JPH06247339A - Protective device for motor of industrial vehicle - Google Patents

Abstract

PURPOSE:To provide a protective device which is used for the motor of an industrial vehicle and which is mounted with a cover by a simple bolting operation without machining frame-side members. CONSTITUTION:In an industrial vehicle, transmission cases 19 connected to each drive wheel are opposed to each other within frame internal space in front of the ends of a pair of right and left separate lower frames 12 constituting a frame 11 and a traveling motor 17 is disposed between the transmission cases 19. A cross plate 27 is suspended between the end portions of the pair of lower frames 12 and one end portion 23 of a cover 21 is engaged between the cross plate 27 and each of the pair of lower frames 12 and is extended to almost cover open space below the transmission cases 19, and the other end portion 25 of the cover 21 is locked to an existing member 29 of each transmission case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor protection device for an industrial vehicle such as an electric forklift truck, which is more reliable in waterproofing a traveling motor attached to a lower part of a machine base.

[0002]

2. Description of the Related Art A traveling motor (hereinafter, simply referred to as a motor) in an electric forklift truck is attached to a machine base integrally with a mission case and is arranged in a space inside the machine base. Therefore, a cover for rainwater splashing from the ground surface is attached. May be The cover may be attached at the shipping stage or may be attached by the user after sale.

FIG. 5 and FIG. 6 show a conventional cover mounting structure which is an example of an electric forklift with two front wheels simultaneously driven. In the electric forklift truck adopting the above-mentioned drive system, the motors are arranged vertically between the two transmission cases connecting the left and right drive wheels, and the cover 1 is provided for the lower motor 2. In this case, the lower motor 2 is located on the end edges of the pair of left and right lower frames 3 and 3, and the cover 1
Is attached by utilizing an under plate 4 which is erected by welding between the edge portions of the pair of lower frames 3 and 3.

That is, a mounting portion 5 is formed at the end of the under plate 4 where the lower end of the outer peripheral surface of the lower motor 2 approaches, and the base portion 1a of the cover 1 is superposed on the mounting portion 5. The cover 1 is attached by bolts 6. The main body portion 1b extending from the base end portion 1a of the cover 1 has a lower motor 2
It has a free end bent in a polygonal line following the outer peripheral surface of the. In such a mounting structure, the bolt 6 is inserted into the through hole 5a formed in the mounting portion 5, and the bolt 6 is screwed into the screw hole 7 of the base end portion 1a, so that the base end portion 1 of the cover 1 is covered.
This is a so-called cantilever support structure in which a is fastened to the mounting portion 5.

Therefore, the under plate 4 is shipped by mounting it on the pair of lower frames 3 and 3 so that the under plate 4 can be mounted after sale. However, as the under plate 4 to which the cover 1 is not attached from the time of shipment, an under plate having a portion where the attachment portion 5 is formed or an opening having no through hole 5a is used. The reason for this is that if the through hole 5a is formed in the member of the machine stand, the paint will not pass through the through hole 5a.
This is because rust may be induced without being sufficiently applied to the center of.

Therefore, when the user mounts the cover 1 after sale, the member corresponding to the mounting portion 5 is welded to the vacant space or the through hole 5a is drilled and then the cover 1 is mounted. You will be tightening the bolts. Such a cover 1 serves as a barrier for air holes formed on the outer peripheral surface of the motor against rainwater entering from the lower open space between the two mission cases.

[0007]

By the way, recently, in an electric forklift truck, a traveling mechanism mainly composed of a traveling motor and a transmission case is arranged more centrally in a lower portion of a machine base, and a lower motor 2 is provided. It is located closer to the lower frame 3 and is located, for example, a dozen centimeters from the ground. When the lower motor 2 is arranged near the ground as described above, consideration is given to rainwater, and the number of cover mounting cases after sale is increasing.

