JP2014162330A - Steering wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steering wheel capable of effectively warming a rim part while suppressing costs.SOLUTION: In a rim part 15, a high-frequency grip part 23 having relatively high grip frequency is disposed with a comparatively costly first heater wire 26 having a relatively large heating value. Coldness when gripping the high-frequency grip part 23 when starting driving of an automobile can be relaxed. In the rim part 15, a low-frequency grip part 24 having relatively low grip frequency is disposed with a comparatively low-cost second heater wire 27 having a relatively small heating value. Waste of heat generation can be suppressed. By effectively selectively using the heater wires each having the different heating value according to the grip frequency, the rim part 15 can be effectively warmed while suppressing costs.

Description

  The present invention relates to a handle provided with a heat generating portion that generates heat when energized.

  Conventionally, when starting and driving an automobile, which is a vehicle parked in a cold area such as outdoors in winter, steering is performed to reduce the difficulty of operation and discomfort caused by the coldness of the steering wheel, that is, the steering wheel. A heater wire (heating wire) as a heating element is incorporated in the rim part of the wheel, and a structure that improves comfort by heating the steering wheel even when various engines have not warmed up shortly after starting is known. Yes.

  As such a configuration, for example, a configuration is known in which a heater wire attached to the back surface of a skin body as a covering material is wound around a base material of a rim portion of a Stirling wheel (for example, Patent Literature 1). In this configuration, the entire rim portion of the steering wheel is a target in the warm range, and substantially the same heat is generated over the entire rim portion.

JP 2008-37202 A (page 3-5, FIGS. 1-4)

  In general, the steering hole often grips the left and right sides or the vicinity of the upper part thereof, the position corresponding to the 9 o'clock to 3 o'clock position or the 10 o'clock to 2 o'clock position of the so-called clock face. There are relatively few opportunities to grip. However, in the case of the above-described steering wheel, since it is uniformly heated up to a part where the grip frequency is low, for example, when using an expensive heater wire with high temperature rise for the purpose of heating at high speed, it is not easy to suppress the cost. In addition, a configuration for suppressing waste of heat generation at a position where the gripping frequency is low is necessary. Further, since there is only one type of heater wire, a configuration for suppressing a temperature difference that occurs when energization is switched on / off is required.

  The present invention has been made in view of these points, and an object of the present invention is to provide a handle that can effectively warm a gripping portion while suppressing cost.

  The handle according to claim 1, further comprising: a grip portion for operation; and a heat generating portion that is at least partially disposed in the grip portion and generates heat when energized to warm at least a surface portion of the grip portion. Comprises a high-frequency gripping part with a relatively high gripping frequency and a low-frequency gripping part with a relatively low gripping frequency, and the heat generating part is disposed at least in the high-frequency gripping part, and the heat generation amount is relatively A first heating element that is large and a second heating element that is disposed at least in the low-frequency gripping part and that generates a relatively small amount of heat.

  The handle according to claim 2 is the control device according to claim 1, wherein the first heating element is turned on / off according to the temperature, and the second heating element is always energized to maintain a constant heat generation amount. Is provided.

  The handle according to claim 3 is the handle according to claim 1 or 2, wherein the gripping portion is formed in an annular shape, and the high-frequency gripping portion is a portion including both sides of the gripping portion.

  The handle according to claim 4 is the handle according to any one of claims 1 to 3, wherein the first heating element is frequently folded back at least partially along a direction intersecting the longitudinal direction of the gripping portion. It is arrange | positioned at a holding part.

  According to the handle according to claim 1, the high-frequency gripping portion is disposed at the time of start-up by disposing the relatively large and relatively expensive first heating element on the high-frequency gripping portion having a relatively high gripping frequency. The coldness at the time of gripping can be alleviated, and the second heating element having a relatively small calorific value and a relatively inexpensive second heating element is disposed in the low-frequency gripping portion having a relatively low gripping frequency, thereby wasting heat. Can be suppressed. That is, by effectively using different heating elements having different calorific values in accordance with the gripping frequency, the gripping portion can be effectively warmed while suppressing costs.

  According to the handle according to claim 2, in addition to the effect of the handle according to claim 1, the control device switches on / off of energization of the first heating element according to the temperature and constantly energizes the second heating element to be constant. By maintaining the calorific value, the temperature difference caused by the temperature rise and fall caused by the first heat generating element can be reduced by the second heat generating element so that the temperature difference is less likely to occur, and the warming performance can be further improved.

  According to the handle according to claim 3, in addition to the effect of the handle according to claim 1 or 2, the high-frequency gripping part is located at a position including both sides of the gripping part formed in an annular shape. In addition, it is possible to warm the position that is frequently gripped during subsequent driving or the like more effectively and at high speed.

