JPH0538280Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a device for preventing shift lever vibration and shift slippage in industrial vehicles such as forklifts.

[Prior Art] Conventionally, in industrial vehicles such as forklifts, various vibration isolating means have been adopted in order to prevent vibration of a shift lever.

For example, the one shown in FIG. 6 incorporates a vibration absorption mechanism 4 into a shift link rod 3 that connects a shift lever 1 and a transmission 2, so that vibrations and displacement of the transmission 2 are not transmitted to the shift lever 1. I try not to. This vibration absorption mechanism 4 is constructed by connecting two link rods 5 and 6, which are constituent members of the shift link rod 3, to each other with play in the axial direction.
This play allows the movement of the transmission side link rod 6 to be absorbed.

[Problems to be solved by the invention] However, the machine base may vibrate greatly when driving over bumps or during damping work for vehicles equipped with damping forks. In this case, the vibration could not be absorbed, and the shift lever 1 would vibrate, and in some cases, there was a risk that the shift lever 1 would come out of the shift position. In addition, a vibration absorbing mechanism 4 as shown in FIG.
is provided in shift link rod 3,
There was a problem in that the shift position of the shift lever 1 became unclear due to the play.

The purpose of this invention is to solve these problems.

[Means for Solving the Problems] According to this invention, the shift lever vibration isolator includes a shift lever and a detent for holding it at each shift position, a member on the shift lever and the machine frame side, and a detent for holding the shift lever at each shift position.
For example, the shift link rod is provided between the transmission and the shift lever, and includes a first link rod having a cylindrical member at one end, and a connecting member accommodated in the cylindrical member. a second link rod having one end thereof and disposed coaxially with the first link rod, and the connecting member moves within the cylindrical member within a certain range in order to absorb displacement of the transmission. It is characterized in that the connecting member is accommodated within the cylindrical member with play so that it can freely move in the axial direction. The detent holds the shift lever in the shift position by fitting a pin or the shift lever itself into a member on the machine frame side or a groove in a grooved plate attached to the shift lever.

[Function] The shift lever vibration isolator of this invention having the above-mentioned structure absorbs and alleviates vibrations from the transmission through the play in the link mechanism, and the detent holds the shift lever in the shift position and maintains it. The force is used to reduce vibrations and prevent shifts from being missed.

[Embodiments] Hereinafter, preferred embodiments of the shift lever vibration isolating device according to this invention will be described in detail with reference to the drawings.

Note that the same reference numerals will be used to describe parts that are the same as or corresponding to the conventional configuration.

As shown in FIG. 1, the shift lever 1 is
It is connected to the transmission 2 by a shift link rod 3. Further, the shift link rod 3 has a built-in vibration absorbing mechanism 4 similar to the conventional one. That is, this shift link rod 3 consists of two link rods 5 and 6, and a cylindrical member 7 is provided at the end of one link rod 5, and within this cylindrical member 7, the other link rod is inserted. A connecting member 8 provided at the end of the connecting member 6 is accommodated with play in the axial direction.

As clearly shown in FIG. 2, the shift lever 1 extends through a hole 11 formed in a toeboard 10 of the driver's seat, and a boss 12 at the lower end is fitted into a shaft 14 of a shaft assembly 13. The shaft assembly 13 is fixed to the machine frame 16 with bolts 15. A compression spring 1 is installed between the base of the shaft 14 and the boss 12 of the shift lever 1.
7 is arranged to press the boss 12 toward the free end of the shaft 14. Also, the boss 12 is the shaft 1
A nut 18 is attached to the free end of the shaft 14 to prevent it from falling off the shaft 14.

Between the shift lever 1 and the toe board 10,
A detent is provided to hold the shift lever 1 in the shift position. The detent in the illustrated embodiment consists of a grooved plate 20 fixed to the toe board 10, a shift lever 1, and a compression spring 17 attached to the shaft 14.
7, the shaft portion of the shift lever 1 is fitted into one of the grooves 21 of the grooved plate 20 and held. Each groove 21 of the grooved plate 20 is formed to correspond to each shift position of the shift lever 1. In addition, when the shift lever 1 fits into each groove 21, in any case, the shift link rod 3
The vibration absorbing mechanism 4 is in a neutral state. That is, the shift link rod 3 is attached so that the connecting member 8 has equal play in the longitudinal direction with respect to the cylindrical member 7 at the shift position.

In such a configuration, the operation of the shift lever vibration isolating device according to this invention will be described next.

If the transmission 2 is a floating type, the transmission 2 moves back and forth, left and right, and up and down due to engine vibration and machine vibration, and the transmission side link rod of the shift link rod 3 moves accordingly. 6 moves, but
When this amount of movement is less than a certain amount, the movement is absorbed by the play between the connecting member and the cylindrical member, and the shift lever 1 does not vibrate. In addition, when extremely large vibrations occur when driving over a bump, etc., the vibrations are not absorbed by the vibration absorption mechanism 4 in the shift link rod 3 and are transmitted to the shift lever 1, but when the shift lever 1 Since it fits into one of the grooves 21 and is pressed down by the compression spring 17, the vibration is reduced and the shift lever 1 does not come out of the shift position. Also,
Vibrations are also directly transmitted from the machine frame 16 to the shift lever 1, but in this case as well, the detent prevents vibrations and missing shifts. Additionally, those skilled in the art will appreciate that the compression spring 17 also reduces vibrations.

