward the axially other side (+Y direction). The diameter D_26A is the same diameter as the diameter D_25 of the circumferential wall portion 25 of the middle diameter hole, and the diameter D_26B is the same diameter as the diameter D_27 of the circumferential wall portion 27 of the press-fitted hole.

[0076] The circumferential wall portion 27 of the press-fitted hole has a diameter D_27 (D_27 < D_25) smaller than the diameter D_25 of the circumferential wall portion 25 of the middle diameter hole. In addition, the diameter D_27 of the circumferential wall portion 27 of the press-fitted hole is the same diameter (D_27 = D_26B) as the diameter D_26B of the inclined portion 26.

[0077] The circumferential wall portion 29 of the small diameter hole has a diameter (D_29) smaller than the diameter (D_27) of the circumferential wall portion 27 of the press-fitted hole (D_29 < D_27). The diameter D_29 of the circumferential wall portion 29 of the small diameter hole is larger than the diameter D_1 of the shaft body 1 (D_29 > D_1). The step portion 28 for accommodating the seal is a step portion that is reduced in diameter from diameter D_28A to diameter D_28B. The diameter D_28A is the same diameter as the diameter D_27 of the circumferential wall portion 27 of the press-fitted hole, and the diameter D_28B is the same diameter as the diameter D_29 of the circumferential wall portion 29 of the small diameter hole. In addition, the gap between the circumferential wall 21 and the shaft body 1, between the circumferential wall portion 29 of the small diameter hole and the shaft body 1, is defined as gap 3a.

[0078] The housing 2 has a housing portion 2b for housing the slider 6 and the resistance substrate 7 (refer to Figure 2 ). The housing portion 2b is disposed at a position on the axially other side (+Y direction) than the gap 3a (refer to Figure 2 ).

[0079] A seal 4 is disposed between the step portion 28 for accommodating the seal and the end portion on the axially other side of the small diameter portion 53 of the seal pressing member 5 (refer to Figure 7 ) described later.

[0080] (Seal 4)

[0081] The seal 4 is an annular seal having a prescribed inner diameter and a prescribed outer diameter. The cross-sectional shape along the axial direction of the seal 4 is an inverted V shape (refer to Figure 6). The seal 4 is formed of a resin material having elasticity and oil resistance. The seal 4 blocks the gap 3a from one axial side (-Y direction). Thus, foreign matter such as dust can be prevented from entering from one axial side (-Y direction) through the gap 3a to the other axial side (+Y direction).

[0082] (Seal pressing piece 5)

[0083] Figure 4A It is a top view of the seal pressing member according to the embodiment of the present invention. Figure 4B It is a front view of the seal pressing member according to the embodiment of the present invention. Figure 5 2 is a perspective view of a sealing member pressing member according to an embodiment of the present invention. Figure 4A , Figure 4B and Figure 5 As shown, the seal pressing member 5 is located at a position closer to the axial side (-Y direction) than the seal 4 and is connected to the annular gap 3 (refer to Figure 3 ) is a frustoconical cylindrical body. The seal pressing member 5 is a cylindrical body having a hollow portion, and the shaft body 1 (refer to Figure 2 ) passes through the hollow portion.

[0084] The seal clamp 5 is formed of a resin material into a prescribed shape. The seal clamp 5 has a large diameter portion 51, a middle diameter portion 52, a small diameter portion 53 and a press-fit portion 54. The large diameter portion 51, the middle diameter portion 52 and the small diameter portion 53 are arranged in sequence from the end on one axial side toward the end on the other axial side. The large diameter portion 51 has a diameter D_51. The middle diameter portion 52 has a diameter D_52 that is smaller than the diameter D_51. The small diameter portion 53 has a diameter D_53 that is smaller than the diameter D_52. That is, from the end on one axial side toward the end on the other axial side, the diameters of the large diameter portion 51, the middle diameter portion 52 and the small diameter portion 53 become smaller in sequence (D_51>D_52>D_53).

