JP4296830B2 - Parking brake device for small electric vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small electric vehicle represented by an electric passenger cart and the like, and more particularly to a parking brake device for a small electric vehicle that enables both traveling by an electric motor and manual traveling.
[0002]
[Prior art]
Many small electric vehicles of this type have a reduction gear mechanism inside a metal casing and an electric motor outside the casing, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-247215 (Patent Document 1). A power unit having the provided configuration is mounted on the vehicle body, and driving wheels (generally rear wheels) are directly supported by the power unit. The output of the electric motor is decelerated by the reduction gear mechanism and transmitted to the drive wheels.
[0003]
For example, in the case of a single-seater electric passenger cart, a clutch is provided on the intermediate shaft of the reduction gear mechanism in order to enable not only traveling by an electric motor but also traveling by hand. By disconnecting this clutch, the power transmission system between the drive motor and the electric motor, whose rotation is braked by the action of the electromagnetic brake device when the accelerator is turned off, is cut off. It can be pushed by hand with light force.
[0004]
The clutch is provided on the intermediate shaft and supports a large gear of two adjacent large and small gears so that it can rotate with respect to the intermediate shaft and immovably in the axial direction, and the small gear can rotate integrally with the intermediate shaft in the axial direction. Is a meshing clutch that engages and disengages the clutch by engaging and disengaging the tooth end of the small gear as it is in the clutch recess that is engraved on the side of the large gear by slidingly supporting the shaft and sliding the small gear. It is.
[0005]
In addition, when the parking brake device is provided, it is more compact with a smaller number of parts if one parking brake device is provided on the intermediate shaft of the reduction gear mechanism than when the parking brake device is separately provided on the left and right drive wheels. In addition, since the shaft torque applied to the intermediate shaft is smaller than the shaft torque applied to the axle of the drive wheel, there is an advantage that the brake capacity can be reduced.
[0006]
For this reason, a clutch and a parking brake device are provided on the intermediate shaft of the reduction gear mechanism.
[0007]
[Patent Document 1]
JP 2000-247215 A
[Problems to be solved by the invention]
However, in order to slide the small gear of the intermediate shaft in the axial direction and engage its tooth end with the clutch recess on the side surface of the large gear, it is necessary to slightly rotate the small gear to align the concave and convex positions of both gears. For this reason, there has been a problem that the connectivity of the clutch is deteriorated when the rotation of the intermediate shaft is locked by the parking brake device provided on the intermediate shaft.
[0009]
This problem becomes prominent especially when the small gear is a helical gear for the purpose of improving the tooth surface strength and reducing the meshing noise. Since the helical gear has helically twisted teeth, not only when the clutch is connected, but also when the connection is released, the small gear must be rotated slightly.
[0010]
The present invention has been made to solve this problem, and it is easy to intermittently operate the clutch even in the power unit configuration in which the clutch and the parking brake device are provided on the intermediate shaft of the reduction gear mechanism. An object of the present invention is to provide a parking brake device for a small electric vehicle that has high durability and braking force, is simple in structure and easy to manufacture, and can prevent noise and improve accuracy. .
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a parking brake device for a small electric vehicle according to the present invention, as described in claim 1, reduces the output of the electric motor and the electric motor to the drive wheel side. A transmission reduction gear mechanism , an electromagnetic brake device that brakes rotation of the input shaft of the reduction gear mechanism by operation of an accelerator lever, and a parking that is provided at an end portion of the intermediate shaft of the reduction gear mechanism and brakes rotation of the intermediate shaft In a small electric vehicle in which a power unit integrally configured with a brake device and a rear wheel axle that is rotatably supported by fixing rear wheels to both left and right ends is connected to a vehicle body frame via a pivot shaft , The reduction gear mechanism includes an input shaft, a primary drive gear, an intermediate shaft, a primary driven gear, a secondary drive gear, and a secondary drive rib. Including a gear, and housed in the casing of the power unit together with the differential gear mechanism and the electromagnetic brake device, the input shaft is integrally connected to the output shaft of the electric motor and the primary drive gear is engraved, the primary driven gear is The intermediate drive shaft meshes with the primary drive gear and is rotatably supported with respect to the intermediate shaft supported in parallel with the input shaft. The secondary drive gear is rotatable with respect to the intermediate shaft and slidable in the axial direction. Provided with a meshing clutch between the primary driven gear and the secondary driven gear, which is provided in a differential gear mechanism so as to mesh with the secondary drive gear, and the parking brake device rotates on an intermediate shaft of the reduction gear mechanism. Integrated rotation side control And member, wherein the reduction gear mechanism and a stationary side braking member provided on the casing side which is accommodated, said stationary brake member by a predetermined small angle around the axis of the intermediate shaft relative to the casing turning And a biasing means for biasing the fixed-side braking member toward the rotational direction when the vehicle moves forward. When the engagement state of the meshing clutch is poor in the braking state by the parking brake device, When the rotational force is applied from the outside to the secondary drive gear via the secondary driven gear, the secondary drive gear is rotated by the predetermined minute angle together with the rotation-side braking member and the stationary-side braking member to connect the meshing clutch. Further , it is characterized in that it is configured to facilitate release .