However, since the product which is not the conventional cover mounting specification is shipped without providing the through hole 5a in the under plate 3 as described above, the user is informed.
There is the trouble of welding a member corresponding to the mounting portion 5 in which the through hole 5a is formed or forming the through hole 5a in the portion corresponding to the mounting portion 5, and only a simple locking work such as bolt tightening is required. There has been a demand for a structure that can be installed at.

An object of the present invention is to provide a motor protection device for an industrial vehicle, which can be attached to a member on the machine base side by a simple locking operation without any processing.

[0010]

According to the present invention, both mission cases connected to each drive wheel face each other in the machine base space in front of the end edges of a pair of left and right lower frames that form the machine base, and In an industrial vehicle in which a traveling motor is arranged between a mission case, a cross plate erected on the end edges of a pair of lower frames, and one end engaged between the cross plate and the pair of lower frames, A cover is provided which extends below the motor so as to substantially cover the lower open space of the mission case, and the other end of which is locked to an existing member of the mission case.

[0011]

With this structure, one end of the cover is
It is supported by simply engaging between the pair of lower frames and the cross plate. Further, the other end can be locked by an existing member in both mission cases, for example, a brace rod connecting the ends of both mission cases by bolting. Therefore, the cover can be attached to the machine side member without performing any processing on the machine side member.

Further, the cover serves as a floor body that shields the lower open spaces of both mission cases, and serves as a more reliable rainwater barrier.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A motor protection device for an industrial vehicle according to the present invention will be described in detail below with reference to an embodiment applied to a two-wheel simultaneous drive vehicle. As shown in FIG. 1, a machine frame 11 of an industrial vehicle to which the present motor protection device is applied includes a pair of left and right lower frames 12 on which a battery (not shown) is mounted, from the front edges of the lower frames 12 to both tire frames. 13 are erected, and in the machine space inside the both tire frames 13, vertical frames 14 facing left and right are continuously provided. The vertical frames 14 are connected to the edge portions of the lower frames 12 and the side frames 1 integrated with the lower frames 12 are formed.
5 are connected to a cross frame 16 that connects them.

A space 12a is formed at the inner corner of the edge of the pair of lower frames 12 so as to avoid interference with the lower ends of both mission cases 19 described later.
As shown in FIG. 2, the lower motor 17 and the upper motor 18 arranged above and below are supported by the vertical frame 14 via the respective transmission cases 19 so that power is transmitted to the wheels 20 to which the drive wheels are attached. Has become.

As shown in FIG. 3, the cover 21 in this embodiment has a flat portion 23 having a plurality of screw holes 22 and forming one end portion of the present invention, and a lower motor 17 from the flat portion 23.
A plate-shaped main body portion 24 extending downward and a fastening portion 25 forming the other end portion of the present invention. Flat part 23
A long auxiliary metal fitting 26 is fastened to the lower surface of the with a bolt 22a screwed into the screw hole 22. Both ends of the auxiliary metal fitting 26 are in contact with the lower surfaces of the pair of lower frames 12 in which the spaces 12a are formed. A portion of the flat portion 23, which is fastened to the auxiliary metal fitting 26, further extends rearward, and is in contact with an upper surface of a cross plate 27 which is erected by welding on the lower surface side of the pair of lower frames 12.

On the other hand, two upper arcuate brackets 28 are fixed to the fastening portion 25 with a space therebetween, and these upper arcuate brackets 28 are attached to both mission cases 1.
It is locked from above by a bracing rod 29 for reinforcement, which is an existing member that connects the nine. Further, a plurality of through holes 30 are formed substantially in the middle of the upper arcuate bracket 28, and a separate lower arcuate bracket 31 is attached to the brace rod 29 by a bolt 30 a inserted into the through hole 30 from above. Is locked from below.

Further, the body portion 23 has an upper motor 18
The protrusion 23 a extends in the space 12 a corresponding to the mission case 19. This is the upper motor 18
Since the mission case 19 corresponding to is located above the mission case 19 of the lower motor 17 on the rear end side, rainwater does not enter from the space 12a.

