JPS6212680Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention provides two-wheel drive using one of the front and rear wheels and four-wheel drive using both. The present invention relates to a shift operation mechanism for a four-wheel drive transmission for an automobile that performs four-wheel drive that enables economical driving in the region.

[Conventional technology]

As the above-mentioned four-wheel drive transmission for automobiles, the one published in Japanese Utility Model Application Publication No. 101421/1983 is known, but conventionally, the shift operation mechanism in this type of transmission has not been connected to the drive selector for two wheels. The three shift positions for drive, high-speed range 4-wheel drive and low-speed range 4-wheel drive are arranged in a straight line, and the shifter oak of the clutch device for switching between 2 and 4 wheels is on one side of the shift rail from this drive selector, and on the other side. high,
The shifter arms for changing the low-speed range are each provided with an interlock mechanism to selectively operate one of them, and accent means of the ball lock mechanism give a sense of moderation to each shift position.

[Problem that the invention attempts to solve]

Therefore, in this type of system, the shift position of the intermediate high-speed range 4-wheel drive is simply positioned by the resistance of the ball lock mechanism, and the drive selector and shift rail are not clearly locked at that position. If you forcefully operate the drive selector in the opposite direction from the front or rear 2-wheel drive or low-speed 4-wheel drive position, the middle high-speed 4-wheel drive position will be skipped, and it will not work properly with a single operation. It may be difficult to shift to an intermediate position. Also, at this time, there is a limit to the degree of moderation provided by the ball lock mechanism at the intermediate position, making it difficult to determine the position. Misalignment may result in poor shifting.

[Means to solve the problem]

The present invention was developed to solve these problems, and connects three shift positions: 2-wheel drive, 4-wheel drive in the high-speed range, and 4-wheel drive in the low-speed range, to a drive selector provided in a straight line. A first shift rail is provided, and on both left and right sides of the shift rail,
A second shift rail for clutch operation to switch to 2- or 4-wheel drive, and a third shift rail for switching to an auxiliary transmission to switch to 4-wheel drive in high and low speed ranges are arranged in parallel. The 3rd shift rail is
A first shift piece and a second shift piece each having an engagement groove are provided, and a select arm that selectively engages with the engagement groove of the first shift piece and the second shift piece is rotated on the first shift rail. Furthermore, the select arm is provided with a spring that always urges the select arm to engage with the engagement groove of the first shift piece, and the select arm is moved to the second shift rail by operating a switch. Engagement operation from the engagement groove provided in the first shift piece of the third shift rail to the engagement groove provided in the second shift piece of the third shift rail that switches from high-speed 4-wheel drive to low-speed 4-wheel drive. It is constructed by providing a solenoid means for causing the

[Effect]

With the above configuration, when only the drive selector is operated, the select arm provided on the first shift rail connected to the drive selector is biased by a spring, and the second shift rail for clutch operation switches to 2- or 4-wheel drive. It engages with the engagement groove of the first shift piece, and switches between two-wheel drive and high-speed four-wheel drive at the intermediate shift position. By operating the switch at the intermediate position, that is, the four-wheel drive position in the high-speed range, the select arm provided on the first shift rail is rotated by the operation of the solenoid means, and the clutch switches between two and four-wheel drive. High from the second shift rail for operation,
Switches to 4-wheel drive in the high-speed range and 4-wheel drive in the low-speed range unless the drive selector is operated while the switch is engaged and the drive selector is operated while the switch is operated. In other words, the drive selector cannot be operated to the low-speed 4-wheel drive shift position unless the switch is operated. Therefore, each shift position of the drive selector and the first shift rail is Even if the drive selector and the first shift rail are provided in a straight line, positioning of the drive selector and the first shift rail at the intermediate shift position can be ensured, and skipping of the intermediate shift position can be completely eliminated.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. An example of a four-wheel drive transmission to which the present invention is applied will be explained in FIG.
A crankshaft 1 from the engine is connected to an input shaft 3 via a clutch 2, and this input shaft 3 is connected to a main drive shaft 5 via an auxiliary transmission 4, which controls a synchronization mechanism 6 of the auxiliary transmission 4. It operates to the left in the figure to obtain a high-speed range in which the shafts 3 and 5 are directly connected, and operates to the right to obtain a low-speed range in which the speed is decelerated via the counter gear 7. The main drive shaft 5 is connected to an output shaft 9 via a main transmission 8 that changes gears, for example, four forward speeds and one reverse speed, and one drive pinion 10 of this output shaft 9 is connected to a crown gear 12 of a front final reduction gear 11. Two-wheel drive is provided by the meshing front wheels. The other output shaft 9 extends rearward of the main transmission 8 and is connected to a rear drive shaft 15 via a transfer gear 13 and a clutch device 14 for switching between two and four wheels. By moving the gear 13 to the left side of the figure and connecting the gear 13 to the rear drive shaft 15, the power output from the main transmission 8 is further transmitted to the rear wheels via the rear drive shaft 15 to perform four-wheel drive. It is composed of

