JPH0392646A - Gear supporting structure for automatic transmission shaft - Google Patents

Abstract

PURPOSE:To reduce a distance between both gears and a diameter of supporting bearings to reduce a built-in space by supporting a counter gear and a pinion gear with a first and a second bearings in the position respectively outer than both the gears on a counter shaft. CONSTITUTION:A first and a second bearings 76, 77 are respectively engaged with the outer sides opposite to both a counter gear 56 and a pinion gear 60 on a counter shaft 60a to support both the gears 56, 60 on the counter shaft 60a, and both the gears 56, 60 are supported by a transmission case 44 through the bearings 76, 77. A distance between the gears 56, 60 is thereby shortened to the necessary and minimum dimension for installation of an oil seal 75, while the bearings 76, 77 of which diameter is shortened are positioned in the outer sides opposite to both the gears 56, 60, namely both ends of the shaft, and the built-in space is reduced to make the structure compact.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a gear support structure for an automatic transmission, particularly a counter gear and a double on gear on a counter shaft provided with an oil seal of an automatic transaxle. This invention relates to a gear support structure supported on a transmission case.

(Prior technology) A front engine/front wheel drive vehicle (FF vehicle) that incorporates an O1, a machining gear, a lance axle discharge gear transmission mechanism, and a differential gear into one unit.
Ya, rear engine/rear wheel drive vehicle (RR vehicle)
used for.

By the way, such a transmission system is normally placed horizontally (extending in the vehicle width direction) together with the engine. Therefore, the power shifted on the main axis is not directly input to the differential gear.
The differential gear is located at a position far away from the center between the left and right drive wheels, resulting in the inconvenience that the axle lengths of the left and right drive wheels are significantly different. For this reason, normally, the power shifted on the main axis is returned by a countershaft parallel to this main axis, and then sequentially passed through a final drive pinion provided at the corresponding end of the countershaft and a final drive ring gear that meshes with this pinion, and then transferred to the differential. Make sure to communicate with others.

As such an automatic transaxle,
For example, there is an A140 type automatic transmission manufactured by Toyota Motor Corporation, and in this automatic transmission, as shown in the partial cross-sectional view of FIG. 3, a counter gear 81 is spline-fitted to a counter shaft 80. A pinion gear 83 is provided at the end corresponding to the final drive ring gear 82, and the counter gear 81 and pinion gear 83 are connected to the transmission case via bearings (tapered roller hair rings) 84 and 85 provided on opposing inner surfaces, respectively. It is supported by 86.

A mounting flange 87 that supports the bearing 85 is fitted into the transmission case 86, and an oil seal is provided between the mounting flange 87 and the counter shaft 80 to separate transmission oil and differential mechanism oil. 88
is inserted. Further, a circle ring 89 and a snap ring 90 are installed between the mounting flange 87 and the transmission case 86.

The counter shaft of this A140 type automatic transmission is assembled as follows. That is, the counter shaft 80 with the bearing 85 assembled is press-fitted into the transmission case 86 from the left in the figure in the direction of arrow C, and then the mounting flange 87 is inserted together with the oil ring 88 and the O-ring 89. Fix with Sunasopring 90. Next, the outer race of the hair ring 84 is fitted into the transmission case 86, and the counter gear 81 is spline-fitted to the counter shaft 80 with the inner race of the hair ring 84 assembled, and then Engage nuts 1 and 91. By tightening this nut 91, the hair ring 8
4. Preload is added to 85.