  According to the handle according to claim 4, in addition to the effect of the handle according to any one of claims 1 to 3, a part of the first heating element is alternately folded back along the direction intersecting the longitudinal direction of the gripping portion. By arranging in the high-frequency gripping part, the density of the first heating element can be increased in the high-frequency gripping part, and the first heating element can be arranged over the entire high-frequency gripping part. A wider range can be warmed more effectively and rapidly.

It is a top view which shows a part of 1st Embodiment of the handle | steering_wheel of this invention. It is a perspective view which shows a part of handle same as the above. It is sectional drawing which shows the holding part of a handle same as the above. It is a perspective sectional view which shows the holding part of a handle same as the above. It is a perspective view which shows a part of handle same as the above from the front side. It is sectional drawing which shows the II equivalent position of FIG. It is a perspective view which shows a part of handle same as the above. It is a longitudinal cross-sectional view which shows a part of handle same as the above. It is a cross-sectional view which shows a part of handle same as the above. It is a front view which shows a handle same as the above. It is a side view which shows a handle | steering-wheel and a passenger | crew typically, and (a) shows a normal state, (b) shows the state which the passenger | crew entered the handle | steering-wheel. It is a graph which shows each temperature control of the 1st heat generating body and 2nd heat generating body of a steering wheel same as the above. It is a side view which shows a part of 2nd Embodiment of the handle | steering_wheel of this invention. It is a top view which shows a part of 3rd Embodiment of the handle | steering_wheel of this invention. It is sectional drawing which shows the II-II equivalent position of FIG. It is a perspective view which shows a part of 4th Embodiment of the handle | steering_wheel of this invention. It is a perspective view which shows a part of 5th Embodiment of the handle | steering_wheel of this invention. It is a perspective sectional view showing a grasping part of a 6th embodiment of a handle of the present invention. It is sectional drawing which shows a part of holding part of a handle same as the above. It is a perspective view which shows a part of skin part of a handle same as the above. It is a perspective sectional view showing a grasping part of a 7th embodiment of a handle of the present invention.

  Hereinafter, a first embodiment of a handle according to the present invention will be described with reference to the drawings.

  10 and 11, reference numeral 10 denotes a steering wheel which is a steering wheel of an automobile as a vehicle, for example. The steering wheel 10 is mounted on a steering wheel main body 11 which is a steering wheel main body and an occupant A side of the steering wheel main body 11. An airbag device (airbag module) 12, which is a center pad as a pad body, and a switch module (not shown) are provided. The steering wheel 10 is normally mounted on a steering shaft provided in the vehicle in an inclined state. Hereinafter, the occupant A side, that is, the front side, and the steering shaft side, that is, the rear side, of the airbag device 12 will be described. The lower side, the front side of the vehicle, that is, the windshield side above the front side will be described as the front side, and the rear side of the vehicle, ie, the lower side of the rear side will be described as the rear side or the front side.

  As shown in FIGS. 1 to 11, the steering wheel main body 11 is formed at least partially along the circumference, and in this embodiment, a rim portion (ring portion) as an annular gripping portion. 15, a boss portion 16 located inside the rim portion 15, and a plurality of spoke portions 17 in the present embodiment that connect the rim portion 15 and the boss portion 16. In addition, a substantially cylindrical boss 18 having a serration structure that meshes with the steering shaft is provided at a lower portion on the vehicle body side of the boss portion 16, and a core body also called a hub core is formed on the boss 18 The boss plate 19 is integrally fixed by molding a magnesium alloy or the like, for example. Further, a resin lower cover 20, also called a back cover or a body cover, is attached to the boss portion 16, and the lower side portion of the boss portion 16 is covered. A cored bar 17a, which is a spoke cored bar of the spoke part 17, is integrally extended from the boss plate 19 or fixed by welding or the like. Further, the core metal 15a of the rim part 15 is fixed to the core metal 17a of the spoke part 17 by welding or the like.

  The rim portion 15 is also called a grip portion, and includes a core metal 15a that is a rim core metal, and a covering portion 22 that covers the entire surface of the core metal 15a. A high-frequency gripping part 23 gripped at a relatively high frequency by A and a low-frequency gripping part 24 gripped at a relatively low frequency are set. The first and second heater wires 26 as the first and second heating elements constituting the heat generating part 25 that generates heat by energization and warms the rim part 15 through the covering part 22 are formed in the covering part 22. 27 is arranged. Further, the covering portion 22 and the heat generating portion 25 are covered with a skin portion 28 as a thin skin covering material. In order to protect the occupant A, the rim portion 15 is configured so that the core metal 15a, 17a is deformed and moved together with the spoke portion 17 and the like in a state where a large force is applied, and absorbs the impact. .

