JP2001171363A - Traveling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traveling vehicle capable of improving traveling stability. SOLUTION: In a golf cart 1, a front seat mount 3 is provided on a front part of a main frame 2 supporting a body lower part and a rear cowl 4 is provided on a rear part. The front seat mount 3 is provided so as to cover a front wheel 37 used as a wheel for steering and the rear cowl 4 is provided so as to cover a rear wheel 38 used as a driving wheel. A compartment including a front step 32 is formed in front of the front seat mount 3 between a front cowl 33. A bag carrier 44 is provided behind the rear cowl 4 housing an engine, a low voltage battery 53, or the like inside for placing a golf bag thereon. A high voltage battery 73 is provided below the bag carrier 44.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling vehicle provided with a plurality of batteries having different rated voltages.

[0002]

2. Description of the Related Art Heretofore, golf carts used in golf courses have been known as a type that runs on an internal combustion engine such as a gasoline engine and a type that runs on an electric motor (a so-called electric vehicle). I have.

Each of these golf carts uses a battery having a rated voltage of 12 V, which is generally used in automobiles. In recent years, vehicles equipped with a system equipped with a hybrid engine have been proposed.
Hybrid engines of a series hybrid engine type and a parallel hybrid engine type are known, and a vehicle equipped with a series hybrid engine generates power by an engine generator, charges a battery, and converts the charged battery into a battery. The vehicle is driven by the electric motor supplied with the electric power. Since the electric motor is required to generate a large torque in order to be a driving source for traveling, a relatively large electric motor is used, and a battery for supplying electric power to the electric motor has a large rated voltage and a large size. Things are used.

[0004] In addition, an automobile equipped with a parallel hybrid engine can run using both an internal combustion engine such as a gasoline engine or a diesel engine and an electric motor as driving sources for driving. Also in an automobile equipped with a parallel hybrid engine, an electric motor serving as a driving source for traveling needs a relatively large torque, and a battery for supplying electric power to the electric motor is also large. I have.

[0005] Like an automobile employing these hybrid systems, a battery for driving an electric motor serving as a driving source for traveling is large in size. To a controller that performs the control, sensors used for control, and various electric components provided in the instrument panel and the like, power is supplied from a battery having a lower rated voltage than the battery for the electric motor. .

Conventionally, a large battery as described above has
Various devices mounted on a vehicle including a battery, and a boarding device, which are arranged along the floor of a vehicle body of a vehicle, whereby a relatively large battery is disposed between a front wheel and a rear wheel. The weight distribution of the athlete is adjusted appropriately to balance the weight.

[0007]

However, unlike a general automobile, a front cowl, such as a golf cart, and a rear wheel serving as a drive wheel are provided, and a rear cowl is arranged so as to cover the rear wheel. In a traveling vehicle in which a transport carrier is disposed further rearward, a traveling drive source for driving rear wheels, which are driving wheels, is disposed in a rear cowl.

Therefore, in such a traveling vehicle, when the large battery as described above is arranged in the vicinity of the rear cowl, there is no place for arranging the electric motor or the engine serving as a driving source for traveling, and the arrangement is practically difficult. It is.

In addition, when a large battery is arranged along the floor, the floor is located above the floor, so that the center of gravity becomes high, and the running stability of the running vehicle is lost.
Alternatively, in the case of a vehicle such as a golf cart that is open on the side, there is a problem that the passenger feels anxiety when traveling.

[0010] An object of the present invention is to provide a traveling vehicle capable of improving traveling stability.

[0011]

According to a first aspect of the present invention, there is provided a vehicle having a front cowl and a rear wheel serving as a driving wheel, wherein a rear cowl is disposed so as to cover the rear wheel. In a traveling vehicle having a transport carrier disposed rearward thereof, a first battery for supplying power to a first load mounted on the traveling vehicle is disposed in the rear cowl, and the traveling vehicle is disposed on the transport carrier side. And that a second battery that supplies power to a second load that consumes more power than the first load is arranged.

