JP2002104278A - Lean type motor tricycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lean type motor tricycle intending enhancement of comfortable ride by stopping unnecessary lean movement of a front body part by reactive driving force of a propeller shaft. SOLUTION: The rotational driving force of an engine 7 is transmitted to a rear wheel 26 through a propeller shaft 37, and a transmitting unit 23 is divided into two parts to form a front unit 27 and a rear unit 28. The front unit 27 is mounted to the front body part F so as to make it vertically rockable, and the rear unit 28 mounted to the front unit 27 so as to make it horizontally movable. The transmitting unit 23 is equipped with a braking device 41 to regulate the lean movement of the front body part, and a sensor to detect a throttle opening is provided in the intake device of an engine 7. Based on an amount of change in the opening of the throttle, the start of increase and decrease of the reactive driving force of propeller shaft 37 is detected by accelerating and reducing a speed. Thereby, the lean movement of the front body part F is regulated by operating the braking device 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lean type tricycle.

[0002]

2. Description of the Related Art For example, Japanese Patent Application Laid-Open No.
As shown in Japanese Patent No. 7937, a lean type in which one front wheel and two rear wheels are provided in a front vehicle portion and a rear vehicle portion, respectively, and both vehicle portions are connected to each other so as to be able to swing up, down, left and right. is there. In the motorcycle disclosed in the above publication, a power unit including an engine and a transmission is mounted on a rear vehicle portion located below a spring.

Further, as disclosed in, for example, Japanese Patent Application Laid-Open No. 58-67588, there is an automatic tricycle in which a power unit is provided on a front vehicle side and the final output of an engine is transmitted to a rear wheel of a rear vehicle via a propeller shaft. .

[0004]

However, if a heavy power unit is provided under the spring, the ability of the rear wheels to follow the road surface when traveling on rough roads is deteriorated, resulting in poor ride comfort. Further, when the size of the power unit is increased, the weight distribution between the front wheels and the rear wheels becomes unbalanced, and the riding comfort is further deteriorated. Furthermore, when the engine is a water-cooled type, the piping of the cooling water hose connecting the radiator cannot be fixed, and there are many restrictions on installation.

On the other hand, when transmitting the final output of the engine provided on the front vehicle side to the rear wheels via a propeller shaft,
Since the engine torque transmitted to the propeller shaft becomes a large torque after the final deceleration, the driver's sudden deceleration or acceleration operation causes the drive reaction force of the propeller shaft to rapidly increase or decrease, and the front vehicle section Unexpectedly, it causes a lean movement and makes the ride uncomfortable.

The present invention has been made in view of the above circumstances, and provides a lean-type tricycle in which unnecessary lean movement of a front vehicle portion due to a driving reaction force of a propeller shaft is stopped to improve riding comfort. The purpose is to do.

Another object of the present invention is to provide a lean-type three-wheeled vehicle in which the unsprung weight is reduced to improve ride comfort.

[0008]

According to the present invention, there is provided a lean-type three-wheeled motor vehicle for solving the above-mentioned problems.
As described in the above, in a lean-type automatic three-wheeled vehicle provided with one front wheel and two rear wheels in the front vehicle portion and the rear vehicle portion, respectively, and both vehicle portions are swingably connected to each other vertically and horizontally.
An engine is mounted on the front vehicle portion, and a transmission unit for holding the rear wheel is provided on the rear vehicle portion, and the transmission unit transmits the rotational driving force of the engine to the rear wheel via a propeller shaft. The front unit is divided into two parts to form a front unit and a rear unit.The front unit is attached to the front vehicle so as to be swingable in the vertical direction, and the rear unit is turned around the front unit in the left and right direction. The transmission unit is provided with a brake device that regulates the lean movement of the front vehicle portion, while the transmission unit is provided with a sensor that detects the opening degree of the throttle in the intake device of the engine. Operating the brake device to detect the start / decrease of the drive reaction force of the propeller shaft due to acceleration / deceleration based on the acceleration, thereby restricting the lean motion of the front vehicle section. A.

