JPS6140987Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a change device for a transmission used in a vehicle such as a four-wheel drive vehicle, and more specifically, the present invention relates to a change device for a transmission used in a vehicle such as a four-wheel drive vehicle. The present invention relates to a change device in a transmission with an additional gear.

As a conventional device of this kind, one is known in which each gear stage of the main and sub-transmissions is selectively established by the selection and shift operations of a common control rod provided in the transmission case. In this device, it is necessary to enable the control rod to perform a selection operation over the selection position of the sub-transmission outside the selection area of the main transmission, and since the range of selection operation is widened, the selection operation of the main transmission is This has the disadvantage that the operability is lower than that without a sub-transmission.

This invention focuses on the fact that the gears of the auxiliary transmission are used in special driving conditions and do not need to be used all the time, and allows the control rod to select the gears to the auxiliary transmission side. The purpose of this invention is to provide a device that can freely switch from a state to a state in which select operation is possible only within the select range of the main transmission, thereby improving select operability. It is a transmission which is formed by adding a transmission, and each gear stage provided in the main transmission and the sub-transmission is controlled by the selection operation and shift operation of one common control rod 2 provided in the transmission case 1. is selectively established, the case 1 is provided with a lock mechanism 3 that operates to prevent the select operation of the control rod 2 toward the auxiliary transmission, and the lock mechanism 3 is in an activated state. The control rod 2 is characterized in that it can be freely switched to an inoperative state in which a selection operation to the sub-transmission side is permitted.

The illustrated example shows an embodiment in which the present invention is applied to a vehicle transmission, which comprises a main transmission with five forward speeds and one reverse speed, and an auxiliary transmission with an ultra-low speed speed change. , a first shift rod ₄₁ for switching between five speeds and reverse as shown in FIG.
and a second shift rod ₄₂ for switching between 3rd and 4th speeds.
and a third shift rod ₄₃ for switching between 1st and 2nd speeds are arranged in parallel so as to be slidable in the longitudinal direction, and a fourth shift rod 43 for establishing an extremely low speed gear of the sub-transmission is provided at the rear of the case 1. The shift rods 4 ₄ are arranged so as to be slidable in the front and rear direction, and these shift rods 4 ₁ , 4 ₂ ,
Shift pieces 5 ₁ , 5 ₂ attached to 4 ₃ , 4 ₄ ,
5 ₃ and 5 ₄ are arranged side by side in the horizontal direction as shown in Figure 2,
The control rod 2 is supported by the case 1 so as to be slidable and rotatable in the lateral direction, and when a selection operation is performed by the sliding movement, the shift arm 6 on the rod 2 moves between the shift pieces 5 ₁ , 5 . _2,5
The shift pieces 5 ₁ , _{5 2 ,}
Shift rods 4 ₁ , 4 ₂ , corresponding to 5 ₃ , 5 ₄
4 ₃ and 4 ₄ are given sliding motion in the front-rear direction so that a predetermined gear stage can be appropriately established.

To explain this in more detail, according to the shift operation of the control rod 2 at the first select position A at the right _end in FIG _. and the first
When switching between 5th speed and reverse via the shift rod ₄₁ , and when shifting at the second select position B on the left side of the first select position, the shift arm 6 moves to the shift piece of the second shift rod _42. 5 ₂ and the switching between 3rd and 4th speeds via the second shift rod ₄₂ is further performed by a shift operation at the third select position C on the left side of the second select position, the shift arm 6 engages with the shift piece ₅₃ of the third shift rod ₄₃ so that switching between 1st speed and _2nd speed is performed via the third shift rod 43. When performing a shift operation by performing a select operation from the select area of the main transmission that spans three select positions to the fourth select position D on the left side, the shift arm 6 engages with the shift piece 54 of the _fourth shift rod ₄₄ . Then, the sub-transmission is switched to a very low speed gear stage via the fourth shift rod ₄₄ , and thus a shift operation is performed in the change pattern shown in the fourth figure.