[0012]
According to the above configuration, even when the clutch and the parking brake device are provided side by side on the intermediate shaft of the reduction gear mechanism, the stationary brake member of the parking brake device can be slightly rotated together with the intermediate shaft when the clutch is engaged, The clutch unevenness position between the two gears provided on the intermediate shaft can be easily matched, and the clutch can be easily engaged and disengaged. Further, since the urging means for urging the fixed-side braking member toward the rotation direction when the vehicle moves forward is provided, the rotation of the fixed-side braking member during traveling is prevented, and noise due to rattling of the fixed-side braking member is prevented. Is prevented from occurring.
[0013]
According to the parking brake device for a small electric vehicle according to the present invention, the rotating brake member is a brake drum, and the stationary brake member is provided with a pair of brake shoes on a brake panel. The brake shoe is configured to be a drum brake type that brakes rotation of the brake drum by expanding the brake shoe inside the brake drum and frictionally engaging the brake shoe with the inner peripheral surface of the brake drum.
[0014]
Thus, if the fixed braking member is a brake panel of the drum brake, the braking reaction force applied at the time of braking is received by a durable structure as compared with the case where the other portion is a fixed braking member. The durability is improved, and the structure is simplified and the productivity is improved.
[0015]
Furthermore, the parking brake device for a small electric vehicle according to the present invention includes a secondary drive gear having a meshing clutch with the primary driven gear, and a secondary driven gear meshing with the secondary drive gear. Is formed of a helical gear, the tooth surface strength of the secondary drive gear on the small gear side can be particularly improved and the meshing noise can be reduced.
[0016]
In the parking brake device for a small electric vehicle according to the present invention, the outer peripheral portion of the brake panel is fastened to the casing with a plurality of fastening members, and is formed on the outer peripheral portion of the brake panel. The fastening member insertion hole is formed in the shape of a long hole extending in the circumferential direction, and the fastening member has a neck portion slightly below the thickness of the brake panel so that the fastening force of each fastening member is not directly applied to the brake panel. Since the long spacer part is formed, the brake panel is fixed in a floating state, and the brake shoe is not misaligned with the brake drum when the brake is operated. improves.
[0017]
According to a fifth aspect of the present invention, there is provided a parking brake device for a small electric vehicle, wherein the fitting is provided between the casing and the brake panel so as to be relatively rotatable and concentric between the two members. Since the coupling means is provided, the intermediate shaft of the reduction gear mechanism and the brake panel are kept concentric even though the brake panel can be slightly rotated with respect to the casing. Accuracy is improved.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 is a left front perspective view of an electric passenger cart as an example of a small electric vehicle to which an embodiment of the present invention is applied, and FIG. 2 is a plan view thereof.
[0020]
This electric passenger cart 1 is a single rider, and a pair of left and right front wheels 3 and rear wheels 4 are arranged at the four corners of the vehicle body 2, and a leg shield 5 is erected on the front portion of the vehicle body 1. 3 is provided. A handle bar 6 for steering 3 is provided, an operation panel 7 and an accelerator lever 8 are provided at the center of the handle bar 6, a rear body 9 is provided at the rear of the vehicle body 1, and a seating seat 10 is provided thereon. In addition, a low floor type footrest floor 11 is provided between the leg shield 5 and the rear body 9.
