JPS6182050A - Planetary gear apparatus for subtransmission for 4-wheel drive - Google Patents

Abstract

PURPOSE:To reduce the generation of gear noise by using helical gears for the sun gear, pinion, and the ring gear of the planetary gear apparatus of a subtransmission for 4-wheel drive. CONSTITUTION:A planetary gear apparatus 4 is spline-fitted onto the outer peripheral part at the rear edge of an input shaft 2, and consists of a sun gear 410 having a helical gear 411 formed on the outer periphery and the helical gear 421 corresponding to the helical gear 411 of the sun gear 410 on the outer periphery meshed with the sun gear 410. Further, the helical gear 431 corresponding to the helical gear 421 of a pinion 420 is formed. Further, when also a ring gear 430 is formed into a helical gear, the generation of gear noise can be reduced markedly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a planetary gear device that outputs power input into a four-wheel drive sub-transmission as at least two or more types of reduction ratios.

[Prior Art] A four-wheel drive 0 [transmission consists of an auxiliary transmission case, an input shaft that inputs the output of the main transmission, a sun gear attached to the outer periphery of the input shaft, and a sun gear that meshes with the sun gear. A pinion, a ring gear that meshes with the pinion, a carrier that rotatably supports the pinion and is connected to an output shaft on one side that drives one of the front wheels or the rear wheels, and a carrier that drives the sword output shaft. It consists of an output shaft on the other side that drives the other side of the front wheel or rear wheel, a clutch that connects and connects the input shaft or ring gear and the carrier, and a brake that connects and connects the ring gear and the transmission case. engage,
When the brake is released, a reduction ratio of the input shaft rotation speed 1 to the first output shaft rotation speed 1 is obtained, and when the clutch is released and the brake is engaged, the input shaft rotation speed 1 is obtained to the first output shaft rotation speed 1+1. A reduction ratio of /r (r=number of teeth of sun gear ÷ number of teeth of ring gear) is obtained. The conventional sun gear, pinion, and ring gear used in this planetary gear device are linear gears (spur gears) that are easy to mold.

[Problems to be Solved by the Invention] In the conventional technology shown above, the sun gear of the planetary gear device,
Since each gear of the pinion and ring gear is a straight gear, the gear noise generated by rubbing against each other when each gear engages and disengages is lower than that of other helical gears, screw gears, etc. It had major drawbacks.

In addition, when a helical gear is applied to each gear of a planetary gear system, If the load S is applied in the direction, S = F-ta
When the torsion angle of the helical helical (nθ/CO3α) is increased, the load applied to the inner circumferential direction of the pinion increases, which reduces the durability of the bearings placed between the pinion and the carrier. had.

An object of the present invention is to provide a four-wheel drive sub-transmission with less gear noise by using helical gears as the sun gear, pinion, and ring gear of a planetary gear system.

[Means for Solving the Problems] In order to solve the above problems, the planetary gear device of the sub-transmission for four-wheel drive according to the present invention includes an input shaft that receives the output of the main transmission as an input, and the input shaft. One side output shaft that drives one side of the front wheel or the rear wheel provided coaxially with the blade, and receives the power of the sword output shaft, and receives the drive of the sword output shaft of the front wheel or the rear wheel. the other side output shaft that drives the side that is not
a sun gear disposed between the input shaft and the sword output shaft, which outputs at least two or more types of reduction ratios to the sword output shaft by switching the transmission direction of the power transmitted from the input shaft; A four-wheel drive sub-transmission comprising a pinion that meshes with the sun gear, a ring gear that meshes with the pinion, and a planetary gear device that includes a carrier that rotatably supports the pinion, wherein the sun gear, pinion, and Each gear of the ring gear is configured as a helical gear that meshes with each other.

[Operations and Effects of the Invention] The planetary gear device for a four-wheel drive sub-transmission of the present invention having the above-mentioned configuration has the following advantages: By using helical gears, the generation of gear noise can be suppressed.

[Effects of Example] The helix angle of the helical gear applied to the planetary gear device is 10
By setting the angle to 0 to 20 degrees, it is possible to prevent an increase in load on bearings disposed between the pinion and a carrier that rotatably supports the pinion, and to maintain high durability.