Therefore, according to the first aspect of the present invention, the second battery is disposed on the side of the transport carrier behind the rear cowl that covers the rear wheels (drive wheels). There is no loss of running stability.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention applied to a golf cart will be described below with reference to the drawings. FIG. 1 is a perspective view showing a multi-person riding (five-seater in this embodiment) type golf cart having front and rear seats, and FIG. 2 is a side view. In a golf cart 1 as a traveling vehicle, a front seat base 3 is provided at a front portion of a main frame 2 that supports a lower portion of a vehicle body, and a rear cowl 4 is provided at a rear portion.
A driver's seat 11 and a passenger's seat 12 are provided on the upper part of the front seat base 3 so as to be divided into left and right sides, and a console 1 is provided between the driver's seat 11 and the passenger's seat 12.
3 are provided. On the other hand, on the upper part of the rear cowl 4, a horizontally long rear seat 15 that can be seated by three persons in the left-right direction (the left-right direction is sometimes referred to as the vehicle width direction in the present embodiment) is provided via the rear seat stand 14. The golf cart 1 is designed for five people.

At the rear of the driver's seat 11 and the passenger's seat 12, a backrest 17 is provided via a seat stay 16, respectively. On the other hand, a horizontally long backrest 19 is provided at the rear of the rear seat 15 via a pair of seat stays 18. Assist bars 20, 21, and 22 are provided outside the driver seat 11, the passenger seat 12, and the rear seat 15, respectively.

Between the front seat base 3 and the rear cowl 4, a rear step 31 for a person sitting on the rear seat 15 is provided.
Is provided. On the other hand, in front of the front seat base 3, front steps 32 for the driver sitting on the driver seat 11 and the passenger sitting on the passenger seat 12 (in FIG.
(Only the front step 32 for a person sitting on the floor is shown). The front cowl 3 is located at the front end of the front step 32.
3 are provided integrally. A steering mechanism 34 such as a steering wheel is provided in front of the driver seat 11 so as to protrude from the front cowl 33. A brake pedal 35 and an accelerator pedal 36 are provided in front of the driver seat 11 under the feet. Have been. A pair of left and right front wheels 37 (only the left front wheel 37 is shown in FIG. 1) is suspended below the front seat base 3, and a pair of left and right driving wheels, which serve as drive wheels, are respectively provided below the rear cowl 4. Rear wheel 3
8 (only the left rear wheel 38 is shown in FIG. 1). That is, the rear cowl 4 is provided so as to cover each rear wheel 38.

A pair of front pillars 41 extend upward from above the front cowl 33. On the other hand, a pair of rear pillars 42 (only one side is shown in FIG. 1) is extended above the backrest 19 of the rear seat 15. A roof 43 is supported between upper ends of the front pillar 41 and the rear pillar 42. Behind the rear cowl 4, a bag carrier 44 as a carrier for carrying is extended obliquely upward, and a golf bag can be placed thereon. The bag carrier 44 is formed integrally with the rear pillar 42, and
It is connected to. This bag carrier 44 is provided for each rear wheel 3
8 is provided at a position rearward. A pair of storage cases 45 that can store umbrellas, putters, and the like are provided on both left and right sides of the bag carrier 44.

As described above, the golf cart 1 of the present embodiment
The front seat base 3 is provided so as to cover the suspension portion of each front wheel 37, and the driver's seat 11 and the passenger seat 1 are provided thereon.
2 are provided. In front of the front seat base 3, a living room including a front step 32 is formed between the front cowl 33 and the front cowl 33, and the golf cart 1 is a cab-over type having a living room in front of each front wheel 37. ing. Therefore, as compared with a golf cart of a type that does not have a room on the front side of each front wheel (in this case, there is no front step 32 as in the present embodiment), the weight (front side) of each front wheel 37 ( (Including the weight of the front step 32).

Next, the drive system of the golf cart 1 is shown in FIG.
This will be described with reference to FIG. FIG. 3 is a side view showing a configuration of the main frame 2, and FIG. A sub-frame 51 is fixed to a central portion of the main frame 2 in a longitudinal direction (in the present embodiment, the longitudinal direction is sometimes referred to as a front-rear direction).
It extends rearward. A bracket 52 is fixed to a front portion of the sub frame 51, and on the bracket 52,
On the left side, a low-voltage battery 53 as a first battery
However, storage cases 54 are placed and fixed on the right side, respectively. The rated voltage of the low-voltage battery 53 of this embodiment is D
C12V. In the storage case 54, a charger 55, a generator 56, an engine 57, a muffler 58
Are arranged.