  The covering portion 22 is also called a handle core (steering core) or the like, and in the present embodiment, for example, a soft foamed polyurethane resin that is an elastic body is used that is finely foamed. The covering portion 22 is formed, for example, by inserting the cored bar 15a and the cored bar 17a into a mold that opens and closes in the vertical direction. The covering portion 22 may be formed in multiple layers.

  The high-frequency gripping portion 23 is a position including both the left and right sides when the rim portion 15 is viewed from the front side (occupant A side) with the steering wheel 10 in the neutral position, that is, in the present embodiment, the rim portion 15 (core The portion near the connecting portion between the gold 15a) and the spoke portion 17 (core metal 17a) extending in the left-right direction, in other words, the imaginary line L extending in the left-right direction through the center of the rim portion 15 (the central axis of the steering shaft) As shown in the figure, the portion extends up and down by a predetermined angle, for example, about 30 degrees. That is, the high-frequency gripping portion 23 is basically a portion that is gripped when the automobile is going straight ahead.

  The low-frequency gripping portion 24 is a position excluding the left and right sides when the rim portion 15 is viewed from the front side (passenger A side) with the steering wheel 10 in the neutral position, that is, in this embodiment, the rim portion 15 (core The portion excluding the portion near the connecting portion between the gold 15a) and the spoke portion 17 (core metal 17a) extending in the left and right direction, in other words, a portion extending up and down by a predetermined angle, for example, about 30 degrees with respect to the virtual line L. The part to be removed, that is, the part of the rim part 15 excluding the high-frequency gripping part 23. That is, the low-frequency gripping portion 24 is basically a portion that is gripped when the automobile is not traveling straight.

  The first and second heater wires 26 and 27 constituting the heat generating portion 25 are single wires in which an insulating film made of, for example, fluororesin (PTFE or the like) is provided on the surface of the core wire that generates heat when energized. These first and second heater wires 26 and 27 are respectively embedded in (first and second) groove portions 31 and 32 formed in the covering portion 22, and the first heater wire 26 is mainly gripped frequently. The second heater wire 27 is mainly disposed at a position corresponding to the low-frequency gripping section 24. The first and second heater wires 26 and 27 are connected to a control device (thermo controller) 33 including a thermostat as a heat retaining means in the lower cover 20 and are energized by the control device 33. Is configured to generate heat.

  The first heater wire 26 is higher in temperature rise than the second heater wire 27, in other words, has a larger amount of heat generation than the second heater wire 27. The first heater wire 26 includes a main wiring portion 26a disposed in the high-frequency gripping portion 23, and a sub wiring portion 26b disposed in the low-frequency gripping portion 24 continuously to the main wiring portion 26a. They are arranged symmetrically on one side and the other side of the rim part 15, and are electrically connected to each other by a branch connection part (not shown) at the upper part of the rim part 15, that is, at a position corresponding to 12:00 of the analog timepiece. The main wiring portion 26a is folded back in a wave shape in the direction intersecting (orthogonal) with respect to the circumferential direction (latitude direction) of the rim portion 15 in the high-frequency gripping portion 23, and the front side of the rim portion 15 ( The back side) and the back side (near side) are alternately positioned, and are spread over the entire high-frequency gripping portion 23. That is, the main wiring portion 26a repeatedly intersects with the outermost circumferential position of the rim portion 15 at a plurality of locations, and when viewed in a cross section in a direction orthogonal to the circumferential direction, the circumferential direction of the rim portion 15 It is wound over, for example, about 3/4 round in a direction (meridian direction) intersecting (orthogonal) with respect to (parallel direction). Further, the main wiring portion 26 a is arranged so as to extend to the vicinity of the continuous portion between the spoke portion 17 and the rim portion 15 at a position corresponding to the spoke portion 17. Therefore, the arrangement density of the first heater wires 26 is higher than that of the second heater wires 27 in the high-frequency gripping portion 23. Further, the sub wiring part 26b is continuous with both ends of the main wiring part 26a, and is disposed substantially parallel to the second heater wire 27 along the circumferential direction at a position on the outer peripheral side of the rim part 15.

