Industrial vehicle

Abstract

To provide an industrial vehicle which is capable of shortening time required to selection of a wiring harness when mounting optional auxiliary equipment to the industrial vehicle.SOLUTION: A vehicle body side wiring harness 37 comprises a vehicle body side harness main body part 37A which includes a plurality of electrical wirings and a vehicle body side connector 37B which is provided on an end part of the electrical wirings. Each intermediate wiring harness is selected from plural kinds of wiring harness groups specified in advance. The plural kinds of wiring harness groups contain a condition specification wiring harness 45 which specifies operation conditions of auxiliary equipment, an auxiliary equipment connection wiring harness 52 which is capable of connecting with the auxiliary equipment and an extension wiring harness 51 which is capable of connecting with the condition specification wiring harness 45 or the auxiliary equipment connection wiring harness.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an industrial vehicle. [Background technology]

[0002] A known example of conventional industrial vehicle technology is the industrial vehicle disclosed in Patent Document 1. Patent Document 1 discloses a forklift equipped with a blue light on the head guard. The blue light is attached so that its optical axis faces diagonally downward and rearward, at a predetermined distance behind the machine base, and when turned on, it can illuminate the floor behind the machine base with a spot of colored light. The blue light emitted by the blue light when the blue light is turned on can alert workers working behind the forklift to the presence of the forklift.

[0003] The blue light provided on this type of forklift is a type of accessory. However, it is not limited to accessories that are factory-installed on forklifts. It can also be an optional accessory installed at the request of the forklift user. Optional accessories can be prepared and installed by the forklift manufacturer. Alternatively, optional accessories can be prepared by the user or a forklift dealer and installed at the dealer. In this case, the accessory is installed at the dealer, and multiple wire harnesses compatible with the accessory are connected to the wire harness extending from the vehicle body. When installing optional accessories on a forklift, the forklift manufacturer may design a corresponding wire harness for each accessory according to the user's request. The operating conditions of optional accessories are set to meet the user's requirements. For example, a wire harness compatible with the accessory's control must be prepared, such as linking a drive recorder with the key switch or activating a blue light when reversing. The installation location of accessories also varies depending on the user. In addition, some auxiliary equipment may be equipped with switches that not only control the equipment but also allow it to be operated at the operator's discretion.

[0004] To satisfy these user demands, optional accessories and wiring harnesses may be modified to accommodate these accessories. However, some dealerships may find it difficult to make partial modifications to wiring harnesses, such as branching the wiring harness, and in such cases, the manufacturer may need to carry out the design. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-99079 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the past, it was difficult to find wire harnesses compatible with optional accessories from a vast amount of past performance data because it required a great deal of time and effort. Therefore, it took time to design and manufacture wire harnesses compatible with optional accessories from scratch or based on past performance data, which resulted in a problem of delaying delivery to industrial vehicle users. When optional accessories are installed on industrial vehicles, it is necessary to meet the user's request to check the operating status of the accessories on an industrial vehicle actually equipped with the accessories and determine their operating conditions.

[0007] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide an industrial vehicle that can reduce the time required to select a wire harness when installing optional accessories in the industrial vehicle. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides an industrial vehicle having a vehicle body, an auxiliary device mounted on the vehicle body, a vehicle body side wire harness provided on the vehicle body and used to connect to the auxiliary device, and an intermediate wire harness connected to the vehicle body side wire harness and the auxiliary device, wherein the vehicle body side wire harness comprises a vehicle body side harness main body portion having a plurality of electrical wirings and a vehicle body side connector provided at an end of the plurality of electrical wirings, and the intermediate wire harness is at least one selected from a group of multiple types of wire harnesses specified in advance, and the group of multiple types of wire harnesses includes a condition-specific wire harness that specifies the operating conditions of the auxiliary device, an auxiliary device connecting wire harness that can be connected to the auxiliary device, and an extension wire harness that can be connected to the condition-specific wire harness or the auxiliary device connecting wire harness.

[0009] In the present invention, the vehicle body-side wire harness includes a vehicle body-side harness main body having a plurality of electrical wirings and a vehicle body-side connector provided at the end of the electrical wirings. The intermediate wire harness is connected to the vehicle body-side wire harness and the auxiliary equipment, and is selected from at least one of a pre-specified group of wire harnesses. The group of wire harnesses includes a condition-specific wire harness connectable to the vehicle body-side connector and specifying the operating conditions of the auxiliary equipment, an extension wire harness connectable to the condition-specific wire harness, and an auxiliary-connecting wire harness connectable to the extension wire harness and the auxiliary equipment. Because the intermediate wire harness is selected from at least one of the pre-specified group of wire harnesses, even if an optional auxiliary equipment is installed, the time required to design any of the selected condition-specific wire harness, extension wire harness, and auxiliary-connecting wire harness is reduced. As a result, the time required to select a wire harness can be reduced, thereby shortening the time until the industrial vehicle is delivered to the user.

[0010] In addition, in the above-mentioned industrial vehicle, the number of poles of the vehicle body side connector may be four, and the condition-specific wire harness may include a condition-specific harness main body having the plurality of electrical wirings, a condition-specific connector provided at one end of the condition-specific harness main body and connectable to the vehicle body side connector, and a plurality of two-pole condition-specific connectors provided at the other end of the condition-specific harness main body and connectable to the extension wire harness. In this case, the type of vehicle body side wire harness can be unified by setting the number of poles of the vehicle body side connector to four. Also, the condition-specifying wire harness can have multiple two-pole condition-specifying connectors that can be connected to the extension wire harness, and the operating conditions of the auxiliary equipment can be selected from multiple options.

[0011] In addition, in the above-mentioned industrial vehicle, the operating conditions of the auxiliary equipment may be key interlocking by turning on a key switch provided on the vehicle body, forward interlocking which is interlocked with forward traveling only, reverse interlocking which is interlocked with reverse traveling only, and forward / reverse interlocking which is interlocked with the forward traveling and the reverse traveling, and at least one operating condition may be specified by selecting the condition-specifying wire harness. In this case, the operating conditions for the accessories are key interlocking when the key switch on the vehicle is turned on, forward interlocking which is interlocking only with forward driving, reverse interlocking which is interlocking only with reverse driving, and forward / reverse interlocking which is interlocking with forward driving and reverse driving, which covers most of the operating conditions required for the accessories. Therefore, it is possible to reduce the amount of wire harnesses that need to be designed from the beginning to specify the operating conditions for the accessories.