In the storage case 54, the engine 5
7, a starter motor (not shown) is provided, and each pulley (both not shown) fixed to the motor shaft of the starter motor and the output shaft of the engine 57, and a V belt (not shown) wound between the pulleys. No), the output from the starter motor is transmitted to the engine 57. Electric power is supplied to the starter motor from the low-voltage battery 53. Generator 56
Is a rotor 59 having N-pole and S-pole permanent magnets connected to the output shaft of the engine 57 and rotating integrally with the output shaft.
(See FIG. 6) Stator 60 provided with three-phase star winding
(See FIG. 7) and the like, and the rotor 59 is rotated based on the output from the engine 57, so that power can be generated. The charger 55 includes an AC / DC converter, and is configured to convert (rectify) an alternating current generated by the generator 56 into a direct current and charge the low-voltage battery 53 and a high-voltage battery 73 described later. .

An intake port (not shown) is formed in the lower part of the front end of the storage case 54 so as to be open to the outside and to take in external air. Provided air cleaner,
It is configured to be able to be introduced into an intake port of the engine 57 via an intake manifold (neither is shown). In the middle of the intake manifold, a carburetor (not shown) for mixing the intake air with fuel and introducing an air-fuel mixture to the engine 57 is provided.

An exhaust manifold (not shown) connected to an exhaust port of an engine 57 is provided at one end of a muffler 58 located at the rearmost side in the storage case 54.
And an exhaust rear pipe (not shown) opened to the outside of the storage case 54 is connected to the other end.

At the center of the rear end of the sub-frame 51,
A transmission case 61 containing a reduction gear and a differential gear mechanism (not shown) is fixed, and a rear axle 62 for the rear wheel 38 is provided below the transmission case 61. The rear end portions of the left and right sides of the main frame 2 rise obliquely upward and extend.
A rear sub-frame 66 extends from the rear.
An electric motor 67 as a second load is fixed to the rear sub-frame 66. The electric motor 67 is a DC motor having a built-in drive circuit 68 (see FIG. 5).
The output shaft 69 is rotated by drive control by the drive circuit 68, and the rotation output can be transmitted to a gear mechanism in the transmission case 61. The storage case 5
4, the low-voltage battery 53, the transmission case 61, and the electric motor 67 are housed in the rear cowl 4, as shown in FIG.

A pair of bag carrier frames 71 are fixed to the left and right rear ends of the main frame 2 and the rear end of the rear subframe 66, and the bag carrier frames 71 extend rearward. A battery bracket 72 is fixed between the pair of bag carrier frames 71, and a high-voltage battery 73 as a second battery is mounted and fixed on the battery bracket 72. The rated voltage of the high-voltage battery 73 of the present embodiment is set to DC48V. This high-voltage battery 73 is used for the bag carrier 4.
4 is provided below the golf cart 1.
Is located at a position where maintenance is possible from behind.

As described above, the golf cart 1 of the present embodiment
Are two batteries 5 having different rated voltages from each other.
3 and 73, and an engine 57 and an electric motor 67. Then, based on the output from the engine 57, an AC is generated by the generator 56, and the AC is converted into a DC by the charger 55 to charge the low-voltage battery 53 and the high-voltage battery 73. The golf cart 1 drives various electric components (ICs such as the controller 75, a starter motor, etc.) other than the electric motor 67 with the electric power from the low-voltage battery 53, and also drives the electric motor 6 with the electric power from the high-voltage battery 73.
7 is driven and each rear wheel 38 is driven by a driving force of an electric motor 67 via a gear mechanism in a transmission case 61.

Next, a series hybrid system in the golf cart 1 will be described with reference to FIG. In the series hybrid system such as the golf cart 1 of the present embodiment, first, the controller 75 controls the engine 57.
Is performed, and the engine 57 is driven under the condition of the highest efficiency. Then, the generator 56 generates an alternating current based on the output from the engine 57, and the alternating current is input to the charger 55. The charger 55 rectifies the input AC and converts it into DC, and charges the low-voltage battery 53 and the high-voltage battery 73.