  The second heater wire 27 is lower in temperature rise than the first heater wire 26, in other words, has a smaller amount of heat generation than the first heater wire 26. The second heater wire 27 is disposed along the circumferential direction of the rim portion 15 over the low-frequency gripping portion 24 to the high-frequency gripping portion 23, that is, symmetrically disposed on one side and the other side of the rim portion 15. In the upper portion of the rim portion 15, that is, at a position corresponding to 12 o'clock of the analog timepiece, they are electrically connected to each other by a branch connection portion (not shown). The second heater wire 27 is located near the outer periphery of the rim portion 15, for example, and detours to the front side (back side) of the high-frequency gripping portion 23 at the position of the high-frequency gripping portion 23. One heater line 26 is arranged so as not to intersect. As a result, the first heater wire 26 and the second heater wire 27 are not electrically short-circuited with each other.

  The groove portions 31 and 32 have a depth equal to or larger than the diameter of the first and second heater wires 26 and 27, and the first and second heater wires 26 and 27 embedded in the inside are outside the covering portion 22. It is designed not to protrude from. The groove portions 31 and 32 have, for example, at least the opening side (the opening side communicating with the outer peripheral surface of the covering portion 22) as a width dimension equal to or smaller than the diameter dimension of the first and second heater wires 26 and 27. The second heater wires 26 and 27 may be pressed and fixed inside, or the first and second heater wires 26 and 27 may be bonded and fixed. The grooves 31 and 32 may be formed using a predetermined cutting device (not shown) after the covering portion 22 is formed, or may be formed when the covering portion 22 is formed.

  The control device 33 is formed in, for example, a rectangular parallelepiped shape by incorporating a thermostat or the like inside the housing 34, and is electrically connected to both ends of the first heater wires 26 and 26 via the power supply wires 35 and 35. In addition, it is electrically connected to the branch connection portion of the first heater wire 26 through a lead wire 36 electrically connected to a power source (not shown). Similarly, the control device 33 is electrically connected to both end portions of the second heater wires 27 and 27 through power supply wires 37 and 37 and is also connected to a power source (not shown). Is electrically connected to the branch connection portion of the second heater wire 27. Hereinafter, for the sake of clarity, the configuration for the first heater wires 26 and 26 (for example, the power supply wires 35 and 35 and the lead wire 36) and the configuration for the second heater wires 27 and 27 (for example, The power supply lines 37 and 37 and the lead wire 38) are collectively illustrated as one. The control device 33 is accommodated in a space 39 between the lower cover 20 and the core 17a of the spoke 17 of the steering wheel body 11, as shown in FIGS. The support ribs 40 are supported and fixed as support portions projecting from the inner surface 20a of the lower cover 20. Here, the support ribs 40, 40 are separated from each other substantially in parallel to each other from the inner surface 20a of the lower cover 20 toward the core metal 17a of the spoke portion 17, that is, along the radial direction of the steering wheel 10 (steering wheel main body 11). Has been projecting. The support ribs 40, 40 are formed in a longitudinal shape along the surface direction of the lower cover 20, and are positioned along both sides on the rear side (occupant A side) of the control device 33, and the tip portion is Cylindrical support protrusions 40a and 40a are formed. These support protrusions 40a and 40a regulate the movement of the control device 33 in the direction away from the lower cover 20, that is, toward the spoke portion 17 (core metal 17a). Therefore, the support protrusions 40a and 40a prevent the control device 33 from coming off from the lower cover 20 to the spoke portion 17 side. And by these support ribs 40, 40, the control device 33 causes the virtual plane P orthogonal to the axial direction (steering shaft direction) of the rim portion 15 of the steering wheel body 11, that is, the central portion in the thickness direction of the rim portion 15. Is fixed so as to have an acute angle toward the front when viewed from the side in the vehicle width direction (angle α in FIG. 11A).

  Further, as shown in FIGS. 5 and 6, the feeder lines 35 and 35 and the lead wire 36, and the feeder lines 37 and 37 and the lead wire 38, together with the first and second heater wires 26 and 27, respectively, are covered portions. 22 is fixed to a concave portion 41 provided in 22. Here, the concave portion 41 is, for example, in the vicinity of a continuous portion with the rim portion 15 of the spoke portion 17 of the steering wheel 10 in the neutral position, that is, outside the boss portion 16 (FIG. 1), on the front side, that is, on the rear side (anti-occupant A Side). Further, the recess 41 is provided in a substantially rectangular shape in a front view and is provided in a groove shape along the spoke portion 17 continuously with the recess body portion 41a continuous with the groove portions 31 and 32. Feed wire fixing portions 41b and 41b for embedding and fixing the electric wires 35 and 35 and the feed wires 37 and 37, and the recess main body portion 41a are provided in a groove shape along the spoke portion 17, and lead wires 36 and 38 And a lead wire fixing part 41c for embedding and fixing. In addition, a plurality of pin-like fixing portions 41d for hooking and fixing excess portions of the first and second heater wires 26 and 27 are provided inside the recess main body portion 41a. A fitting portion 41e for fitting and fixing the connecting portion 43 between the 35 and the first heater wire 26 and the connecting portion 44 between the feeding wires 37 and 37 and the second heater wire 27 is provided on the side portion on the rim portion 15 side. Is provided.

