KR20020007666A - Final reduction system of vehicle - Google Patents

Abstract

PURPOSE: A final reduction apparatus of a vehicle is provided to prevent the output of an engine from lowering during traveling on an inclined road, and to improve traveling efficiency by varying the reduction ratio of driving force transmitted from a propeller shaft to a differential gear with operating a switch. CONSTITUTION: A final reduction gear system is composed of a first driving gear(4) installed in the end of a propeller shaft(2); a second driving gear(6) fixed in the propeller shaft; a first driven gear(14) engaged with the first driving gear, and fitted to a rotating shaft(12) connected to a pinion gear(10); a second driven gear(16) engaged with the second driving gear, and fitted to the rotating shaft to idle; a sleeve(18) placed between the first driven gear and the second driven gear to connect the rotating shaft to the first driven gear or the second driven gear selectively; and a driving unit moving the sleeve linearly. The second driving gear is engaged with the second driven gear with moving the sleeve to the right by generating negative pressure in the cylinder in turning on the switch during traveling on the inclined road. Lowering of the engine output is prevented in traveling on the inclined road, and traveling performance is improved with varying the reduction ratio of driving force according to operation of the switch.

Description

Final reduction system of vehicle {

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle longitudinal reduction device, and more particularly, to a vehicle longitudinal reduction device capable of improving gradient driving and humway driving performance by varying a reduction ratio transmitted from a propeller shaft to a differential gear.

In general, the longitudinal reduction device is a device that decelerates the power transmitted from the propeller shaft at right angles or close to right angles to the rear axle, and at the same time, to increase the rotational force according to the use of the vehicle.

1 is a cross-sectional view of a longitudinal reduction device according to the prior art.

Conventional longitudinal reduction device is a pinion gear 104 is connected to the end of the propeller shaft 102 and rotated together, and the ring gear 106, which is geared with the pinion gear 104, and transfers the rotational force at a right angle Is done. Here, the longitudinal reduction ratio between the pinion gear 104 and the ring gear 106 is usually limited to 4: 1.

However, since the longitudinal reduction ratio according to the prior art as described above is fixed in the longitudinal reduction ratio, there is a problem in that the running performance is deteriorated due to the lack of engine power when driving the gradient or when driving on a bad road.

In other words, in the design of the vehicle, the gear ratio is limited, and the gear shift stage of the transmission is limited, so that the vehicle speed is lowered due to the engine output deterioration on a steep slope or a rough road, and the driving performance is lowered.

The present invention was created in order to solve the above problems, the object of the present invention is that the longitudinal deceleration ratio can be changed according to the driver's operation can run smoothly even during steep slope driving or steep road driving performance It is to provide a longitudinal reduction device for a vehicle that can improve the.

1 is a cross-sectional view of a longitudinal reduction device according to the prior art,

2 is a cross-sectional view of the longitudinal reduction device according to the present invention,

3 is a state diagram of use of the longitudinal reduction device according to the present invention.

<Explanation of symbols for the main parts of the drawings>

2: Propeller Shaft 4: First Drive Gear

6: second drive gear 10: pinion gear

12: shaft 14: first driven gear

16: 2nd driven gear 18: sleeve

30: operating fork 32: push rod

34; cylinder

A longitudinal reduction device for a vehicle according to the present invention for realizing the above object includes a first drive gear fixed to a propeller shaft, a second drive gear having a smaller number of teeth than the first drive gear, and fixed to the propeller shaft; A first driven gear that is engaged with the first drive gear and is idlely fitted on a rotating shaft connected to the pinion gear, and a number of teeth that are engaged with the second drive gear and more teeth than the first driven gear. A second driven gear fitted on the rotary shaft so as to be idling, a sleeve positioned between the first driven gear and the second driven gear to selectively connect the first and second driven gears with the rotary shaft, and to linearly move the sleeve. Characterized in that the drive means to make.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a cross-sectional view showing a longitudinal reduction device according to the present invention.