(Problem to be Solved by the Invention) However, in this 8140 type automatic transmission, the hair ring 84. Since the counter gear 81 and pinion gear 83 are supported by the counter gear 81 and pinion gear 83 on the opposing inner surfaces of both gears, at least the hair ring 84.85 is provided in addition to the oil seal mounting space. 85 and mounting flange 87
space is required, the distance between the gears increases, the axial length of the counter shaft 80 increases, and gears with large radial dimensions are located near both shaft ends, resulting in a disadvantage in terms of assembly space and making it compact. It becomes difficult to In addition, since the assembly direction is limited (arrow C in Fig. 3), the diameter of the assembly space provided within the transmission case 86 (d in Fig. 3) is limited.
) must be larger than the diameter of the pinion gear 83. In order to support the bearing 85, which has a diameter smaller than the pinion gear diameter, a mounting flange 87 is provided as a separate member, and the transmission case 86 and the mounting flange 87 are During this time, it is necessary to insert an ○ ring 89 as a mechanical seal, which, together with the fact that the diameter of the bearing 84 increases as the diameter d of the assembly space increases, leads to an increase in costs. Furthermore, the snap ring must be installed at the back of the transmission case, making installation difficult.

It is an object of the present invention to solve the above-mentioned problems by changing the gear support position on the counter shaft by the hair ring from the inner side to the outer side where the counter gear and pinion gear face each other.

(Means for Solving the Problems) For this purpose, the gear support structure of the automatic transmission of the present invention includes a counter that meshes with the output gear of the auxiliary transmission and is supported by the transmission case via the first bearing. a gear; a pinion gear coupled to the counter gear via a counter shaft and supported by the transmission case via a second bearing;
In the automatic transmission comprising an oil seal disposed on the countershaft and separating transmission oil and differential mechanism oil, the gear support position on the countershaft by the first and second bearings is: It is characterized in that the counter gear and the pinion gear are located on the outer side of each of the gears.

(Function) In the automatic transmission of the present invention, power transmitted from the engine to the input shaft via the torque converter passes through the chain sprocket and the chain in sequence, reaches the transmission axis, and is transmitted to the main transmission and the six sub-transmissions. The output member of the auxiliary transmission on the transmission shaft, the output gear, the counter gear on the counter shaft, the pinion gear, and the center drive ring gear on the Freon 1 output axis are sequentially passed through to the center differential gear and front differential gear. The output is then distributed to drive the front and rear wheels.

Here, in order to support the counter gear and pinion gear on the countershaft, first and second hair rings are fitted on the opposite outer surfaces of the two gears on the countershaft, and the hair rings are inserted through these bearings. both gears are supported by the transmission case.

As a result, the distance between the gears can be shortened to the minimum required size for installing an oil seal, and the bearings with a reduced diameter can be positioned on the opposite outer surfaces of the gears, that is, closer to the ends of both shafts. Compactness can be achieved by reducing space. Also, although the installation direction is limited, because the pinion hair ring (second hair ring) is located deeper in the transmission case than the pinion gear {jj+1}, it is possible to eliminate the conventional mounting flange and ○ ring. This allows the diameter of the counter gear hair ring (first hair ring) to be reduced based on the shape of the bearing fitting opening provided in the transmission case, and together with this, costs can be reduced. Furthermore, by eliminating the conventional snap ring, ease of assembly can be improved.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a partial sectional view showing an embodiment of the gear support structure for an automatic transmission according to the present invention, and FIG.
2 is a cross-sectional view showing the structure of an automatic transaxle; in FIG. 2, reference numeral 10 indicates an automatic transaxle, and reference numeral 12 indicates a gear transmission mechanism (transmission). Figure 2 is a cross-sectional view of this transaxle taken along a plane that includes the input shaft, transmission shaft, idler shaft, and output shaft of the differential, and Figure 1 shows the details of part A in Figure 2, that is, the gear support part. show.

First, the overall structure of the automatic transaxle 10 will be explained with reference to FIG. 2. A torque converter 16, an oil pump 18, a stator shaft 20, and a subrocket 22 are arranged on the axis of the input shaft 14. The human power shaft 14 passes through the stator shaft 20, and a crumple hub and sprocket 22 of a 1-lux converter 16 are spline-fitted near both ends thereof, respectively. The stator shaft 20 passes through the sleeve of the torque converter 16, the oil pump 18, and the sprocket 1/support wall 24, and pivotally supports the sprocket 22 via a bearing 26 provided at its open end. A chain 30 is installed between the sprocket 22 and the sprocket 28 on the transmission side, and the engine power that has passed through the torque converter 16 is transferred to the input shaft 1.
4 on the transmission axis 32 parallel to the transmission axis 32.

