Steering Wheel

Abstract

To provide a steering wheel that is able to obtain a natural grip of a rim portion by a driver and satisfactory turning operation while securing satisfactory front visibility of the driver in a steering neutral state.SOLUTION: A steering wheel includes a non-annular rim portion 11 and a spoke portion 12. The spoke portion 12 includes an inflection portion 16, an upper inclined surface 17, and a lower inclined surface 18. The inflection portion 16 extends along an extending direction of the spoke portion 12 and faces a driver side. The upper inclined surface 17 extends upward from the inflection portion 16 while curving toward the vehicle front side. The lower inclined surface 18 extends downward from the inflection portion 16 while curving toward the vehicle front side. A curvature radius of a portion of the upper inclined surface 17 which curves toward the vehicle front side is set to be larger than a curvature radius of a portion of the lower inclined surface 18 which curves toward the vehicle front side. The rim portion 11 includes a projection portion 15 projecting upward from a position adjacent to the upper inclined surface 17 in a steering neutral state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a steering wheel for a vehicle. [Background technology]

[0002] A steering wheel for a general vehicle includes a hub portion supported by a steering shaft, an annular rim portion gripped by a driver, and spokes connecting the hub portion and the rim portion. In recent years, steering wheels with non-annular rim portions have been developed from the viewpoint of ensuring forward visibility (for example, see Patent Document 1).

[0003] In some steering wheels of this type, the rim is formed in a substantially semicircular or horizontally elongated substantially semi-elliptical shape, and there is no upper region of the rim in the neutral steering state. In this steering wheel, the spokes extend in the direction that corresponds to the width of the vehicle in the neutral steering state, and the ends of the spokes in the extending direction are connected to the upper end regions on the left and right of the rim. In the case of this steering wheel, the rim portion does not have an upper area (the part located above the hub portion) when the steering is neutral, so the rim portion does not obstruct the driver's view when looking forward, ensuring the driver's forward visibility. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-69717 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned conventional steering device, when the driver grips the upper parts of the left and right side edges of the rim portion in a neutral steering state, the spoke portion is located in a position where the driver's thumbs would be wrapped around it, so the driver is often forced to grip the spoke portion with his or her fingers in an unnatural position.

[0006] In addition, in the above-mentioned conventional steering device, in the neutral steering state, the rim does not exist above the intersection area of ​​the rim with the left and right spoke parts. Therefore, when the driver grips the rim near the intersection area of ​​the rim with the left and right spoke parts to turn the rim, the driver is forced to turn carefully so as not to cause the grip part to shift in position. In other words, when the driver turns the rim, the driver's hand, which is trying to push the rim upward, tends to shift from the end of the rim in the pushing direction, and the driver is forced to turn carefully so as not to cause this shift in the pushing direction.

[0007] Therefore, the present invention aims to provide a steering wheel that allows the driver to grip the rim part naturally and comfortably and to perform good turning operation while ensuring good forward visibility for the driver in the neutral steering state, thereby further improving traffic safety and contributing to the development of a sustainable transportation system. [Means for solving the problem]

[0008] A steering wheel according to one aspect of the present invention includes a non-annular rim portion (e.g., rim portion 11 in the embodiment) whose upper region is interrupted in a neutral steering state, and spoke portions (e.g., spoke portions 12 in the embodiment) that extend along a direction that corresponds to the vehicle width direction in the neutral steering state and have their outer ends in the vehicle width direction connected to the rim portion, and the spoke portions each include an inflection portion (e.g., inflection portion 16 in the embodiment) that extends along the extension direction of the spoke portion and faces the driver, and a curved portion (e.g., inflection portion 17 in the embodiment) that curves in a direction that corresponds to the upper side in the neutral steering state. The steering wheel has an upper slope (e.g., upper slope 17 in the embodiment) that curves and extends toward both front sides, and a lower slope (e.g., lower slope 18 in the embodiment) that curves and extends toward the front side of the vehicle from the inflection portion toward the side that is downward in a neutral steering state, the upper slope has a radius of curvature set to be larger than the radius of curvature of the lower slope that is curved toward the front side of the vehicle, and the rim portion has a protruding portion (e.g., protruding portion 15 in the embodiment) that protrudes toward the upward side from a position adjacent to the upper slope in a neutral steering state. The width of the protruding portion in the vehicle width direction in a neutral steering state is increased toward the end portion in the protruding direction.It is characterized by:

[0009] In the steering wheel having the above configuration, when the steering is in a neutral state, the interrupted portion of the upper part of the rim is positioned in front of the driver's line of sight, so that the steering wheel does not block the driver's line of sight forward, improving the driver's visibility. In addition, the driver can press the area from the base of the thumb to the first joint against the upper slope of the spoke, and in that state, grip the outer part of the rim that intersects with the spoke with the other fingers, which allows the driver to stably grip the steering wheel in a natural position without applying excessive force to the hand. In addition, when the driver grips the steering wheel with the area from the base of the thumb to the vicinity of the first joint pressed against the upper slope as described above, the protrusion is located directly above the gripped area. Therefore, when the driver turns the rim in one direction from the neutral steering state in this state, the hand pushing upward is less likely to shift in position in the direction of the turning operation. In this case, when the part of the thumb extending from the base to the first joint is pressed against the upper slope of the spoke part, and the other fingers grip the outer part of the intersection area of ​​the rim part with the spoke part in this state, the side of the protrusion with the increased width is positioned above the base of the thumb and the other fingers. In this case, the base end side of the protrusion is relatively narrow in width, so that the grip of the rim part with the thumb pressed against the upper slope is not hindered. In addition, since the width of the protrusion increases toward the protrusion end side, when the driver turns the steering wheel, the protrusion can more reliably prevent the position of the driver's hand that is pushing the steering wheel upward from shifting.

[0010] The upper slope may include a main region (e.g., main region 17a in the embodiment) that extends linearly along the extension direction of the spoke portion in a neutral steering state, and a connection region (e.g., connection region 17b in the embodiment) that curves upward from the end of the main region on the rim portion side in a neutral steering state and continues to the protrusion.

[0011] In this case, the driver can press the area from the base of the thumb to the first joint against the main region while simultaneously pressing the inner side of the thumb against the curved joint region, so that a wide area of ​​the driver's thumb can stably contact the upper slope, improving the stability of the grip on the steering wheel and improving the grip feeling for the driver.

[0012] The protrusion may be provided with a flat inner inclined surface (e.g., inner inclined surface 19 in the embodiment) at least a portion of which faces toward the driver and toward the inside in the vehicle width direction in a region that is on the inside in the vehicle width direction when the steering is neutral.

[0013] In this case, when the driver directly grips the outer circumferential surface of the protruding portion, the driver can press the ball or base of the thumb against the flat inner inclined surface. Therefore, when the driver directly grips the protruding portion, the driver can stably grip the protruding portion. In addition, by pressing the ball of the thumb against the inner inclined surface, the driver can use the force of the thumb to firmly resist the gripping portion of the driver's hand from slipping out in the direction of the turning operation when turning the rim portion in one direction.

[0014] The inner inclined surface is preferably continuous with the curved articulation region of the spoke portion.

[0015] In this case, when the rider moves the gripping position of the rim portion between the outer peripheral position of the protrusion and the extension position of the spoke portion of the rim portion (intersection area), the rider can move the gripping position smoothly and without getting caught by simply shifting the position where the thumb is pressed between the inner inclined surface and the upper inclined surface (connection area).

[0016] It is desirable that the surface of the protruding portion that faces upward in a neutral steering state (for example, the upper end surface 15u in the embodiment) be a flat surface.

[0017] In this case, when the driver directly grips the protruding portion, the driver can stably place a part of the index finger or middle finger on the flat surface at the top of the protruding portion. By placing a part of the index finger or middle finger on the flat surface at the top of the protruding portion in this way, the finger grip on the protruding portion is improved. Therefore, when this configuration is adopted, the gripping state when gripping the protruding portion is stable.

