JPS6213141Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed change operation structure for driving, in which a speed change operation lever is configured to swing and selectively engage a plurality of shift forks.

As this type of speed change operation structure for driving, the special public
Publication No. 41285 provides a pair of second pins with a cam surface that are slidable in the swinging direction for engaging and operating the shift operating lever with the shift fork, and the second pin is slidable between the two fork shafts. The tips of the two first pins are biased to come into contact with the respective cam surfaces of the pair of second pins by springs from a direction perpendicular to the sliding direction of the second pins, and the shift operation lever is always kept in the neutral side. The document discloses a device that attempts to restore the vehicle, and further states that by changing the spring characteristics or the slope of the cam surface, only the operating force for reversing can be strengthened and configured as a reverse rest lift mechanism, but this configuration In this case, the cam surface is urged into contact with the spring from a direction perpendicular to the sliding direction of the second pin, so after operating the shift operation lever in the selected direction against the urging force of the spring, Since the shift fork must be operated while applying an operating force to the gearshift operation lever that resists the biasing force of the shift fork, there is an inconvenience that it is difficult to operate the shift fork when a strong spring is used.

The technical problem that this invention aims to solve is that even with a simple modification, when the gear shift operating lever is engaged in the reverse direction, a large operating resistance is applied to the gear shifting operating lever only during the operation, and the engagement operation is completed. The point is to make it so that there is no resistance to operation when it is used.

The technical means taken to solve the above technical problem is to attach a shift fork to each of a plurality of shift fork shafts arranged substantially parallel to each other in a slidable manner, and to align the axis of the shift fork shaft. Each of the shift forks is selectively engaged with a speed change operation lever configured to be swingable in both directions along the axis and in a direction perpendicular to the axis as the speed change operation lever swings in the direction perpendicular to the axis. In a freely configured speed change operation structure for traveling, with respect to a swing operation path of the speed change operation lever in a direction orthogonal to the axis, the device enters into the operation path from a lateral direction intersecting the swing operation path. Then, a pressing member that provides elastic resistance to selective swinging of the speed change operation lever toward the reverse shift fork side of the shift fork is moved such that the resistance causes the speed change operation lever to shift from the neutral position to the reverse shift fork side. The shift fork is mounted on the reverse shift fork or a shift fork adjacent thereto, and is positioned so that it acts on the gear shift operation lever only during the swinging operation until the end of selecting the fork.

The above technical means works as follows.

When the gear shift operation lever is engaged from the neutral position to the reverse shift fork side, the fork operation of the gear shift lever is performed using a pressing member that can freely move in and out and biases the shift lever toward the side that protrudes from the lateral direction into the operating path of the fork operating section. Therefore, when performing the above-mentioned engagement operation, the operating lever begins to push both pressing members laterally against the biasing force at the starting point, and midway through, the maximum biasing force is applied at the maximum pushing position. After that, the operating resistance decreases and becomes zero at the end of the engagement operation.

Therefore, the present invention has the following effects.

When engaging the operating lever to the reverse shift fork side, the operating resistance applied to the operating lever from the start to the end of the operation occurs only during this period, and reaches its maximum in the middle. This large operational resistance allows the driver to easily recognize the reverse operation, making it easier to avoid the risk of the vehicle being reversed due to an erroneous operation, and allowing the driver to drive safely.

In addition, since the operating resistance occurs only during the operation to select the shift fork for reverse movement, and only for a period during the operation, when operating the shift fork after operating the operating lever in the selection direction, the pressure There is no need to operate the shift fork with an operating force applied to the operating lever that resists the urging force of the member, and the shift fork can be easily operated even if a pressing member with a strong urging force is used.

Furthermore, since the pressing member to be biased is mounted on the shift fork side, there is less misalignment due to manufacturing or assembly errors compared to when it is mounted on the transmission case side. It was possible to suppress the difficulty in assembling and manufacturing, and it was advantageous in terms of cost and manufacturing.

Hereinafter, embodiments of the present invention will be described based on the drawings.

A driving unit 2 and a driving cabin 3 are provided at the front part of the machine base, which has a pair of left and right wheels 1 on each of the front and rear sides,
A loading platform 4 is provided behind them to constitute a transport vehicle.

The drive system for the wheels 1 is equipped with a gear transmission capable of changing gears into a total of 5 gears, 4 forward gears and 1 reverse gear, and the traveling gear shift operation is performed by switching this transmission. . The operation structure for the mission is constructed as shown in FIGS. 2 and 3.

That is, three almost parallel shift fork shafts 6 are arranged in parallel in the case 5 for the transmission.
..., a first shift fork 7 for forward first and second speeds, a second shift fork 8 for forward third and fourth speeds, and a third reverse shift fork 9.
are individually slidably attached to the case 5, and a gear shift operation lever 10 is attached to the case 5 so as to be pivotable in a cross direction. Then, when the lever 10 is swung in the lateral direction of the vehicle body, the fork operating section 10a provided in the transmission case 5 selectively engages with the shift fork 7, 8, 9, and When the lever 10 in this state is swung in the longitudinal direction of the vehicle body, the shift forks 7, 8, and 9 slide to the transmission position and the neutral position.

A pair of ball members 11, 11, which are movable in and out, are press members that contact the operating portion 10a from the lateral direction on the operating path of the operating portion 10a that is engaged with the third shift fork 9 from the neutral position. A pair of coil springs 12, 12 that bias these ball members 11, 11 to protrude separately are attached to the first shift fork 7, and both springs 12, 12 are used to select the third shift fork 9. By adding elastic operation resistance to operation,
Consideration has been given so that the driver can easily recognize the reverse operation.

Note that the pair of ball members 11, 11 and the pair of coil springs 12, 12 may each be one piece, and the coil spring 12 acts directly on an elastic resin member, a plate spring, or the speed change operation lever 10. These members are collectively referred to as members 12 that elastically apply operational resistance.

Further, the resistance imparting member 12 may be attached to the third shift fork 9.

Further, the direction of swinging of the lever 10 for selecting or sliding the shift forks 7, 8, and 9 may be any direction, with the lateral direction of the vehicle being the first swinging direction and the longitudinal direction of the vehicle being the second swinging direction. Named respectively.

[Brief explanation of the drawing]

The drawings show an embodiment of the speed change operation structure for traveling according to the present invention, and FIG. 1 is a side view of a transport vehicle, FIG. 2 is a side view of the main part, and FIG. 3 is a plan view of the main part. 6...Shift fork shaft, 7, 8...Shift fork, 9...Shift fork for reverse, 10...
Gear shift operation lever, 11...pressing member, 12...spring.

Claims (1)

[Scope of utility model registration request] A shift fork 7, 8, 9 is slidably attached to each of a plurality of shift fork shafts 6 arranged in parallel with each other, and a direction along the axis of the shift fork shaft 6 and a direction perpendicular to the axis. The shift forks 7, 8, and 9 can be selectively engaged with the shift operating lever 10, which is configured to be swingable in both directions. In the driving speed change operation structure configured, the speed change operation lever 1
0, the shift fork 7,
A pressing member 11 that provides elastic resistance to the selective swinging of the shift operating lever 10 toward the reverse shift fork 9 side of the shift fork 9 for reverse movement, the resistance of which is from the neutral position of the shift operating lever 10 to the reverse shift fork 9 side. It is characterized in that it is attached to the reverse shift fork 9 or the shift fork 7 adjacent thereto, with the position set so that it acts on the shift operation lever 10 only during the swinging operation until the selection of the shift fork 9 is completed. Shift operation structure for driving.