JPS616460A - 4-wheel driving transfer - Google Patents

Abstract

PURPOSE:To maintain the proper oil level in a driving mechanism and reduce the power loss due to the oil stirring by partitioning the gear change mechanism chamber of a 4-wheel driving transfer, rear chamber, and a driving mechanism chamber by partitioning walls and installing bearings and oil seals onto the partitioning walls. CONSTITUTION:The captioned 4-wheel driving transfer 40 consists of a fluid transmission gear chamber for housing a fluid transmission gear, change gear mechanism chamber, driving mechanism chamber 109 equipped with a driving mechanism for driving the output shafts 11 and 17 for driving front and rear wheels, and a rear chamber 110. Each chamber is partitioned by a casing wall, and oil seals 30 and 31 and bearings 25-27 are installed onto the walls. Therefore, the oil level in the driving mechanism chamber 109 can be certainly maintained, and the power loss due to the useless oil stirring can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a four-wheel drive transfer with an isolated transmission chamber.

[Prior art] A four-wheel drive transmission for a vehicle has a main transmission mechanism chamber housing a transmission to which an oil pan with a built-in valve body is connected at the bottom, a transmission mechanism, and a two-wheel/four-wheel switching mechanism. It consists of a transmission mechanism chamber that houses a transmission mechanism that transmits a first output shaft and a second output shaft, and a rear chamber that is formed around the output of the transmission mechanism chamber. A possible method is to connect adjacent chambers to supply lubricating oil to the mechanism, two-wheel/four-wheel switching mechanism, and transmission mechanism.

[Problems to be Solved by the Invention] The four-wheel drive transfer of the conventional vehicle four-wheel drive transmission having the above configuration has a transmission mechanism chamber, a rear chamber, and a transmission W18.
Since the chambers are not separated, there is a risk that the oil level in the transmission mechanism chamber will become high, resulting in an increase in oil temperature due to oil agitation and a decrease in transmission efficiency.

An object of the present invention is to provide a four-wheel drive transfer that maintains an appropriate amount of lubricating oil in a transmission mechanism that transmits power between a first output shaft and a second output shaft.

[Means for Solving the Problems] The four-wheel drive transfer of the present invention includes a transmission 'a compartment housing a transmission mechanism, which is separated from the transmission lli chamber, and a first output of the transmission mechanism. a transmission mechanism chamber housing a transmission mechanism for transmitting power between the shaft and the first output shaft and a second output shaft parallel to the shaft;
The rear chambers including the rear end portion of the output shaft are arranged in series, the rotary shaft is supported in the partition portion, and is isolated by an oil seal in the rotary shaft support portion.

Functions and Effects With the above configuration, the four-wheel drive transfer of the present invention has the following functions and effects.

b) By installing oil seals between the transmission mechanism chamber and the transmission mechanism chamber, and between the transmission mechanism chamber and the rear chamber to isolate the transmission II compartment, the amount of lubricating oil in the transmission a compartment can be ensured. Since leakage can be prevented, an increase in the temperature of the lubricating oil due to agitation of the oil during operation of the transmission mechanism and a decrease in the transmission efficiency of the transmission mechanism can be prevented.

口）You can save on lubricating oil.

[Embodiment] Next, a four-wheel drive transfer according to the present invention will be explained based on an embodiment shown in FIGS. 1 to 3.

In this embodiment, the four-wheel drive transfer (hereinafter referred to as transfer) 40 of the present invention is a four-wheel drive transmission 1 for a vehicle.
Applied to 00, vehicle 4-wheel drive transmission @ ioo is,
It is formed by a fluid transmission device case 101, a fluid transmission device chamber 102 that houses a fluid transmission device such as a torque converter fluid unit coupling, and a transmission case 103 to which an oil pan 105 having a built-in valve body is fastened. , the inputs of the gear transmission 104 housing the gear transmission 1 which is an automatic transmission, the extension case 18 and the front transmission mechanism case 19 are formed in 19a, and the planetary gear transmission Wi4.2 wheel 4 wheel switching. The transmission mechanism chamber 113 that houses the mechanism 8A, the output side 19b of the transmission mechanism case 19 in the front, and the manual power of the transmission + jltl case 20 in the rear are formed in the transmission mechanism case 19a,
A transmission that transmits power between the first output shaft 11 and the second output shaft 17 (
Transmission mechanism chamber 109 that houses b12, rear is Wa transmission MaM
4 Rear chamber 1 formed in the output wall 20b of the case 20
It consists of 10.