[0018] A part of the outer circumferential surface of the protrusion may bulge outward from a turning path of the outer circumferential surface of the rim portion that is positioned on an extension of the extending direction of the spoke portion (for example, turning path To in the embodiment).

[0019] In this case, when the part of the thumb from the base to the vicinity of the first joint is pressed against the upper slope of the spoke part, and in this state the outer part of the rim part at the intersection with the spoke part is gripped with the other fingers, the part of the outer circumferential surface of the protrusion that bulges outward from the turning trajectory of the outer circumferential surface of the rim part is positioned above the other fingers. Therefore, when the driver turns the steering wheel in this state, the fingers other than the thumb of the driver who is pushing upwards get caught on the outer bulging part of the outer circumferential surface of the protrusion, preventing the gripping position from shifting. When the rider presses the area from the base of the thumb to the vicinity of the first joint against the upper slope of the spoke part to grip the rim part, the gripping position of the thumb is fixed facing diagonally upward, so the fingers other than the thumb are positioned below the outwardly bulging part of the outer periphery of the protrusion. Therefore, the rider does not grip the outwardly bulging part of the outer periphery of the protrusion with an unnatural wrist position, and does not feel uncomfortable when gripping.

[0020] A portion of the outer peripheral surface of the protrusion may bulge inwardly from a turning orbit (e.g., turning orbit Ti in the embodiment) of the inner peripheral surface of the rim portion that is positioned on an extension of the extension direction of the spoke portion.

[0021] In this case, when the part of the thumb extending from the base to the vicinity of the first joint is pressed against the upper slope of the spoke part, and in this state the rim part outside the intersection area with the spoke part is gripped with the other fingers, a part of the outer circumferential surface of the protrusion that bulges inward from the turning trajectory of the inner circumferential surface of the rim part is located above the base of the thumb. Therefore, when the driver turns the steering wheel in this state, the base of the thumb of the driver who is pushing it upward gets caught on the inner bulging part of the outer circumferential surface of the protrusion, preventing the gripping position from shifting. Effect of the Invention

[0024] In the steering wheel according to the present invention, the spoke portion has the upper inclined surface as described above, and the non-annular rim portion has a protruding portion that protrudes upward from a position adjacent to the upper inclined surface in the neutral steering state. Therefore, when the steering wheel according to the present invention is adopted, the driver can grip the rim portion in a natural and easy manner and can perform a good turning operation while ensuring good forward visibility for the driver in the neutral steering state. [Brief description of the drawings]

[0025] [Figure 1] FIG. 2 is a front view of a steering wheel according to an embodiment disposed in front of a driver's seat. [Diagram 2] FIG. 2 is a front view of the steering wheel according to the embodiment. [Diagram 3] FIG. 2 is a front view showing a gripping state of the steering wheel according to the embodiment. [Figure 4] FIG. 11 is a front view showing another gripping state of the steering wheel of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, in the appropriate places of the drawings, an arrow FR pointing forward of the vehicle, an arrow UP pointing upward of the vehicle, and an arrow LH pointing to the left side of the vehicle are shown.

[0027] <Steering wheel configuration> FIG. 1 is a front view of a steering wheel 1 of this embodiment arranged in front of the driver's seat of a vehicle. The steering wheel 1 comprises a hub portion 10 supported by a steering shaft (not shown), a non-annular rim portion 11 that is gripped by the driver, and three spoke portions 12 that connect the hub portion 10 and the rim portion 11. An instrument panel 2 is disposed on the vehicle front side of the steering wheel 1. On the instrument panel 2, vehicle information such as vehicle speed and display portions 2a to 2c that display this information are disposed facing the driver (toward the rear of the vehicle).

[0028] The hub portion 10 is disposed so as to face the driver seated in the driver's seat. In this embodiment, the hub portion 10 is formed in a shape that is substantially elliptical and horizontally long when viewed from the front when the steering is in a neutral state. A horn and an airbag device (not shown) are built into the hub portion 10. In this specification, the term "neutral steering state" refers to the steering state (rotational position of the steering wheel 1) when the steered wheels of the vehicle are directed in a straight-ahead direction. In the following, terms such as "up," "down," and "vehicle width direction" related to the steering wheel 1 refer to the directions when the steering wheel 1 is in the neutral steering state, unless otherwise specified.