The longitudinal reduction gear comprises a ring gear 15 of the differential device, a pinion gear geared with the ring gear 15, a first drive gear 4 mounted at the end of the propeller shaft 2, and The second drive gear 6 having a smaller number of teeth than the first drive gear 4 and fixed to the same axis as the first drive gear 4, and the pinion gear 10 being meshed with the first drive gear. The first driven gear 14 and the second driven gear 6 and the second driven gear 6 is geared so as to be idling on the rotary shaft 12 connected to the form and has a larger number of teeth than the first driven gear 14. The second and second driven gears 16 are rotatably fitted on the rotary shaft 12, and the first and second driven gears 14 are positioned between the first and second driven gears 14 and 16. And a sleeve 18 for selectively connecting the shaft 16 to the rotary shaft 12 and driving means for linearly moving the sleeve 18.

Since the first driving gear 4 and the first driven gear 14 have the same number of teeth, the first reduction gear ratio is 4: 1, and the final reduction ratio is 4: 1, and the second driving gear ( Compared to 6), the number of teeth of the second driven gear 16 is formed by a certain number, and the longitudinal reduction ratio finally transmitted to the differential device is 6: 1.

The sleeve 18 is splined on the rotation shaft 12 and linearly moved in the axial direction, and gears are formed on both sides of the clutch gear 24 and the second driven gear formed on one side of the first driven gear 14. Each of the clutch gears 26 formed on one side of 16 is selectively engaged with each other.

The driving means includes an operating fork 30 slidably fitted into the guide groove 28 formed on the circumferential surface of the sleeve 18, a push rod 32 connected to the operating fork 30, and the push rod. A cylinder 34 for linearly moving the 32 and a switch (not shown) for operating the cylinder 34.

Here, the cylinder 34 is slidably fitted with a piston 36 to which the push rod 32 is connected, and connected to a pipe 40 to which negative pressure is supplied to one side thereof, and the piston 36 and the cylinder inner wall surface. Between the elastic member 38 which imparts a restoring force to the piston 36 is interposed.

In this way the operation of the longitudinal reduction device according to the present invention will be described below.

3 is an operating state diagram of the longitudinal reduction device according to the present invention.

First, when the longitudinal reduction ratio is 4: 1 during normal road driving or flat road driving, the push rod 32 is moved when the piston 36 is moved to the left side by the elastic force of the elastic member 38. Push the sleeve 18 to the left. At this time, the first driving gear 4 and the first driven gear 14 are engaged by the sleeve 18, and the driving force of the propeller shaft is transmitted to the rotating shaft 12 in a state in which the propeller shaft is decelerated at 4: 1.

In this state, the driver turns on the power when the longitudinal deceleration ratio is 6: 1 when driving on a steep slope or when driving on a steep road. Then, a negative pressure is generated inside the cylinder 34 through the pipe 40 to overcome the elastic force of the elastic member 38 and when the piston 36 is moved to the right side as seen in the drawing, the push rod 32 is pulled and accordingly the sleeve 18 is shifted to the right as seen in the figure, and the second drive gear 6 and the second driven gear 16 is geared. Then, the driving force of the propeller shaft 2 is transmitted to the rotating shaft 12 in a state in which it is decelerated at 6: 1.

Accordingly, the longitudinal reduction device for a vehicle according to the present invention constructed and operated as described above allows the longitudinal reduction ratio of the driving force transmitted from the propeller shaft to the differential device to be changed by the driver's switch operation so that the slope is steep or the steep road There is an advantage that can improve the running performance by preventing the output of the engine during driving.

Claims (3)

A first driving gear fixed to the propeller shaft; A second driving gear having a smaller number of teeth than the first driving gear and fixed to the propeller shaft; A first driven gear which is engaged with the first driving gear and is rotatably fitted on a rotating shaft connected to the pinion gear; A second driven gear that is engaged with the second driving gear and has a larger number of teeth than the first driven gear, and is fitted on the rotary shaft to be idle; And a sleeve positioned between the first driven gear and the second driven gear to selectively connect the first and second driven gears with the rotary shaft, and a driving means for linearly moving the sleeve. The method of claim 1, The sleeve is splined on the rotary shaft and linearly moved in the axial direction. Gears are formed on both sides of the sleeve to selectively engage the clutch gear formed on one side of the first driven gear and the clutch gear formed on one side of the second driven gear, respectively. Vehicle deceleration device, characterized in that made to be. The method of claim 1, The driving means includes an operating fork slidably fitted into the guide groove of the sleeve, a push rod connected to the operating fork, a cylinder for linearly moving the push rod when a negative pressure is applied, and a switch for operating the cylinder. Vehicle deceleration device, characterized in that made.