According to another aspect of the present invention, an engine is mounted on the front vehicle and the rear wheel is mounted on the rear vehicle. A transmission unit is provided for transmitting the rotational driving force of the engine to the rear wheel via a propeller shaft, and the transmission unit is divided into two parts, a front unit and a rear unit. Attaching the unit to the front vehicle so as to be able to swing up and down,
The rear unit is attached to the front unit so as to be rotatable in the left-right direction, and the transmission unit is provided with a brake device for restricting the lean movement of the front vehicle unit, while the engine speed is set near the crankshaft of the engine. A sensor for detecting the start and decrease of the drive reaction force of the propeller shaft due to acceleration / deceleration based on the rate of change of rotation of the crankshaft, thereby operating the brake device to increase the lean motion of the front vehicle section. It was regulated.

Further, in order to solve the above-mentioned problems,
As described in claim 3, in the lean type tricycle, an engine is mounted on the front vehicle portion, and a transmission unit for holding the rear wheel is provided on the rear vehicle portion, and the engine is provided via a propeller shaft. While transmitting the rotational driving force to the rear wheel, the transmission unit is divided into two parts, front and rear, to form a front unit and a rear unit, and the front unit can swing up and down to the front vehicle part. And the rear unit is attached to the front unit so as to be rotatable in the left-right direction, and the transmission unit is provided with a brake device for restricting the lean motion of the front vehicle portion, while the intake device of the engine is provided with a throttle device. A sensor for detecting the opening is provided, and a sensor for detecting the number of revolutions of the engine is provided in the vicinity of the crankshaft of the engine to change the opening of the throttle. The lean movement of the front vehicle is regulated by operating the brake device by detecting the start of increase or decrease of the driving reaction force of the propeller shaft due to acceleration / deceleration based on the amount and the rate of change of rotation of the crankshaft. .

According to another aspect of the present invention, an engine is mounted on the front vehicle and the rear wheel is mounted on the rear vehicle. While providing a transmission unit that holds
The transmission unit is divided into two parts, a front unit and a rear unit, and the front unit is attached to the front vehicle unit so as to be vertically swingable, and the rear unit is attached to the front unit. The transmission unit is mounted rotatably in the left-right direction, and a transmission is provided in the rear unit to transmit the rotation of the engine to the rear wheels, and the transmission is connected to the engine by a propeller shaft.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a left side view showing an example of the internal structure of a lean type tricycle to which the present invention is applied. As shown in FIG. 1, the lean-type three-wheeled motor vehicle 1 has a body frame 2, and a head pipe 3 is provided at a front end of the body frame 2. A front fork 5 and a handlebar 6 that rotatably support one front wheel 4 are mounted on the head pipe 3.
The handlebar 6 steers the front wheel 4 so as to be rotatable left and right.

An engine 7 is provided at the lower center of the body frame 2.
Is mounted. From the lower part of the head pipe 3, a pair of left and right lower down tubes 8 extend rearward and downward, pass through the lower part of the engine 7, and extend upward. Furthermore, a pair of left and right main tubes 9 extend rearward along the upper surface of the engine 7 from substantially the center of the rising portion at the front of the lower down tube 8, and, for example, at the rear of the engine 7, at the end of the lower down tube 8. Are connected to form a loop-shaped frame in side view.
The main tube 9 extends further rearward and upward,
The seat rail section 10 is formed.

An operation seat 11 for seating an occupant is installed above the seat rail section 10. On the other hand, head pipe 3
A pair of left and right upper down tubes 12 extend rearward and downward from above, and are connected in the middle of the main tube 9. A fuel tank 13 is disposed between the left and right upper down tubes 12. The body frame 2 is covered with a body cover 14 which is a synthetic resin molded product.

The engine 7 comprises, for example, a cylinder 15 disposed at a front portion thereof and a crankcase 16 disposed at a rear portion thereof. For example, an upper portion of the cylinder 15 is connected to, for example, a throttle body 17 constituting an intake device. .
An exhaust pipe 18 constituting an exhaust device is connected to a lower portion of the cylinder 15, and a muffler 19 is attached to a downstream end thereof. Further, a crankshaft 20 extending in the vehicle width direction is arranged on the front side inside the crankcase 16, and its rotational driving force is shifted by, for example, a V-belt type automatic transmission (not shown) provided inside the crankcase 16. After being turned by 90 degrees by a bevel gear (not shown), the power is transmitted to a drive shaft 21 (described later) disposed on the rear side inside the crankcase 16.

A radiator 22 constituting an engine cooling device is disposed in front of the engine 7, and is connected to the engine 7 by a cooling water hose (not shown). A transmission unit 23 as a power transmission unit is disposed behind the engine 7, and a front portion of the transmission unit 23 is pivotally attached to a bracket 24 provided at a rear portion of the lower down tube 8.