[0029] The rim portion 11 has a non-annular shape with an interrupted area at the top in the neutral steering state. The rim portion 11 has a lower edge portion 11a extending along the vehicle width direction below the hub portion 10, and a pair of side edge portions 11b extending upward from both ends of the lower edge portion 11a in the vehicle width direction. Both ends of the lower edge portion 11a are curved upward in an arc shape and continue to the lower ends of each side edge portion 11b.

[0030] The spoke portion 12 comprises a pair of side spoke portions 12s extending from the hub portion 10 in the vehicle width direction in the neutral steering state, and a lower spoke portion 12l extending downward from the hub portion 10 in the neutral steering state. The side spoke portions 12s extend from the side ends of the hub portion 10 toward the outside in the vehicle width direction, tilting slightly downward. The extending ends of each side spoke portion 12s are connected to the side edge portion 11b of the rim portion 11.

[0031] Here, each side edge portion 11b of the rim portion 11 comprises an intersection region 13 that intersects with the extending ends of the side spoke portions 12s, a lower extension portion 14 that extends downward from the intersection region 13 and has its lower end connected to the lower edge portion 11a, and a protrusion 15 that protrudes upward from the intersection region 13. The detailed shape of the side edge portions 11b will be described in detail later, but the overall shape of the side edge portions 11b is generally formed in a substantially arc shape when viewed from the front.

[0032] Each side spoke portion 12s includes an inflection portion 16 that extends along the extension direction of the side spoke portion 12s and faces the driver side (rear side of the vehicle), an upper slope 17 that curves upward from the inflection portion 16 toward the front side of the vehicle, and a lower slope 18 that curves downward from the inflection portion 16 toward the front side of the vehicle. The inflection portion 16 is the portion that bulges most toward the driver side (rear side of the vehicle) in a cross section that intersects with the extension direction of the side spoke portion 12s. The portion of the inflection portion 16 that bulges most toward the driver side (rear side of the vehicle) extends along the extension direction of the side spoke portion 12s and is continuous with the rear surface 13r of the intersection region 13 of the rim portion 11. In this embodiment, the inflection portion 16 is in a band shape having a certain vertical width, but may be in a linear shape having almost no vertical width.

[0033] The upper slope 17 of the side spoke portion 12s is set so that the radius of curvature of the portion curved toward the front of the vehicle is larger than the radius of curvature of the lower slope 18 of the portion curved toward the front of the vehicle. The upper slope 17 includes a main region 17a that extends linearly along the extension direction of the side spoke portion 12s in a front view, and a connection region 17b that extends from the end of the main region 17a on the rim portion 11 side to the upwardly concave curve. The main region 17a is curved toward the front of the vehicle in a portion close to the inflection portion 16, but the portion forward of the curved portion is formed substantially flat. The radius of curvature of the arc of the connection region 17b in a front view gradually increases from the back side to the front side in the depth direction (from the front side to the rear side of the vehicle).

[0034] Of the side edges 11b of the rim portion 11, the protruding portion 15 protruding upward from the intersection region 13 has a width in the vehicle width direction that gradually increases toward the end (upper end) in the protruding direction. In particular, the inner end 15ie, which is the inner end in the vehicle width direction of the protruding portion 15, is inclined at a substantially constant angle inward in the vehicle width direction from the connecting portion with the intersection region 13 upward. In other words, the inner end 15ie of the protruding portion 15 protrudes inward in the vehicle width direction so that the protruding width gradually increases toward the upper side.

[0035] Each protrusion 15 protrudes upward from a position adjacent to the connection region 17b of the upper slope 17 of the side spoke portion 12s. The connection region 17b of the upper slope 17 curves upward from the end of the main region 17a of the upper slope 17 on the rim portion 11 side and continues to the protrusion 15. The upper end surface 15u of each protrusion 15 (the surface facing upward in a neutral steering state) is a substantially horizontal flat surface.