Here, the charger 55 is a low-voltage battery 53
In order to make the output voltage (rated voltage) of DC into 12 V DC, the input voltage of a value larger than DC 12 V (DC 14 V in this embodiment) is applied to the low voltage battery 53 in consideration of the voltage drop in the low voltage battery 53. Apply to charge. On the other hand, the charger 55 sets the output voltage (rated voltage) of the high-voltage battery 73 to DC48V in consideration of the voltage drop in the high-voltage battery 73,
A value larger than C48V (DC56V in this embodiment)
Is applied to apply the input voltage.

The electric power of the low-voltage battery 53 is supplied to various electric components (constituting a first load and including a controller 75) other than the electric motor 67. That is, in the present embodiment, various electric components (including the controller 75) other than the electric motor 67 are loaded with a load (I
C, starter motor, etc.). On the other hand, the electric power of the high-voltage battery 73 is supplied to a drive circuit 68 built in the electric motor 67, and the electric motor 67 is driven by the drive circuit 68 based on the electric power, and the rotation output of the output shaft 69 is transmitted to the transmission case 61. Is transmitted to
Then, after being reduced by the reduction gear built in the transmission case 61, the rear axle 62 is driven via the differential gear mechanism, and each rear wheel 38 is driven. That is, the golf cart 1 of the present embodiment is a rear-wheel drive type, and each front wheel 37 is a steering wheel that is steered by operating the steering mechanism 34 (steering wheel operation).

Next, a method of charging the batteries 53 and 73 will be described with reference to FIGS. FIG. 6 is a schematic block diagram for explaining a method of charging each of the batteries 53 and 73, and FIG. 7 is a schematic electric circuit diagram showing a configuration of the charger 55.

For example, when the low-voltage battery 53 and the high-voltage battery 73 have been discharged to some extent due to, for example, the end of one round of golf play, it is necessary to charge the batteries 53, 73 to compensate for the discharged amount. is there. In such a case, first, the high voltage battery 73 is
Control of the number of revolutions of the engine 57 according to the discharge amount of the engine 57. That is, when the discharge amount of the high-voltage battery 73 is large, the rotation speed of the engine 57 is increased, and when the discharge amount is small, the rotation speed of the engine 57 is reduced. And engine 5
7 is driven at a rotational speed corresponding to the amount of discharge of the high-voltage battery 73, and the generator 56 generates an alternating current based on the output from the engine 57.

The stator 60 of the generator 56 is provided with a three-phase star winding (see FIG. 7), and each phase is formed by connecting a first winding 60a and a second winding 60b in series. Have been. That is, the generator 56 of the present embodiment is a three-phase AC generator. In FIG. 6, the first winding 60a and the second winding 60b for one phase are shown for convenience of explanation.

The winding resistance ratio between the first winding 60a and the second winding 60b is 3: 1. One end of the first winding 60a is connected to the first input terminal 55a of the charger 55, one end of the second winding 60b is connected to the third input terminal 55c of the charger 55, and the first winding 60a and the second The intermediate point of the winding 60b (the other end of each of the windings 60a, 60b) is connected to the second input terminal 55b of the charger 55. Therefore, the rotor 59 of the generator 56 is connected to the stator 60 based on the output from the engine 57.
When rotated in this manner, three-phase alternating currents having phases shifted by 2π / 3 are generated in the three-phase windings 60a and 60b, respectively. A voltage is applied to the first to third input terminals 55a to 55c. In the present embodiment, the first and third input terminals 55
A 48-V three-phase AC voltage is applied between a and 55c, and a 12-V three-phase AC voltage is applied between the second and third input terminals 55b and 55c.

The charger 55 includes a first three-phase full-wave rectifier circuit S1 (including diodes D1 to D6) for performing full-wave rectification of 48-V three-phase AC and converting it to 48-V DC, and a 12-V system. A second three-phase full-wave rectifier circuit S2 (including diodes D7 to D12) that performs full-wave rectification of the three-phase alternating current and converts it into a 12V DC. First output terminal 55 of charger 55
d is connected to the + terminal of the high-voltage battery 73, the second output terminal 55e is connected to the + terminal of the low-voltage battery 53,
The third output terminal 55f is connected to the negative terminal of the high voltage battery 73 and the negative terminal of the low voltage battery 53. The charger 55 is connected between the first and third output terminals 55d and 55f.
An 8 V DC voltage (56 V DC in this embodiment) is output, and a 12 V DC voltage (14 V DC in this embodiment) is applied between the second and third output terminals 55 e and 55 f.
Is output. Then, 48
The charging is performed by supplying a charging current J1 corresponding to the DC voltage of the V system, and the charging is performed by supplying a charging current J2 corresponding to the DC voltage of the 12V system to the low-voltage battery 53.