[0012] In addition, in the above-mentioned industrial vehicle, a 4-pole branched wire harness that branches into multiple wire harnesses at 4 poles may be interposed between the vehicle body side wire harness and the condition-specific wire harness, and the 4-pole branched wire harness may be selected from the group of multiple types of wire harnesses. In this case, a 4-pole branched wire harness selected from a group of multiple types of wire harnesses is interposed between the vehicle body wire harness and the condition-specific wire harness. The use of the 4-pole branched wire harness not only allows the number of accessories to be increased, but also eliminates the need to modify the vehicle body wire harness or design a wire harness that specifies operating conditions in order to increase the number of accessories.

[0013] In addition, in the above-mentioned industrial vehicle, the operating condition of the auxiliary equipment may be specified as at least one operating condition from the key interlocking, the forward interlocking, the reverse interlocking, and the forward / reverse interlocking, and may be a switch interruption by turning an operation switch ON / OFF, and a switch interruption wire harness that specifies the operating condition of the switch interruption may be interposed between the extension wire harness and the auxiliary equipment connection wire harness. In this case, a switch interruption wire harness that specifies the switch interruption operation condition is interposed between the extension wire harness and the accessory connection wire harness. Therefore, even if the accessory operation condition is specified as at least one of key interlocking, forward interlocking, reverse interlocking, and forward / reverse interlocking, it is possible to control the operation of the accessory by turning the operation switch on or off.

[0014] In the above-described industrial vehicle, the plurality of condition specifying connectors may include a key interlocking connector that specifies the key interlocking, and a reverse interlocking connector that specifies the reverse interlocking. In this case, the multiple condition-specific connectors include a key-linked connector that specifies key-linked operation and a reverse-linked connector that specifies reverse-linked operation, thereby enabling the combination of key-linked accessories and reverse-linked accessories to be realized.

[0015] In addition, in the above-mentioned industrial vehicle, the multiple condition-specific connectors may be configured to include a key interlocking connector that identifies the key interlocking, a forward interlocking connector that identifies the forward interlocking, a reverse interlocking connector that identifies the reverse interlocking, and a forward / reverse interlocking connector that identifies the forward / reverse interlocking. In this case, the multiple condition-specific connectors include a key-linked connector, a forward-linked connector, a reverse-linked connector, and a forward-reverse-linked connector. Therefore, even if a connector with a specific operating condition is connected, the operating condition of the accessory can be changed by changing the connected connector.

[0016] Furthermore, in the above-described industrial vehicle, the group of multiple types of pre-specified wire harnesses may include the 4-pole branch wire harness, a 2-pole branch wire harness that branches into multiple parts at two poles, multiple extension wire harnesses of different lengths, the condition-specifying wire harness that specifies the key interlocking, the condition-specifying wire harness that specifies the forward interlocking, the condition-specifying wire harness that specifies the reverse interlocking, the condition-specifying wire harness that specifies the forward / reverse interlocking, the switch interrupt wire harness that specifies the switch interruption, a 2-pole condition-specifying wire harness that specifies the key interlocking and the reverse interlocking, and a 4-pole condition-specifying wire harness that specifies the key interlocking, the forward interlocking, the reverse interlocking, and the forward / reverse interlocking. In this case, the pre-specified group of wire harnesses includes a two-pole branch wire harness, a plurality of extension wire harnesses, a plurality of condition-specifying wire harnesses, a switch interrupt wire harness, and a plurality of two-pole condition-specifying wire harnesses. Therefore, only wire harnesses selected from the pre-specified group of wire harnesses can be used as wire harnesses required for operating the auxiliary equipment. [Effects of the Invention]

[0017] According to the present invention, an industrial vehicle can be provided that can reduce the time required to select a wire harness when an optional auxiliary device is installed in the industrial vehicle. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view of a forklift according to a first embodiment, as viewed from the right rear. [Figure 2] 1 is a side view of a forklift according to a first embodiment. [Figure 3] 1 is a plan view of a forklift according to a first embodiment. [Figure 4] FIG. 2 is an explanatory diagram showing a group of a plurality of types of wire harnesses for pre-specified auxiliary machines; [Figure 5] FIG. 10 is an explanatory diagram illustrating a configuration example of an intermediate wire harness for operating a rotating light. [Figure 6] FIG. 2 is an explanatory diagram schematically showing various accessories and operation switches. [Figure 7] FIG. 10 is an explanatory diagram showing a configuration example of an intermediate wire harness in a forklift according to a second embodiment. [Figure 8] FIG. 10 is an explanatory diagram showing a configuration example of an intermediate wire harness in a forklift according to a third embodiment. [Figure 9] FIG. 10 is a diagram showing a configuration of an intermediate wire harness in a forklift according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] (First embodiment) A forklift as an industrial vehicle according to a first embodiment will be described below with reference to the drawings. The forklift in this embodiment is a reach forklift. The terms "front / back," "left / right," and "up / down" that specify directions are used based on the state in which the forklift operator is seated in the driver's seat and facing the forward direction of the forklift.

[0020] A reach forklift (hereinafter simply referred to as a "forklift") 10 shown in Figure 1 has a mast assembly 13 that can move forward and backward between a pair of reach legs 12 provided at the front of a vehicle body 11. The mast assembly 13 is a device for handling cargo. Front wheels 14 are provided on the reach legs 12, and the rear of the vehicle body 11 is equipped with rear wheels 15 that serve as steering wheels and drive wheels, and caster wheels 16 that further stabilize the posture of the vehicle body 11.

[0021] As shown in Figures 1 and 2, a standing-type driver's seat 17 is provided at the rear right side of the vehicle body 11, and a storage frame 18 that mainly houses drive system elements such as an electric motor (not shown) is provided to the left of the driver's seat 17. As shown in Figure 2, a front frame 19 is disposed in front of the driver's seat 17. Operating levers 20, 21, 22, and 23 of the mast assembly 13 are disposed on the front frame 19.