[0036] Figure 2 is a front view of the steering wheel 1, with the turning trajectory To of the outer peripheral surface (the outer end face in the vehicle width direction) of the intersection region 13 of the rim portion 11 and the turning trajectory Ti of the inner peripheral surface (the outer end face in the vehicle width direction) of the intersection region 13 of the rim portion 11 added by virtual lines. 2, a portion of the outer end 15oe of each of the protrusions 15 protruding upward from each of the left and right intersection regions 13 bulges outward from the turning path To of the outer circumferential surface of the intersection region 13 of the rim portion 11. Also, a portion of the inner end 15ie of each of the left and right protrusions 15 bulges inward from the turning path Ti of the inner circumferential surface of the intersection region 13 of the rim portion 11.

[0037] A flat inner inclined surface 19 facing the driver (rear side of the vehicle) and toward the inside in the vehicle width direction is formed in the inner region in the vehicle width direction of each protrusion 15. The inner inclined surface 19 smoothly continues to the upper end of the curved connection region 17b of the upper inclined surface 17 of the spoke portion 12.

[0038] Additionally, each rear surface 13r of the left and right intersection regions 13 of the rim portion 11 is formed to be approximately flush with the rear surface of the inflection portion 16 of the adjacent spoke portion 12. In contrast, the rear surfaces 15r of the left and right protrusions 15 of the rim portion 11 are inclined upward from the rear surfaces 13r of the intersection region 13 towards the rear of the vehicle. Additionally, the front surfaces (not shown) of the left and right protrusions 15 of the rim portion 11 are inclined at approximately the same angle in the same direction as the rear surfaces 15r. Further, rear surfaces 14r of the lower extension portions 14 extending downward from the left and right intersection regions 13 are inclined downward from the rear surfaces 13r of the intersection regions 13 toward the rear of the vehicle.

[0039] <Holding the steering wheel> A driver seated in the driver's seat can grasp the steering wheel 1 in the following manner.

[0040] (1) Gripping form 1 3 is a front view showing a state in which a driver grips the steering wheel 1 in gripping form 1. In the figure, symbols Hl and Hr represent the driver's left and right hands, symbol Th represents the thumb, and symbol Fi represents fingers other than the thumb Th, such as the index finger and middle finger. In this gripping form 1, the driver presses the pads and the vicinity of the first joints of the thumbs Th of the left and right hands Hl, Hr against the main region 17a and the connection region 17b of the upper slope 17 of the spoke part 12, and in this state grips the outside of the intersection region 13 of the rim part 11 with the remaining fingers Fi. At this time, the thumbs Th of the left and right hands Hl, Hr face upward while inclining inward in the vehicle width direction, and the inner surface of the thumb Th abuts against the connection region 17b of the upper slope 17. At this time, the fingers Fi other than the thumbs Th of the left and right hands Hl, Hr grip the intersection region 13 directly below the protrusion 15.

[0041] (2) Gripping form 2 FIG. 4 is a front view showing a state in which a driver grips the steering wheel 1 in the gripping mode 2. As shown in FIG. In this gripping form 2, the driver directly grips the outer circumferential surfaces of the left and right protrusions 15 with the thumbs Th and the fingers Fi other than the thumbs Th of the left and right hands Hl, Hr. At this time, the driver can press down the flat inner inclined surface 19 with the pads or bases of the thumbs Th of the left and right hands Hl, Hr. Also, at this time, parts of the index fingers and middle fingers of the left and right hands Hl, Hr can be placed on the flat upper end surfaces 15u of the left and right protrusions 15. Note that parts of the thumbs Th of the left and right hands Hl, Hr near their bases can also be placed on the connection region 17b or main region 17a of the upper inclined surface 17 of the spoke portion 12.

[0042] <Effects of the embodiment> As described above, in the steering wheel 1 of this embodiment, the region of the rim portion 11 that is the upper part in the neutral steering state is discontinued. Therefore, the rim portion 11 does not block the driver's line of sight forward. Therefore, when the steering wheel 1 of this embodiment is adopted, the driver can clearly see the display portions 2a to 2c on the instrument panel 2 and the area outside the vehicle in front.