The transmission unit 23 also serves as a swing arm type rear wheel suspension device.
5 supports the vehicle body elastically and swingably. A pair of right and left rear wheels 26, which are drive wheels, are held at the rear end of the transmission unit 23.

FIG. 2 is an enlarged view around the transmission unit 23, and a part thereof is shown in a cross section. FIG. 3 is a view of the periphery of the transmission unit 23 as viewed obliquely from the front left, and FIG. 4 is a view of the periphery of the transmission unit 23 as viewed obliquely from the rear left.
As shown in FIGS. 2 to 4, the transmission unit 23 is divided into two parts, a front unit 27 and a rear unit 28.

The front unit 27 has a tunnel-like tube portion 29 extending in the front-rear direction. A pair of left and right pivot portions 30 are formed on the front side of the tube portion 29, and these pivot portions 30 are pivotally attached to the bracket 24 provided at the rear portion of the lower down tube 8 as described above. The front unit 27 can be vertically swung. Also, the pipe 29
A suspension arm 31 is formed on the upper surface of the shock absorber 25, and the lower end of the shock absorber 25 is attached to the suspension arm 31.

On the other hand, the rear unit 28 includes a tunnel-shaped lean case 32 and a differential case 33 fixed to the rear of the lean case 32. The lean case 32 has its front end inner diameter portion rotatably attached to the outer diameter portion at the rear end of the tube portion 29 via, for example, a ball bearing 34 so as to be rotatable in the left-right direction. Further, a final transmission 35 and a differential gear 36 are housed in the differential case 33.

The tube part 2 of the front unit 27 in the form of a tunnel
A propeller shaft 37 is disposed in the lean case 32 of the rear unit 9 and 9. Propeller shaft 3
A yoke 38 is spline-fitted to the front end of the engine 7 so as to be slidable in the axial direction, and the front end of the yoke 38 is connected to the rear end of the drive shaft 21 of the engine 7 by a cross joint 39.
Are connected via. Further, the rear end of the propeller shaft 37 passes through the final transmission 35 to be driven by the differential gear 3.
6, after turning the rotational driving force of the propeller shaft 37 transmitted from the engine 7 by 90 degrees.
6 is transmitted to the mounted rear axle shaft 40.

With the above-described configuration, this motorcycle 1
The front vehicle portion F excluding the rear vehicle portion R composed of the rear unit 28 and the rear wheel 26 can lean (tilt) to the left and right according to the driver's will, thereby improving the steering stability during cornering. increase. The three-wheeled motor vehicle 1 of the present invention has a brake device 41 for regulating the lean movement of the front vehicle portion F.
Is provided.

The brake device 41 is roughly divided into a control unit and an operation unit. The control unit mainly includes various sensors 42 to 44 described later and a computer 45 that sends a signal to the operating unit based on data obtained by these sensors 42 to 44. On the other hand, the operating section mainly includes a brake disk 46, a brake caliper 47, and a brake oil pump 48.

As shown in FIG. 1, a speed sensor 42 for detecting the rotational speed of the front wheel 4 is provided near the center of the front wheel 4, and the running speed of the vehicle is measured by the speed sensor 42. The throttle body 17 of the intake device is provided with a throttle opening sensor 43 for detecting the opening of a throttle valve (not shown), and measures the acceleration or deceleration of the vehicle based on the amount of change in the opening of the throttle valve. Is done.

Further, near the crankshaft 20, the rotational speed of the crankshaft 20, ie, the engine 7
An engine rotation sensor 44 for detecting the number of revolutions of the vehicle is provided, and the continuation of acceleration or deceleration of the vehicle is detected based on the rate of change in rotation of the crankshaft 20.

Further, an unillustrated inclination sensor for detecting the degree of inclination of the vehicle, that is, the degree of leaning of the front vehicle portion F, is provided inside the computer 45, for example. And
Information obtained by these sensors 42 to 44 is sent to a computer 45.

On the other hand, the brake disk 46 constituting the operating portion is the same as that generally used, and for example, a bolt 49 is attached to one of the transmission units 23, in this embodiment, the lean case 32 of the rear unit 28. (See FIG. 4). Also, the brake caliper 47
The transmission unit 23 is also fixed to a suspension arm 31 formed on the upper surface of the tube 29 of the front unit 27 in the present embodiment. Further, the brake caliper 47
A brake oil pump 48 is disposed in the nearby body frame 2, and the brake oil pump 48 and the brake caliper 47 are connected by an oil hose 51.