Next, referring to FIGS. 2 to 4, the shift operation mechanism of the present invention applied to the above-mentioned four-wheel drive transmission will be explained. At this point, the front end of a shift rail 18, which is a first shift rail whose rear end is connected to the rear drive selector 17, extends horizontally. Rails and shift rails 19 and 20, which are third shift rails, are movably supported and arranged in parallel. A shift piece 21 that is a first shift piece is integrally attached to the shift rail 19, and a shifter oak 22 that operates the clutch device 14 is provided thereon. A certain shift piece 23 is integrally attached and extends to the front sub-transmission 4 via an arm 24 and a rod 25 for operation.

A select arm 26 is attached to the shift rail 18 on the drive selector side, and its circumferential groove 27 is fitted into a fixing pin 28 on the shift rail side so that the select arm 26 can rotate through a predetermined angle and move integrally in the axial direction. One end 26a of the select arm 26 selectively engages with engagement grooves 21a and 23a formed on the inner sides of the shift pieces 21 and 23 to face each other. A spring 29 is biased at the other end 26b of the select arm 26 so that its one end 26a engages with the engagement groove 21a.
A solenoid 31 is installed to electrically connect to a switch 30 provided at 7. Furthermore, the above 2
The main shift rails 19 and 20 are regulated by an interlock mechanism 32 so that they do not operate at the same time.

With this configuration, in the two-wheel drive position where the drive selector 17 is tilted forward and the shift rail 18 is moved backwards the most, the switch 30 of the drive selector 17 is turned off and the spring 29 is turned off as shown in FIG. 5a. The select arm 26 is moved to the engagement groove 2 by the force of
1a, so the shift rails 18, 1
9 is engaged and the shift rail 19 is also moved rearward together with the shift rail 18 to release the clutch device 14. On the other hand, at this time, the shift rail 20, arm 24, rod 25, etc. are located at the rear on the right side, and a reversing mechanism (not shown) switches the sub-transmission 4 to a high-speed range, and the engine power is thus transferred through the clutch 2 and input shaft 3. The signal is transmitted as it is to the main drive shaft 5, is further changed in speed by the main transmission 8, and is transmitted from the output shaft 9 to the front wheel final reduction gear 11, thereby performing two-wheel drive using the front wheels. Then, the shift piece 21 of the shift rail 19 comes into contact with the stopper 33 on the housing side and is stopped, thereby being positioned and held.

Next, in the high-speed range four-wheel drive position where the drive selector 17 is slightly lifted with the switch 30 turned off as described above and the shift rail 18 is moved forward to the left, the shift rail 1 is moved forward as shown in FIG. 5b.
8, the shift rail 19 also moves forward, and the clutch device 14 is engaged by the shifter oak 22, and its position is determined by bringing the shift piece 21 into contact with the side surface of the driven gear 13a of the transfer gear 13. can no longer be operated backwards. On the other hand, since the shift rail 20 is maintained in the same state as described above, the output from the output shaft 9 of the main transmission 8 shifted in the high speed range is transferred to the transfer gear 13,
The power is also transmitted to the rear wheels via the clutch device 14 and the rear drive shaft 15, and high-speed four-wheel drive is performed by the front and rear wheels. By the way, at this time shift rail 1
The engagement grooves 21a and 23a are aligned with the shift pieces 21 and 23 of 9 and 20, and when the switch 30 of the drive selector 17 is turned on, the fifth
As shown in FIG. c, the select arm 26 is engaged with the engagement groove 23a by the solenoid 31, and the shift rail 18 is switched and coupled to the shift rail 20.
Therefore, when the drive selector 17 is rotated further rearward with the switch 30 turned on as shown in FIG. 20 moves forward and a reversing mechanism (not shown) switches the auxiliary transmission 4 to a low speed range, thereby transmitting the output from the output shaft 9 of the main transmission 8 shifted in the low speed range to the front and rear wheels. All-wheel drive is provided at low speeds.