[0043] In addition, in the steering wheel 1 of this embodiment, the radius of curvature of the curved portion of the upper slope 17 of the side spoke portion 12s (spoke portion 12) is set to be larger than the radius of curvature of the curved portion of the lower slope 18. The left and right protrusions 15 of the rim portion 11 protrude upward from positions adjacent to the upper slope 17 (connection region 17b). For this reason, the driver can press the portion of the thumb Th of the hand Hl, Hr from the base to the vicinity of the first joint against the upper slope 17 of the side spoke portion 12s, and in this state, grip the outer portion of the intersection region 13 with the side spoke portion 12s of the rim portion 11 with the other fingers Fi (grip form 1). Therefore, when the steering wheel 1 of this embodiment is employed, the driver can stably grip the rim portion 11 in a natural position without applying excessive force to the hands Hl and Hr.

[0044] In addition, when the driver grips the steering wheel 1 of this embodiment with the part of the thumb Th from the base to the vicinity of the first joint pressed against the upper slope 17 as described above, the protrusion 15 is located directly above the gripped part. Therefore, when the driver turns the rim part 11 in one direction from the neutral steering state in this state, the hand Hl or Hr pushing it upward is less likely to shift position in the direction of the turning operation. Therefore, when the steering wheel 1 of this embodiment is adopted, the driver can have good forward visibility in the neutral steering state, while being able to grip the rim portion 11 in a natural and relaxed manner and to perform good turning operations.

[0045] Furthermore, in the steering wheel 1 of this embodiment, the upper slope 17 of the side spoke portion 12s has a main region 17a that extends linearly along the extension direction of the side spoke portion 12s, and a connection region 17b that curves upward from the end of the main region 17a on the rim portion 11 side and continues to the protrusion 15. Therefore, while the driver presses the part of the thumb Th from the base to the vicinity of the first joint against the main region 17a of the upper slope 17, the driver can simultaneously press the inner side of the thumb Th continuously against the curved connection region 17b. As a result, a wide area of ​​the driver's thumb Th comes into stable contact with the upper slope 17. Therefore, when the steering wheel 1 of this embodiment is adopted, the stability of gripping the steering wheel 1 is improved, and the driver's gripping feeling is also improved.

[0046] In addition, the steering wheel 1 of this embodiment is provided with a flat inner inclined surface 19, at least a part of which faces the driver side and the inside in the vehicle width direction, in an area that is the inside of each protrusion in the vehicle width direction. Therefore, when the driver directly grips the outer circumferential surface of the protrusion 15, the driver can press the ball or base of the thumb Th against the flat inner inclined surface 19. As a result, when the driver directly grips the protrusion 15 (gripping form 2), the driver can stably grip the protrusion 15. In addition, by pressing the ball of the thumb Th against the inner inclined surface 19, the driver can firmly resist the driver's hand moving in the direction of the turning operation when turning the rim portion 11 in one direction by using the force of the thumb Th.

[0047] In particular, in the steering wheel 1 of this embodiment, the inner end 15ie of the protrusion 15 protrudes upward toward the inside in the vehicle width direction as shown in Figures 1 and 2. Therefore, when turning the rim portion 11 in one direction, the driver's hand can be more reliably prevented from moving in the turning operation direction by the protruding portion of the inner end 15ie that is caught by the thumb Th.

[0048] In addition, in the steering wheel 1 of this embodiment, the inner inclined surface 19 of the protrusion 15 smoothly continues to the curved connection region 17b of the upper inclined surface 17 of the side spoke portion 12s. Therefore, when the driver moves the grip position of the rim portion 11 between the outer peripheral position of the protrusion 15 and the outer position of the intersection region 13, the grip position can be moved smoothly without getting caught. In other words, when the grip position of the rim portion 11 is moved between the outer peripheral position of the protrusion 15 and the outer position of the intersection region 13, it is sufficient to only slightly shift the pressing position of the thumb Th between the inner inclined surface 19 and the upper inclined surface 17 (connection region 17b).

