JP4775861B2 - Parking brake device for vehicle - Google Patents

Description

  The present invention relates to a parking brake device in a vehicle that enables a vehicle to be held in a braked parking state by engaging a parking lock pole with a rotating body interlocking with a wheel in a detachable manner.

  Conventionally, there is a parking brake device disclosed in Patent Document 1 below. According to this publication, a parking brake device includes a power transmission rotating body that rotates around an axis in conjunction with a wheel, a parking lock pole that is pivotally supported by a vehicle body stationary side member, The rotating body includes a plurality of engagement portions formed in the circumferential direction thereof, and engaged portions that can be engaged with and disengaged from the engagement portions of the parking lock pole by swinging the parking lock pole. The engaged portion is a parking lock gear, and the parking lock gear is an annular shape that integrally projects from one axial end surface toward the outside in the axial direction on the axis of the rotating body. And a gear tooth that is formed on the outer peripheral surface of the boss portion and is detachably engaged with the engaging portion of the parking lock pole.

Then, when the engaging portion of the parking lock pole is engaged with the gear teeth, the rotation of the rotating body is prevented, and the wheels interlocking with the rotating body freely roll on the running surface. That is blocked. As a result, the vehicle is held in a braked parking state.
JP-A-11-254084

  By the way, as described above, the parking lock gear according to the prior art includes a boss portion protruding from one end surface of the rotating body and gear teeth formed on the outer peripheral surface of the boss portion.

  Here, at the time of parking, a large load may be applied to the boss portion in preventing free rolling of the wheels. Therefore, a high strength is given to the boss portion to counter this load. However, since the parking lock gear tends to be heavy due to this, the total mass of the combined body of the rotating body and the parking lock gear becomes large, and an unnecessarily large inertia force is generated during power transmission for traveling. There is a fear. This is not preferable in order to obtain smooth running with good responsiveness during acceleration or the like.

  The present invention has been made paying attention to the above situation, and an object of the present invention is that a parking lock pole engages with an engaged portion formed on a rotating body that rolls with a wheel. In the parking brake device for a vehicle in which the rotation of the rotating body is prevented, the total mass of the combined body of the rotating body and the engaged portion is reduced, and the combination is performed during power transmission for traveling. It is to prevent the body from generating an excessively large inertial force.

The invention of claim 1 includes a power transmission rotating body 25 that rotates around an axis 15 in conjunction with the wheel 4, a parking lock pole 27 that is pivotally supported by the vehicle body stationary side member 11 so as to be swingable A, In a vehicle provided with a plurality of rotating bodies 25 in the circumferential direction thereof, and an engaged portion 29 that can be engaged with and disengaged from the engaging portion 28 of the parking lock pole 27 by swinging the parking lock pole 27. In parking brake device,
The parking brake device for a vehicle is characterized in that the engaged portions 29 are individually and integrally projected on one end face in the axial direction of the rotating body 25.

  In addition, in this section, the reference numerals and drawing numbers appended to the above terms are not intended to limit the technical scope of the present invention to the “Example” section and the contents of the drawings described later.

  The effects of the present invention are as follows.

According to the first aspect of the present invention, there is provided a power transmission rotating body that rotates around an axis in conjunction with a wheel, a parking lock pole that is pivotally supported by a vehicle body stationary side member, and a periphery of the rotating body. In a parking brake device for a vehicle, which is formed in a plurality of directions and includes an engaged portion that can be engaged and disengaged by swinging the parking lock pole,
The engaged parts are individually and integrally projected on one end face in the axial direction of the rotating body.

  For this reason, the engaged portion that engages with the engaging portion of the parking lock pole corresponds to the gear tooth itself in the prior art, and the engaged portion has an annular boss in the prior art. Department does not exist. Therefore, the total mass of the combined body of the rotating body and the engaged portion is reduced as compared with that of the prior art, and thus an unnecessarily large inertia force is generated in the combined body when transmitting power for traveling. This is prevented. As a result, smooth running with better response can be obtained during acceleration.