The control rod 2 is provided with a first sliding control lever 8 and a second rotating control lever 9, which engage a connector 7 attached to the base thereof, to perform a select operation and a shift operation, respectively. , to the outer ends of the lever shafts 8a, 9a of each of the levers 8, 9, wires for select operation and shift operation extending from a change lever for the passenger compartment (not shown) were connected via wire locking pieces 8b, 9b. .

In the drawing, 10 is the operation prevention mechanism provided to prevent a direct shift operation from the 5th speed side to the reverse side at the first select position A, and 11 is the fourth shift rod _44.
2 shows a very low speed clutch that is interlocked via a shift fork 12.

According to the present invention, the transmission case 1 is provided with a lock mechanism 3 that operates to prevent the control rod 2 from selecting the sub-transmission side, that is, from selecting the fourth select position D. The lock mechanism 3 can be switched between an activated state and an inactive state that allows the control rod 2 to move to the fourth select position D. , the lock mechanism 3
A lock piece 13 that cooperates with the connector 7 attached to the control rod 2 is swingably provided between an operating position facing the end face of the connector 7 and an inoperable position on the side thereof. The lock piece 1
According to the rocking to the operating position of 3, the connector 7 comes into contact with the lock piece 13 when the control rod 2 is moved to the third select position C, and the connector 7 moves beyond the third select position C. The selection operation to the fourth selection position D is prevented.

The lock piece 13 is swung by a wire operation via a wire engagement piece 15 at the outer end of the operating shaft 14 which is engaged with the lock piece 13 to prevent rotation.
In a wheel drive vehicle equipped with a switching means for switching between four-wheel drive and two-wheel drive, the lock piece 13
is interlocked with the switching means to swing between an operating position during two-wheel drive and an inactive position during four-wheel drive. This is to prevent excessive torque from being applied to drive system components such as propeller shafts and differential gears, reducing their durability if a very low gear is established during two-wheel drive. It is.

In the drawings, reference numeral 16 indicates locking mechanisms 17 and 18 for preventing the lock piece 13 from moving loosely, indicating an input shaft and an output shaft of the transmission.

Next, to explain the operation of the device of the present invention, when the lock piece 13 is swung to the operating position and the lock mechanism 3 is switched to the operating state, the selection operation of the control rod 2 to the fourth select position D is blocked. The first part located in the main transmission select area
Only the select operation between the first to third select positions is possible, and the range of the select operation is the same as that of a normal transmission without an additional auxiliary transmission, improving select operability.

Next, in special driving conditions such as four-wheel drive, the control rod 2 is moved to the fourth select position D by swinging the lock piece 13 to the inoperative position and switching the lock mechanism 3 to the inactive state. It becomes possible to establish the gear stage of the auxiliary transmission through a selection operation, and the function of the auxiliary transmission can be exerted to perform desired driving.

As described above, according to the present invention, the lock mechanism 3 is provided to prevent the selection operation of the control rod 2 toward the auxiliary transmission, and the lock mechanism 3 can be freely switched between the operating state and the non-operating state. Lock mechanism 3
The vehicle can travel using the auxiliary transmission with the auxiliary transmission inactive, and during normal driving when the auxiliary transmission is not required, the lock mechanism 3 is activated and the select operation range of the control rod 2 is changed to the main transmission. This has the advantageous effect of being able to improve the selection operability by limiting the selection area to the selection area.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional side view of an example of the device of the present invention, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a cross-sectional view taken along the - line in Fig. 2 of the lock mechanism in an inoperative state. FIG. 4 is a diagram showing the change pattern. 1...Transmission case, 2...Control rod, 3...Lock mechanism.

Claims (1)

[Scope of utility model registration request] This is a transmission in which an auxiliary transmission is added to a main transmission, and the main transmission and the auxiliary transmission are controlled by a select operation and a shift operation of a single common control rod 2 provided in a transmission case 1. In a system in which each transmission is selectively established in preparation for
The case 1 is provided with a lock mechanism 3 that operates to prevent the select operation of the control rod 2 to the sub-transmission side, and the lock mechanism 3 is set in the operating state and the control rod 2 is moved to the sub-transmission side. A transmission changing device characterized in that it can be freely switched between an inoperative state and an inactive state that allows a selection operation.