[0049] In addition, in the steering wheel 1 of this embodiment, the upper end surface 15u of the protruding portion 15 is a flat surface. Therefore, when the driver directly grips the protruding portion 15, the driver can stably place a part of the index finger or middle finger on the flat upper end surface 15u of the protruding portion 15. When the driver places a part of the index finger or middle finger on the flat upper end surface 15u of the protruding portion 15 in this manner, the finger grip on the protruding portion 15 is good. Therefore, when the steering wheel 1 of this embodiment is employed, the gripping state can be stabilized when the protruding portion 15 is directly gripped.

[0050] Furthermore, in the steering wheel 1 of this embodiment, a part (outer end 15oe) of the outer peripheral surface of the protrusion 15 bulges outward from the turning path To of the outer peripheral surface of the intersection region 13 of the rim portion 11. Therefore, when the driver grips the outer part of the intersection region 13 of the rim portion 11, the outer end 15oe of the protrusion 15, which bulges outward from the turning path To of the outer peripheral surface of the intersection region 13, is positioned above the fingers (index finger) other than the thumb Th. Therefore, when the driver turns the steering wheel 1 in this state, the fingers other than the thumb Th of the driver who is pushing it upward get caught on the outer end 15oe of the protrusion 15, preventing the driver's grip position from shifting.

[0051] If the driver places the thumb Th on the inside side of the base of the protrusion 15 and grips the outer end 15oe of the protrusion 15 with the other fingers in this state, the driver will grip the rim portion 11 with an unnatural wrist posture. However, in the steering wheel 1 of this embodiment, the driver presses the part of the thumb Th from the base to the vicinity of the first joint against the upper slope 17 of the side spoke portion 12s to grip the rim portion 11, so that the gripping position of the thumb Th is fixed facing inward and diagonally upward. As a result, the fingers other than the thumb Th of the driver will naturally grip a position lower than the protrusion 15. Therefore, the driver will not grip the part of the protrusion 15 that bulges outward from the outer circumferential surface with an unnatural wrist posture, and will not feel uncomfortable when gripping.

[0052] In addition, in the steering wheel 1 of this embodiment, a part (inner end 15ie) of the outer peripheral surface of the protrusion 15 bulges inward from the turning path Ti of the inner peripheral surface of the intersection region 13 of the rim portion 11. Therefore, when the driver presses his / her thumb Th against the upper inclined surface 17 to grip the outer portion of the intersection region 13 of the rim portion 11, the inner end 15ie of the protrusion 15, which bulges inward from the turning path Ti of the inner peripheral surface of the intersection region 13, is positioned above the thumb Th. Therefore, when the driver turns the steering wheel 1 in this state, the thumb Th of the driver who is pushing it upward gets caught on the inner end 15ie of the protrusion 15, preventing the driver's gripping position from shifting. In addition, when the driver directly grasps the protrusion 15 to turn the steering wheel 1, the driver's thumb Th which is pushing the steering wheel upward similarly gets caught on the inner end 15ie of the protrusion 15, preventing the driver's gripping position from shifting.

[0053] In addition, in the steering wheel 1 of this embodiment, the width of the protrusion 15 in the vehicle width direction increases toward the end (upper end) in the protrusion direction. Therefore, when the part of the thumb Th from the base to the vicinity of the first joint is pressed against the upper slope 17 of the side spoke part 12s and the outer part of the intersection region 13 of the rim part 11 is gripped with the other fingers in this state, the side where the width of the protrusion 15 increases is positioned above the base of the thumb Th and the other fingers. At this time, since the base end side of the protrusion 15 has a relatively narrow width in the vehicle width direction, it does not hinder a good grip (stable grip) of the rim part 11 in the state where the thumb Th is pressed against the upper slope 17. In addition, since the width of the protrusion 15 increases toward the protruding end side (upper end side), when the driver turns the steering wheel 1, the protrusion 15 can more reliably prevent the position of the driver's hand that pushes it upward.