Here, the load using the power of the high voltage battery 73 (the rated voltage is 48 V DC) is the electric motor 67, and the load using the power of the low voltage battery 53 (the rated voltage is 12 V DC) is other than the electric motor 67. (E.g., IC such as controller 75, starter motor, etc.). That is, when the golf cart 1 runs, the amount of discharge of the high-voltage battery 73 that supplies power to the electric motor 67, which is a load that consumes a large amount of power, increases, and the amount of power consumption is small and a substantially constant load is applied. Control IC
Low-voltage battery 5 that supplies power to the motor and starter motor
3, the amount of discharge is small.

Accordingly, in the present embodiment, in order to compensate for the discharge amount of the high-voltage battery 73, the controller 75 controls the rotation speed of the engine 57 in accordance with the discharge amount of the high-voltage battery 73, and based on the control, The charge current J1 flowing through the switch 73 is controlled. On the other hand, the low-voltage battery 53
Is not controlled in accordance with the amount of discharge of the low-voltage battery 53, but is not particularly controlled, and conforms to the rotation speed control of the engine 57. That is, in the 48V system, the high voltage battery 73 is charged by the current control method of controlling the charging current J1, and in the 12V system, the float charging method (the current control of the 48V system is not particularly controlled and the current control of the 48V system is performed). The low-voltage battery 53 is charged by a floating charging method.

The field coil FC in FIG. 7 is a coil wound around the rotor 59, and is supplied from the low-voltage battery 53 via the key switch KS to the field coil F.
By passing a field current through C, an initial external excitation can be performed. On the other hand, the voltage regulator VR is for adjusting the voltage by changing the field current to increase or decrease the excitation.
In addition, the constant voltage circuit T connected between the + terminal and the − terminal of the low voltage battery 53 includes a second and third output terminals 55e,
This is for stabilizing a 12 V DC voltage (DC 14 V in the present embodiment) output from between 55 f and flowing a charging current J 2 according to the voltage to the low-voltage battery 53.

Therefore, according to the present embodiment, the following effects can be obtained. (1) In the present embodiment, the high-voltage battery 73 is arranged on the bag carrier 44 side behind the rear cowl 4 that covers each rear wheel 38 (drive wheel). This high voltage battery 73
The rated voltage is larger than the low-voltage battery 53 and large in order to supply electric power to a relatively large electric motor 67 serving as a driving source for traveling. Therefore, since such a large and heavy high-voltage battery 73 is disposed below the bag carrier 44, the center of gravity does not increase, and the running stability of the golf cart 1 can be improved. In particular, since slippage is prevented during uphill traveling, traveling performance can be improved.

(2) In this embodiment, the high voltage battery 7
3 is provided below the bag carrier 44 at a position where maintenance can be performed from behind the golf cart 1. Therefore, for example, compared with the case where the high voltage battery 73 is provided in the rear cowl 4, there is no need to remove the rear cowl 4 and the like, and maintenance can be performed easily.
Further, since the high-voltage battery 73 is provided below the bag carrier 44 where nothing was originally used, effective use of space can be realized.

(3) In this embodiment, the bag carrier 4
A high-voltage battery 73 is provided below the electric motor 67 and the electric motor 67 to which electric power is supplied from the high-voltage battery 73 is disposed in the rear cowl 4 slightly ahead of the bag carrier 44. 67 can be reduced in length.

(4) In the present embodiment, the cab-over type golf cart 1 is provided with a living room including the front step 32 on the front side of each front wheel 37, so that there is a living room on the front side of each front wheel. Compared to no golf cart,
The weight (including the weight of the front step 32) on the front side of each front wheel 37 is heavier. Also, in the golf cart 1 of the present embodiment, since the high-voltage battery 73 is provided at a position behind each rear wheel 38, the weight of the portion behind each rear wheel 38 (the high-voltage battery 73 Weight (including weight). Therefore, the balance between the weight on the front side of each front wheel 37 and the weight on the part behind each rear wheel 38 is improved, and the stability during traveling can be improved.