[0085] The press-fit portion 54 has a plurality of convex strips 55 arranged at equal intervals in the circumferential direction at the outer periphery of the small diameter portion 53. In the present embodiment, the four convex strips 55 are arranged at intervals of 90 degrees in the circumferential direction. The convex strips 55 extend from the end position on the other axial side of the middle diameter portion 52 to the position of the axial center of the small diameter portion 53. The convex strips 55 are protruded in a mountain shape from the outer periphery of the small diameter portion 53 to the radial outside (+X direction), and have a semicircular cross-section shape (i.e., a semicircular cross-section shape). In addition, the envelope connected to the outer periphery of each of the four convex strips 55 is a circle with a diameter D_54. The diameter D_54 is larger than the diameter D_53 of the small diameter portion 53 and smaller than the diameter D_52 of the middle diameter portion 52 (D_52>D_54>D_53). When the pressed portion 54 (convex strip portion 55) is not subjected to pressure from the inclined portion 26 or the pressed hole peripheral wall portion 27, the diameter of the circular envelope is maintained at the diameter D_54. When subjected to pressure, the diameter of the circular envelope is reduced to the same diameter as the diameter of the inclined portion 26 or the same diameter as the diameter D_27 of the pressed hole peripheral wall portion 27. Figure 4A The envelope WL is shown in .

[0086] In addition, the diameter D_54 of the envelope is the diameter of the cross-sectional semicircular shape of the portion of the convex stripe 55 excluding the end portion on the other axial side. The diameter of the cross-sectional semicircular shape at the end portion on the other axial side of the convex stripe 55 gradually decreases from the axial one side toward the axial other side. In other words, the diameter of the envelope of the end portion on the other axial side of the press-fit portion 54 (convex stripe 55) decreases from the axial one side toward the axial other side. The diameter of the envelope of the end portion on the other axial side of the press-fit portion 54 (convex stripe 55) is the same diameter as the diameter D_53 of the small diameter portion 53.

[0087] The diameter D_51 of the large diameter portion 51 is substantially the same as the diameter D_23 of the large diameter hole peripheral wall portion 23. The thickness of the large diameter portion 51 is substantially the same as the height (axial length) of the large diameter hole peripheral wall portion 23 to the positioning step portion 24. Thus, the large diameter portion 51 can be fitted with the positioning portion formed by the large diameter hole peripheral wall portion 23 and the positioning step portion 24. At this time, the large diameter portion 51 is covered by the thermocompression extension portion 22 from one axial side (-Y direction). The large diameter portion 51 is thermocompressed on the thermocompression extension portion 22.

[0088] The small-diameter portion 53 extends from the middle-diameter portion 52 toward the other axial side (+Y direction). A seal 4 is disposed between the end portion on the other axial side of the small-diameter portion 53 and the seal housing step portion 28 (in the housing gap). The axial length of the small-diameter portion 53 is set such that the seal 4 is disposed in the housing gap. As described above, the gap 3a is blocked by the seal 4 from the axial one side (-Y direction). That is, as long as the seal pressing member 5 does not move from the axial other side (+Y direction) toward the axial one side (-Y direction), the seal 4 will not fall off from the axial other side (+Y direction) toward the axial one side (-Y direction). If the seal 4 does not fall off, it is possible to prevent foreign matters such as dust from entering the housing portion 2b located on the axial other side (+Y direction) through the gap 3a from the axial one side (-Y direction).

[0089] Next, with reference to Figure 3 , Figure 6 and Figure 7 the assembly sequence of the seal 4 and the seal pressing member 5 will be described. Figure 3 is a cross-sectional view of the rotating device according to an embodiment of the present invention, and is a cross-sectional view showing the state before the seal and the seal pressing member are assembled. In addition, it is assumed that in the state shown in Figure 3 , the shaft body 1 and the housing 2 have been pre-assembled together. In addition, it is assumed that a slider 6 is pre-assembled on the shaft body 1 and a resistor substrate 7 is assembled on the housing 2.

[0090] In the state shown in Figure 3 , first, a predetermined amount of lubricating oil is applied to the seal 4. Next, the seal 4 is placed in the gap 3 between the shaft body 1 and the hole peripheral wall 21. Next, using a jig, the seal 4 is pushed from the axial one side (-Y direction) to a predetermined position on the axial other side (+Y direction) (see Figure 6 ).

