JPS6124754Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a power transmission device for an automobile that combines a torque converter and a planetary gear device.

When this type of power transmission device is designed as a power unit with the engine mounted horizontally, a reduction gear device is placed between the torque converter and the planetary gear device, and the torque is transmitted from the torque converter to the planetary gear device via the transmission shaft. The generated power is reversed within the planetary gear device, outputted to the torque converter side, and transmitted to the differential gear device via the reduction gear device.

Further, in consideration of ease of assembly, the case of the power unit is divided into two parts: a housing that accommodates the torque converter, and a transmission case that accommodates the planetary gear device.

However, in such a power unit structure, the bearing structure of the output shaft of the planetary gear device and the reduction gear spline-fitted to this output shaft is complicated, and the output shaft is bearing on the transmission case side, Since the reduction gear is bearing on the housing side, misalignment of the shaft center between the two bearings is likely to occur, causing various problems such as difficulty in assembly, generation of abnormal noise, and shortened bearing life.

This idea was made to solve the above-mentioned problems. A large diameter flange is integrally molded on one end of the stator shaft of the torque converter, and there is a gap between the flange and the partition wall of the transmission case. A reduction gear of the reduction gear device is arranged, and the reduction gear is spline-fitted to the output shaft of the planetary gear device protruding from the partition wall of the transmission case, and the outer periphery of the side of the reduction gear is connected to the flange of the stator shaft via a bearing. The bearing is supported by a bearing housing protruding from the part, while a boss hole is provided in the housing that accommodates the torque converter.
By closely fitting the flange of the stator shaft into the boss hole and directly connecting the outer periphery of the flange to the mating surface of the transmission case with bolts, the bearing of the output shaft provided on the transmission case side is formed. The axes of the bearing of the reduction gear located on the housing side are aligned with high accuracy, and the bearing structure is simplified and the life of the bearing is improved.

Hereinafter, the embodiments will be described in detail according to the embodiments shown in the drawings. In the figure, 1 is a housing, 2 is a transmission case, and inside the housing 1,
A torque converter 3 consisting of a pump 3a, a turbine 3b, and a stator 3c is installed inside.

The pump 3a of the torque converter 3 is connected to a crankshaft (not shown) of the engine via a drive plate 3d, and the stator 3c is spline-fitted to a cylindrical stator shaft 5 via a one-way clutch 4. The turbine 3b passes through the stator shaft 5 and is spline-fitted to a transmission shaft 6 mounted horizontally within the transmission case 1.

Further, a large diameter flange portion 5a is integrally formed at one end of the stator shaft 5, and an oil pump 7 driven by a pump 3a is provided on the torque converter 3 side of the flange portion 5a. On the opposite side is a reduction gear device A, which will be described later.
has been established. Further, radially outward of the transmission shaft 6, a differential gear device B having a large reduction gear 8 and other gear groups is installed in the chamber defined by the transmission case 2 and the housing 1;
The rotary power of the engine is reduced by the reduction gear A and transmitted to the differential gear B.

Further, the transmission case 2 is integrally formed with a partition wall 2a that partitions the transmission case 2 from the torque converter 3, and a planetary gear unit C is installed in a chamber defined by the partition wall 2a.

This planetary gear device C has an input sun gear 9 fitted and fixed onto the transmission shaft 6, a low sun gear 10 on both left and right sides adjacent to the gear 9, and a cylindrical output shaft 11 on the right side of the shaft center. A long pinion 13 that is loosely fitted with a planetary carrier 12 that is integrally formed to extend and meshes with the input sun gear 9, and a long pinion 13 that meshes with the input sun gear 9;
A short pinion 14 that meshes with the long pinion 13 and meshes with the long pinion 13 is supported by shaft rods 15 and 16, and a reverse ring gear 17 that meshes with the short pinion 14 is provided around the outer periphery of these planetary gear groups. At a location facing the planetary carrier 12, a parking lock gear 18 is supported by the protruding ends of the shaft rods 15, 16.

A multi-stage friction plate type reverse clutch 19 is interposed between the outer periphery of the reverse ring gear 17 and the inner wall surface of the transmission case 2.

Further, a piston 20 is provided on the right side of the planetary carrier 12, and the piston 20 is moved forward and backward by pressure oil from the oil pump 7 to operate the reverse ring gear 17 on and off via the reverse clutch 19. ing.

