JPS6182070A - Four-wheel drive speed changer case - Google Patents

Abstract

PURPOSE:To easily align the axial center of an input and an output shaft, by coaxially holding a front case, front side link case, rear side link case and an extension housing by fitting and knock pin fitting. CONSTITUTION:A front side link case 7, having in its front end 71 an outside fitting surface 72 fitted to an internal peripheral fitting surface 69 provided in a rear end 68 of a front case 6, is faucet fitted. A rear side link case 8, connecting a front end surface 81 applying surface machining with a rear end surface 79 of the front side link case 7 having an almost equal plane shape to the front end surface 81 similarly applying the surface machining while coaxially holding the center by a plurality of knock pins 8N, is tightened by a bolt. And an extension housing 9, having in its front surface 91 an internal peripheral fitting surface 92 fitted to a peripheral fitting surface 89 provided in a rear end 88 of the rear side link case 8, is faucet fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a case for a four-wheel drive transmission mounted on a four-wheel drive vehicle.

[Prior Art] A four-wheel drive transmission is usually connected to the output shaft of a multi-stage or continuously variable main transmission, and includes a transmission mechanism that switches between a high gear and a low gear in four-wheel drive driving, and a four-wheel drive transmission. It has a switching mechanism for switching between drive running and two-wheel drive running, and a link 1Xlt 4M between a first output shaft that is always driven and a second output shaft that is driven only during four-wheel drive running. The four-wheel drive transmission case, which accommodates each component of the four-wheel drive transmission and rotatably supports the input shaft, the first output shaft, and the second output shaft, is difficult to assemble. It is divided into parts and fastened together with many bolts.

[Problems to be Solved by the Invention] However, in the conventional four-wheel drive transmission case, the means for aligning the axes between the divided cases was not sufficiently considered. It took time and effort to align the axes of power transmission shafts such as the output shaft, and it was troublesome to assemble each component.

An object of the present invention is to provide a four-wheel drive transmission case in which the axes can be aligned and the components can be easily assembled.

Means for Solving the Problem] The four-wheel drive transmission case of the present invention accommodates the transmission mechanism and is provided with a support wall that rotatably supports the front part of the first output shaft about the axis. The front case is connected to the rear end of the front case by fitting so as to maintain the same axis with the front case, and the front part accommodates a switching mechanism between two-wheel drive and four-wheel drive, and the rear 'F is coaxially located outside the first output shaft.
IF! ! a link that rotatably supports a hollow intermediate transmission shaft and a second output shaft parallel to the first output shaft at their front ends, and transmits transmission between the intermediate transmission shaft and the second output shaft; A front link case that covers the front side of the mechanism and a rear end of the front link case are fastened to each other with their coaxial cores held by knock pins, and the intermediate transmission shaft and second output shaft are connected to their rear ends. a rear link case that rotatably supports the link gate structure and covers the rear side of the link gate structure; and the rear link case is fitted to the rear end of the rear link case to hold the coaxial center and fastened, and the first output It consists of an extension housing that rotatably supports the rear end of the shaft.

[Operation and Effects of the Invention] The four-wheel drive transmission case of the present invention has the above-mentioned configuration, and the front case, the front link case, the rear link case, and the extension housing are fitted together, Coaxial centers are maintained through dowel pin fitting and bolts are used to connect them in series, making it easy to align the axes of transmission shafts such as the input shaft, first output shaft, and second output shaft, and to assemble the components. can.

[Example 1 is a multi-stage or continuously variable main transmission that is an automatic transmission,
Reference numeral 11 indicates an output shaft thereof, and reference numeral 2 indicates a four-wheel drive automatic transmission (hereinafter referred to as a transformer) which is attached to the output side and uses the output shaft 11 as an input shaft. The transfer 2 is connected to the input shaft 11. A first output shaft 21 is provided in series on the same axis as the input shaft, and always receives power from the input shaft during operation. The second output shaft 22, which is transmitted only when selecting the second output shaft 22, the first output shaft? It has a hollow intermediate transmission shaft 23 which holds a coaxial center at 1 and is fitted with Ti on the outside. Between the input shaft 11 and the first output shaft 21 are a multi-disc clutch C1, a multi-disc brake B1, a sun gear 31 spline-fitted to the outer periphery of the input shaft 11, and a front end of the first output shaft 21. A planetary gear set that includes a carrier 32 that is connected to a flange portion 211 and is engaged and disengaged from the sun gear 31 via the clutch C1, and a ring gear 33 that is coupled to and disengaged from the four-wheel drive transmission case via the brake B1. P1
A two-stage transmission mechanism 3 is provided which switches between a high gear position and a bottom gear position.

In this embodiment, between the intermediate transmission shaft 23 and the second output shaft 22, there is a drive sprocket E~41 which is spline-fitted and attached to the outer periphery of the intermediate part of the intermediate transmission tlJ shaft 23.
A link mechanism 4 is provided which includes a driven sprocket 42 integrally formed on the second output shaft and a transmission chain 43 interposed between these sprockets.