[0091] Next, the seal pressing member 5 is placed in the gap 3. Next, the seal pressing member 5 is pushed from the axial one side (-Y direction) toward the axial other side (+Y direction). Thereby, the large-diameter portion 51 can be fitted into the positioning portion (the portion composed of the large-diameter hole peripheral wall portion 23 and the positioning step portion 24). In addition, the large-diameter portion 51 fitted into the positioning portion can be covered from the axial one side (-Y direction) by the thermocompression bonding extension portion 22 (see Figure 7 ).

[0092] Next, the large-diameter portion 51 is thermocompression bonded to the thermocompression bonding extension portion 22. Thereby, the seal pressing member 5 is prevented from moving from the axial other side (+Y direction) toward the axial one side (-Y direction). Since the seal pressing member 5 does not move toward the axial one side (-Y direction), the seal 4 can be prevented from falling off from the predetermined position.

[0093] Next, the relationship between the seal pressing member 5 and other components when the seal pressing member 5 is pushed from one axial side (-Y direction) to the other axial side (+Y direction) is described. First, the relationship between the seal pressing member 5 and the seal 4 is described. For example, when the seal 4 stays at a position closer to one axial side than the specified position, the seal 4 is pushed to the specified position by the seal pressing member 5 moving from one axial side (-Y direction) to the other axial side (+Y direction).

[0094] Next, the relationship between the seal pressing member 5 and the hole peripheral wall 21 is described. When the seal pressing member 5 is inserted into the shaft hole 2a, first, the end of the press-in portion 54 (the convex strip portion 55) on the other axial side abuts against the inclined portion 26. At this time, since the diameter of the envelope of the end of the press-in portion 54 (the convex strip portion 55) on the other axial side decreases from one axial side toward the other axial side, the four convex strip portions 55 reliably abut against their respective positions in the axial direction of the inclined portion 26. As a result, the forces received by each of the four convex strip portions 55 from the inclined portion 26 are balanced, and the position or inclination of the seal pressing member 5 relative to the shaft hole 2a can be easily corrected, so that the seal pressing member 5 can be easily inserted into the shaft hole 2a.

[0095] Next, since the inclined portion 26 is reduced in diameter from the diameter D_26A which is the same diameter as the diameter D_25 of the middle-diameter hole peripheral wall portion 25 to the diameter D_26B which is the same diameter as the diameter D_27 of the hole peripheral wall portion 27 to be pressed, if the seal pressing member 5 is further inserted into the axial hole 2a, the pressing portion 54 (the convex stripe portion 55) is reduced in diameter from the predetermined diameter D_54 to the same diameter as the inclined portion 26 as it moves toward the other side in the axial direction, and finally to the same diameter as the diameter D_27 of the hole peripheral wall portion 27 to be pressed. Thus, the pressing portion 54 (the convex stripe portion 55) can be embedded in the hole peripheral wall portion 27 to be pressed. And, the pressing portion 54 (the convex stripe portion 55) of the seal pressing member 5 is kept pressed into the hole peripheral wall portion 27 by the restoring force to restore from the diameter D_27 to the diameter D_54. Figure 7 The dotted line in the figure indicates the press-fit portion 54 (convex strip portion 55) when the diameter D_54 is restored. When the seal pressing member 5 is to be moved from the other axial side (+Y direction) to the one axial side (-Y direction), the seal pressing member 5 is not easy to move to the one axial side (-Y direction) because of the large friction force from the pressed hole peripheral wall portion 27, thereby preventing the seal 4 from falling off from the specified position. Figure 7 The seal 4 is shown arranged at a predetermined position.

[0096] The rotating device 100 in the above-mentioned embodiment comprises: an axial body 1 extending in the axial direction; a housing 2 having an axial hole 2a, for supporting the axial body 1 in a manner that enables the axial body 1 passing through the axial hole 2a to rotate; a seal 4, for blocking the gap 3 between the hole circumferential wall 21 of the axial hole 2a and the axial body 1 from one axial side; and a seal pressing member 5, which is engaged with the gap 3 at a position closer to one axial side than the seal 4, so as to prevent the seal 4 from moving from the other axial side to one axial side, the hole circumferential wall 21 having a pressed-in hole circumferential wall portion 27, and the seal pressing member 5 is pressed into the pressed-in hole circumferential wall portion 27.