  Further, as shown in FIGS. 3 and 4, etc., the skin portion 28 is formed in a planar shape, for example, with leather or synthetic resin, and has a covering portion 22 and a heat generating portion 25 (first and second heater wires 26). 27) and is wrapped around the surface of the covering portion 22. That is, the skin part 28 does not mean only leather, but means any thin member (including leather, synthetic leather, etc.) covering the covering part 22 and the heat generating part 25. The skin portion 28 is fixed by being wound around the covering portion 22 and the heat generating portion 25, and both ends are sewn and joined together with a sewing thread 45 or the like.

  As shown in FIG. 10, the airbag device 12 includes a bag-shaped airbag, a resin cover body 47 that covers the folded airbag, an inflator that injects gas, and the like when the automobile collides. For example, gas is rapidly injected from the inflator into the airbag, the airbag stored in a folded state is rapidly inflated, the cover body 47 is cleaved, and the airbag is inflated and deployed on the front side of the occupant A. The occupant A is protected. The airbag device 12 may be integrated with a horn switch mechanism as a switch device.

  In the steering wheel 10 shown in FIGS. 1 to 11, the first and second heater wires 26 and 27 generate heat due to energization from the control device 33 supplied with power from the power source side when the automobile is started. At this time, the high-frequency gripping part 23 in which the first heater wire 26 having a relatively high temperature rise is mainly arranged is quickly heated, and the second heater wire 27 having a relatively low temperature rise is mainly arranged. The low frequency grip 24 is heated relatively gently.

  Here, the second heater wire 27 saturates heat generation and heat dissipation due to energization from the control device 33 when a predetermined time or more elapses, so that it is possible to control energization on / off and the energization amount according to temperature. It is possible to maintain a substantially constant temperature (for example, about 30 ° C.) simply by energizing with a constant energization amount. Further, the first heater wire 26 is energized when the energization is switched by turning on and off the thermostat of the control device 33, for example, at a timing when the temperature becomes a predetermined temperature (for example, about 40 ° C.) higher than the second heater wire 27. Is turned off and the energization is turned on again when it reaches a predetermined temperature lower than the second heater wire 27 (for example, about 20 ° C.), so that the temperature rises alternately across the temperature of the second heater wire 27 It is controlled to repeat the decrease and the decrease (FIG. 12). Accordingly, the second heater wire 27 relaxes the temperature difference caused by the temperature increase and decrease caused by the first heater wire 26, thereby enabling the temperature increase of the high-frequency gripping portion 23 in particular and the temperature difference. The hand of the occupant A holding the rim portion 15 with a simple configuration can obtain a substantially constant temperature sensation without requiring a special mechanism for keeping the temperature of the rim portion 15 (heat generating portion 25) constant. .

  As described above, according to the present embodiment, the first heater wire 26 having a relatively large calorific value (relatively high temperature rise performance) is mainly disposed in the high-frequency gripping portion 23 having a relatively high gripping frequency. As a result, the temperature of the high-frequency gripping part 23 can be quickly raised, and the coldness when the high-frequency gripping part 23 is gripped at the start of the vehicle in winter or in a cold region (at the start of operation) can be reduced. The low-frequency gripping portion 24 that can securely grip 15 and has a relatively low gripping frequency is mainly provided with a second heater wire 27 that generates a relatively small amount of heat (relatively low temperature rise). By doing so, it is possible to suppress waste of heat generation (loss) as in the case of heating at a high speed using a heater wire having a relatively large calorific value up to the low-frequency gripping portion 24. That is, by restricting the use of the first heater wire 26 having a high temperature rise property and an expensiveness mainly to the high-frequency gripping portion 23, the heat generation range is limited and the use amount of the first heater wire 26 is suppressed. The low-frequency gripping portion 24 that can improve the performance effectively and generally does not grip at a timing shortly after the start of the automobile mainly uses the second heater wire 27 that has a relatively small calorific value and is inexpensive. Even if it is gently warmed up, it is assumed that it is warmed up sufficiently when gripped, so that it is possible to suppress difficulty in operation due to the fact that the steering wheel 10 is cold. As a result, by effectively using heater wires (first and second heater wires 26 and 27) having different calorific values in accordance with the gripping frequency, the rim portion 15 can be effectively warmed while suppressing costs. The steering wheel 10 that can be provided can be provided.

