JPS6242583Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transfer case for a four-wheel drive vehicle that has a simple configuration.

As a conventional transfer case for a four-wheel drive vehicle, for example, there is one shown in Fig. 1A, which includes a rear shaft 1 having a spline 1a and a high-speed transfer case arranged on the circumference of the rear shaft 1 to receive output from a transmission. The gear 2 and the low speed gear 3 (having splines 2a and 3a that engage with the spline 1a through the shift sleeve 4), the front shaft driving gear 5 that is spline engaged with the rear shaft 1, and the shift sleeve 6 A front shaft 7 having a spline 7a driven by a gear 5, a first shift rod 9 engaged with the shift sleeve 4 via a first shift fork 8, and a shift sleeve 4 via a second shift fork 10. second shift rod 1 engaged with 6;
1, a shift arm 12 that moves the second shift rod 11 in the axial direction when a shift lever (not shown) is operated, and a deflever 13 that moves the first shift rod 9 in the axial direction when the shift arm 12 is operated. , is fixed at a predetermined position and moves up and down to shift the first and second shift rods 9,
interlock 14 that prohibits movement of the rods 9 and 11 when engaged with the grooves 9a and 11a of the rods 9 and 11;
and a stopper 15 for restricting movement of the second shift rod 11 beyond a predetermined value.

In the above configuration, when the first and second shift rods 9, 11 are in the illustrated positions, the high speed rotation of the high speed gear 2 is caused by the shift sleeve 4 and the spline 2.
The signal is transmitted to the rear shaft 11 through the engagement of a and la, and high-speed two-wheel drive mode 2H is obtained. This state is illustrated as 2H in FIG. 1B. Next, when the shift lever is operated in the 4H direction, the second shift rod 11 moves to the left via the shift arm 12 and the deflever 13, and the interlock 14 falls into the groove 11a (on the other hand,
The first shift rod 9 does not move while the interlock 14 is engaged in the groove 9a). When the second shift rod 11 moves, the second shift fork 10 moves the shift sleeve 6 onto the spline 5.
a, 7a, the high-speed rotation of the rear shaft 1 is transmitted to the front shaft 7, and high-speed four-wheel drive mode 4H is realized.

Furthermore, when the shift fork is operated in the N direction, the first shift rod 9, which is disengaged between the interlock 14 and the groove 9a, is moved to the left.
The shift sleeve 4 moves to the left via the shift fork 8, and the engagement between the high-speed gear 2 and the spline 1a of the rear shaft 1 is released (while the second
(The shift rod 11 cannot be moved by the stopper 15.) A neutral mode N is thereby obtained. Finally, when the shift lever 1 is operated in the direction of 4L, only the first shift rod 9 moves to the left, so the low speed gear 3 and the rear shaft 1 are engaged via the splines 3a, 1a and the shift sleeve 4. A low-speed four-wheel drive mode 4L is obtained. In this way, each drive mode can be obtained by linear operation of the shift fork shown in FIG. 1B.

However, conventional transfer cases for four-wheel drive vehicles use two shift rods, one for high-low speed switching and one for four-wheel/two-wheel switching, so the relative movements of the shift rods cannot be interlocked. This had to be done using a deflever, which necessitated a complicated configuration.

This invention was made in view of the above,
To provide a transfer case for a four-wheel drive vehicle in which spring-biased four-wheel/two-wheel switching operation is limited by a single shift rod that controls a high/low speed switching mechanism in order to simplify the configuration. It is.

The transfer case for a four-wheel drive vehicle according to the present invention will be described in detail below.

FIG. 2 shows an embodiment of the present invention, and the same parts as in FIG. 16 to switch to the four-wheel drive mode, and is maintained in the two-wheel drive mode by the radially projecting end 9b, which is the engagement portion of the single shift rod 9. has been carried out, and also
When the control of the projecting end 9b is released, it engages with a stopper 15 that limits the amount of motion to a predetermined value or less.

In the above configuration, when the shift rod 9 is in the illustrated position, the high-speed rotation of the high-speed gear 2 is transmitted to the rear shaft 1 via the shift sleeve 4 and splines 2a, 1a, and high-speed two-wheel drive mode 2H is realized. Next, when the shift lever is operated in the 4H direction, the shift rod 9 moves to the left, so the shift fork 10 moves to the left by the spring 16, and the spline 5a of the rear shaft 1 moves to the left.
and the splines 7a of the front shaft 7 are engaged by the shift sleeve 6, and high-speed four-wheel drive mode 4H is obtained (the shift sleeve 4 moves by the amount of movement of the shift rod 9, but the splines 2a,
1a).
Furthermore, when the shift lever is operated in the N direction, the shift rod 9 moves to the left, but since the shift fork 10 is not moved by the stopper 15, the shift sleeve 6 maintains the four-wheel drive mode, while the shift rod 9 moves to the left. A neutral mode is obtained because the sleeve 4 moves a predetermined amount to disengage the splines 2a, 1a. Finally, shift the shift lever to 4L.
When the shift rod 9 moves, only the shift fork 8 moves to the left, so the spline 3a of the low-speed gear 3 and the spline 1a of the rear shaft 1 engage, resulting in low-speed four-wheel drive mode 4.
L is obtained. In the above description, the same operation can be obtained even if the rear shaft and front shaft are replaced.

As explained above, according to the transfer case for a four-wheel drive vehicle according to the present invention, the switching operation of the spring-biased four-wheel/two-wheel switching mechanism is performed by a single shift rod that controls the high-low speed switching mechanism. Since the number is limited, the configuration can be simplified.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional transfer case for a four-wheel drive vehicle. FIG. 1B is an explanatory diagram showing the operating direction of the shift fork. FIG. 2 is an explanatory diagram showing an embodiment of the present invention. Explanation of symbols: 1...Rear shaft, 2...High speed gear, 3...Low speed gear, 1a, 2a, 3a...
...Spline, 4...Shift sleeve, 5...Gear, 7a...Spline, 6...Shift sleeve, 7...Front shaft, 8, 10...Shift fork, 9, 11...Shift rod, 15...
...stopper, 16...spring.

Claims (1)

[Claims for Utility Model Registration] A single shift rod that is movable in the axial direction by operating a shift lever and has an engaging part; a switching shift sleeve, which is movably disposed on the shift rod and is always biased toward the four-wheel drive mode by an elastic member, and when in the two-wheel drive mode, the elastic member is moved by the engaging portion of the shift rod; a shift fork whose movement is restricted by the biasing of the shift fork; a shift sleeve for switching between four-wheel drive mode and two-wheel drive mode connected to the shift fork; and a shift sleeve that engages with the shift fork and restricts the engagement portion. A transfer case for a four-wheel drive vehicle, comprising: a stopper that limits the amount of movement of the shift fork when the shift fork is released.