By operating the drive selector 17 in the opposite manner to the above, the gears are changed from low-speed range 4-wheel drive to intermediate high-speed range 4-wheel drive to 2-wheel drive, and in the intermediate and rear positions, the shift piece 23 is moved toward the housing side. The drive selector 17 is positioned together with the shift rail 20 by coming into contact with the stoppers 34 and 35 and acting as a stopper.

[Effect of idea]

As described above, according to the present invention, the intermediate position of the first shift rail 18 connected to the drive selector 17 in which the shift positions of two-wheel drive, four-wheel drive in a high-speed range, and four-wheel drive in a low-speed range are provided in a straight line, By operating the switch 30 in the four-wheel drive position in a high-speed range, the select arm provided on the rail is rotated by the operation of the solenoid 31, and the clutch device 1 is rotated.
The second shift rail 19 for the operation of the sub-transmission 4 is switched and engaged with the third shift rail 20 for the operation of the sub-transmission 4, and by operating the drive selector 17 while operating the switch 30, the sub-transmission is switched. 14
Therefore, unless the switch 30 is operated and the drive selector 17 is operated, the auxiliary transmission 4 cannot switch from high-speed 4-wheel drive to low-speed 4-wheel drive, that is, the switch 30 is not operated. As long as drive selector 17 is set to 4 in the low speed range
Therefore, even if the shift positions of the drive selector 17 and the first shift rail 18 are provided in a straight line, the drive selector 17 and the first shift rail 18 cannot be operated to the wheel drive shift position. Jumping of intermediate positions is completely eliminated, and erroneous operations due to jumping of intermediate positions can be prevented.

[Brief description of the drawings]

Fig. 1 is a skeleton diagram showing an example of a transmission device to which the present invention is applied, Fig. 2 is a partially sectional plan view of an embodiment of the mechanism according to the present invention, and Fig. 3 is a Z-Z diagram of Fig. 2. 4 is a partial perspective view, and FIGS. 5 a to 5 d are plan views of main parts showing various operating states. 4... Sub-transmission, 14... Clutch device, 17
... Drive selector, 18 ... Shift rail (first shift rail), 19 ... Shift rail (second shift rail), 20 ... Shift rail (third shift rail), 21 ... Shift piece ( 1st shift piece), 23...shift piece (second shift piece) 21a, 23a...engaging groove, 26...select arm, 29...spring, 30...switch, 31... solenoid.

Claims (1)

[Scope of utility model registration request] A first shift rail is provided that connects three shift positions: two-wheel drive, four-wheel drive in the high-speed range, and four-wheel drive in the low-speed range to a drive selector provided in a straight line. , a second shift rail for clutch operation to switch to four-wheel drive, and a third shift rail for switching to an auxiliary transmission to switch to four-wheel drive in high and low speed ranges are arranged in parallel, and these second and third shift rails are arranged in parallel. The shift rail includes first and second shift pieces each having an engagement groove,
The first shift rail is rotatably provided with a select arm that selectively engages with the engagement grooves of the first and second shift pieces, and the select arm is provided with a select arm that is always connected to the first shift rail. A spring is provided that urges the shift piece to engage with the engagement groove, and when the switch is operated, the select arm is moved from the engagement groove provided in the first shift piece of the second shift rail in the high-speed range. A speed change operation mechanism comprising a solenoid means for engaging an engagement groove provided in a second shift piece of a third shift rail for switching four-wheel drive to four-wheel drive in a low speed range.