On the transmission axis 32 is a transmission main shaft 32 as a transmission shaft.
a and transmission sub! A subrocket and a main transmission are arranged on the axis of the transmission main shaft 32a, and a part of the main transmission and a sub-transmission are arranged on the axis of the transmission subshaft 32b. Place machine 36.

One end of the transmission main shaft 9 32a that passes through the subrocket 1 to the support wall 24 is inserted into the opening of the transmission subshaft 32b, and the other end is connected to the sprocket 28 and the hair ring 38.
+tg is supported on the sprocket support wall 24 via.

Main transmission Ia. 34 is equipped with two sets of planetary gears and various frictional elements (clutches and brakes), and a plurality of gears can be obtained by selective hydraulic operation of these frictional elements, which are transmitted to the transmission main shaft 32a. The power is transmitted to the transmission subshaft 32b after changing the speed according to the selected gear position. The transmission subshaft 32b is pivotally supported on a case 44 via a bearing 40 and a sub bearing member 42, and a bearing 46
It is pivotally supported to the sub-transmission gate 48 via. Sub-transmission 36
The motor is equipped with a set of planetary gears and various friction elements (clutches and brakes), and is brought into a non-linear and linear viscosity state due to selective hydraulic operation of these friction elements. Therefore, the 11 dynamic transmission 12 as a whole has 5 forward speeds and 5 forward speeds as shown in Table 1.
It is possible to obtain a first reverse gear.

The output drum 50 of the auxiliary transmission 36 and the output gear 52 that is spline-fitted with the output drum are arranged near the center of the automatic transmission 12, and the output gear 52 is connected through the hair ring 54. The counter gear 5 is pivotally supported on the transmission subshaft 32b.
6, and the counter gear 56 is spline-fitted to the idler pinion gear 60 on the idler axis 58. The output of the auxiliary transmission 36 is taken out from between the main transmission and the auxiliary transmission through an output drum 50, an output gear 52, and a counter gear 56 in order, and reaches an idler pinion gear 60, which is connected to a center gear that meshes with the idler pinion gear 60. It is sequentially transmitted to the center differential gear 66 and the front differential gear 1 1 gear 68 on the axis of the front output shaft 64 via the drive ring gear 62, and is distributed and output to the Freon l/output shaft 64 and the rear output shaft 70. This differential mechanism uses a viscous force that limits the differential function of the differential gear.
It also has 2. Furthermore, due to constraints on the installation space (e.g. engine room), it is necessary to keep the axial dimension as short as possible even if the radial dimension increases slightly, and for this purpose, the engine, The torque converter and gear shift mechanism are arranged in parallel rather than in series, and a structure is adopted in which the structural elements are piled up in the radial direction.

Next, the parts of the automatic transaxle according to the invention will be explained in detail with reference to FIG.

The output gear 52 of the sub-transmission is meshed with a counter gear 56, and an idler pinion gear 60 is formed in the counter gear 56. It is spline-fitted to the eyelet support (counter support) 60a. The pinion gear 60 meshes with a center drive ring gear 62 coupled to a center differential gear 66.

An oil seal 75 is provided between the counter gear 56 and the idler pinion gear 60.
5, the idler shaft 60a has a pole portion, and the transmission
A flange portion abuts against the shaft 44 to separate the transmission oil on the right side in the figure from the differential mechanism oil on the left side in the figure.