[0097] According to the above structure, since the seal pressing member 5 is pressed into the peripheral wall portion 27 of the pressed hole, the seal pressing member 5 is not easy to move from the other axial side (+Y direction) to the one axial side (-Y direction). As long as the seal pressing member 5 does not move to one axial side, the seal 4 arranged at a position closer to the other axial side than the seal pressing member 5 can be prevented from falling off from the other axial side (+Y direction) to the one axial side (-Y direction).

[0098] In the rotating device 100 of the above-mentioned embodiment, the seal pressing member 5 includes: a press-fitting portion 54, which is press-fitted into the press-fitted hole peripheral wall portion 27; a large diameter portion 51, which is arranged at a position closer to one side in the axial direction than the press-fitting portion 54 and has a larger diameter than the press-fitting portion 54; and a small diameter portion 53, which is arranged at a position closer to the other side in the axial direction than the press-fitting portion 54 and has a smaller diameter than the press-fitting portion 54. Thus, the seal pressing member 5 gradually decreases in diameter from one side in the axial direction to the other side in the axial direction, and thus the seal pressing member 5 can be easily inserted into the shaft hole 2a.

[0099] In the rotating device 100 of the above embodiment, the hole peripheral wall 21 includes: a small diameter hole peripheral wall portion 29, which is arranged at a position closer to the other side of the axial direction than the hole peripheral wall portion 27 to be pressed, and has a smaller diameter than the diameter of the hole peripheral wall portion to be pressed; a medium diameter hole peripheral wall portion 25, which is arranged at a position closer to one side of the axial direction than the hole peripheral wall portion 27 to be pressed, and has a larger diameter than the diameter of the hole peripheral wall portion 27 to be pressed, and the seal pressing member 5 is loosely fitted in the medium diameter hole peripheral wall portion 25; and a large diameter hole peripheral wall portion 23, which is arranged at a position closer to one side of the axial direction than the medium diameter hole peripheral wall portion 25, and has a larger diameter than the diameter of the medium diameter hole peripheral wall portion. As a result, the hole peripheral wall 21 becomes a conical hole that gradually decreases in diameter from one axial side to the other axial side, so that the seal pressing member 5 that gradually decreases in diameter from one axial side to the other axial side can be easily inserted into the hole.

[0100] In the rotating device 100 of the above-mentioned embodiment, the hole peripheral wall 21 has an inclined portion 26, and the inclined portion 26 is arranged at a position closer to the other axial side than the middle diameter hole peripheral wall portion 25 and closer to one axial side than the pressed hole peripheral wall portion 27, and the inclined portion 26 is inclined from the middle diameter hole peripheral wall portion 25 in a manner that the closer it is from the one axial side to the other axial side, the closer it is to the direction of the gap side, that is, the radial inner side. As a result, the press-fit portion 54 reliably contacts the inclined portion 26, and the force received from the inclined portion 26 is balanced, so that the position or inclination of the seal pressing member 5 relative to the shaft hole 2a can be easily corrected, and therefore, the seal pressing member 5 can be easily inserted into the shaft hole 2a.

[0101] In the rotating device 100 of the above-mentioned embodiment, the hole peripheral wall 21 has a heat-pressing extension portion 22, which extends radially inward from the end portion of the large-diameter hole peripheral wall portion 23 on one axial side, and the large-diameter portion 51 is heat-pressed on the heat-pressing extension portion 22. As a result, the movement of the seal pressing member 5 in the axial direction is restricted, so that the seal 4 arranged at a position closer to the other axial side than the seal pressing member 5 can be reliably prevented from falling off from the other axial side to the one axial side.

[0102] In the rotating device 100 of the above-mentioned embodiment, the hole peripheral wall 21 has a seal accommodating step portion 28, which extends radially inward from the end portion on the other axial side pressed into the hole peripheral wall portion 27, and the seal 4 is arranged in the gap between the seal accommodating step portion and the end portion on the other axial side of the small diameter portion 53. As a result, the movement of the seal 4 from a predetermined position is restricted, so that the gap 3a is kept blocked by the seal 4, and foreign matter such as dust can be prevented from entering a portion arranged on the other axial side of the gap 3a.