On the other hand, when performing a shift operation, when the driver grasps the knob 19 and applies force to the shift lever 1 forward or backward, the shift lever 1 resists the pressing force of the compression spring 17 and moves toward the grooved plate 20. It comes off from the groove 21 and moves to another groove 21. At this time, the driver is informed by touch that the shift lever 1 has passed over the peak between the grooves 21, so that the driver can clearly know the shift position. In the desired shift position, the shift lever 1 is held in the corresponding groove 21 by the action of the compression spring 17.

In the first embodiment described above, the grooved plate 20
is fixed to the toe board 10, but the fixing location may be any member on the machine frame 16 side, and by changing the shape of the grooved plate 20, it can be directly fixed to the machine frame 16. In addition, the structure of the detent and the vibration absorption mechanism can be modified as appropriate, and FIGS. 3 to 5 of the drawings show a second embodiment of this invention.

3 to 5, a grooved plate 30 is fixed to the outer peripheral surface of the boss 12 of the shift lever 1. As shown in FIGS. Further, a support plate 32 is non-rotatably attached to the shaft 14 of the shaft assembly 13, and a pin 34 on a lever 33 that is pivotally supported by this support plate 32 can be fitted into a groove 31 of the grooved plate 30. It is located in The pin 34 is always fitted into the groove 31 by a tension spring 35 provided between the support plate 32 and the lever 33, and due to the detent of this structure, the shift lever 1 is not shifted. It is held in position to prevent vibration and missed shifts, as in the first embodiment.

Further, a bifurcated member 36 is integrally provided on the lower side of the outer peripheral surface of the boss 12 of the shift lever 1.
Shaft 1 between boss 12 and support plate 32
An intermediate link plate 37 is rotatably fitted into the intermediate link plate 4, and a pin 38 provided on the intermediate link plate 37 is arranged with play between the bifurcated members 36. Furthermore, one end of the shift link rod 3 is connected to the tip of the intermediate link plate 37, and the other end is connected to a transmission (not shown). In such a configuration, movement of the shift link rod 3 due to vibration and displacement of the transmission is caused by the pin 38 and the bifurcated member 3.
It is absorbed by the play between 6 and 6.

[Effects of the invention] As described above, according to this invention, vibrations from the transmission are absorbed and alleviated by the vibration absorption mechanism provided in the link mechanism between the transmission and the shift lever. At the same time, the shift lever is held down by the detent between the shift lever and the member on the machine frame side.
The vibration of the shift lever can be significantly reduced, and there is no fear that the shift lever will come out of the shift position even when driving over bumps or performing damping work. Additionally, the detent allows the driver to clearly confirm the shift position of the shift lever, improving shift feeling and reducing erroneous operations.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing a first embodiment of a shift lever vibration isolator according to this invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. FIG. 4 is an exploded perspective view showing a second embodiment of this invention; FIG. 4 is a sectional view of the assembled shift lever vibration isolator taken along line B-B in FIG. 3; FIG. C-
FIG. 6 is a side view of the assembled shift lever vibration isolator taken along line C, and is a schematic explanatory diagram of a conventional shift lever vibration isolator. In the figure, 1...Shift lever, 2...Transmission, 3...Shift link rod, 4...Vibration absorption mechanism, 10...Toe board, 12...Boss, 14
...Shaft, 16...Machine frame, 17...
Compression spring, 20, 30...grooved plate, 32
... Support plate, 34 ... Pin, 35 ... Tension spring, 36 ... Bifurcated member, 37 ... Intermediate link plate, 38 ... Pin.

Claims (1)

[Claims for Utility Model Registration] (1) In an industrial vehicle in which a shift lever and a transmission are connected by a shift link rod, a detent for holding the shift lever at each shift position is provided in the machine frame. The first link rod is provided between the side member and the shift lever, and the shift link rod has a first link rod having a cylindrical member at one end, and a connecting member accommodated in the cylindrical member at one end. a second link rod disposed coaxially with the first link rod;
and a link rod, and the connecting member is inserted into the cylindrical member so that the connecting member can move freely in the axial direction within a certain range within the cylindrical member in order to absorb displacement of the transmission. Shift lever vibration isolator accommodated with play. (2) The detent consists of a grooved plate attached to a member on the machine frame side and formed with grooves corresponding to each shift position, and a shift lever arranged so as to be able to fit into the groove of the grooved plate. and a spring member that presses the shift lever so as to fit into the groove. The shift lever vibration isolating device according to claim 1, which is a registered utility model. (3) The detent consists of a grooved plate that is attached to the outer peripheral surface of the boss of the shift lever and has grooves corresponding to each shift position, and a grooved plate that is attached to the machine frame so that it can be fitted into the groove of the grooved plate. The shift lever vibration isolator according to claim 1, which is a registered utility model and comprises a pin provided on a member and a spring member that presses the pin to fit into the groove.