[0021]
A pair of left and right batteries 14 and a controller 15 are installed inside the rear body 9 and a power unit 16 is provided. As shown in an enlarged view in FIG. 3, the power unit 16 includes a reduction gear mechanism 19, a differential gear mechanism 20, and an electromagnetic brake device 21 for braking inside a metal casing 18. The electric motor 22 is fixed, axle pipes 24 and 25 are fixed to the left and right side surfaces of the rearmost portion of the casing 18, and axles 26 and 27 are axially supported therein.
[0022]
The left and right rear wheels 4 are fixed to both ends of axles 26 and 27, and the front ends of a pair of left and right trailing arms 28 provided at the outer ends of the axle pipes 24 and 25 are connected to a vehicle body frame (not shown) by a pivot shaft 29. The power unit 16 and the rear wheel 4 are rotatable around the pivot shaft 29.
[0023]
The electric motor 22 is fixed with a bolt 32 on the left side of the foremost part of the casing 18 in a lateral orientation so that the output shaft 31 extends along the vehicle width direction. The output shaft 31 projects from the right end of the electric motor 22. A speed sensor 33 and the like are provided at the left end.
[0024]
On the other hand, as shown in an enlarged view in FIG. 4, the input shaft 35 of the reduction gear mechanism 19 is pivotally supported by the bearings 36 and 37 at the foremost portion in the casing 18 and aligned with the output shaft 31 of the electric motor 22. The right end of the output shaft 31 and the left end of the input shaft 35 are coupled together in a rotating manner through a resin coupling member 38 (see FIG. 3).
[0025]
A primary drive gear (pinion gear) 45 having a small number of teeth is engraved near the right end of the input shaft 35, and an intermediate shaft 46 is supported in parallel behind the input shaft 35 and provided at the left end of the intermediate shaft 46. The primary driven gear 47 having a large number of teeth meshes with the primary drive gear 45, and the secondary drive gear 48 having a small number of teeth provided on the right side of the primary driven gear 47 is connected to the differential gear mechanism 20 and has a large number of secondary driven gears. 49, two drive bevel gears 50 provided on the secondary driven gear 49 are engaged with a driven bevel gear 51 provided on the inner ends of the axles 26 and 27.
[0026]
In many cases, the secondary drive gear 48 and the secondary driven gear 49 are helical gears for the purpose of improving the tooth surface strength and reducing the meshing noise.
[0027]
The reduction gear mechanism 19 is a gear train that includes an input shaft 35, a primary drive gear 45, an intermediate shaft 46, a primary driven gear 47, a secondary drive gear 48, and a secondary driven gear 49.
[0028]
The electric motor 22 is activated by rotating the accelerator lever 8, and its output is decelerated by the reduction gear mechanism 19 and then transmitted to the rear wheel 4 as the driving wheel via the differential gear mechanism 20 to be electrically operated. The passenger cart 1 is driven. The rear wheel 4 and the power unit 16 as a whole rotate up and down about the pivot shaft 29 due to the unevenness of the road surface during traveling, and the shock is absorbed. The vertical movement of the rear wheel 4 and the power unit 16 is buffered and restored by a rear cushion unit (not shown).
[0029]
On the other hand, the electromagnetic brake device 21 is mounted on the outer periphery of the intermediate portion of the input shaft 35 so as to be positioned between the electric motor 22 and the reduction gear mechanism 19, and at the same time the accelerator lever 8 is released, The rotation is braked, whereby the rotation of the rotating member from the input shaft 35 to the rear wheel 4 is braked, and the electric riding cart 1 is decelerated to stop.
[0030]
The primary driven gear 47 is provided rotatably with respect to the intermediate shaft 46 and immovable in the axial direction, and the secondary drive gear 48 is provided integrally with the intermediate shaft 46 by spline fitting and is slidable in the axial direction. A meshing clutch 55 is provided between the secondary drive gear 48 and the secondary drive gear 48.
[0031]
The clutch 55 includes a clutch recess 56 formed on a side surface of the primary driven gear 47 facing the secondary drive gear 48 side, and a tooth end of the secondary drive gear 48 facing the primary driven gear 47 side. The secondary drive gear 48 is always urged toward the primary driven gear 47 side by the clutch spring 58, whereby normally the tooth end of the secondary drive gear 48 is engaged with the clutch recess 56 of the primary driven gear 47 and the clutch 55 is connected. The gears 47 and 48 are kept in rotation and the output of the electric motor 22 is transmitted to the rear wheel 4 side without being cut off.