[0022] The operating lever 20 is a tilt lever for tilt operation, and the operating lever 21 is a reach lever for reach operation. The operating lever 22 is a lift lever for raising and lowering a load, and the operating lever 23 is an accelerator lever for controlling the forward and reverse travel speed. The storage frame 18 is provided with a steering handle 24 for steering the rear wheels 15. A key switch 25 is provided on the driver's seat 17 side of the storage frame 18. The key switch 25 is turned ON / OFF with a key to switch the forklift 10 between an operable state and an inoperable stopped state.

[0023] An iron side panel 26 is provided on the right side of the driver's seat 17 so as to surround the right side of the driver's seat 17. The storage frame 18, front frame 19, and side panel 26 are attached to a lower frame 27 provided at the bottom of the vehicle body 11. The front and left and right sides of the driver's seat 17 are surrounded by the storage frame 18, front frame 19, and side panel 26.

[0024] As shown in FIG. 1 , the forklift 10 of this embodiment is provided with a head guard 28 above the driver's seat 17. The head guard 28 is supported by a left pillar 29 and a right pillar 30 provided on the vehicle body 11. The left pillar 29 is made of iron, and a base end of the left pillar 29 is welded to the left side of the vehicle body 11. The upper end of the left pillar 29 is welded to the lower part of the head guard 28. The left pillar 29 is also disposed forward of the driver's seat 17 in the fore-and-aft direction of the vehicle body 11. The right pillar 30 is made of iron, and has a hollow, wing-shaped cross section. The lower end of the right pillar 30 is welded to the side panel 26. The upper end of the right pillar 30 is welded to the lower part of the head guard 28.

[0025] As shown in Fig. 3, the head guard 28 has a frame body 31 formed from multiple members, and multiple crosspiece members 32. The frame body 31 forms the outer periphery of the head guard 28. The crosspiece members 32 are reinforcing members that extend in the front-rear direction inside the frame body 31 and are arranged in the width direction. The crosspiece members 32 are welded to the frame body 31.

[0026] The forklift 10 of this embodiment is equipped with a rotating light 33 on the head guard 28. The rotating light 33 is a light that rotates when its light-emitting portion is illuminated, and operates in conjunction with the forklift 10 moving backward. The rotating light 33 is not a standard accessory that is equipped on the forklift 10, but is an optional accessory that can be provided by the user of the forklift 10 or a dealer of the forklift 10. The rotating light 33 has a rotating light main body 34 and a lead wire 35, and the tip of the lead wire 33B is equipped with a pair of male and female bullet terminals 36A, 36B. The bullet terminals 36A, 36B are attached by the dealer.

[0027] In this embodiment, a vehicle body side wire harness 37 for connection to an accessory is drawn out from the vehicle body 11. The vehicle body side wire harness 37 is preliminary wiring for connection to an optional accessory. One end of the vehicle body side wire harness 37 is connected to an on-board controller (not shown) and a relay circuit (not shown) mounted inside the vehicle body 11. The other end is connected to an intermediate wire harness (described later). The vehicle body side wire harness 37 includes a vehicle body side harness main body 37A and a vehicle body side connector 37B. The vehicle body side harness main body 37A has a plurality of electrical wirings (not shown). The plurality of electrical wirings are aggregated into one and drawn out from the vehicle body 11 as the vehicle body side harness main body 37A. The vehicle body side connector 37B is provided at the end of the electrical wiring drawn out from the vehicle body 11. The vehicle body side connector 37B is a four-pole connector. Three of the four poles are connected to the signal lines for key interlocking, forward interlocking, and reverse interlocking, and the remaining pole is connected to the ground line. The vehicle body side connector 37B can supply the power necessary to operate the accessories from each signal line.

[0028] A plurality of intermediate wire harnesses are interposed between the vehicle body side wire harness 37 and the rotating light 33. Specifically, the plurality of intermediate wire harnesses include a condition-specifying wire harness 45, extension wire harnesses 51L and 51S, and an auxiliary equipment connecting wire harness 52. In this embodiment, one function is added to each wire harness. In this embodiment, the condition-specifying wire harness 45, the extension wire harnesses 51L and 51S, and the auxiliary equipment connecting wire harness 52 used to operate the rotating light 33 are wire harnesses selected from a group G of multiple types of wire harnesses specified in advance as shown in FIG. 4. The group G of multiple types of wire harnesses specified in advance is a group including only 11 types of wire harnesses that have already been designed.

[0029] First, the condition-specifying wire harnesses 41 to 46 will be described. The condition-specifying wire harnesses 41 to 46 are wire harnesses that specify the operation conditions of the accessories. In this embodiment, by using the condition-specifying wire harnesses, four operation conditions can be set for the operation conditions of the accessories: key interlock, forward interlock, reverse interlock, and forward / reverse interlock. The key interlock is an operation condition in which the accessories are operated when the key switch 25 is turned ON, and the operation of the accessories is canceled when the key switch 25 is turned OFF. The forward interlock is an operation condition in which the accessories are operated when the key switch 25 is turned ON and the operating lever 23 is operated to the forward side, and the operation of the accessories is canceled when the operating lever 23 is operated to a position other than the forward side. The reverse interlock is an operation condition in which the accessories are operated when the key switch 25 is turned ON and the operating lever 23 is operated to the reverse side, and the operation of the accessories is canceled when the operating lever 23 is operated to a position other than the reverse side. Forward / reverse linkage is an operating condition that activates the accessories when the key switch 25 is ON and the operating lever 23 is operated to the forward or reverse side, and the operation of the accessories is deactivated when the operating lever 23 is in the neutral position.

[0030] The condition-specific wire harness 41 is a key-linked wire harness that corresponds to key interlocking. The condition-specific wire harness 42 is a forward interlocking wire harness that corresponds to forward interlocking. The condition-specific wire harness 43 is a reverse interlocking wire harness that corresponds to reverse interlocking. The condition-specific wire harness 44 is a forward / reverse interlocking wire harness that corresponds to forward / reverse interlocking. The condition-specific wire harness 45 is a key / reverse interlocking wire harness that corresponds to key interlocking and reverse interlocking, and corresponds to a two-pole condition-specific wire harness. The condition-specific wire harness 46 is a four-operation selection wire harness that allows the operation condition to be freely selected from key interlocking, forward interlocking, reverse interlocking, and forward / reverse interlocking, and corresponds to a four-pole condition-specific wire harness.