  Further, as described above, there is no ring-shaped boss portion in the prior art, and there is a gap between each engaged portion. Therefore, when the power is transmitted, the lubricating oil around the rotating body While the flow is prevented from being inhibited by the boss portion, the lubricating oil smoothly flows through the gap. Therefore, unnecessary power loss is prevented, for example, the rotation of the lubricating oil with respect to the rotating body is suppressed. Also in this respect, smooth running with better response can be obtained.

  The parking brake device for a vehicle according to the present invention relates to a vehicle in which rotation of the rotating body is prevented by engaging a parking lock pole with an engaged portion formed on a rotating body that rolls with a wheel. In the parking brake device according to the present invention, the total mass of the combined body of the rotating body and the engaged portion is reduced so that an unnecessarily large inertia force is not generated in the combined body when transmitting power for traveling. In order to achieve the above object, the best mode for carrying out the present invention is as follows.

  That is, a parking brake device in a vehicle includes a power transmission rotating body that rotates around an axis in conjunction with wheels, a parking lock pole that is pivotally supported by a vehicle body stationary side member, and the rotating body. There are provided a plurality of engagement portions that are formed in the circumferential direction and that can be engaged with and disengaged from the engagement portion of the parking lock pole by swinging the parking lock pole. The engaged parts are individually and integrally projected on one end face in the axial direction of the rotating body.

  In order to explain the present invention in more detail, an embodiment thereof will be described with reference to the accompanying drawings.

  In the figure, reference numeral 1 denotes a vehicle driving device. The drive device 1 includes an engine that is a drive source 2 and an automatic transmission 5 that automatically shifts the driving force from the drive source 2 and transmits it to the wheels 4 via the differential device 3.

  The automatic transmission 5 includes a transmission case 7 constituting an outer shell thereof, a torque converter 8 for inputting a driving force output from the driving source 2, and a clutch for connecting and outputting an output from the torque converter 8 A device 9 and a continuously variable transmission 10 that receives an output from the clutch device 9 and continuously outputs and outputs the continuously variable transmission are provided. The transmission case 7 corresponds to a part of the vehicle body stationary side member 11.

  The continuously variable transmission 10 receives the output from the clutch device 9, and a driven shaft 14 that rotates together with the driving pulley 13, and a driven shaft that rotates together with the driven pulley 16 around an axis 15 parallel to the driving shaft 14. A shaft 17 and a metal endless belt 18 wound around the drive and driven pulleys 13 and 16 are provided. Lubricating oil is supplied to the continuously variable transmission 10 to ensure smooth driving.

  The drive pulley 13 (or driven pulley 16) is fixed to the fixed shaft 20 formed integrally with the drive shaft 14 (or driven shaft 17), and faces the fixed face 20 in the axial direction and is movable in the axial direction. And a movable face 21 supported by the drive shaft 14 (or the driven shaft 17). The endless belt 18 is wound between the opposing surfaces of the fixed and movable faces 20 and 21.

  The continuously variable transmission 10 is a known one, and when the power for traveling is transmitted, the engagement diameter of the endless belt 18 to the drive pulley 13 automatically increases as the rotation of the drive shaft 14 increases. On the other hand, the diameter of engagement of the endless belt 18 with the driven pulley 16 is reduced. That is, in the continuously variable transmission 10, the speed reduction ratio increases as the rotation of the drive shaft 14 decreases, while the speed reduction ratio decreases as the speed increases. In the illustrated example, the drive shaft 14 is stopped while the vehicle is parked, and the reduction ratio of the continuously variable transmission 10 is maximized.

  In the above-described configuration, the parking brake device 24 that can hold the vehicle in a braked parking state is provided.

  The parking brake device 24 rotates around an axis 15 in conjunction with the wheel 4 to transmit power from the driving source 2 to the wheel 4 and to the vehicle body stationary side member 11. A parking lock pole 27 pivotally supported by the pivot shaft 26 so as to be swingable A, and a plurality (eight) of the rotating body 25 are formed at equal pitches in the circumferential direction. An engaging portion 28 of the parking lock pole 27 and an engaged portion 29 that can be engaged and disengaged are provided. The engaging portion 28 protrudes from the swinging end portion of the parking lock pole 27 toward the engaged portion 29 and has a taper shape toward the protruding direction. When the vehicle is brought into a braked parking state, the parking lock pole 27 is swung A by the occupant's operating force B, and the engaging portion 28 of the parking lock pole 27 is engaged with the engaged portion 29. What is necessary is just to combine (in FIG. 1, a dashed-dotted line).