[Embodiment] Next, a supporting groove of a power transmission rock structure of a four-wheel drive transmission according to the present invention will be explained based on an embodiment shown in the drawings.

FIG. 1 shows a sectional view of an automatic transmission for four-wheel drive to which the planetary gear device of the sub-transmission for four-wheel drive of the present invention is applied.

The auxiliary transmission 1 has an input shaft 2 that is the output shaft of a main transmission (not shown), and a first output shaft 3 that is arranged in series with the input shaft 2 and drives a rear wheel shaft, which is an output shaft on one side. A planetary gear device 4 disposed between the input shaft 2 and the first output shaft 3;
A second output shaft 5 that drives the front wheel axle, which is the other output shaft arranged parallel to the output shaft 3, and a four-wheel drive shaft that is slidably fitted on the outer periphery of the first output shaft 3. The transmission mechanism 6 includes a transmission mechanism 6 that transmits the power of the sleeve 61 to the second output shaft 5, and an auxiliary transmission case 7.

The planetary gear device 4 includes a helical gear 410 that is spline-fitted to the outer circumference of the rear end of the input shaft 2 and has a helical gear 411 with a helix angle of 15 degrees formed on the outer circumference, and the sun gear 410. A helical helical 421 corresponding to the helical helical 411 of the sun gear 410 is formed on the outer periphery that meshes with the pinion 420, which is a helical gear, and the inner periphery that meshes with the pinion 420 is formed as a helical gear. A helical helical 431 corresponding to the helical helical 421 is formed, and the ring gear 4 is a helical gear.
30, and the pinion 420 is connected to a needle roller 441.
The carrier 440 includes a pinion shaft 442 that is rotatably held via a pinion shaft 442 and a shaft support portion 443 that connects the pinion shaft 442 to the outer periphery of the tip of the first output shaft 3.

Clutch C1 that engages and disengages the sun gear 410 and carrier 440; Brake BI that engages and disengages the subtransmission case 7 of the subtransmission 1 and the ring gear 430; and engagement between the first output @3 and the sleeve 61; It consists of a clutch C2 that engages and disengages.

The transmission mechanism 6 includes a sleeve 61 that is rotatably fitted around the outer periphery of the first output shaft 3, a sprocket wheel 62 that is a rotary transmission member provided on the outer periphery of the sleeve 61, and a sprocket wheel 62 that corresponds to the sprocket wheel 62. and the second output shaft 5
It consists of a sprocket 63 that is integrally provided on the outer periphery of the wheel, and a chain 64 that transmits power from the sprocket wheel 62 to the sprocket 63.

Clutch C1 is a wet multi-disc friction engagement clutch that is disposed on the sub-transmission case 7 side of planetary gear device 4 and connects and connects sun gear 410 and carrier 44G.
0, the pawl 9 is connected to the parking gear 8 in sliding contact with the parking gear 8 on the outer peripheral side thereof, and the pawl 9 meshes with the parking gear 8 when the shift lever of the automatic transmission is selected to the parking position. A hydraulic servo C-
1.

Brake B1 connects ring gear 430 to sub-transmission case 7
This is a wet multi-disc II engagement brake for engaging the brake cylinder 13, which is disposed within the sub-transmission case 7 and formed on one side of the center support 11 that rotatably supports the first output shaft 3. and a brake piston 14 mounted within the brake cylinder 13, and is operated by a hydraulic servo 3-1.

The clutch C2 is a wet multi-disc friction engagement clutch for connecting and disconnecting the first output shaft 3 connected to the carrier 440 and the sleeve 61 of the transmission mechanism 6 for driving the second output shaft 5. It is composed of a hydraulic cylinder 15 rotatably supported on the outer periphery of an inner cylinder, and a clutch piston 16 mounted inside the hydraulic cylinder 15.
-2 is activated.

17 is the hydraulic servo C-1, C-2 of the clutch C1 clutch C2 of the auxiliary transmission R1 and the brake B1 for four-wheel drive.
and a sub-transmission hydraulic control device 170 for supplying and discharging hydraulic oil to and from B-1 (with several valve bodies, 1
71 is its oil pan.

Hydraulic oil supplied to the hydraulic servos C-1, C-2 and 3-1 is supplied to the sub-transmission hydraulic control device via an oil passage 172 provided in communication with the main transmission case and the sub-transmission case 7. 1
It is guided to the sub-transmission valve body 17 provided within the auxiliary transmission valve body 70 .