  Then, the control device 33 switches on / off of the energization of the first heater wire 26 according to the temperature, and constantly energizes the second heater wire 27 to maintain a constant heat generation amount. The temperature difference caused by the rise and fall of the temperature can be reduced by the second heater wire 27 so that the temperature difference is less likely to occur, and the steering wheel 10 having excellent warm performance can be provided. In addition, when the energization control of the first and second heater wires 26 and 27 is performed, only the thermostat is used and the electronic control is not performed. Therefore, the parts cost is increased, the number of parts is increased, and the steering wheel 10 is increased. It is also possible to suppress an increase in weight.

  In particular, the high-frequency gripping portion 23 is started by setting the spoke portions 17 and 17 on both sides of the rim portion 15 formed in an annular shape, that is, a position including a position corresponding to 3 o'clock to 9 o'clock of a so-called analog timepiece. The position frequently gripped not only at times but also during subsequent driving can be warmed more effectively and at high speed.

  Further, the main wiring portion 26a which is a part of the first heater wire 26 is alternately folded along the direction intersecting the circumferential direction which is the longitudinal direction of the rim portion 15 and arranged in the high-frequency gripping portion 23, thereby Since the wiring density of the first heater wire 26 can be increased in the frequency gripping portion 23 and the first heater wire 26 can be arranged over the entire high-frequency gripping portion 23, a wider range of the high-frequency gripping portion 23 can be further increased. It can be heated effectively and quickly.

  Since most of the second heater wire 27 is located only on the outer periphery of the rim portion 15, the amount of use can be suppressed, and the second heater wire 27 can be manufactured at a lower cost.

  Further, the first and second heater wires 26 and 27, the power supply wires 35, 35, 37, and 37, the lead wires 36 and 38, and the connection portions 43 and 44 are disposed outside the boss portion 16 where the airbag device 12 is disposed. And disposed in the recess 41 provided in the covering portion 22. For this reason, when attaching the airbag apparatus 12 to the boss | hub part 16, the 1st and 2nd heater wires 26 and 27, the feeders 35, 35, 37, and 37 and the lead wires 36 and 38 do not become obstructive, and the air The bag device 12 can be easily and reliably attached to the boss portion 16. Also, the first and second heater wires 26 and 27, the power supply wires 35, 35, 37, and 37, the lead wires 36 and 38, and the connection portions 43 and 44 are in contact with metal parts such as the core metal 15a and the core metal 17a. There is no problem and the insulation is ensured and the reliability can be further improved. Further, the first and second heater wires 26 and 27, the power supply wires 35, 35, 37, and 37, the lead wires 36 and 38, and the connection portions 43 and 44 are provided outside the boss portion 16 side that is the center of the steering wheel 10. Since the weight increases, it is difficult to affect the moment of inertia and the operability (steerability) of the steering wheel 10 is not lowered. Further, the surplus portions of the first and second heater wires 26 and 27 can be hooked on the fixing portion 41d of the concave portion 41 so that the surplus portions can be stored so as not to float on the surface of the rim portion 15 of the steering wheel 10. Further, since the covering portion 22 is covered with the skin portion 28, the first and second heater wires 26 and 27, the power supply wires 35, 35, 37, and 37, the lead wires 36 and 38, and the connection portions 43 and 44, There is no unevenness on the surface, no discomfort during steering due to these unevenness, and the appearance is improved. Moreover, since the concave portion 41 is formed in the covering portion 22, the first and second heater wires 26 and 27, the feeder wires 35, 35, 37, and 37, the lead wires 36 and 38, and the connection portions 43 and 44 are supported. Therefore, it can be manufactured at a lower cost compared with the case of preparing a separate support for the purpose. The workability when fixing the first and second heater wires 26 and 27, the power supply wires 35, 35, 37, and 37, the lead wires 36 and 38, and the connection portions 43 and 44 to the recess 41 is also good.

  Further, by attaching the control device 33 to the inside of the lower cover 20 constituting the back side of the airbag device 12, for example, in the steering wheel 10 having the plurality of spoke portions 17, the core bars 15a and 17a are deformed by impact. Therefore, it is possible to dispose the control device 33 that satisfies the protection performance of the occupant A without disturbing the vehicle.

  That is, when the steering wheel 10 moves forward from the normal state shown in FIG. 11 (a) so that the occupant A is thrown forward due to a frontal collision of the automobile, as shown in FIG. 11 (b). Is abutted against the occupant A on the lower side of the rim 15 closest to the occupant A, and a load pressing the lower side of the rim 15 toward the front is applied, so that the core metal 15a of the rim 15 is deformed. The lower cored bar 17a connected to the cored bar 15a is deformed while moving forward, thereby absorbing the impact. At this time, the control device 33 is disposed between the support ribs 40, 40 in the lower cover 20 by being inclined so that the angle α is an acute angle toward the front with respect to the axial direction of the steering wheel 10. When the gold 17a is deformed, the support ribs 40, 40 are deformed, and the control device 33 is rotated so that, for example, the front side moves upward, and is disengaged from the support ribs 40, 40. There is nothing.