[0032]
As shown in FIGS. 4 to 6, a clutch operating shaft 60 is pivotally supported on the casing 18, and a clutch lever 61 and a return spring 62 are provided at the outer end of the clutch operating shaft 60. A release fork 63 (see FIG. 4) is mounted on the part. The release fork 63 is rotatably engaged with a fork groove 64 formed at the outer end of the secondary drive gear 48. The clutch lever 61 is linked to a clutch operation mechanism (not shown) via a wire cable 65.
[0033]
When manually driving the electric passenger cart 1, the clutch operating mechanism is operated to pull the clutch lever 61 via the wire cable 65. As a result, the clutch operating shaft 60 rotates, and the release fork 63 slides the secondary drive gear 48 away from the primary driven gear 47 against the urging force of the clutch spring 58 by the action of a cam mechanism (not shown). The bond is released.
[0034]
For this reason, the primary driven gear 47 is rotatable with respect to the intermediate shaft 46, and the power transmission system between the electric motor 22 and the rear wheel 4 whose rotation is braked by the action of the electromagnetic brake device 21 when the accelerator is OFF is cut off. The electric riding cart 1 can be pushed by a light force without trying to reversely drive the electric motor 22.
[0035]
As shown in FIGS. 3 to 6, a parking brake device 70 is provided at the right end portion of the intermediate shaft 46. The parking brake device 70 is configured as a drum brake, and includes a brake drum 71, a brake panel 72, and a pair of brake shoes 73 provided on the brake panel 72. The brake drum 71 functions as a rotation-side braking member described in claim 1 of the claims, and the brake panel 72 and the brake shoe 73 also function as a fixed-side braking member described in claim 1.
[0036]
The brake drum 71 formed in a bowl shape is accommodated in a brake device accommodating portion 18a formed in the right side surface of the casing 18, and a drum boss 75 fixed to the center portion of the brake drum 71 is spline fitted to the intermediate shaft 46. The rotation is integrated with the intermediate shaft 46, and the position in the axial direction is determined by a circular clip 76.
[0037]
On the other hand, the brake panel 72 is formed in a flat plate shape and is attached so as to close the opening of the brake device housing portion 18a, and four bolts are formed in the four fastening member insertion holes 78 formed in the outer peripheral portion thereof. The fastening members 79 are inserted, and each fastening member 79 is fastened to the brake device housing portion 18a (see FIGS. 5 and 6).
[0038]
Since each fastening member 79 is formed with a spacer portion 79 a slightly longer than the thickness of the brake panel 72 in the lower part of the neck, the fastening force of each fastening member 79 is not directly applied to the brake panel 72. However, the backlash in the thickness direction of the brake panel 72 is minimized.
[0039]
The brake panel 72 is provided with a support shaft 81 (see FIGS. 4 and 5) that holds one end of two brake shoes 73 and a brake cam shaft 82 that extends the brake shoe 73 by pressing the other end of the brake shoe 73. The cam lever 83 is fixed to the outer end of the brake cam shaft 82. The cam lever 83 is linked to a brake lever 84 provided on the handle bar 6 via a wire cable (not shown).
[0040]
When the brake lever 84 is operated, the cam lever 83 and the brake cam shaft 82 rotate, and the two brake shoes 73 expand inside the brake drum 71 and frictionally engage with the inner peripheral surface of the brake drum 71. And the rotation of the intermediate shaft 46 is braked. For this reason, the rear wheel 4 cannot be rotated, and the electric riding cart 1 is parked and braked.
[0041]
The four fastening member insertion holes 78 provided in the outer peripheral portion of the brake panel 72 are formed in the shape of elongated holes extending in the circumferential direction, and the spacer portions 79a are formed in the four fastening members 79 as described above, and are fastened. Since the fastening force of the member 79 is not directly applied to the brake panel 72, the brake panel 72 and the brake shoe 73 can rotate by a predetermined minute angle with respect to the brake device housing portion 18a. The rotation angle is determined by the length of the fastening member insertion hole 78, and is set to 4 ° to 6 °, for example.
[0042]
Further, a tension spring 88 is stretched between a spring arm 86 (see FIG. 5) provided at the front upper part of the brake panel 72 and a spring bolt 87 fastened to the rear upper part of the casing 18. The spring arm 86, the spring bolt 87, and the tension spring 88 function as the urging means described in claim 1 . The tension spring 88 urges the brake panel 72 to rotate backward , that is, the fixed brake member in the rotational direction when the vehicle moves forward .