The computer 45 automatically sends an operation signal and a release signal to the brake oil pump 48 based on the data obtained by the various sensors 42 to 44, and the brake oil pump 48 controls the brake caliper 47 by these signals. Actuation / release, the rotation of the front unit 27 with respect to the rear unit 28 of the transmission unit 23, that is, the lean movement of the front vehicle unit F with respect to the rear vehicle unit R is restricted.

Incidentally, the motorcycle 1 according to the present invention is provided with a brake switch 51, for example, on the handlebar 6, which can manually operate / release the brake caliper 47 described above. And this brake switch 5
The activation signal and the release signal of the brake caliper 47 by 1 take precedence over the signal from the computer 45.

Next, the operation of the present embodiment will be described.

When the three-wheeled motor vehicle 1 is stopped and running at a low speed where it is difficult to maintain a lean balance, for example, when the vehicle speed is 5 km / h or less, the signal from the speed sensor 42 causes the computer 45 to set the running speed of the vehicle to a set value (for example, in this case). Is 5
km / h), the brake caliper 47 is operated to stop the lean motion of the front vehicle section F, thereby improving the steering stability during low-speed running. At this time, the inclination sensor detects the degree of inclination of the vehicle at the same time, and activates the brake caliper 47 only when the vehicle is at an angle close to horizontal so that the left-right balance of the vehicle can be sufficiently maintained.

Then, the speed at which the three-wheeled motor vehicle 1 accelerates to make it easy to maintain a lean balance (for example, in this case, 5 km /
h) When the above is reached, the computer 45 releases the operation of the brake caliper 47.

When sudden deceleration or acceleration is performed during running with the brake caliper 47 released, the driving force of the propeller shaft 37 for transmitting the rotational driving force of the engine 7 to the rear wheel 26 is reduced. The force may also increase or decrease rapidly, and the front vehicle portion F may cause a lean motion against the driver's intention, thereby deteriorating the ride comfort.

Therefore, the throttle body 17 of the intake device is
When the opening degree of the throttle valve is detected by the throttle opening sensor 43 provided in the controller 45, and the start of increasing or decreasing the driving reaction force of the propeller shaft 37 due to the driver's sudden deceleration or sudden acceleration operation is detected, the computer 45 Brake caliper 4
7 to stop unnecessary lean movement of the front vehicle portion F due to the driving reaction force of the propeller shaft 37, thereby improving the riding comfort.

Similarly, the continuation of acceleration or deceleration of the vehicle is detected by an engine rotation sensor 44 provided near the crankshaft 20 based on the rate of change in rotation of the crankshaft 20, and the driver performs deceleration or acceleration operation. Computer 45 detects that the brake caliper 4
7 to stop unnecessary lean movement of the front vehicle portion F due to the driving reaction force of the propeller shaft 37, thereby improving the riding comfort.

The operation of the brake caliper 47 depends on the opening change amount of the throttle valve and the crankshaft 2.
It can be performed by using one or both of the rotation change rates of 0.

On the other hand, the heavy engine 7 is mounted on the front vehicle portion F which is sprung, and only the transmission unit 23 and the rear wheel 26 are arranged on the rear vehicle portion R which is unsprung, so that the engine layout is free. More ideal front wheels 4 and rear wheels 2
6, the ride comfort and maneuverability are improved, and the unsprung weight is reduced, so that the rear wheel 26 can follow the road surface, and the ride comfort is improved.

In addition, since the engine 7 is mounted on the front vehicle section F, the piping of the cooling water hose is fixedly provided, and installation restrictions are reduced.

Further, since the final transmission 35 is provided separately from the engine 7 and housed in the transmission unit 23 of the rear vehicle section R, the torque of the engine 7 transmitted to the propeller shaft 37 before final deceleration is reduced. Since the torque is small, the driving reaction force of the propeller shaft 37, which rapidly increases or decreases due to the driver's sudden deceleration or sudden acceleration operation, is also reduced, and the lean motion of the front vehicle portion F is reduced, so that the riding comfort is improved.