[0103] In addition, in the position sensor 200 of the above embodiment, the rotating device 100, the slider 6 mounted on the shaft-shaped body, and the resistor substrate 7 having the resistor 8 are provided, and the slider 6 slides on the resistor 8 in response to the rotation of the shaft-shaped body 1, and the housing 2 has a housing portion 2b for housing the slider 6 and the resistor substrate 7, and the housing portion 2b is arranged at a position closer to the other side in the axial direction than the gap 3a between the shaft-shaped body 1 and the small-diameter hole peripheral wall portion 29. Thus, the gap 3a is kept blocked by the seal 4, and foreign matter such as dust can be prevented from entering the housing portion 2b arranged at a position closer to the other side in the axial direction than the gap 3a.

[0104] The above-mentioned embodiments are merely examples of specific implementations of the present invention, and the technical scope of the present invention should not be limited by these embodiments. That is, the present invention can be implemented in various forms without departing from the gist or main features thereof.

[0105] Industrial Applicability

[0106] The present invention is suitable for use in equipment equipped with a rotating device that requires a seal to be prevented from falling off.

Claims

1. A rotating device, characterized in that: have: Axial body, extending in the axial direction; A housing having an axial hole for supporting the axial body in a manner that allows the axial body passing through the axial hole to rotate; A sealing member, which blocks the gap between the peripheral wall of the shaft hole and the shaft-shaped body from one axial side; as well as The seal pressing member is engaged with the gap at a position closer to one side in the axial direction than the seal, so as to prevent the seal from moving from the other side in the axial direction to the one side in the axial direction. The hole peripheral wall has a pressed hole peripheral wall portion, and the sealing member pressing member is pressed into the pressed hole peripheral wall portion.

2. The rotating device according to claim 1, wherein: The sealing member pressing member comprises: A pressing portion, pressed into the peripheral wall of the pressed hole; A large diameter portion is arranged at a position closer to one side in the axial direction than the press-fit portion and has a diameter larger than that of the press-fit portion; as well as The small diameter portion is arranged on the other side in the axial direction relative to the press-fit portion and has a diameter smaller than that of the press-fit portion.

3. The rotating device according to claim 2, wherein: The hole peripheral wall has: The small-diameter hole peripheral wall portion is arranged at a position closer to the other axial side than the pressed-in hole peripheral wall portion and has a diameter smaller than the diameter of the pressed-in hole peripheral wall portion; The middle diameter hole peripheral wall portion is arranged at a position closer to one side of the axial direction than the pressed hole peripheral wall portion and has a diameter larger than the diameter of the pressed hole peripheral wall portion, and the sealing member pressing member is loosely fitted in the middle diameter hole peripheral wall portion; as well as The large-diameter hole peripheral wall portion is arranged at a position closer to one side in the axial direction than the medium-diameter hole peripheral wall portion and has a diameter larger than that of the medium-diameter hole peripheral wall portion.

4. The rotating device according to claim 3, wherein: The hole circumferential wall has an inclined portion, which is arranged at a position closer to the other axial side than the middle diameter hole circumferential wall portion and closer to one axial side than the pressed hole circumferential wall portion, and the inclined portion is inclined from the middle diameter hole circumferential wall portion in a manner that the closer it is from one axial side to the other axial side, the closer it is to the direction of the gap side, that is, the radial inner side.

5. The rotating device according to claim 3, wherein: The hole peripheral wall has a heat-pressing extension portion, and the heat-pressing extension portion extends from an axial end of the large-diameter hole peripheral wall portion toward the gap side, that is, radially inward. The large diameter portion is thermally compressed onto the thermal compression extending portion.

6. The rotating device according to claim 4, wherein: The hole peripheral wall has a seal accommodating step portion, and the seal accommodating step portion extends from the other axial end of the hole peripheral wall portion pressed into the hole peripheral wall portion toward the radial inner side. The seal is arranged in a gap between the seal accommodating step portion and the other axial end portion of the small diameter portion.

7. A position sensor, characterized in that: have: The rotating device according to any one of claims 3 to 5; A slider mounted on the shaft-shaped body; and The resistor substrate has a resistor body, and the slider slides on the resistor body in response to the rotation of the shaft body. The housing has a receiving portion for receiving the slider and the resistor substrate. The accommodation portion is arranged at a position closer to the other side in the axial direction than the gap between the shaft-shaped body and the peripheral wall portion of the small-diameter hole.

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