Between the first output shaft 21 and the intermediate transmission shaft 23, a two-wheel drive, four-wheel drive switching machine groove 45 consisting of a multi-plate clutch C2 is provided, and when the clutch C2 is engaged, the intermediate transmission @23
rotates integrally with the first output shaft 21, and the second output shaft 22 is driven via the link mechanism 4.

Each of these components of the transfer is manufactured by performing predetermined processing after molding by casting aluminum alloy, and includes the front case 6, front link case 7, rear link case 8, and extension housing 9. The four parts are divided into four parts and joined in series, each connected from the rear (right side in the figure) using a large number of bolts so that each part has a coaxial center.
It is housed in a wheel drive transmission case 5.

The front case 6 is fastened to the transmission case 12, which houses the main transmission 1, by bolts so that the front end surface 60 has a coaxial center, and the inside accommodates the transmission mechanism 3, and the rear end part has a cylindrical shape in the center. An outer cylindrical part 62 is provided on the outer periphery, and the outer cylindrical part 62 has a supporting wall 63 which is held between an inner peripheral wall step 65 and a clip 66. The front end of the first output shaft is rotatably held in the support 61 via the bushing 64, and the input shaft 11 is inserted into the center hole 212 at the tip of the first output shaft.
The rear end 111 of the is also maintained coaxially (it is rotatably supported).

The front link case 7 has the front case 6 at the front end 71.
It has an outer ring fitting surface 72 that fits into an inner circumferential fitting surface 69 provided at the rear end 68, and in this embodiment, it is held coaxially with the front case 6 by a spindle fitting. a cylindrical second support 13 fastened with bolts, housing the switching mechanism 45 in the front part and supporting a hollow intermediate transmission shaft 23 coaxially fitted onto the first output shaft 21 in the rear part; A cylindrical third support 74 for supporting the second output shaft 22 parallel to the first output shaft 21 is provided to protrude toward the rear, and a supporting wall 75 separates the switching mechanism 45 from the housing portion. The front end portion 23A of the intermediate transmission shaft 23 and the second output shaft 2
The front end portion 22A of the link mechanism 2 is rotatably supported via bearings (ball bearings) 7a and 7b, and the front end of the link mechanism 4 is covered.

The rear link case 8 has a front end surface 8 that has been subjected to flat processing.
1 is joined to the rear end surface 79 of the front link case 7, which is similarly plane-processed and has a planar shape substantially the same as the front end surface 81, and is held coaxially by a plurality of knock pins 8N. A cylindrical fourth support part 82 and a cylindrical fifth support part 83 are provided to support the intermediate power transmission shaft 23 and the second output shaft 22 at their rear ends. A support wall 85 that rotatably supports the second output shaft 21 at its rear ends 23B and 22B via bearings (roller bearings) 84 and 86 and separates it from a rear chamber 90 in the extension housing 9, which will be described later. has
A link mechanism chamber 90 is formed which covers the rear of the link case 4 and is separated from the front link case.

The extension housing 9 has an outer peripheral fitting surface 8 provided at the rear end 88 of the rear link case 8 on the front surface 91.
In this embodiment, the coaxial core is held by spin-in fitting and fastened with a bolt, and a cylindrical sixth support 93 provided at the rear end is used to connect the The rear part 213 of the first output shaft 21 is connected to a ball bearing 94.
It is rotatably supported through. Inside the extension housing 9 is a rear chamber 90 that is attached to the output shaft and in which a speedometer drive gear is provided.

S1 to S4 are oil seals fitted in various places,
dl is the lubricating oil supplied to the rear chamber 90.
This is an oil path for returning the oil to the oil pan 61 which is fastened to the lower surface of the oil pan 61.

By combining the components of the transfer 2 and the case 5 as in this embodiment, first the front case 6 is coaxially fastened to the transmission case 12, then the transmission mechanism 3 is assembled, and then the front case 6 is fastened coaxially to the transmission case 12. After coaxially fastening the link case 7, then assembling the link mechanism 4, then coaxially fastening the rear link case 8, and after assembling everything in the rear part 90, the extension The housing 9 can be coaxially fastened. This makes it extremely easy to assemble and disassemble the transfer.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the four-wheel drive transmission case of the present invention;
The figure is a front view of an automatic shift tilt of a four-wheel drive vehicle that combines a main transmission and a four-wheel drive transmission, and FIG. 3 is a sectional view taken along line A-A.

Claims (1)

[Scope of Claims] 1) A front case that houses a transmission mechanism and is provided with a support wall that rotatably supports the front part of the first output shaft around the axis; and a rear end of the front case. The front part accommodates a switching mechanism between two-wheel drive and four-wheel drive, and the rear part is connected to the outside of the first output shaft. A hollow intermediate transmission shaft loosely fitted coaxially and a second output shaft parallel to the first output shaft are rotatably supported at their front ends, and the intermediate transmission shaft and the second output shaft are a front link case that covers the front side of a link mechanism that transmits power between the intermediate transmission shaft and the second output shaft; a rear link case that rotatably supports the rear end portions of the link mechanism and covers the rear end of the link mechanism; A four-wheel drive transmission case comprising: an extension housing rotatably supporting a rear end portion of the first output shaft;