[0041]

As described above, according to the lean-type three-wheeled motor vehicle of the present invention, one front wheel and two rear wheels are provided in the front vehicle portion and the rear vehicle portion, respectively. In a lean type three-wheeled motor vehicle which is swingably connected to each other up, down, left and right, an engine is mounted on the front vehicle portion, a transmission unit for holding the rear wheel is provided on the rear vehicle portion, and the engine is mounted via a propeller shaft. While transmitting the rotational driving force to the rear wheel, the transmission unit is divided into two parts, front and rear, to form a front unit and a rear unit, and the front unit can swing up and down to the front vehicle part. The rear unit is attached to the front unit so as to be rotatable in the left-right direction, and the transmission unit is provided with a brake device for restricting the lean movement of the front vehicle unit, while the intake unit of the engine is provided with a throttle. A sensor for detecting the opening of the throttle, and detecting the start of increase or decrease in the driving reaction force of the propeller shaft due to acceleration / deceleration based on the amount of change in the opening of the throttle to operate the brake device to operate the front vehicle section. , The unnecessary lean movement of the front vehicle due to the driving reaction force of the propeller shaft is prevented, and the riding comfort is improved.

In the above-mentioned lean type three-wheeled motor vehicle, an engine is mounted on the front vehicle portion, a transmission unit for holding the rear wheel is provided on the rear vehicle portion, and a rotational driving force of the engine is provided via a propeller shaft. To the rear wheel, the transmission unit is divided into two front and rear parts to form a front unit and a rear unit, and the front unit is attached to the front vehicle part so as to be vertically swingable, The rear unit is attached to the front unit so as to be rotatable in the left-right direction, and the transmission unit is provided with a brake device for restricting the lean movement of the front vehicle unit, while the engine speed is set near the crankshaft of the engine. A sensor for detecting the start of increase or decrease of the driving reaction force of the propeller shaft due to acceleration / deceleration based on the rotation change rate of the crankshaft. Since that regulates the lean movement of said preceding vehicle unit by operating the braking device by lean movement unnecessary preceding vehicle unit by the driving reaction force of the propeller shaft is prevented, ride comfort is improved.

Further, in the above-mentioned lean type three-wheeled motor vehicle, an engine is mounted on the front vehicle portion, a transmission unit for holding the rear wheel is provided on the rear vehicle portion, and a rotational driving force of the engine is provided via a propeller shaft. To the rear wheel, the transmission unit is divided into two front and rear parts to form a front unit and a rear unit, and the front unit is attached to the front vehicle part so as to be vertically swingable, The rear unit is attached to the front unit so as to be rotatable in the left-right direction, and the transmission unit is provided with a brake device for restricting the lean movement of the front vehicle unit, while the intake device of the engine detects a throttle opening. And a sensor for detecting the number of revolutions of the engine is provided in the vicinity of the crankshaft of the engine, and the amount of change in the opening degree of the throttle and the like are provided. And operating the brake device to restrict the lean motion of the front vehicle section by detecting the start / decrease of the drive reaction force of the propeller shaft due to acceleration / deceleration based on the rotation change rate of the crankshaft. Unnecessary lean movement of the front vehicle due to driving reaction force is prevented, and riding comfort is improved.

Further, in the above-mentioned lean-type three-wheeled motor vehicle, an engine is mounted on the front vehicle portion, and a transmission unit for holding the rear wheel is provided on the rear vehicle portion. A front unit and a rear unit, and the front unit is attached to the front vehicle unit so as to be swingable in the vertical direction, and the rear unit is attached to the front unit so as to be rotatable in the left-right direction. A transmission is provided in the rear unit to transmit the rotation of the engine to the rear wheels by transmission, and the transmission is connected to the engine by a propeller shaft, so that the driving reaction force of the propeller shaft is reduced and the front vehicle is reduced. The lean movement of the part is also reduced, and the riding comfort is improved.

[Brief description of the drawings]

FIG. 1 is a left side view showing an embodiment of the internal structure of a lean-type tricycle according to the present invention.

FIG. 2 is an enlarged view around a transmission unit, a part of which is shown in a cross section.