Therefore, in the motor protection device having such a structure, the auxiliary metal fitting 26 is fastened to the flat portion 23 by the bolts 22a so that both ends of the auxiliary metal fitting 26 are located on the lower surface side of the pair of lower frames 12. Abut, auxiliary metal fitting 2
The flat portion 23 at the rear of 6 contacts the upper surface of the cross plate 27, and the flat portion 23 is engaged between the cross plate 27 and the pair of lower frames 12 without vertical rattling.

On the other hand, the fastening portion 25 is locked to the brace rod 29 in such a manner that the brace rod 29 is inserted between the upper arc bracket 28 and the lower arc bracket 31. As a result, the cover 21 is fixed to the member on the machine base side at both front and rear ends, and a mounting structure only by bolting is achieved. Therefore, according to such a cover mounting structure, when mounting after sale, first, the flat portion 23 of the cover 21 is placed on the upper surface of the cross plate 27, and the upper arc-shaped bracket 28 of the fastening portion 25 is attached to the brace rod. Hook above 29. After that, the auxiliary metal fitting 26 is applied to the flat portion 23 and screwed with the bolt 22a.
Tighten the screws to complete the cover installation.

As described above, the cover 21 of this embodiment can be attached to the member on the machine base side by a simple operation such as bolting without performing any processing on the member on the machine base side.
Further, the main cover 21 has a size that substantially covers the lower open space of both mission cases 19, and can almost shut off rainwater that enters from the space. Further, such a cover 21 can also prevent dust during traveling, thus fulfilling the function of keeping the traveling mechanism clean.

In the above embodiment, the auxiliary metal fitting 26 is bolted to the flat portion 23 when the cover is attached, but the auxiliary metal fitting 26 may be integrally attached to the flat portion 23 by welding. Further, as another embodiment, as shown in FIG. 4, brackets 34 having bolt insertion holes 34a may be arranged in parallel at both ends of the fastening portion 25. In this case, the bolt 33 for joining the inner case 19a and the outer case 19b of the mission case 19 when the cover is attached
And the bolt 33 into the insertion hole 3 of the bracket 34.
4a, and tighten the inner case 19a and the outer case 19
It suffices to rejoin b.

[0022]

As described above, the cover according to the present invention has one end engaged between the pair of lower frames and the cross plate and the other end locked to the existing member of the mission case. Even in the later installation, simple work such as bolt tightening can be done without any processing on the machine side member, which greatly reduces the labor required to increase the frequency of cover installation requests after sales. effective.

Also, it functions as a floor that shields the lower open space of both mission cases, and achieves a more reliable rainwater waterproofing effect.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a motor device device for an industrial vehicle to which the present invention is applied.

FIG. 2 is an explanatory diagram for explaining a positional relationship between an upper motor and a lower motor in the above embodiment.

FIG. 3 is a perspective view showing how the cover used in the above embodiment is attached.

FIG. 4 is a perspective view showing how a cover is attached according to another embodiment.

FIG. 5 is a plan view showing a conventional cover mounting structure.

FIG. 6 is a side view of the cover mounting structure.

[Explanation of symbols]

11 ... Machine stand, 12 ... Lower frame, 17 ... Lower motor,
19 ... Mission case, 21 ... Cover, 22 ... Screw hole, 23 ... Flat part, 22a ... Bolt, 24 ... Main body part,
25 ... Fastening part, 26 ... Auxiliary metal fitting, 27 ... Cross plate.

Claims (1)

[Claims] 1. A transmission case connected to each drive wheel faces a space inside the machine frame in front of an end edge of a pair of left and right lower frames forming a machine frame, and travels between the two mission cases. In an industrial vehicle in which a motor is arranged, a cross plate erected on the edge portions of the pair of lower frames, and one end of the cross plate is engaged between the cross plate and the pair of lower frames. A motor protection device for an industrial vehicle, comprising a cover that extends below the motor so as to substantially cover the open space and has the other end locked to an existing member of the mission case.