2 is the output of the gear transmission 1 and the transfer 4
0 is a human-powered shaft, 3 is a governor valve fixed to the human-powered shaft 2, 4 is a planetary carrier 41 spline-fitted to the rear end of the input shaft 2, and is rotatably supported by the planetary carrier 41. A double planetary gear set 42 consisting of an outer planetary pinion 48 and an inner planetary pinion 4B that mesh with each other, a sun gear 43 that meshes with the inner planetary pinion 4B, and a first output of the transfer 40 that meshes with the outer planetary pinion 4^. axis 1
1, a planetary gear transmission mechanism consisting of a ring gear 44 spline-fitted via the hub 1o; 5, a friction brake for engaging the sun gear 43 with the extension case 18 via the hub 6; 50, the extension case 18;
A hydraulic servo for the brake 5 is made up of a cylinder 18A formed inside the cylinder 18A and a piston 51 installed inside the cylinder 18A. It is a friction clutch operated by a hydraulic servo 70 consisting of 72, which engages and disengages the sun gear 43 and the ring gear 44.
It is spline-fitted to one sprocket 14 of the transmission mechanism 12 for driving the second output shaft 17 of the transfer 40, which will be described later, and is fitted on the outside while maintaining the coaxial center with the first output shaft 11. Connect the sleeve 9, which is the rotating shaft.
A friction clutch 80 for the two-wheel/four-wheel switching mechanism 8 is welded via a rib 91 to a sleeve 9 rotatably supported by the front transmission mechanism case 19 and the rear transmission mechanism case 20. To the cylinder 81 and the cylinder 81! ! i
17 is the other output shaft of the transfer 40; 12 is a sprocket 14 fitted with a spline to the sleeve 9; a sprocket 15 fitted with a spline to the output shaft 17; A transmission mechanism for the second output shaft 17 is composed of a chain 16 stretched between sprockets, 24 to 29 are bearing rings, 30 to 33 are oil seals, and 34 to 37 are seal rings.

Oil seals 30 and 31 are provided between the transmission mechanism chamber 113 and the transmission mechanism chamber 109 and between the transmission mechanism chamber 109 and the rear chamber 110.
By isolating the transmission mechanism chamber 113 by providing this, the flit lubricating oil amount (oil level Δ) in the transmission mechanism chamber 109 can be ensured and leakage of lubricating oil can be prevented.

This transfer device is attached to the automatic transmission mounted on the engine E of the vehicle shown in FIG.
The output shaft 11 is connected to a propeller shaft C for driving rear wheels, and the second output shaft 17 is connected to a propeller shaft B for driving front wheels. During normal driving, the hydraulic servo 70 is supplied with the line pressure supplied to the hydraulic control device of the automatic transmission to engage the clutch 7, and the hydraulic servo 50 and 80
The brake 5 and clutch 8 are released by discharging the pressure. As a result, the sun gear 43 and ring gear 44 of the planetary gear transmission mechanism 4 are connected, power is transmitted from the input shaft 2 to the first output shaft 11 at a reduction ratio of 1, and two-wheel drive driving with the rear wheels is obtained. When 4-wheel drive is required during this 2-wheel drive driving, operate a lever installed on the driver's seat, etc., actuate a hydraulic pressure supply/discharge control valve (not shown) to the hydraulic servo of the transfer device, and When line pressure is gradually supplied to the servo 80 and the clutch 8 is smoothly engaged, the ring gear 44 and the sleeve 9 are connected, and power is also transmitted to the front wheels via the transmission mechanism 12, output shaft 17, and propeller shaft B. Thus, four-wheel drive driving is achieved in which power is transmitted from the input shaft 2 to the first and second output shafts 17 and 11 at a reduction ratio of 1.

When an increase in output torque is required, such as on a steep slope during four-wheel drive driving, the hydraulic supply/discharge control valve to the hydraulic servo is activated to gradually supply line pressure to the hydraulic servo 50, and at the same time, the hydraulic servo 70 is activated at an appropriate timing. The hydraulic pressure is discharged, the brake 5 is gradually engaged, and the clutch 7 is smoothly released. As a result, the V ring gear 43 and ring gear 44 are released, and the sun gear 43 is fixed, and the power is transmitted from the input shaft 2 to the carrier 41, the outer planetary pinion gear,
It is decelerated and transmitted to the output shafts 11 and 17 via the inner planetary pinion 4B and the ring gear 44, and a four-wheel drive driving state with large torque is obtained. Table 1 shows brake 5,
The engagement and disengagement of clutches 7 and 8 and the running state of the vehicle are shown.

Table 1 In Table ■, O indicates the engaged state of the frictional engagement element, and × indicates the released state. The reduction ratio λ is the ratio of the number of teeth between the sun gear 43 and the ring gear 44 of the double pinion planetary gear mechanism, and the value of the reduction ratio is when λ is 045.

[Brief explanation of the drawing]

Fig. 1 is a side view of a four-wheel drive transmission for a vehicle to which the four-wheel drive transfer of the present invention is applied, Fig. 2 is a sectional view of the four-wheel drive transfer of the present invention, and Fig. 3 is a vehicle power It is a schematic diagram showing a transmission system.

Claims (1)

[Scope of Claims] 1) A transmission mechanism chamber that houses a transmission mechanism, a first output shaft of the transmission mechanism and a second output shaft that is separated from the transmission mechanism chamber and parallel to the first output shaft. A transmission mechanism chamber that houses a transmission mechanism that transmits the power, and a rear chamber that is separated from the transmission mechanism chamber and includes a rear end portion of the first output shaft are arranged in series, and the rotating shaft is supported in the partitioned portion. A four-wheel drive transfer characterized in that the rotary shaft support portion is isolated by an oil seal. 2) The first output shaft is provided coaxially and in series with the input shaft of the transmission mechanism, and is constantly transmitted with power from the input shaft during driving, and the second output shaft is provided when four-wheel drive driving is selected. 4-wheel drive according to claim 1, wherein the rotary shaft is a sleeve fitted on the outside of the first output shaft while maintaining a coaxial center with the first output shaft. transfer.