JPH04228950A - Power train construction for vehicle - Google Patents

Abstract

PURPOSE:To effectively restrain vibration including torsion and bending of a crankshaft by providing a spring member in an output transmission route to transfer engine output to a transmission, and further providing a damper member in parallel with the spring member. CONSTITUTION:In an engine output transmission route, a balance shaft 12 is an elastic rod member and, therefore, displays the function of a spring member as a torsion bar against the vibration of a crankshaft 8. On the other hand, a shaft 15 is connected to the crankshaft 8 via a damper member 24 positioned in parallel to the balance shaft 12, and the damper member 24 follows the rotation of the crankshaft 8 due to the frictional contact of members energized with a spring, thereby causing the rotation of the shaft 15. Also, when a difference occurs between the rotation of the shaft 15 and another rotation thereof due to engine output transmission through the balance shaft 12, damping force is generated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power train structure for a vehicle, and more particularly to measures for suppressing engine vibration.

0002

2. Description of the Related Art Generally, in the powertrain structure of a vehicle, the driving force output from the crankshaft of the engine is transmitted to the crankshaft or the transmission, as disclosed in, for example, Japanese Unexamined Patent Publication No. 63-103735. The power is transmitted to the transmission via a clutch located coaxially with the shaft.

0003

[Problems to be Solved by the Invention] By the way, the above-mentioned crankshaft is susceptible to vibrations such as torsion and bending due to the attachment of pulleys, belts, etc. for driving the flywheel and auxiliary equipment. There is a problem in that it is transmitted to the inside and worsens the ride comfort. For this reason, traditionally a balance shaft was installed in parallel with the crankshaft,
Although attempts have been made to reduce various vibrations of the crankshaft by rotating the balance shaft with power from the crankshaft, the reality is that sufficient effects have not been achieved. The present invention has been made in view of the above, and its purpose is to provide a mechanism for damping crankshaft vibration in the output system of the engine, thereby effectively suppressing the vibration of the vehicle. The purpose is to provide a train structure.

0004

[Means for Solving the Problems] In order to achieve the above object, the solution means of the present invention is to provide a power train structure for a vehicle in which a spring member is interposed in the output transmission path that transmits the output of the engine to the transmission side. At the same time, a damper member is provided in parallel with the spring member.

[0005]

[Operation] With the above structure, in the present invention, vibrations of the engine crankshaft are damped by a vibration damping mechanism consisting of a spring member and a damper member, which are provided in parallel with each other in the output transmission path of the engine.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

1 to 4 show the power tray structure of a four-wheel drive vehicle according to a first embodiment of the present invention, in which 1 is a vehicle body, 2 is an engine room provided at the front of the vehicle body 1; The engine room 2 is separated from the vehicle interior 4 by a dash panel 3. In the engine room 2, a radiator 5 is disposed on the front side thereof, and an engine 6 and a transmission 7 are disposed behind the radiator 5. The engine 6 is a four-cylinder reciprocating engine that is placed horizontally with the crankshaft 8 facing the vehicle width direction, and the transmission 7 is placed horizontally behind the engine 6 and in parallel with the crankshaft 11. It is located in

Further, reference numeral 11 is disposed coaxially with the crankshaft 8 of the engine 6, and is connected from the engine 6 to the transmission 7.
Clutches 12 and 13 are a pair of balance shafts arranged parallel to the crankshaft 8 of the engine 2, and both of the balance shafts 12 and 13 are Power is received from the axially intermediate portion of the crankshaft 8 (specifically, the portion between the first cylinder and the second cylinder from the left side) through a set of gears 14, and is synchronized with the rotation of the crankshaft 8. The crankshaft 8 is rotated to suppress vibrations of the crankshaft 8. One end of the one balance shaft 12 extends laterally than the crankshaft 8, and a gear 16 is attached to the end.
The gear 16 meshes with a gear 17 provided at one end (the end close to the engine 6) of the shaft 15 to which the clutch 11 is fitted. Therefore, the balance shaft 12 has a function as an intermediate shaft that transmits the output of the engine 6 (rotational force of the crankshaft 8) to the clutch 11, and also serves as an output transmission path that transmits the engine output to the transmission 7 side. It also functions as a torsion bar, which is a spring member interposed in the .