[0043]
When the clutch 55 is operated to be connected, the tooth end of the secondary drive gear 48 is not easily engaged with the clutch recess 56 of the primary driven gear 47 unless the secondary drive gear 48 is slightly rotated. Here, since the brake panel 72 and the brake shoe 73 can be slightly rotated with respect to the brake device housing portion 18a, even if the rotation of the intermediate shaft 46 and the secondary drive gear 48 is braked by the parking brake device 70, the electric riding cart If 1 is swung back and forth, the secondary drive gear 48 and the intermediate shaft 46 can be slightly rotated to easily connect the clutch 55.
[0044]
In addition, when the secondary drive gear 48 is a helical gear, the meshing of the clutch 55 is not released unless the secondary drive gear 48 rotates slightly not only when the clutch 55 is connected but also when the connection is released. 48 rotates together with the intermediate shaft 46, the brake panel 72, and the brake shoe 73 to facilitate the release of the clutch 55.
[0045]
As described above, according to the parking brake device 70 according to the present invention, even when the meshing clutch 55 and the parking brake device 70 are provided on the intermediate shaft 46, the intermittent operation of the clutch 55 can be performed very easily. Can do.
[0046]
The parking brake device 70 is a drum brake type, and the portions that slightly rotate with respect to the brake device housing portion 18a are the brake panel 72 and the brake shoe 73, so that the braking reaction force applied during parking braking is very strong. Thus, the durability of the parking brake device 70 can be improved, and the structure of the parking brake device 70 can be simplified to improve the manufacturability.
[0047]
Since the brake panel 72 and the brake shoe 73 are urged in the direction of rotating backward by the tension spring 88, the brake panel 72 and the brake shoe 73 do not rattle when the electric passenger cart 1 travels, and vibration noise is generated. Is also prevented.
[0048]
Since the four fastening member insertion holes 78 formed in the outer peripheral portion of the brake panel 72 are formed in a long hole shape extending in the circumferential direction, the brake panel 72 is fixed in a floating manner to the brake device housing portion 18a. Accordingly, the brake shoe 73 can be prevented from being misaligned with respect to the brake drum 71 when the parking brake is operated, and the braking force can be improved by making the contact between the brake shoe 73 and the brake drum 71 uniform.
[0049]
Incidentally, the brake panel 72 may have a simple lid-like structure that closes the opening of the brake device accommodating portion 18a as shown in FIG. 6, but for example, protrudes toward the inner surface side of the brake panel 72 as shown in FIG. A shape 90 is provided, and the convex shape 90 is closely fitted to a stepped shape 91 provided on the inner periphery of the opening of the brake device housing portion 18a, so that relative rotation between the brake device housing portion 18a and the brake panel 72 is possible. You may make it the structure maintained in a concentric state.
[0050]
Thereby, although the brake panel 72 is rotatable with respect to the brake device housing portion 18a, the intermediate shaft 46 and the brake panel 72 can be kept concentric, and the parking brake device 70 The accuracy can be improved to increase braking force, durability, and the like. The convex shape 90 and the stepped shape 91 function as fitting means described in claim 5 of the claims. The convex shape 90 may be provided integrally with the brake panel 72 or may be provided separately.
[0051]
Further, as shown in FIG. 8, a sealing member 92 made of an elastic material is interposed between the brake device housing portion 18a and the periphery of the opening of the brake panel 72, thereby improving the waterproof and dustproof properties, and the parking brake device 70. Can maintain good soundness.
[0052]
【The invention's effect】
As described above, according to the parking brake device for a small electric vehicle according to the present invention, even when the clutch and the parking brake device are provided on the intermediate shaft of the reduction gear mechanism, the clutch is intermittently operated. In addition, the durability and braking force of the parking brake device can be increased, the structure can be simplified to facilitate manufacture, and noise can be prevented and accuracy can be improved.
[Brief description of the drawings]
FIG. 1 is a left front perspective view of an electric passenger cart as an example of a small electric vehicle to which an embodiment of the present invention is applied.
FIG. 2 is a plan view of an electric passenger cart.
FIG. 3 is an enlarged cross-sectional view of a power unit.
