JPS6238401Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for attaching a front axle to a frame in a forklift truck in which a lift cylinder is disposed behind the mast.

Figure 1 is a side view of a forklift truck 1, in which 2 is a side rail of the frame, 5 is a mast that stands in pairs on the front left and right sides of the vehicle body, 7 is a fork, 11 is a front wheel, 12 is a fender, 13 indicates the driver's seat.

In conventional forklift trucks,
The forward view from the driver's seat 13 is insufficient because it is obstructed by the mechanism of a lift cylinder (not shown) located between the masts 5 erected on the left and right sides of the front of the vehicle. There was a safety issue.

As a way to solve this problem, we installed a lift cylinder located between the left and right masts at the rear of the mast to improve visibility across the mast frame. Although a type of forklift truck has been proposed,
The forklift trucks with improved visibility that have been proposed so far have the following drawbacks: That is, the conventional coupling mechanism between the front axle and the frame as shown in FIGS. 2 and 3, specifically, the mounting seats 010 provided above both ends of the front axle housing 09 and the front ends of both side rails of the frame. In the conventional mechanism in which the mounting plate 04 provided on the side bracket 03 fixed to each part is connected in a vertical relationship, the lift cylinder cannot be installed behind the mast because it is obstructed by the side bracket 03, and the mast and the lift cylinder cannot be installed behind the mast. It was necessary to place the cylinder further forward. This leads to a worsening of the ratio (usually 1.3 to 1.5) of the unstable moment of forward leaning of the truck due to the weight of the load on the forks 7 generated around the front wheels 11 to the stable moment due to the truck's own weight. There is a drawback that it is necessary to take measures such as increasing the weight of the balance weight provided at the rear of the truck or reducing the load capacity of the fork 7. Note that 08 is the front axle.

The present invention was made to eliminate the above-mentioned drawbacks, by changing the connection method between the side brackets attached to the frame side rails and the front axle housing from a top-to-bottom connection to a front-to-back connection, with the side brackets positioned lower, thereby creating space above the front axle required for installing the lift cylinder behind the mast.

The present invention is illustrated in the drawings (Fig. 4, Fig. 5, Fig. 6) below.
This will be explained based on an example shown in FIG.

Fig. 4 is a plan view of the main parts of the left side structure of the frame system, where the diagonally lined part (indicated by broken line) is the front end of the side rail 2, 3 is the side bracket fixed to the side rail, and 4 is the side bracket. 3 a mounting plate provided at the tip and having a surface parallel to and perpendicular to the axis of a front axle to be described later; 12 a fender;

Fig. 5 is a side view of the main part, and Fig. 6 is a rear view of the main part indicated by the arrow - in Fig. 5, where 5 is a mast;
The mast consists of an outer mast and an inner mast that slides up and down on the inner surface of the outer mast. 6 is a lift cylinder, 8 is a front axle, 9 is a front axle housing, and 10 is a mounting seat integrally formed at both ends of the housing and facing rearward, corresponding to the vertical plane of the mounting plate 4 and parallel to the axle axis. 11 indicates a front wheel, and 12 indicates a fender. The mounting plate 4 and the mounting seat 10 are coupled and fixed together by bolts in the longitudinal direction. Note that front wheels 11 are attached to both ends of the front axle 8, and an outer mast is attached to the front thereof. In addition, the arrangement of the mast 5 and lift cylinder 6 is of the above-mentioned visibility improved type,
The drawings show the relative positions of the front wheels 11, front axle 8, etc.

Among these, the relative position between the lift cylinder 6 and the side bracket 3 is the most important.If the conventional side bracket 03 were used, the lift cylinder 6 and, by extension, the mast 5 related mechanisms would not be located in the position shown in the figure. Although this is possible, since the axle and the frame are connected vertically at the rear of both ends of the front axle housing according to the present invention, the side bracket 3 does not protrude above the axle, and the frame is connected to the frame as shown in the figure. This allows for the installation of mast and lift cylinder related mechanisms. That is, a space required for disposing the lift cylinder behind the mast is formed above the front axle.

With the above configuration, the fork-related mechanism of the above-mentioned visibility-improving type does not need to be relocated to the front despite the rear arrangement of the lift cylinder, and therefore the fork-related mechanism of the above-mentioned visibility-improving type does not need to be moved to the front. This makes it possible to provide a forklift truck that does not require measures such as increasing the load or reducing or limiting the carrying load.

[Brief explanation of the drawing]

Figure 1 is a side view schematically showing a forklift truck, Figure 2 is a side view of the main part of a conventional forklift truck, Figure 3 is a plan view of Figure 2, Figures 4, 5 and 6.
The drawings show one embodiment of the present invention. Fig. 4 is a plan view of the main part of the left side structure of the frame system, Fig. 5 is a side view of the main part, and Fig. 6 is shown in the direction of the arrow - in Fig. 5. FIG. 3 is a rear view of main parts of the front axle. 1: Forklift truck, 2: Side rail, 3: Side bracket, 4: Mounting plate, 5: Mast, 6: Lift cylinder, 8: Front axle, 9: Front axle housing, 10: Mounting seat.

Claims (1)

[Scope of utility model registration request] In a forklift truck in which lift cylinders are installed behind the left and right masts, mounting seats are provided at the rear of both ends of the front axle housing, each with a surface parallel to and perpendicular to the axle axis. A side bracket fixed to the front end of the side rail and extending forward is provided with a mounting plate having a surface parallel to and perpendicular to the axle axis corresponding to the mounting seat, and the mounting seat and the mounting plate are connected to both corresponding vertical surfaces. A front axle and a frame in a forklift truck, characterized in that the front axle and the frame are connected and fixed to each other via a installation structure.