[0031] In the forklift 10 of this embodiment, a key-reverse interlock condition-specifying wire harness 45 is selected as the condition-specifying wire harness and is connected to the vehicle body wire harness 37. The condition-specifying wire harness 45 has a condition-specifying harness main body 45A having a plurality of electrical wirings, a four-pole condition-specifying connector 45B, and a plurality of two-pole condition-specifying connectors 45C and 45D. The condition-specifying harness main body 45A has electrical wirings connected to the condition-specifying connector 45B and the condition-specifying connectors 45C and 45D.

[0032] The condition specification connector 45B is a four-pole connector provided at one end of the condition specification harness main body 45A and connectable to the vehicle body connector 35B. The condition specification connector 45C is a two-pole connector that specifies the key interlocking among the operating conditions. The condition specification connector 45D is a two-pole connector that specifies the reverse interlocking among the operating conditions. In this embodiment, the condition specification connector 45D that specifies the reverse interlocking among the operating conditions is connected to the extension wire harness 51. Since the condition specification connector 45C is not currently in use, a connector cap 47 for waterproofing and dustproofing is attached. Note that the condition specification connector 45C may be used when a new accessory with a reverse interlocking operating condition is used. Furthermore, if the operation condition of the rotating light 33 is to be changed from reverse interlocking to key interlocking, the extension connector 51B of the extension wire harness 51 is simply reconnected from the condition specification connector 45D to the condition specification connector 45C.

[0033] The condition-specific wiring harness 41 has a condition-specific harness main body 41A, a four-pole condition-specific connector 41B, and a two-pole condition-specific connector 41C for key interlocking. The condition-specific wiring harness 42 has a condition-specific harness main body 42A, a four-pole condition-specific connector 42B, and a two-pole condition-specific connector 42C for forward interlocking. The condition-specific wiring harness 43 has a condition-specific harness main body 43A, a four-pole condition-specific connector 43B, and a two-pole condition-specific connector 43C for reverse interlocking. The condition-specific wiring harness 44 has a condition-specific harness main body 44A, a four-pole condition-specific connector 44B, and a two-pole condition-specific connector 44C for forward / reverse interlocking. Note that the condition-specific harness main body 44A uses electrical wiring with a diode interposed therebetween.

[0034] The condition-specifying wire harness 46 includes a condition-specifying harness main body 46A, a four-pole condition-specifying connector 46B, and a plurality of two-pole condition-specifying connectors 46C, 46D, 46E, and 46F. The condition-specifying connector 46C is a key-linkage connector that specifies key-linkage, and the condition-specifying connector 46D is a forward-linkage connector that specifies forward-linkage. The condition-specifying connector 46E is a reverse-linkage connector that specifies reverse-linkage, and the condition-specifying connector 46F is a forward-linkage connector that specifies forward-linkage. The condition-specifying wire harness 46 can selectively select the operating conditions of the accessories, and can simultaneously use all of the operating conditions as long as they are within a preset current value range. Furthermore, the condition-specifying wire harness 46 can also add another accessory with a different operating condition.

[0035] Next, the extension wire harness 51 will be described. The extension wire harness 51 is a wire harness interposed between the condition-specifying wire harness and an accessory-connecting wire harness 52 that is connected to an accessory. The extension wire harness 51 has an extension harness main body 51A and a pair of two-pole extension connectors 51B. By making the lengths of the extension harness main body 51A different, multiple extension wire harnesses 51 of different lengths can be prepared.

[0036] The forklift 10 of this embodiment uses a long extension wire harness 51L that runs along the left pillar 29, and a short extension wire harness 51S. For convenience of explanation, in FIGS. 1 and 5, the two are distinguished by referring to the long extension wire harness 51L and the short extension wire harness 51S. One end of the extension wire harness 51L is connected to the condition-specific wire harness 45, and the other end is connected to one end of the extension wire harness 51S. The other end of the extension wire harness 51S is connected to the accessory-connecting wire harness 52. The extension wire harness 51 may be of three or more types by varying the length, rather than just two types, long and short.

[0037] Next, the accessory connecting wire harness 52 will be described. The accessory connecting wire harness 52 is a wire harness interposed between the extension wire harness 51 and the accessory. The accessory connecting wire harness 52 includes a harness main body 52A, a two-pole connector 52B connectable to the extension connector 51B of the extension wire harness 51, and a pair of male and female connector terminals 52C, 52D. The connector terminal 52C is male, and the connector terminal 52D is female. In this embodiment, the connector terminal 52C of the accessory connecting wire harness 52 is connected to the connector terminal 36B of the rotating light 33. The connector terminals 52D of the accessory connecting wire harness 52 are connected to the connector terminal 36A of the rotating light 33. The connector terminals are connected to each other by crimping, and covers (not shown) are attached to the crimped connector terminals.

[0038] The pre-specified group G of multiple types of wire harnesses includes the condition-specified wire harnesses 41 to 46, the extension wire harness 51, and the accessory-connecting wire harness 52, as well as a branch wire harness and a switch interrupt wire harness 55. The branch wire harnesses are a 4-pole branch wire harness 53 that branches into multiple four-pole wires and a 2-pole branch wire harness 54 that branches into multiple two-pole wires. The 4-pole branch wire harness 53 has a 4-pole branch harness main body 53A, a branch origin connector 53B, and a pair of branch destination connectors 53C. The branch origin connector 53B is connectable to the vehicle body connector 35B. The pair of branch destination connectors 53C is connectable to the condition-specified connectors 41B, 42B, 43B, 44B, 45B, and 46B. The 2-pole branch wire harness 54 has a 2-pole branch harness main body 54A, a branch origin connector 54B, and a pair of branch destination connectors 54C. The branching source connector 54B and the pair of branching destination connectors 54C are connectable to two-pole connectors.