  Furthermore, since the control device 33 is held between the support ribs 40 and 40, it can be easily attached, and since no separate parts such as a case and screws are used, the cost of parts can be suppressed.

  In the first embodiment, if the first heater wire 26 is mainly disposed in the high-frequency gripping portion 23 and the second heater wire 27 is mainly disposed in the low-frequency gripping portion 24, the steering wheel 10 is formed. The arrangement may be changed according to manufacturing requirements, characteristics of the first and second heater wires 26 and 27, usage conditions, and the like. For example, the second heater wire 27 may be arranged so as to intersect the first heater wire 26 as in the second embodiment shown in FIG. In this case, the first and second heater wires 26 and 27 are reliably insulated by the insulating films on the surfaces of the first and second heater wires 26 and 27 to prevent an electrical short circuit. In addition, the groove portions 31 and 32 are formed deeper at the position where the first and second heater wires 26 and 27 intersect, so that the first and second heater wires 26 and 27 are covered with the covering portion 22 at this intersecting position. It can be reliably prevented from protruding from the surface.

  Further, in each of the above embodiments, the first heater wire 26 or the second heater wire 27 is pressed and covered with the lead wire 36 or the lead wire 38 as in the third embodiment shown in FIGS. As in the fourth embodiment shown in FIG. 16, a plurality of rib portions 41f are provided in the recess body portion 41a, and the first and second heater wires 26 and 27 are connected to the rib portions 41f. 41f may be held and fixed between the first and second heater wires 26, 27 and the power supply wires 35, 35, 37, 37 using a fixing member such as a double-sided tape with respect to the recess 41. It may be fixed.

  Further, as in the fifth embodiment shown in FIG. 17, claw portions 40b and 40b are formed on the upper side (rear side) of the front ends of the support ribs 40 and 40 in place of the support protrusions 40a and 40a. The control device 33 may be held and fixed by the claw portions 40b and 40b.

  In each of the above embodiments, the control device 33 may be fixed to the lower cover 20 using a tape member such as a double-sided tape. Further, the skin portion 28 is formed by, for example, arranging the first and second heater wires 26 and 27 on the covering portion 22 and then covering the first and second heater wires 26 and 27 with urethane or the like. Also good.

  Next, a sixth embodiment will be described with reference to FIGS. In addition, about the structure and effect | action similar to said each embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the present embodiment, in each of the above embodiments, the third heater wire 50 as the third heating element is embedded in the covering portion 22 together with the skin portion 28.

  That is, as the skin portion 28, a material formed in a rectangular sheet shape using a member such as leather or synthetic leather is used. The vicinity of the end portion of the skin portion 28 (the end portion in the direction intersecting the circumferential direction that is the longitudinal direction of the rim portion 15) is folded along the folded portion 28a formed by folding back to the back side. A heater wire 50 is accommodated.

  In the folded portion 28a, the end portion of the skin portion 28 folded back on the back side is overlapped on the back surface of the skin portion 28 with the mating portion 28b joined intermittently or continuously by a joint portion (not shown). It is formed in a hollow cylinder. The mating portion 28b is set to an optimum width dimension according to the design characteristics and the sewing pattern by the sewing thread 45.

  The third heater wire 50 is a single wire in which an insulating film made of, for example, a fluororesin (PTFE or the like) is provided on the surface of the core wire that generates heat when energized. For example, the third heater wire 50 has a higher temperature rise than the second heater wire 27. The heat generation amount is larger than that of the two heater wires 27. The third heater wire 50 is electrically connected to the control device 33 via a power supply line (not shown), and generates heat when energized from the control device 33.

  In the covering portion 22, an embedded recess 51 as an embedded portion in which the third heater wire 50 is embedded together with the folded portion 28 a is recessed in a groove shape at a position excluding the spoke portion 17 along the inner periphery of the rim portion 15, for example. It is installed. In the present embodiment, the embedded recess 51 is set to have a cross-sectional shape corresponding to the folded portion 28a and the third heater wire 50. That is, on both side edge portions 51a of the embedding recess 51, a shape is formed in consideration of the mating portion 28b where the end portions where the folded portions 28a of the skin portion 28 are formed are overlapped. The embedded recess 51 may be formed by cutting after the covering portion 22 is formed, or may be formed at the same time as the covering portion 22 is formed.