One end of the shaft 15 is inserted into a hole 18 formed on the center line of the end of the crankshaft 8 and supported via a bearing 19 so as to be relatively rotatable. Further, a slip disk 20 is integrally formed on the outer periphery of the end of the crankshaft 8, and a clamping portion 21 having a link-shaped groove surrounding the slip disk 20 is attached to the gear 17 on the shaft 15 side.
is provided. The holding part 21 and the slip disk 2
As shown in detail in FIG. A spring 23 is provided to press and bias the plate 22. These constitute a damper member 24 that generates a damping force against vibrations of the crankshaft 8, and this damper part 24 is connected to the spring member or torsion in the output transmission path that transmits the engine output to the transmission 7 side. It is located in parallel with the balance shaft 12 as a bar.

The clutch 11 includes a support disk 31 that is rotatably fitted to the other end of the shaft 15 (the end opposite to the engine 6), and
, and a pressure plate 33 that presses the clutch disk 32 against the support disk 31. The clutch disc 32 is rotatably attached to one end (the end opposite to the engine 6) of a hollow shaft 34 that is fitted to the outer periphery of the shaft 15 so as to be relatively rotatable, and the other end of the shaft 34 is A gear 35 is provided, and the gear 35 meshes with a gear 36 on the transmission 7 side, and when the clutch 11 is connected (that is, when the clutch disc 32 is pressed against the support disc 31), this pair Engine driving force is transmitted to the transmission 7 through gears 35 and 36.

The transmission 7 has a primary shaft 41 and a counter shaft 42 that are parallel to each other, and a transmission gear train 43 is disposed between the two shafts 41 and 42. The primary shaft 41 is formed of a hollow shaft, and by inserting the axle shaft 55R into the primary shaft 41, the shafts 41 and 55R are arranged concentrically and relatively rotatable. The engine driving force input to the transmission 7 is transmitted to the countershaft 42 via a reduction gear 44 which is rotatably provided with the gear 36, and from the countershaft 42 to the transmission gear train 43.
It is transmitted to the primary shaft 41 via any one of the gears, and is appropriately decelerated during this time.

Further, an output gear 51 is rotatably provided at one end of the primary shaft 41 of the transmission 7. The driving force output from the output gear 51 is divided between the front wheels and the rear wheels by a bevel gear type center differential 52. The driving force for the front wheels is divided into left and right sides by a bevel gear type front differential 54 as an inter-wheel differential via a set of transmission gears 53, and is then divided into left and right sides by axle shafts 55L, 55R and a drive shaft 56L, respectively, which serve as front wheel axles. , 56R to the left and right front wheels 9. Further, the driving force on the rear wheel side is transmitted to the rear wheel side at the rear of the vehicle body via a bevel gear 57 and a propeller shaft 58.

[0013] Here, to explain in detail the arrangement of the power train components such as the engine 6 and the transmission 7, as shown in FIG. It is placed horizontally with the camera tilted backwards. The axis P2 of one balance shaft 12 is on the front side with the axis P1 of the crankshaft 8 of this engine 6 in between, and the other balance shaft 1 is on the rear side.
3 axes P3 are arranged respectively. Further, the axis P4 of the primary shaft 41 of the transmission 7 and the front differential 54 is the balance shaft 1
The axial center P5 of the counter shaft 42 of the transmission 7 is set at a position rearward of the axial center P3 of the primary shaft 41 and below the axial center P1 of the crankshaft 8. is also set diagonally upward.

In FIG. 4, 61 and 62 are the intake pipe and exhaust pipe of the engine 6, respectively, and 63 is a steering rack located behind the transmission 7 and close to the bottom of the dash panel 3. The exhaust pipe 62 is disposed to pass below the steering rack 63.

Next, to explain the operation and effect of the first embodiment, the output of the engine 6, that is, the rotational force of the crankshaft 8 is transmitted to the pair of balance shafts 1 through the gear 14.
2 and 13, respectively, and both balance shafts 12,
13 rotates in synchronization with the rotation of the crankshaft 8, so that vibrations of the crankshaft 8 can be suppressed.