[0039] The pre-specified group G of multiple types of wire harnesses includes a switch interrupt wire harness 55 that specifies the operating condition of a switch interrupt by the ON / OFF of an operator's operation switch 56 for the specified operating condition. As shown in FIG. 6 , the operation switch 56 is a toggle switch and includes a switch main body 57, a wire 58, and a switch interrupt connector 59 provided at the end of the wire 58. The switch main body 57 is attached to a bracket 60. When the operation switch 56 is provided on the forklift 10, the operation switch 56 is provided to the left of the operation lever 20 on the front frame 19. However, the installation position of the operation switch 56 is not limited to the front frame 19.

[0040] The switch interrupt wire harness 55 is a wire harness that is designed to be used with an operation switch 56. The switch interrupt wire harness 55 has an interrupt harness main body 55A, a pair of two-pole connectors 55B, and a switch interrupt connector 55C. The pair of two-pole connectors 55B can be connected to two-pole connectors of other wire harnesses. The switch interrupt connector 55C can be connected to a switch interrupt connector 59 of the operation switch 56.

[0041] As shown in FIG. 6, optional accessories include a driving recorder 61, a work lamp 62 that illuminates the rear, an interior light 63 that illuminates the driver's seat, and a remote control 64 for opening and closing the shutter, in addition to the rotating light 33. The driving recorder 61, the work lamp 62, the interior light 63, and the remote control 64 each have a lead wire 35 and a bullet terminal 36A, 36B attached to the lead wire 35. Although not shown, optional accessories include a blue light, an electric fan, a heater, a warning buzzer, etc. The accessories are broadly divided into general accessories and warning accessories. General accessories include the driving recorder 61, the work lamp 62, the interior light 63, etc., while warning accessories include the rotating light 33, the blue light, etc., and they often operate under specific conditions other than key interlocking.

[0042] Next, the selection of the intermediate wire harness required for setting up the accessories of the forklift 10 of this embodiment will be described. The optional accessory of the forklift 10 of this embodiment is the rotating light 33. The installation position of the rotating light 33, its operating conditions, whether or not a branching of the wire harness is required, and whether or not an operation switch 56 is provided are determined based on the user's requirements. In this embodiment, the rotating light 33 is located on the head guard 28, and its operating condition is reverse-linked. Note that the rotating light 33 may be installed in a position other than the head guard 28. In this embodiment, there are no plans to install accessories other than the rotating light 33, so a branching of the wire harness is not required. Furthermore, the operation switch 56 is not required.

[0043] The rotating light 33 is fixed on the head guard 28. Furthermore, since no branching of the wire harness is required and the operating condition of the rotating light 33 is reverse-linked, condition-specific wire harnesses 43, 45, and 46 are candidates from a pre-specified group G of multiple types of wire harnesses as condition-specific wire harnesses connectable to the vehicle body wire harness 37. The condition-specific wire harness 45 is selected because there is a possibility that the rotating light 33 will be operated in key-linked operation or that another accessory that will be operated in key-linked operation will be added. A connector cap 47 is attached to a condition-specific connector 45C that is not used in the condition-specific wire harness 45.

[0044] The extension wire harness 51 is routed along the left pillar 29, so that the extension wire harness 51L and the extension wire harness 51S for length adjustment are selected from a pre-specified group G of multiple types of wire harnesses. The auxiliary equipment connecting wire harness 52 is selected to be interposed between the rotating light 33 and the extension wire harness 51S. In FIG. 4, the intermediate wire harness is surrounded by a dotted line frame.

[0045] After being manufactured, the forklift 10 is transported from the manufacturing factory to a dealer. At the dealer, optional accessories are installed according to the user's request. In this embodiment, the rotating light 33, which is an optional accessory, is installed to the head guard 28, and an intermediate wire harness required for operating the rotating light 33 is also installed. The intermediate wire harness required for operating the rotating light 33 is routed around the left pillar 29 and the head guard 28 and connected to each other, which is a relatively simple process. In this embodiment, a harness cover 65 is attached along the left pillar 29 to hide the extension wire harness 51L as an aesthetic measure (see FIG. 5). Note that the harness cover 65 is omitted from FIG. 1.

[0046] In the forklift 10 of this embodiment, the activation condition of the rotating light 33 is set to reverse-linked operation, but this can also be changed to key-linked operation. In this case, by connecting the extension connector 51B of the extension wire harness 51L, which is connected to the condition-specifying connector 45D, to the condition-specifying connector 45C, the rotating light 33 is activated when the key switch 25 is turned on. Note that the selection of the intermediate wire harness required for setting up the auxiliary equipment may be performed using a computer-based support tool for harness selection. Wire harnesses that can be used as intermediate wire harnesses are pre-registered in the support tool. When various conditions such as the type of auxiliary equipment, operating conditions, and installation location of the auxiliary equipment are input, the support tool correctly selects the necessary wire harness if configuration is possible.

[0047] The forklift 10 according to this embodiment has the following advantages. (1) The intermediate wire harness is connected to the vehicle body wire harness 37 and the accessories, and at least one wire harness is selected from a pre-specified group G of multiple types of wire harnesses. In this embodiment, the condition-specifying wire harness 41, the extension wire harness 51, and the accessory-connecting wire harness 52 are selected as the intermediate wire harness from the pre-specified group G of multiple types of wire harnesses. Therefore, even if optional accessories are installed, the time required to design the condition-specifying wire harness 45, the extension wire harness 51, and the accessory-connecting wire harness 52 is reduced. As a result, the time required to select the wire harness can be reduced, and the time until the forklift 10 is delivered to the user can be shortened. Furthermore, the manufacturing cost of the forklift 10 can be reduced.

[0048] (2) By setting the number of poles of the vehicle body connector 37B to four, the type of vehicle body wire harness 37 can be unified. Furthermore, the condition-specifying wire harness 45 can have a plurality of two-pole condition-specifying connectors 45C, 45D that can be connected to the extension wire harness 51, allowing the operation conditions of the accessories to be selected from a plurality of options. Even after the operation conditions have been specified, it is easy to change from reverse interlock to key interlock without replacing the condition-specifying wire harness 45. Furthermore, because changing intermediate wire harnesses can be performed at a dealer, it is easy to change the operation conditions of accessories or install additional accessories by changing the condition-specifying wire harness 45, for example.