  When the steering wheel 10 is manufactured, the skin portion 28 is previously punched, and the third heater wire 50 is sandwiched between both ends of the skin portion 28, and then double-sided tape, adhesive, or press bonding. By forming the joint portion by, for example, the folded portion 28a in which the third heater wire 50 is accommodated is formed.

  Next, the position where the sewing thread 45 is attached to the folded portion 28a, for example, the pilot hole 53 is intermittently opened along the longitudinal direction in the mating portion 28b, and then the third heater wire 50 is accommodated in the folded portion 28a. The skin portion 28 is wound around the covering portion 22 in which the embedded concave portion 51 is formed and the first and second heater wires 26 and 27 are arranged, and the folded portion 28a is embedded so as to fit in the embedded concave portion 51. These folded portions 28a are sewn with the sewing thread 45 at the position of the pilot hole 53 while the third heater wire 50 is wound around.

  As a result, the third heater wire 50 is fitted into the embedded recess 51 together with the folded portion 28 a of the skin portion 28, and in particular, the mating portion 28 b is fitted to both side edges 51 a of the embedded recess 51.

  As described above, according to the present embodiment, the third heater wire 50 is wound around the folded portion 28 a of the skin portion 28 and embedded in the embedded recess 51 of the covering portion 22, whereby the third heater wire 50 is embedded in the skin portion 28. The third heater wire 50 having a large wire diameter with good temperature rise can be used without causing appearance defects such as unevenness. Therefore, since the third heater wire 50 can warm the sewing portion by the sewing thread 45, that is, the inner peripheral side of the rim portion 15, in other words, the position corresponding to the fingertip of the occupant A holding the rim portion 15. The fingertip that is easy to get cold can be effectively warmed.

  Further, by winding the third heater wire 50, it is possible to serve as the end treatment of the skin portion 28, so that the appearance of the end portion of the sewing portion by the sewing thread 45 can be improved, and the skin portion 28 due to finishing man-hours and deterioration with time. It is also possible to reduce peeling of the film.

  In addition, since the third heater wire 50 plays the role of a core material, meandering of the sewing portion when sewing the skin portion 28 can be reduced.

  In the sixth embodiment, as in the seventh embodiment shown in FIG. 21, the skin portion 28 is formed by connecting the end portions of the folded portion 28a so as not to entrain the third heater wire 50. You may sew.

  Moreover, in said 6th and 7th embodiment, the outer skin part 28 sees a more favorable external appearance by making thickness thin through the part wound around the 3rd heater wire 50 of the folding | returning part 28a. Become.

  Furthermore, the position of the third heater wire 50 may be changed according to the sewing with the sewing thread 45, the thickness of the skin portion 28, or the use of components.

  Further, instead of the embedded recess 51, for example, a planar embedded portion is formed at a position on the inner peripheral side of the covering portion 22 along a direction intersecting the radial direction of the longitudinal section of the covering portion 22. Also good.

  Furthermore, instead of the third heater wire 50, at least a part of the first heater wire 26 or at least a part of the second heater wire 27 can be applied.

  In each of the above-described embodiments, the steering wheel 10 is not limited to the configuration including the three spoke portions 17, and can be applied to a configuration including the four spoke portions 17, for example.

  In place of the airbag device 12, for example, a pad body in which an impact absorber is accommodated can be used.

  The present invention can be suitably used, for example, as a steering wheel for an automobile.

10 Steering wheel that is a steering wheel
15 Rim as grip
23 High-frequency gripping part
24 Infrequent gripping part
25 Heat generating part
26 First heater wire as the first heating element
27 Second heater wire as second heating element
33 Control unit

Claims (4)

A grip for operation;
At least a part of the gripping part is disposed, and includes a heat generating part that generates heat by energization and warms at least the surface part of the gripping part,
The gripping part is
A high-frequency gripping part having a relatively high gripping frequency;
A low-frequency gripping portion with a relatively low gripping frequency,
The heating part is
A first heating element that is disposed at least in the high-frequency gripping part and has a relatively large calorific value;
A handle comprising: a second heating element disposed at least on the low-frequency gripping part and having a relatively small calorific value. 2. The handle according to claim 1, further comprising: a control device that switches on / off of energization of the first heating element according to temperature and constantly energizes the second heating element to maintain a constant heat generation amount. The gripping part is formed in an annular shape,
The handle according to claim 1 or 2, wherein the high-frequency gripping part is a part including both sides of the gripping part. 4. The first heating element is arranged in the high-frequency gripping part, at least a part of which is alternately folded along a direction intersecting the longitudinal direction of the gripping part. 5. Handle.

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