[0054] Furthermore, in the steering wheel 1 of this embodiment, the side spoke portions 12s are inclined downward from the side end portions of the hub portion 10 toward the outside in the vehicle width direction. Therefore, when the driver grips the outer portion of the intersection region 13 of the rim portion 11, the driver can easily press the thumb Th against the upper inclined surface 17 (the connection region 17b) of the side spoke portion 12s. Furthermore, even if the vertical width of the side spoke portion 12s is wide, the thumb Th can be placed at a height close to the height of the turning center C1 and in that state the rim portion 11 can be stably gripped. Therefore, when this configuration is adopted, the turning operability of the steering wheel 1 can be maintained good.

[0055] The present invention is not limited to the above-described embodiment, and various design modifications are possible without departing from the spirit and scope of the present invention. For example, in the above embodiment, the rim portion 11 below the left and right side spoke portions 12s is formed in a horizontally long, generally U-shape, but the shape of the rim portion 11 below the left and right side spoke portions 12s (below the intersection region) is not limited to this. The shape of the rim portion 11 below the left and right side spoke portions 12s may be, for example, semicircular. The rim portion may also have a shape without the lower side portion 11a.

[0056] Furthermore, in the above embodiment, one lower spoke portion 12l is provided in addition to the left and right side spoke portions 12s, but the number and shape of the lower spoke portion 12l are not limited to those in the above embodiment. The number of lower spoke portions 12l may be two or more, and is not necessarily required. [Explanation of symbols]

[0057] 1. Steering wheel 11…Rim section 12s…Side spokes (spokes) 15...Protruding part 15u…Top surface (surface facing upwards) 16...Inflection section 17...Upper slope 17a…Main area 17b…Connection area 18...Lower slope 19...Inner slope To...Rotation trajectory (rotation trajectory of the outer surface) Ti…Rotation orbit (rotation orbit of the inner circumference)

Claims

1. A non-annular rim portion in which an upper region in a neutral steering state is interrupted; a spoke portion extending along a direction that corresponds to a vehicle width direction in a neutral steering state and having an outer end portion in the vehicle width direction connected to the rim portion, The spoke portion is an inflection portion extending along the extension direction of the spoke portion and facing the rider side; an upper slope extending from the inflection portion toward a front side of the vehicle in a direction that is upward in a neutral steering state; a lower slope extending from the inflection portion toward a vehicle front side toward a side that is downward in a neutral steering state, a radius of curvature of a portion of the upper slope that curves toward the front side of the vehicle is set to be larger than a radius of curvature of a portion of the lower slope that curves toward the front side of the vehicle, The rim portion includes a protruding portion that protrudes upward from a position adjacent to the upper slope in a neutral steering state, A steering wheel characterized in that the width of the protruding portion in the vehicle width direction in a neutral steering state increases toward the end in the protruding direction.

2. The upper slope is A main portion region extending linearly along an extension direction of the spoke portion in a neutral steering state; 2. The steering wheel according to claim 1, further comprising a connecting portion region that curves upward from an end portion of the main portion region on the rim portion side toward the protrusion portion in a neutral steering state.

3. 3. The steering wheel according to claim 2, wherein the protrusion has a flat inner inclined surface, at least a portion of which faces toward the driver and toward the inside in the vehicle width direction, in an area that is on the inside in the vehicle width direction when the steering is neutral.

4. 4. A steering wheel according to claim 3, wherein the inner inclined surface is continuous with the curved articulation regions of the spoke portions.

5. 5. The steering wheel according to claim 4, wherein a surface of the protruding portion that faces upward in a neutral steering state is a flat surface.

6. A steering wheel as described in any one of claims 1 to 5, characterized in that a portion of the outer surface of the protrusion bulges outwardly from the turning trajectory of the outer surface of the rim portion, which is positioned on an extension of the extension direction of the spoke portion.

7. A steering wheel as claimed in any one of claims 1 to 5, characterized in that a portion of the outer peripheral surface of the protrusion bulges inwardly from a turning trajectory of the inner peripheral surface of the rim portion, which is positioned on an extension of the extension direction of the spoke portion.

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