Furthermore, a clutch drum 21 is loosely fitted around the transmission shaft 6 on the left side of the planetary gear group, and the transmission shaft 6 is connected from the oil pump 7 into the drum 21.
A piston 23 that can be moved forward and backward by pressure oil supplied through an oil passage 22 formed through the inside is inserted, and the piston 23 is fitted on the inner wall surface of the clutch drum 21 and the transmission shaft 4 on the right side of the piston 23. A multi-stage friction plate type clutch 25 is interposed between the clutch hub 24 and the clutch drum 21.
A clutch flange 26 that engages with this drum 21 and meshes with the low sun gear 10 is provided at the right end of the clutch flange 26 .
A brake band 27 is provided on the outer periphery of the clutch drum 21 to fix or free the drum 21 using pressure oil.

An idle shaft 28 is installed between the walls of the transmission case 2 and the housing 1 between the output shaft 11 integrally formed with the planetary carrier 12 and the differential gear device B. First and second reduction gears 29, 3 are attached to the shaft 28.
0, and the first reduction gear 29 is connected to the output shaft 11.
Fit the reduction gear 31 spline-fitted to the
Further, the second reduction gear 30 is made to mesh with the large reduction gear 8 of the differential gear device B, and the reduction gear device A described above is connected to the reduction gear 31 and the first reduction gear 29.
a first reduction mechanism, and the second reduction gear 30.
and a second reduction mechanism including a large reduction gear 17.

In the power transmission device as described above, this invention integrally forms a large-diameter flange portion 5a at one end of the stator shaft 5 of the torque converter 3, and connects the flange portion 5a with the transmission case 2.
The reduction gear 3 of the reduction gear device A is connected to the partition wall 2a of the
1 and the output shaft 11 of the planetary gear device C.
is supported by a bearing on a bearing boss 2c provided on the partition wall 2a,
The reduction gear 31 is spline-fitted to the output shaft 11, and a bearing housing 5b is formed to protrude from the flange portion 5a of the stator shaft, and the outer periphery of the reduction gear 31 is supported on the bearing housing 5b via a bearing 34. are doing. Further, a boss hole 1a is provided in the housing 1 that accommodates the torque converter 3, and the boss hole 1a is closely fitted to the flange portion 5a of the stator shaft.
a, and attach the outer periphery of the flange portion 5a to the mating surface 2b of the transmission case 2 with the bolts 32.
It is directly tightened and fixed.

In addition, mating surface 2 of transmission case 2
b is provided with a recess 35 for accommodating the reduction gear 31 etc. of the reduction gear device A as shown in FIG. 36 is provided so that the oil stirring resistance of the reduction gear 31 is reduced.

Bolt holes 37 are provided at equal intervals on the outer periphery of the wall 36, and the flange portion 5a of the stator shaft 5 is inserted into the bolt holes 37 together with the oil pump 7.
It is tightened and fixed to the transmission case 1 with.

Note that 38 is a thrust needle bearing interposed between the partition wall 1a and the reduction gear 31.

In addition, the flange portion 5a is as shown in FIG.
In order to avoid interference with the second reduction gear 30, a circular notch 5c is provided on a part of the outer periphery.

The above power transmission device has the following effects.

First, when the car is moving forward at low speed, power from the engine is transmitted to the transmission shaft 6 via the torque converter 3, and this circuit power causes the transmission shaft 6 to
As the upper input sun gear 9 rotates, the long pinion 13 meshes with the sun gear 9 and the short pinion 1 meshes with the pinion 13.
4 rotates. By the way, at this time oil pump 7
The brake band 27 tightens the clutch drum 21 with pressure oil from the pump, fixing the drum 21,
Along with this, the low sun gear 10 is fixed via the clutch flange 26 engaged with this drum 21, so the short pinion 14 revolves around the low sun gear 10, and the planetary carrier 12 is rotated at a predetermined reduction ratio. Rotate. At this time, the reverse clutch 19 is held in a free state without being connected by the piston 20, so the planetary carrier 12 rotates in the same direction as the transmission shaft 4.

As the carrier 12 rotates, the reduction gear 31 provided on the output shaft 11 extending from the carrier 12, the first and second reduction gears 29 and 30 provided on the idle shaft 28, and the differential gear The decelerated low-speed rotational power is transmitted to the drive shaft (not shown) through device B.