  The rotating body 25 corresponds to the fixed face 20 of the driven pulley 16 in the continuously variable transmission 10. The engaged portions 29 have the same shape and the same size, and the engaged portions 29 are arranged at equal pitches in the circumferential direction around the axis 15. Each of the engaged portions 29 protrudes integrally and individually on the back surface, which is one end surface of the fixed face 20 in the axial direction. A gap 32 is formed between the engaged portions 29 and 29 adjacent in the circumferential direction. When the engaging portion 28 of the parking lock pole 27 is engaged with the engaged portion 29, the engaging portion 28 is closely fitted in the gap 32 in the circumferential direction around the shaft center 15, It abuts on both engaged portions 29 and 29.

  According to the above configuration, the engaged portions 29 are individually and integrally protruded from one end surface of the rotating body 25 in the axial direction.

  For this reason, the engaged portion 29 that engages with the engaging portion 28 of the parking lock pole 27 corresponds to the gear tooth itself in the prior art, and the engaged portion 29 has a circle in the prior art. There is no ring-shaped boss. Therefore, since the total mass of the combined bodies 25 and 29 of the rotating body 25 and the engaged portion 29 is reduced as compared with that of the prior art, the combined bodies 25 and 29 are transmitted during power transmission for traveling. It is possible to prevent an unnecessarily large inertia force from being generated. As a result, smooth running with better response can be obtained during acceleration.

  Further, as described above, there is no ring-shaped boss portion in the prior art, and a gap 32 is generated between each engaged portion 29. Therefore, at the time of power transmission, around the rotating body 25. While the flow of the lubricating oil is prevented from being hindered by the boss portion, the lubricating oil smoothly flows through the gap 32. Therefore, unnecessary power loss is prevented, for example, the rotation of the lubricating oil with respect to the rotating body 25 is suppressed. Also in this respect, smooth running with better response can be obtained.

  Further, the fixed face 20 as the rotating body 25 is engaged with the endless belt 18 to transmit power when power for traveling is transmitted, and has sufficient strength.

  For this reason, the fixed face 20 at the time of parking can sufficiently resist the load from the engaged portions 29 that protrude integrally with the fixed face 20. Therefore, as described above, even when each engaged portion 29 protrudes from the fixed face 20 and the fixed face 20 is used for the parking brake device 24, it is not necessary to reinforce the fixed face 20 separately. Therefore, the total mass of the combination bodies 25 and 29 can be further reduced.

  Although the above is based on the illustrated example, the fixed face 20 of the drive shaft 14 may be applied as the rotating body 25.

FIG. 3 is a partial side view of FIG. 2. It is sectional drawing of the drive device of a vehicle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive device 2 Drive source 3 Differential device 4 Wheel 5 Automatic transmission 7 Transmission case 10 Continuously variable transmission 11 Car body stationary side member 13 Drive pulley 14 Drive shaft 15 Axis 16 Drive pulley 17 Drive shaft 18 Endless belt 20 Fixed face 24 Parking brake device 25 Rotating body 26 Pivot shaft 27 Parking lock pole 28 Engaging portion 29 Engaged portion 32 Gap A Swing B Operating force

Claims (1)

A rotating body for power transmission that rotates around the axis in conjunction with the wheels, a parking lock pole pivotally supported by the stationary body member, and a plurality of the rotating body in the circumferential direction, In a parking brake device in a vehicle provided with an engagement portion of the parking lock pole and an engaged portion that can be engaged and disengaged by swinging of the parking lock pole,
A parking brake device for a vehicle, wherein the engaged parts are individually and integrally projected on one end face in the axial direction of the rotating body.

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