[0049] (3) The operating conditions of the accessories are key interlocking by turning on the key switch 25 provided on the vehicle body 11, forward interlocking which is interlocked only with forward driving, reverse interlocking which is interlocked only with reverse driving, and forward / reverse interlocking which is interlocked with forward driving and reverse driving. At least one operating condition is specified by selecting the condition-specifying wire harnesses 41 to 46. This covers most of the operating conditions required for the accessories. This makes it possible to reduce the number of types of wire harnesses that need to be designed from the beginning to specify the operating conditions of the accessories.

[0050] (4) The plurality of condition-specifying connectors include a condition-specifying connector 45C that specifies key interlocking and a condition-specifying connector 45D that specifies reverse interlocking. This allows for the combination of the rotating light 33 that operates in conjunction with reverse and a key-interlocking accessory.

[0051] (5) The types of wire harnesses are limited because the intermediate wire harnesses are limited to those included in the pre-specified group G of wire harnesses. Therefore, about 80% of the intermediate wire harnesses, which previously required new designs or production based on past performance, can now be selected from the pre-specified group G of wire harnesses. As a result, the burden on forklift manufacturers and harness manufacturers that produce wire harnesses is reduced.

[0052] (6) Even in the case of an existing forklift, by changing the vehicle body side wire harness for an optional accessory to the vehicle body side wire harness 37, the intermediate wire harness can be selected from the wire harnesses included in the pre-specified multiple types of wire harness group G. Furthermore, even in the case of a used vehicle or a rental vehicle, the present invention can be applied with only a slight modification.

[0053] (Second embodiment) Next, a forklift according to a second embodiment will be described. This embodiment differs from the first embodiment in that the optional auxiliary equipment is a work lamp and an operation switch is used. In this embodiment, the same components as those in the first embodiment will be referred to and the same reference numerals will be used.

[0054] As shown in FIG. 7, an optional accessory of the forklift 70 is a work lamp 62. The work lamp 62 is an accessory that makes it easier to perform loading and unloading operations at night or in dark places. The work lamp 62 does not have an ON / OFF switch. In this embodiment, the work lamp 62 is installed at the rear of the head guard 28 to illuminate the area behind the forklift 70. The operation condition of the work lamp 62 is linked to the key, and no accessories other than the work lamp are provided. In this embodiment, the work lamp 62 operates (turns on) in linkage with the key switch 25 being turned ON, but the work lamp 62 is configured to be able to be turned off at the operator's discretion.

[0055] The forklift 70 of this embodiment requires an operation switch 56 to activate the optional work lamp 62. Furthermore, as intermediate wire harnesses, a condition-specifying wire harness 41, extension wire harnesses 51L and 51S, a switch interrupt wire harness 55, and an accessory-connecting wire harness 52 are selected from a pre-specified group G of multiple types of wire harnesses. The vehicle body-side wire harness 37 is connected to the condition-specifying wire harness 41. The extension wire harness 51L is connected to the condition-specifying wire harness 41.

[0056] One connector 55B of the switch interrupt wire harness 55 is connected to the extension wire harness 51L, and the other connector 55B is connected to the extension wire harness 51S. The switch interrupt connector 55C of the switch interrupt wire harness 55 is connected to the switch interrupt connector 59 of the operation switch 56. The connector 52B of the accessory connecting wire harness 52 is connected to the extension wire harness 51S. The connector 52C of the accessory connecting wire harness 52 is connected to the connector terminal 36B of the work lamp 62, and the connector terminal 52D of the accessory connecting wire harness 52 is connected to the connector terminal 36A of the work lamp 62. In FIG. 7, the intermediate wire harness is surrounded by a dotted line frame.

[0057] In this embodiment, when the operation switch 56 is in the ON state, the work lamp 62 is activated (lit) by key interlocking. If the operator operates the operation switch 56 to the OFF state while the work lamp 62 is lit by key interlocking, the work lamp 62 is turned off.

[0058] According to this embodiment, as in the first embodiment, the condition-specific wire harness 41, the extension wire harness 51, and the accessory-connecting wire harness 52 are selected from a pre-specified group G of multiple types of wire harnesses, eliminating the need to design them from scratch. As a result, the delivery time of the forklift 10 to the user can be shortened. Furthermore, even if the key-linked work lamp 62 is ON, it can be turned off by turning the operation switch 56 OFF even if the key switch 25 is ON. In other words, even if at least one of the accessory operation conditions is specified as the operation condition from key-linked, forward-linked, reverse-linked, and forward-reverse-linked, the operation of the accessory can be controlled by turning the operation switch 56 ON / OFF. The operation switch 56, the bracket 60, and the switch interrupt wire harness 55 may be packaged as a kit so that they can be selected.

[0059] (Third embodiment) Next, a forklift according to a third embodiment will be described. In this embodiment, the optional accessory is a rotating light, but the operating conditions of the rotating light are not yet determined. In this embodiment, the same components as those in the first embodiment will be referred to and the same reference numerals will be used.

[0060] As shown in Figure 8, the optional accessory of the forklift 80 is the rotating light 33. Because the operating conditions of the rotating light 33 are undetermined, a condition-specifying wire harness 46 that can specify all four conditions is connected to the vehicle body-side wire harness 37. The condition-specifying wire harness 46 has a condition-specifying connector 46C that is a key interlocking connector, a condition-specifying connector 46D that is a forward interlocking connector, a condition-specifying connector 46E that is a reverse interlocking connector, and a condition-specifying connector 47F that is a forward / reverse interlocking connector. In Figure 8, the intermediate wire harness is surrounded by a dotted line frame.

[0061] The operating conditions of the accessories are determined by the user's wishes, but there may be cases where the user is undecided about the operating conditions during negotiations and wants to actually check the operation of the rotating light 33 under each operating condition. In this case, by selecting and using the condition-specifying wire harness 46, the forklift 80 can be shipped even if the operating conditions of the rotating light 33 have not been determined.

[0062] In FIG. 8 , the forward / reverse interlocking condition-specific connector 46F is connected to the extension wire harness 51L. However, by sequentially reconnecting the extension wire harness 51L to the condition-specific connectors 46C, 46D, and 46E, the operation of the rotating light 33 under all operating conditions can be confirmed. Once the operating condition is determined, the corresponding connector is connected to the extension wire harness 51L, and connector caps 47 are attached to unused connectors. In this embodiment, even if the extension wire harness 51 is connected to a connector for a specific operating condition, the operating condition of the accessories can be changed by changing the connected connector. In other words, even if the operating condition is not determined during negotiation, the user of the forklift 80 can change it after delivery. Furthermore, even if the operating condition of the accessories is set to a different operating condition from the determined operating condition, the setting can be easily changed by reconnecting to the determined condition-specific connector.