Further, when the vehicle is moving forward at high speed, the brake band 27 is strongly loosened and the clutch drum 21 is in a free state. On the other hand, at this time clutch drum 2
Pressure oil is sent into the piston 1 to advance the piston 23, thereby connecting the clutch 25 and integrating the clutch drum 21 and the disk hub 24 fixed to the transmission shaft 6. Therefore, the low sun gear 10 rotates on the clutch drum 21, that is, the transmission shaft 4, at the same time as the input sun gear 9, and the long pinion 13 and short pinion 14, which are meshed with these two sun gears 9 and 10, respectively, The transmission shaft 4 is held in a locked state without rotating and rotates as a whole.
and the output shaft 11 are in a direct connection state. Along with this, the drive shaft rotates at high speed.

Next, when traveling backwards, the piston 20 advances to connect the reverse clutch 19 and fix the reverse ring gear 17, and at this time the clutch 25 in the clutch drum 21 is released. Then, the long pinion 13 and short pinion 14 rotate in the same way as in the previous case, but since the reverse ring gear 17 is fixed, both pinions 13 and 14 rotate along the gear 17 in the opposite direction to the previous case. Along with this, the planetary carrier 12 is reversed, and the drive shaft is also reversed.

When the power transmission device is brought into neutral, the clutches 19 and 25 are released. Furthermore, when parking the vehicle, the parking lock gear 18 is fixed in the neutral state using a lock ball provided separately.

Since this invention has the above-described configuration, it has the following effects. That is, when processing and assembling the power transmission device of this invention, the bearing boss provided on the transmission case side that supports the output shaft of the planetary gear and the housing boss that fits closely into the flange portion of the stator shaft. By machining the transmission case and housing at the same time when they are overlapped, the axes between the two bosses can be aligned with high precision, and the stator shaft has its flange section aligned with the It is bolted directly to the transmission case with a tight fit in the boss hole of the housing.

Therefore, the bearing boss on the transmission case side that supports the output shaft of the planetary gear device with a bearing,
The axis of the flange part of the stator shaft that supports the reduction gear with a bearing, in other words, the axis of the output shaft bearing provided on the transmission case side and the axis of the bearing of the reduction gear located on the housing side are matched with high dimensional accuracy. Therefore, conventional problems such as difficulty in assembly, generation of abnormal noise, and shortened bearing life are eliminated.

In addition, the reduction gear is placed between the bulkhead of the transmission case and the flange of the stator shaft, and the outer circumference of the side of the reduction gear is supported by the flange using bearings, so the reduction gear can be placed in the same manner as the output shaft. Compared to the case where the bearing is supported on the transmission case side, a sufficient bearing space can be secured and no special bearing member is required, so the overall bearing structure can be simplified.

Furthermore, since the outer periphery of the side of the reduction gear is bearing, it is possible to use a large bearing having approximately the same diameter as the reduction gear, and the life of the bearing can be increased accordingly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the power transmission device according to the invention, FIG. 2 is a right side view of the transmission case, and FIG. 3 is a left side view of the housing. DESCRIPTION OF SYMBOLS 1... Housing, 1a... Boss hole, 2... Transmission case, 2a... Partition wall, 2c... Bearing boss, 3... Torque converter, A... Reduction gear device,
B... Differential gear device, C... Planetary gear device, 5... Stator shaft, 5a... Flange portion, 11... Output shaft, 31... Reduction gear, 32... Bolt, 34... Bearing.

Claims (1)

[Scope of utility model registration request] A torque converter, a planetary gear device, a reduction gear device disposed between the planetary gear device and the torque converter, a differential gear device that meshes with the reduction gear device, a housing that accommodates the torque converter, and a transmission that accommodates the planetary gear device. A power transmission device comprising a transmission case, a partition wall partitioning between a planetary gear set and a torque converter is integrally formed in the transmission case, and an output shaft of the planetary gear set is supported by a bearing on the partition wall, the stator of the torque converter A large-diameter flange portion is integrally molded at one end of the shaft, a reduction gear of a reduction gear device is disposed between the flange portion and the partition wall of the transmission case, and the reduction gear protrudes from the partition wall of the transmission case. It is spline-fitted to the output shaft of the planetary gear device, and the lateral outer periphery of the reduction gear is bearing-supported via a bearing in a bearing housing protruding from the flange portion of the stator shaft.
A housing housing the torque converter is provided with a boss hole, a flange portion of the stator shaft is closely fitted into the boss hole, and the outer periphery of the flange portion is directly bolted to the mating surface of the transmission case. Automotive power transmission system.