Further, since the high-voltage battery 73 is disposed at the rear to increase the load on the rear, the friction coefficient of the rear axle 62 is increased, and the output of the electric motor 67 is efficiently increased for each rear wheel 3.
8 can be transmitted. Further, by providing the high-voltage battery 73 at the rear part, the burden load on the front part is reduced, and the steering wheel operation can be facilitated.

(5) In this embodiment, since the low-voltage battery 53 and the high-voltage battery 73 having different rated voltages can be simultaneously charged by the charger 55, separate charging is performed for each of the batteries 53, 73. The configuration of the charging means can be simplified as compared with the case where the charging means is provided.

(6) In the present embodiment, in consideration of the power consumption of the load, the high-voltage battery 73 having a large amount of discharge is charged by the current control method, and the low-voltage battery 53 having a small amount of discharge is charged. By performing float charging, overdischarge and overcharge of the low-voltage battery 53 and the high-voltage battery 73 can be prevented.

(7) In the present embodiment, when the generator 56 generates electric power based on the output of the engine 57, the electric power is charged to the low-voltage battery 53 and the high-voltage battery 73 by the charger 55, and the electric motor 67 Is the high voltage battery 73
Driven by the electric power supplied from the golf cart 1
Is run. In such a series hybrid traveling vehicle (golf cart 1), electric power can be supplied from the high-voltage battery 73 to the electric motor 67, and electric power is supplied from the low-voltage battery 53 to other electric components. be able to.

(8) In the present embodiment, the DC12 used in the traveling system and the control system in the conventional golf cart is used.
Since the low-voltage battery 53 capable of supplying power to the V-system load is mounted, the DC12V-system load (for example, an IC such as the controller 75, a starter motor, etc.) can be continuously employed. Parts can be shared. That is, the low-voltage battery 5 of the present embodiment
When a battery having another rated voltage (for example, DC 24 V) different from the rated voltage (DC 12 V) of the DC power supply 3 is mounted, an expensive DC-D that converts DC 24 V to DC 12 V is used.
A C converter is required, which increases the cost of the golf cart, but this is not the case in the present embodiment.

The above embodiment may be modified as follows. In the above embodiment, the invention is embodied in the series hybrid golf cart 1, but may be embodied in a traveling vehicle such as a parallel hybrid golf cart in which both the engine and the electric motor can drive the driving wheels.

In the above-described embodiment, the present invention is embodied in the golf cart 1 as a traveling vehicle, but may be embodied in a traveling vehicle other than a golf cart, for example, a buggy car, a go-kart, or the like.

In the above embodiment, as shown in FIG.
Although the low-voltage battery 53 is provided on the bracket 52, the low-voltage battery 53 may be provided at the next position. That is, as shown in FIGS. 3 and 4, a pair of left and right mounting frames 81, 8 having a reverse channel shape in cross section, which are fixedly provided at positions in front of the rising portions 65 in the main frame 2.
The low-voltage battery 53 may be provided in one of the two. Each of the mounting frames 81 and 82 projects outside the main frame 2. That is, FIG.
The low-voltage battery 53 may be provided on the left mounting frame 81 as shown by the dashed line, or the low-voltage battery 53 may be mounted on the right mounting frame 82 as shown by the two-dot chain line in FIG. It may be provided.

In this case, the bracket 52
Since there is no need to provide the low-voltage battery 53 on the upper side, another member other than the low-voltage battery 53 (for example, a maintenance tool such as a tester, etc.) may be provided at the position where the low-voltage battery 53 is provided in the above embodiment. Therefore, the space can be effectively used.

Next, technical ideas other than the invention described in the claims that can be understood from the above-described embodiment and other examples will be described below together with their effects. (B) a front seat base for supporting a front seat in each of the front and rear, and a rear cowl for supporting a rear seat, wherein a front seat base is arranged so as to cover the front wheels; The traveling vehicle according to claim 1, wherein a living room including a front step for a person sitting on the front seat is formed between the front cowl and the front cowl.

Therefore, according to the invention described in (a), since the cab-over type traveling vehicle has a living room including a front step on the front side of the front wheels, it is located on the front side of the front wheels. The weight on the front side (including the weight of the front step) is heavier than the front wheels compared to a traveling vehicle having no living room. Here, since the second battery is provided at a position behind the rear wheel, the weight of the portion behind the rear wheel (including the weight of the second battery) is increased. Therefore, the balance between the weight on the front side with respect to the front wheels and the weight on the rear side with respect to the rear wheels is improved, and the stability during traveling can be improved.