[0063] (Fourth embodiment) Next, a forklift according to a fourth embodiment will be described. This embodiment differs from the first embodiment in that an optional auxiliary device is provided. In this embodiment, the same components as those in the first embodiment will be referred to and the same reference numerals will be used.

[0064] 9, the forklift 90 is equipped with a rotating light 33, which is an optional accessory provided by the user or dealer, as well as a drive recorder 61, an interior light 63, and a remote control 64. The rotating light 33 is linked to reverse operation, and the drive recorder 61, the interior light 63, and the remote control 64 are linked to the key, but the interior light 63 is set to be switch-interrupted. For this reason, condition-specific wire harnesses 41 and 45 are selected from a group G of multiple types of wire harnesses that have been specified in advance.

[0065] A 4-pole branch wire harness 53 is interposed between the vehicle-body side wire harness 37 and the condition-specific wire harnesses 41, 45. A branch source connector 53B of the 4-pole branch wire harness 53 is connected to a vehicle-body side connector 37B of the vehicle-body side wire harness 37. One branch destination connector 53C of the 4-pole branch wire harness 53 is connected to a condition-specific connector 41B of the condition-specific wire harness 41. The other branch destination connector 53C of the 4-pole branch wire harness 53 is connected to a condition-specific connector 45B of the condition-specific wire harness 45. By using the 4-pole branch wire harness 53, it is possible to double the number of 4-pole connectors without modifying the vehicle-body side wire harness 37.

[0066] The key-interlocking condition-specifying wire harness 41 connected to one of the branching connectors 53C is connected to an extension wire harness 51L. The extension wire harness 51L is connected to an accessory-connecting wire harness 52 connected to a remote control 64. Therefore, the remote control 64 becomes operable when the key switch 25 is turned on.

[0067] One extension connector 51B of the extension wire harness 51 is connected to the key-linked condition-specific connector 45C of the condition-specific wire harness 45, which is connected to the other branch destination connector 53C. A branch source connector 54B of a two-pole branch wire harness 54 is connected to the other extension connector 51B of the extension wire harness 51. The extension connector 51B is connected to one branch destination connector 54C of the two-pole branch wire harness 54. The use of the two-pole branch wire harness 54 makes it possible to add connectable optional accessories. The extension wire harness 51S is connected to the accessory-connecting wire harness 52, which is connected to a drive recorder 61. Therefore, the drive recorder 61 is activated when the key switch 25 is turned on.

[0068] One connector 55B of a switch interrupt wire harness 55 is connected to the other branch destination connector 54C of the two-pole branch wire harness 54. The other connector 55B is connected to a connector 52B of the accessory connecting wire harness 52, which is connected to the interior light 63. A switch interrupt connector 55C of the switch interrupt wire harness 55 is connected to a switch interrupt connector 59 of the operation switch 56. Therefore, the interior light 63 is activated when the key switch 25 is turned ON, but can also be turned ON / OFF by operating the operation switch 56.

[0069] The condition-specific wire harness 45 is connected to a reverse-link condition-specific connector 45D of the condition-specific wire harness 45, which is connected to the other branch connector 53C, and an extension connector 51B is connected to the extension wire harness 51L, which is connected to an extension wire harness 51S. The extension wire harness 51S is connected to the accessory-connecting wire harness 52, which is connected to the rotating light 33. Therefore, the rotating light 33 is activated when the forklift 90 is reversed. In Figure 9, the intermediate wire harness is surrounded by a dotted line frame.

[0070] In this embodiment, a 4-pole branch wire harness 53 selected from a plurality of types of wire harness group G is interposed between the vehicle body wire harness 37 and the condition-specific wire harnesses 41, 45. Using the 4-pole branch wire harness 53 not only allows for an increased number of accessories, but also eliminates the need to modify the vehicle body wire harness 37 or design a wire harness that specifies operating conditions in order to increase the number of accessories. Using the 2-pole branch wire harness 54 also allows for the addition of connectable accessories. Furthermore, since the branch wire harness is included in the pre-specified wire harness group G, branching of the wire harness is not required when installing optional accessories or accessories provided by the user or dealer. This allows for the installation of accessories even at dealers where branching of wire harnesses is difficult.

[0071] The above-described embodiments include the technical ideas described below. In a method for manufacturing an industrial vehicle having a vehicle body, an auxiliary device mounted on the vehicle body, a vehicle body side wire harness pulled out from the vehicle body for connecting to the auxiliary device, and a plurality of intermediate wire harnesses connecting the vehicle body side wire harness and the auxiliary device, the plurality of intermediate wire harnesses include a condition-specific wire harness connectable to the vehicle body side wire harness and specifying an operating condition of the auxiliary device, an extension wire harness connectable to the condition-specific wire harness, and an auxiliary device-connecting wire harness connectable to the extension wire harness and the auxiliary device, and the condition-specific wire harness, the extension wire harness, and the auxiliary device-connecting wire harness are each selected from a group of a plurality of types of wire harnesses specified in advance. According to this technical concept, even if optional accessories are installed, it is not necessary to design a condition-specific wire harness, an extension wire harness, and an accessory-connecting wire harness from scratch, which makes it possible to shorten the time until the industrial vehicle is delivered to the user.

[0072] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the spirit of the invention. For example, the following modifications may be made.