FIG. 3 is a diagram of the periphery of a transmission unit as viewed obliquely from the left front;

FIG. 4 is a view of the periphery of a transmission unit as viewed from obliquely rear left.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lean type tricycle 4 Front wheel 7 Engine 17 Throttle body (Intake device) 20 Crankshaft 23 Transmission unit 26 Rear wheel 27 Front unit 28 Rear unit 32 Lean case 33 Differential case 35 (Final) transmission 37 Propeller shaft 41 Brake device 43 Throttle opening sensor 44 Engine rotation sensor 45 Computer 46 Brake disc 47 Brake caliper 48 Brake oil pump F Front car R Rear car

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B60K 41/20 B60K 41/20 B62K 5/04 B62K 5/04 C

Claims (4)

[Claims] 1. A lean-type three-wheeled motor vehicle in which one front wheel and two rear wheels are provided in a front vehicle portion and a rear vehicle portion, respectively, and both vehicle portions are connected to each other so as to be able to swing up, down, left and right. An engine is mounted on the front vehicle portion, a transmission unit for holding the rear wheel is provided on the rear vehicle portion, and the rotational driving force of the engine is transmitted to the rear wheel via a propeller shaft,
The transmission unit is divided into two parts, a front unit and a rear unit, and the front unit is attached to the front vehicle unit so as to be vertically swingable, and the rear unit is attached to the front unit. The transmission unit is provided so as to be rotatable in the left-right direction, and the transmission unit is provided with a brake device for restricting the lean movement of the front vehicle portion, while the intake device of the engine is provided with a sensor for detecting the opening degree of the throttle, and the opening of the throttle is provided. A lean-type three-wheeled vehicle, wherein the leaning movement of the front vehicle portion is regulated by operating the brake device by detecting the start of increase / decrease of the drive reaction force of the propeller shaft due to acceleration / deceleration based on the degree change amount. . 2. A lean-type three-wheeled motor vehicle in which one front wheel and two rear wheels are provided in a front vehicle portion and a rear vehicle portion, respectively, and both vehicle portions are connected to each other so as to be able to swing up, down, left and right. An engine is mounted on the front vehicle portion, a transmission unit for holding the rear wheel is provided on the rear vehicle portion, and the rotational driving force of the engine is transmitted to the rear wheel via a propeller shaft,
The transmission unit is divided into two parts, a front unit and a rear unit, and the front unit is attached to the front vehicle unit so as to be vertically swingable, and the rear unit is attached to the front unit. The transmission unit is provided with a brake device for restricting lean movement of the front vehicle portion, and a sensor for detecting the number of revolutions of the engine is provided near a crankshaft of the engine. A lean type wherein the lean movement of the front vehicle portion is regulated by operating the brake device by detecting the start of increase / decrease of the drive reaction force of the propeller shaft due to acceleration / deceleration based on the rotation change rate of the shaft. Automatic tricycle. 3. A lean-type three-wheeled motor vehicle in which one front wheel and two rear wheels are provided in a front vehicle portion and a rear vehicle portion, respectively, and both vehicle portions are connected to each other so as to be able to swing up, down, left and right. An engine is mounted on the front vehicle portion, a transmission unit for holding the rear wheel is provided on the rear vehicle portion, and the rotational driving force of the engine is transmitted to the rear wheel via a propeller shaft,
The transmission unit is divided into two parts, a front unit and a rear unit, and the front unit is attached to the front vehicle unit so as to be vertically swingable, and the rear unit is attached to the front unit. The transmission unit is provided so as to be rotatable in the left-right direction, and the transmission unit is provided with a brake device for restricting the lean movement of the front vehicle portion, while the intake device of the engine is provided with a sensor for detecting the opening degree of a throttle, and the engine is provided with a sensor. A sensor for detecting the number of revolutions of the engine is provided near the crankshaft, and based on the amount of change in the opening degree of the throttle and the rate of change in the rotation of the crankshaft, detects the start / decrease of the drive reaction force of the propeller shaft due to acceleration / deceleration. A lean-type automatic three-wheeled vehicle characterized in that the leaning movement of the front vehicle part is regulated by operating the brake device. . 4. A lean-type three-wheeled motor vehicle wherein one front wheel and two rear wheels are provided on a front vehicle portion and a rear vehicle portion, respectively, and both vehicle portions are swingably connected to each other up, down, left and right. A transmission unit for mounting an engine in a front vehicle portion and holding the rear wheel in the rear vehicle portion is provided, and the transmission unit is divided into two front and rear parts to constitute a front unit and a rear unit. The unit is attached to the front vehicle unit so as to be swingable in the vertical direction, and the rear unit is attached to the front unit so as to be freely rotatable in the left and right direction. A lean-type three-wheeled motor vehicle comprising: a transmission that transmits to a rear wheel; and the transmission and the engine are connected by a propeller shaft.