In the above embodiment, the driver seat 11 and the passenger seat 12 each constitute a front seat. (B) The first and second batteries have different rated voltages and are provided with a single charging means for charging the first and second batteries simultaneously. ).

Therefore, according to the invention described in (b), since the first and second batteries having different rated voltages can be simultaneously charged by the single charging means, the configuration of the charging means is reduced. Easy to do.

In the above embodiment, the charger 55 constitutes charging means. (C) The first battery is for a load having a small power consumption and a substantially constant load, the second battery is for a load having a large power consumption, and the charging means is a battery for the first battery. The battery is float charged and the second
The traveling vehicle according to (c), wherein the battery is charged by current control.

Therefore, according to the invention described in (c), the charging means charges the second battery for the load, which consumes a large amount of electric power, by current control according to the amount of the discharged electric power. The first battery for a load having a small consumption and a substantially constant load is charged by float charging.
Therefore, in consideration of the power consumption of the load, the second battery having a large amount of discharge is charged by current control, and the first battery having a small amount of discharge is float-charged. , Overdischarge and overcharge of the first and second batteries can be prevented.

In the above-described embodiment, various electric components (ICs such as the controller 75, starter motor, etc.) other than the electric motor 67 have a small power consumption and constitute a substantially constant load, and the electric motor 67 has a large power consumption. Configure the load.

(D) The traveling vehicle includes a generator driven by the engine, a charger for charging the first and second batteries with electric power generated by the generator, and a driving source for traveling. The first battery supplies power to an electric load other than the traveling drive source, and the second battery supplies power to the travel drive source. The traveling vehicle according to (c).

Therefore, according to the invention described in (d), when the generator driven by the engine generates power, the power is charged to the first and second batteries by the charger, and The drive source is driven by electric power supplied from the second battery, and the traveling vehicle travels. In such a hybrid traveling vehicle, electric power can be supplied from the second battery to the driving source for traveling, and electric power is supplied from the first battery to an electric load other than the driving source for traveling. be able to.

In the above embodiment, the electric motor 67 constitutes a drive source for traveling, and various electric components other than the electric motor 67 (ICs such as the controller 75, a starter motor, etc.) constitute electric loads other than the drive source for traveling. I do. The hybrid traveling vehicle includes a traveling vehicle such as the series hybrid golf cart 1 as in the above-described embodiment, and a traveling vehicle such as a parallel hybrid golf cart as in the above-described another example.

[0059]

According to the first aspect of the present invention, since the second battery is disposed on the side of the transport carrier behind the rear cowl that covers the rear wheels (drive wheels), the center of gravity does not increase. The traveling stability of the traveling vehicle can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a golf cart.

FIG. 2 is a side view showing a golf cart.

FIG. 3 is a side view showing the configuration of the main frame.

FIG. 4 is an essential part plan view showing a drive system and the like of the golf cart.

FIG. 5 is a schematic block diagram for explaining a series hybrid system.

FIG. 6 is a schematic block diagram for explaining a method of charging each battery.

FIG. 7 is a schematic electric circuit diagram showing a configuration of a charger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Golf cart as a traveling vehicle 4 ... Rear cowl, 37 ... Front wheel, 38 ... Rear wheel, 44 ... Bag carrier as a transport carrier 53 ... Low-voltage battery as a first battery 67 ... Second load 73. A high-voltage battery as a second battery.

Continued on the front page (72) Inventor Fumio Ishibashi 1-32 Chayamachi, Kita-ku, Osaka-shi, Osaka Yanmar Diesel F-term (reference) 5G003 AA07 BA02 CC02 CC06 CC08 DA04 FA06 GA02 GB02

Claims (1)

[Claims] 1. A traveling vehicle comprising a front wheel and a rear wheel serving as a drive wheel, a rear cowl arranged to cover the rear wheel, and a transportation carrier arranged rearward of the rear cowl. A first battery for supplying power to a first load mounted on the traveling vehicle is disposed, and a second load mounted on the traveling vehicle and having a larger power consumption than the first load is provided on the transport carrier side. A traveling vehicle comprising a second battery for supplying power to the vehicle.