[0073] In the above embodiment, the intermediate wire harnesses selected from the pre-specified group of multiple types of wire harnesses are the condition-specified wire harness, the extension wire harness, and the auxiliary equipment-connecting wire harness. However, this is not limited to this. The intermediate wire harness may be selected from at least one of the condition-specified wire harness, the extension wire harness, and the auxiliary equipment-connecting wire harness. For example, only the condition-specified wire harness may be selected as the intermediate wire harness, and the condition-specified wire harness may be connected to the vehicle body wire harness and the auxiliary equipment. In the above embodiment, the four accessory operation conditions, i.e., key interlocking, forward interlocking, reverse interlocking, and forward / reverse interlocking, are described as examples, but are not limited to these four conditions. The accessory operation conditions may include, for example, a speed alarm interlocking that is interlocked with a speed warning, or a height interlocking that is interlocked with the height of the forks, and the operation conditions may be set as appropriate. In the above embodiment, the extension wire harness is provided in two types, long and short, but this is not limiting. The extension wire harness may be provided in three or more types with different lengths. In the above embodiment, the condition-specifying wire harness has a combination of key interlocking and reverse interlocking as an example of having a plurality of condition-specifying connectors, but this is not limited thereto. The combination of a plurality of condition-specifying connectors may be, for example, a combination of forward interlocking and reverse interlocking, or a combination of key interlocking and forward interlocking. In the above embodiment, the rotating light, work lamp, drive recorder, interior light, and shutter remote control are exemplified as accessories, but the present invention is not limited to these. For example, the accessories may be a blue light, a stacked indicator light, a fan, a heater, or a warning buzzer. While some accessories are provided by the user or the dealer and assembled by the dealer, some accessories may be provided by the forklift manufacturer and assembled by the manufacturer. In the above embodiment, a reach forklift is used as an example of an industrial vehicle, but the industrial vehicle is not limited to this. The industrial vehicle may be, for example, a counter-load forklift, a towing vehicle, a towing tractor, an automated guided vehicle, or any other industrial vehicle that can be equipped with optional accessories. [Explanation of symbols]

[0074] 10, 70, 80, 90 Reach forklift (industrial vehicle) 11 Body 17 Driver's seat 25 key switches 28 Head Guard 33 Rotating light (auxiliary) 37 Body side wiring harness 37A Body side harness main body 37B Body side connector 41, 42, 43, 44, 45, 46 Condition-specific wiring harness 41A, 42A, 43A, 44A, 45A, 46A Condition-specific harness body 41B, 42B, 43B, 44B, 45B, 46B condition specific connectors 41C, 42C, 43C, 44C, 45C, 46C condition specific connectors 45D, 46D, 46E, 46F condition-specific connectors 47 Connector cap 51 (51L, 51S) Extension Wire Harness 52 Auxiliary equipment connection wire harness 53 4-pole branch wire harness 53A 4-pole branch harness body 53B Branching connector 53C Branch Connector 54 2-pole branch wire harness 54A 2-pole branch harness body 54B Branching connector 54C Branch connector 55 Switch interrupt wire harness 56 Operation switch 61 Drive recorder (auxiliary equipment) 62 Work lamp (auxiliary) 63 Interior light (auxiliary) 64 Remote control (auxiliary equipment) G Wire harness group

Claims

1. The car body and An auxiliary machine mounted on the vehicle body; a vehicle body side wire harness provided on the vehicle body and used for connecting the auxiliary equipment; an intermediate wire harness connected to the vehicle body side wire harness and the auxiliary equipment, The vehicle body side wire harness is a vehicle body-side harness main body having a plurality of electrical wirings; a vehicle body side connector provided at an end of the plurality of electrical wirings, The intermediate wire harness is selected from at least one of a group of a plurality of types of wire harnesses specified in advance, The group of multiple types of wire harnesses includes: a condition specifying wire harness that specifies an operating condition of the auxiliary device; an auxiliary equipment connecting wire harness connectable to the auxiliary equipment; an extension wire harness connectable to the condition-specifying wire harness or the auxiliary machine connecting wire harness;

2. The number of poles of the vehicle body side connector is four, The condition-specific wire harness is a condition-specific harness main body having the plurality of electrical wirings; a condition-specifying connector provided at one end of the condition-specifying harness main body and connectable to the vehicle body-side connector; 2. The industrial vehicle according to claim 1, further comprising a plurality of two-pole condition-specifying connectors provided at the other end of the condition-specifying harness body and connectable to the extension wire harness.

3. The operating conditions of the auxiliary machinery are: A key interlock is performed by turning on a key switch provided on the vehicle body; Forward linkage, which is linked only to forward driving, and Reverse linkage, which is linked only when driving in reverse, and a forward / reverse interlocking mechanism that is interlocked with the forward traveling and the reverse traveling; 3. The industrial vehicle according to claim 2, wherein at least one operating condition is specified by selecting the condition specifying wire harness.

4. a four-pole branched wire harness that branches into a plurality of four poles is interposed between the vehicle body side wire harness and the condition-specific wire harness; 4. The industrial vehicle according to claim 2, wherein the four-pole branched wire harness is selected from the group of the plurality of types of wire harnesses.

5. The operating conditions of the auxiliary machinery are: At least one operating condition is specified from the key interlock, the forward interlock, the reverse interlock, and the forward / reverse interlock, and a switch interrupt is performed by turning an operation switch ON / OFF, 4. The industrial vehicle according to claim 3, wherein a switch interruption wire harness for specifying an operating condition of the switch interruption is interposed between the extension wire harness and the auxiliary device connection wire harness.

6. The plurality of condition-specific connectors include: a key interlock connector for identifying the key interlock; 4. The industrial vehicle according to claim 3, further comprising a reverse interlock connector for specifying the reverse interlock.

7. The plurality of condition-specific connectors include: a key interlock connector for identifying the key interlock; a forward linkage connector for identifying the forward linkage; a reverse interlock connector for identifying the reverse interlock; 4. The industrial vehicle according to claim 3, further comprising a forward / reverse interlock connector for specifying the forward / reverse interlock.

8. The group of the plurality of types of wire harnesses specified in advance includes: the 4-pole branched wire harness; a two-pole branched wire harness that branches into multiple poles; A plurality of the extension wire harnesses having different lengths; the condition-specifying wire harness that specifies the key interlock; the condition specifying wire harness specifying the forward interlock; the condition specifying wire harness that specifies the reverse drive interlock; the condition specifying wire harness specifying the forward / reverse linkage; the switch interrupt wire harness for identifying the switch interrupt; a two-pole condition-specific wire harness that specifies the key interlock and the reverse interlock; 6. The industrial vehicle according to claim 5, further comprising a four-pole condition specifying wire harness that specifies the key interlock, the forward interlock, the reverse interlock, and the forward / reverse interlock.

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