Further, the rotation of one of the balance shafts 12 is transmitted to the shaft 15 via a pair of gears 16 and 17, and inputted from the shaft 15 to the clutch 11. In this engine output transmission path, the balance shaft 12 is an elastic rod-shaped member, and thus functions as a torsion bar and a spring member against vibrations of the crankshaft 8. On the other hand, the shaft 15 is
It is connected to the crankshaft 8 via a damper member 24 located in parallel with the balance shaft 12. The frictional contact between the slip disc 20 and the friction plate 22 causes the shaft 15 to rotate following the rotation of the crankshaft 8, and the rotation and the balance shaft 1
A damping force is generated when a difference between the rotation of the shaft 15 and the rotation of the shaft 15 due to the transmission of the engine output through the shaft 15 occurs. As a result,
The vibrations of the crankshaft 8 are significantly suppressed together with the synchronous rotation of the balance shafts 12 and 13 described above, and the riding comfort can be improved.

FIGS. 6 and 7 show a vehicle power train structure according to a second embodiment of the present invention. In this embodiment, a pair of balance shafts 71 and 72 arranged parallel to the crankshaft 8 of the engine 6 connect a pair of gears 7 from an axial end (right end in the figure) of the crankshaft 8.
3 (73a, 73b, 73c). One of the balance shafts 71 is connected to the gear 73b via a solid intermediate shaft 74, and the other balance shaft 72 is connected to the hollow intermediate shaft 7.
5 and is connected to a gear 73c.

A torsion bar 76 as a spring member is inserted into the intermediate shaft 75 so as to be relatively rotatable. One end of the torsion bar 76 is connected to the balance shaft 72, and the other end is connected to the engine. A clutch 77 is provided as a power connection/disconnection device that connects/disconnects power transmission from the engine 6 to the transmission (not shown), and the torsion bar 76
It has a function as an intermediate shaft that transmits the rotational force (rotational force) to the clutch 77. The clutch 77 includes a support disk 7 that is rotatably fitted to the torsion bar 76.
8, a clutch disk 79 provided opposite to the support disk 78, and a pressure plate 80 for pressing the clutch disk 79 against the support disk 78. A gear 81 for transmitting engine output to the transmission is provided in the hub portion 79a of the clutch disc 79 in close proximity to the gear 73c. On the other hand, a damper member 82 that generates a damping force is provided. As shown in an enlarged view in FIG. 8, the damper member 82 includes a slider 84 that is removably provided in a recess 83 formed on the side surface of one of the gears 81, and a slider 84 between the slider 84 and the recess 83. A spring 85 is compressed between the two gears and urges the slider 84 to protrude from the inside of the recess 83 and press against the side surface of the other gear 73c.

[0019] Also in the second embodiment, the first
As in the case of the embodiment, a torsion bar 76 as a spring member is interposed in the output transmission path of the engine, and a damper member 82 is provided in parallel with the torsion bar 76, thereby suppressing vibrations of the crankshaft 8. On the other hand, vibration can be suppressed by generating a damping force.

[0020]

As described above, according to the vehicle powertrain structure of the present invention, by providing the spring member and the damper member in parallel in the output transmission path of the engine, twisting and bending of the engine crankshaft can be prevented. The vibration of the vehicle can be effectively suppressed, and ride comfort can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a power train structure of a vehicle according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the main part of FIG. 1;

FIG. 3 is a skeleton diagram of the power train structure.

FIG. 4 is a side view showing the arrangement of the power train at the front of the vehicle body.

FIG. 5 is an enlarged sectional view of the damper member.

FIG. 6 is a diagram corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 7 is an enlarged view of the main part of FIG. 6;

FIG. 8 is a diagram corresponding to FIG. 5, also showing the second embodiment.

[Explanation of symbols]

6 Engine 7 Transmission 12 Balance shaft (spring member) 24 Damper member 76 Torsion bar (spring member) 82 Damper member

Claims (1)

[Claims] Claim 1: A spring member is interposed in the output transmission path that transmits the output of the engine to the transmission side, and
A power train structure for a vehicle, characterized in that a damper member is provided in parallel with the spring member.