During normal running, line pressure is supplied to the hydraulic servo C-1 through the oil passage 18 to engage the clutch C1, and the hydraulic servo C-1 is engaged.
-1 and C-2 to release brake B1 and clutch C2. As a result, the sun gear 410 and carrier 440 of the planetary gear device 4 are connected, power is transmitted from the input shaft 2 only to the first output shaft 3 at a reduction ratio of 1, and a two-wheel drive driving state with only the rear wheels is obtained. At this time, the power from the input shaft 2 is transmitted from the carrier 440 to the first output shaft 3 via the coupling member 19 fixed to the sun gear 410 and the clutch C1 without passing through the binion 420 and the ring gear 430. At this time, when the driver desires four-wheel drive driving, a shift lever (not shown) provided on the driver's seat etc.
is manually shifted, the sub-transmission hydraulic control device 170 operates to gradually supply line pressure to the hydraulic servo C-2, and when the clutch C2 is engaged, the first output shaft 3 and the sleeve 61 rotate at the same time. The power is transmitted to the second output shaft 5 via the sprocket wheel 62, the chain 64, and the sprocket 63, and the power is transmitted to the input shaft 2, the first output shaft 3, and the second output shaft 5 at a reduction ratio of 1, A driving state in which four-wheel drive is directly connected can be obtained. During this four-wheel drive driving, when the shift lever is manually shifted when an increase in output torque is required, such as on a steep slope, line pressure is gradually supplied to the hydraulic servo 3-1, and at an appropriate timing, the hydraulic pressure of the hydraulic servo C-1 is increased. exhausts pressure, engages brake B1, and engages clutch C.
Release 1. As a result, sun gear 410 and carrier 440 are released, ring gear 430 is fixed to sub-transmission case 7, and power is transmitted from input shaft 2 to sun gear 410.
, the pinion 420, and the carrier 404, and is transmitted to the first output shaft 3 and the second output shaft 5, thereby obtaining a low-speed four-wheel drive state with a large reduction ratio.

Table 1 shows the manual shift setting range of the auxiliary transmission, the engagement and disengagement of the clutches C1 and C2, the brake B1, and the running state of the vehicle.

Table 1 In Table 1, ◯ indicates the engaged state of the friction engagement element, and × indicates the released state. The reduction ratio r indicates the number of teeth of the sun gear 410 of the planetary gear device 4/the number of teeth of the ring gear 430.

In this embodiment, power is transmitted between the sprocket wheel 62 and the sprocket 63 of the second output shaft 5 by the chain 64, but the power may be transmitted through a gear.

In the above embodiment, the support mechanism of the power transmission mechanism of the four-wheel drive transmission fold of the present invention is a part-time four-wheel drive transmission in which two-wheel drive and four-wheel drive are switched by switching the engagement and disengagement of clutch C2. Although an example in which the present invention is applied to a vehicle is shown, the present invention may also be applied to a full-time four-wheel drive transmission that constantly transmits power to four wheels.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a sub-transmission equipped with a planetary gear device for a four-wheel drive sub-transmission according to the present invention.

Claims (1)

[Scope of Claims] 1) An input shaft that inputs the output of the main transmission, an output shaft that drives one of the front wheels or the rear wheels that is provided coaxially with the input shaft, and the one side output shaft that drives one of the front wheels or the rear wheels. Disposed between the input shaft and the output shaft on the other side, which receives power from the output shaft on the other side and drives the side of the front or rear wheels that does not receive the drive from the output shaft on the one side. By switching the transmission direction of the power transmitted from the input shaft, at least two
A four-wheeled planetary gear device comprising a sun gear that outputs a reduction ratio of at least 100% to the one side output shaft, a pinion that meshes with the sun gear, a ring gear that meshes with the pinion, and a carrier that rotatably supports the pinion. A planetary gear system for a four-wheel drive sub-transmission, wherein each of the sun gear, pinion, and ring gear of the planetary gear system are helical gears that mesh with each other. 2) The four-wheel drive according to claim 1, characterized in that the helical gears of the sun gear, pinion, and ring gear of the planetary gear device have helical angles within an angle of 10° to 20°. Planetary gear device for sub-transmission.