” Two-way untag gear 56 and idler pinion gear 6
76. Hair ring (Taber roller bearing in this example) to support 0. 77, outer lace 76a7
7a abut against the transmission case 44 and the auxiliary transmission case 48, respectively, and the inner races 76b. 77b are fitted into contact with the outer surfaces of the idler pinion gear 60 and the counter gear 56, respectively.

The idler shaft of this automatic transmission is assembled as follows. That is, first, the idler shaft 60a is press-fitted into the transmission case 44 from the right side in the figure in the direction of arrow D, together with the tapered roller bearing 76 that comes into contact with the outer side of the idler pinion gear 60, and then the oil seal 61 is inserted into the idler shaft. 60a and the transmission 13 are directly press-fitted between the machine case 44. Next is Kaunk Gya 5
6 is spline-fitted to the idler shaft 60a, and a ring 77 is attached to the tapered roller that comes into contact with the outer surface side of the idler shaft 60a.
It also fits into the opening of the sub-transmission case 48. This auxiliary transmission gate 48 is bolted to the transmission gate 44, so by tightening this hole 1-, the tapered roller hair ring 76. 77 has a brilord added to it.

In this automatic transmission 10, the output output position of the gear transmission mechanism 12 is set approximately in the middle of the transmission axis 32 based on the above-mentioned request for shortening the axial dimension. This is because when the layout of the idle shaft section is the same as the conventional example (A140 type automatic transmission a), the output extraction gear is offset in the axial direction with respect to the gear transmission mechanism, and the transmission subshaft 32b
Since it is located near the shaft end of the
In addition to causing twisting due to
In order to solve these problems, it is preferable to take out the output at the intermediate portion as described above, and it also meets the requirement of unifying the entire automatic transmission l4 with a combination I.

By reducing the distance between the counter gear and the idler pinion gear and the diameter of the supporting bearing in this manner, it is possible to reduce the installation space and achieve a compact design. Furthermore, costs can be reduced by eliminating the mounting flange and O-ring of the conventional example and by reducing the diameter of the supporting hair ring. Furthermore, by eliminating the conventional snap ring, ease of assembly can be improved.

(Effects of the Invention) Thus, as described above, the gear support structure of the automatic transmission of the present invention changes the force by the bearing and the gear support position on the sinter shaft from the inner surface side to the outer surface side where the force counter gear and pinion gear are opposed, respectively. Because of this change, by reducing the distance between the two gears and the diameter of the supporting hair ring, the installation space can be reduced and compactness can be achieved, and the mounting flange and O-ring of the conventional example can be eliminated. Furthermore, by reducing the diameter of the supporting hair ring, it is possible to reduce costs, and furthermore, by eliminating the conventional snano pull ring, it is possible to improve the ease of assembling.

[Brief explanation of drawings]

Section 1 Figure (Gear support of l'l dynamic transmission invented by Yoki J.+In
．． A partial cross-sectional view showing one embodiment of Nil. Figure 2 is a cross-sectional view showing the entire automatic transmission using the same example + 14 commandments. Figure 3 is a partial cross-sectional view showing the gear support structure of a conventional automatic transmission. It is a diagram. 10... Automatic transmission (O1, Matic 1, Lance axle) 12... Gear transmission mechanism (transmission) 44... Socket transmission case 48... Sub-transmission gear 52... Sub-transmission Machine output gear 56...Counter gear 58...Counter axis 60...Idler pinion gear 60a...Counter shaft (idler shaft) 75...Oil seal 76. 77...Bearing (Taber roller bearing) C11◆

Claims (1)

[Claims] 1. A counter gear that meshes with the output gear of the sub-transmission and is supported by the transmission case via a first bearing, and a second bearing coupled to the counter gear via a counter shaft. an automatic transmission comprising: a pinion gear supported by a transmission case via a pinion gear; and an oil seal disposed on the counter shaft to separate transmission oil and differential mechanism oil. A gear support structure for an automatic transmission, characterized in that the gear support position on the counter shaft by the bearing is on the outer side of each of the counter gear and the pinion gear.