4 is an enlarged view of a portion IV in FIG. 3;
5 is a right side view of a power unit showing one embodiment of the present invention as viewed in the direction of arrow V in FIG. 4;
6 is a cross-sectional view developed along the line VI-VI in FIG. 5;
FIG. 7 is a cross-sectional view showing an example in which fitting means is provided between a brake device housing portion and a brake panel.
FIG. 8 is a cross-sectional view showing an example in which a seal member is interposed between a brake device housing portion and a brake panel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric riding cart 4 which is an example of a small electric vehicle 4 Rear wheel 18 which is a driving wheel Casing 19 Reduction gear mechanism 22 Electric motor 46 Intermediate shaft 70 Parking brake device 71 Brake drum 72 which is a rotation side braking member 72 Fixed side braking member A certain brake panel 73 A brake shoe 78 which is a fixed braking member A fastening member insertion hole 79 A fastening member 86 A spring arm 87 which constitutes an urging means A spring bolt 88 which constitutes an urging means A tension spring 90 which constitutes an urging means Convex shape 91 as means Means step shape 92 as fitting means Seal member

Claims (5)

An electric motor, a reduction gear mechanism that decelerates the output of the electric motor and transmits it to the drive wheel side, an electromagnetic brake device that brakes rotation of the input shaft of the reduction gear mechanism by operating an accelerator lever, and a reduction gear mechanism A power unit comprising a parking brake device provided at the end of the intermediate shaft for braking the rotation of the intermediate shaft and a rear wheel axle that is rotatably supported with the rear wheels fixed to the left and right ends. In a small electric vehicle connected to a vehicle body frame via a pivot shaft, the reduction gear mechanism includes an input shaft, a primary drive gear, an intermediate shaft, a primary driven gear, a secondary drive gear, and a secondary driven gear. The differential gear mechanism and the electromagnetic brake device are housed inside the casing of the power unit, and the input shaft is the electric motor. The primary drive gear is engraved with the output shaft and the primary driven gear meshes with the primary drive gear and is rotatable with respect to the intermediate shaft supported in parallel with the input shaft and immovable in the axial direction. The secondary drive gear is provided so as to rotate integrally with the intermediate shaft and slidably in the axial direction, and has a meshing clutch with the primary driven gear, and the secondary driven gear is engaged with the secondary drive gear. The parking brake device is provided with a dynamic gear mechanism, and includes a rotation-side braking member provided integrally with the intermediate shaft of the reduction gear mechanism, and a fixed-side braking member provided on a casing side in which the reduction gear mechanism is accommodated. comprising a said casings to the fixed-side braking member With only installed rotatably predetermined small angle axis around the intermediate shaft, a biasing means for biasing the fixed-side braking member toward the rotation direction when the vehicle travels forward provided for, the parking When the engagement state of the meshing clutch is poor in the braking state by the brake device, a rotational force is applied from the outside to the secondary drive gear via the secondary driven gear, and the secondary drive together with the rotation side braking member and the stationary side braking member. A parking brake device for a small electric vehicle, characterized in that the gear is rotated by the predetermined minute angle to facilitate connection and release of the meshing clutch .   The rotation-side braking member is a brake drum, the fixed-side braking member is provided with a pair of brake shoes on a brake panel, and the brake shoes are expanded inside the brake drum so that friction is applied to the inner peripheral surface of the brake drum. 2. The parking brake device for a small electric vehicle according to claim 1, wherein the parking brake device is a drum brake type in which the rotation of the brake drum is braked by combining them. The parking brake device for a small electric vehicle according to claim 1, wherein a secondary drive gear having a meshing clutch between the primary driven gear and a secondary driven gear meshing with the secondary drive gear are formed by a helical gear .   The outer peripheral portion of the brake panel is fastened to the casing with a plurality of fastening members, and the fastening member insertion hole formed in the outer peripheral portion of the brake panel is formed in a long hole shape extending in the circumferential direction, and each fastening member 3. A parking brake for a small electric vehicle according to claim 2, wherein a spacer portion slightly longer than the thickness of the brake panel is formed in a lower neck portion of the fastening member so that the fastening force is not directly applied to the brake panel. apparatus. 5. The small electric vehicle according to claim 2, wherein fitting means is provided between the casing and the brake panel so as to keep both members relatively rotatable and concentric. Parking brake device.

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