JP2005022566A - Wheel driving part structure - Google Patents

Wheel driving part structure Download PDF

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Publication number
JP2005022566A
JP2005022566A JP2003191547A JP2003191547A JP2005022566A JP 2005022566 A JP2005022566 A JP 2005022566A JP 2003191547 A JP2003191547 A JP 2003191547A JP 2003191547 A JP2003191547 A JP 2003191547A JP 2005022566 A JP2005022566 A JP 2005022566A
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Japan
Prior art keywords
housing
wheel drive
hydraulic
drive unit
hydraulic motor
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JP2003191547A
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JP4508561B2 (en
Inventor
Naoyuki Ito
尚之 伊藤
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TCM Corp
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TCM Corp
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Priority to JP2003191547A priority Critical patent/JP4508561B2/en
Priority to PCT/JP2004/009174 priority patent/WO2005002896A1/en
Publication of JP2005022566A publication Critical patent/JP2005022566A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0015—Disposition of motor in, or adjacent to, traction wheel the motor being hydraulic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/07509—Braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/07572—Propulsion arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0038—Disposition of motor in, or adjacent to, traction wheel the motor moving together with the wheel axle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0092—Disposition of motor in, or adjacent to, traction wheel the motor axle being coaxial to the wheel axle

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Motor Power Transmission Devices (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel driving part structure having high design flexibility for a vehicle and requiring low manufacturing cost. <P>SOLUTION: A housing 12 which is provided under a vehicle body and storing a front driving shaft system 11 is constituted in a cylindrical shape. Hydraulic motors 14 for driving front wheels are disposed on both of the housing 12, and a brake device 19 whose braking condition is released by hydraulic supply is provided on the other part than a one-side end, where front wheels 3 of an output shaft 14a are attached, at these respective hydraulic motors 14. An access hole 12c to actuate a brake releasing means 20 capable of releasing the braking condition of the brake device 19 is formed at the housing 12. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、例えばフォークリフトなどの産業車両における車輪駆動部構造に関するものである。
【０００２】
【従来の技術】
従来、フォークリフトにおいては、図７に示すように、車輪５１を回転させる駆動軸系を収容するハウジング５２は、平面視がＴ字形状にされるとともに、このハウジング５２内には、車輪５１を駆動するための油圧モータ５３およびこれら両油圧モータ５３，５３に油圧を供給する油圧ポンプ５４が収容されていた。
【０００３】
すなわち、上記ハウジング５２は、車輪５１が連結される駆動軸部６１およびこの駆動軸部６１を回転させる油圧モータ５３が両側に収容された筒状の主ハウジング部５２ａと、この主ハウジング部５２ａの中間部からＴ字形状に突設されて油圧ポンプ５４が収容された副ハウジング部５２ｂとから構成されていた（例えば、特許文献１参照）。
【０００４】
【特許文献１】
独国特許出願公開第４４０５８７２号明細書
【０００５】
【発明が解決しようとする課題】
上記車輪の駆動軸部構造によると、ハウジング５２がＴ字形状にされるとともに、このハウジング５２内に、車輪５１に連結される駆動軸部６１および油圧モータ５３並びに両油圧モータ５３，５３に油圧を供給する油圧ポンプ５４を収容するように構成されているので、ハウジング５２が複雑な形状となり、機械加工に時間を要し製作コストが高くなるとともに、油圧ポンプ５４の配置も必然的に限定されるため、例えばフォークリフトなどの車体を設計する際に、その自由度が非常に狭いという問題があった。
【０００６】
そこで、本発明は、製作コストが安価であるとともに、車体の設計の自由度が高い車輪駆動部構造を提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記課題を解決するために、本発明の請求項１に係る車輪駆動部構造は、車体の下方に設けられて車輪駆動部を収容するハウジングを筒状に構成し、このハウジングの両端部に、車輪駆動用の油圧モータを配置するとともに、この油圧モータにおける出力軸の車輪が取り付けられる一端部とは反対側の他端部に、湿式ブレーキ装置を設けたものである。
【０００８】
また、請求項２に係る車輪駆動部構造は、請求項１に記載の構造におけるハウジングに、湿式ブレーキ装置の制動状態を解除し得る解除手段を作動させるためのアクセスホールを形成したものである。
【０００９】
また、請求項３に係る車輪駆動部構造は、請求項１または２に記載の構造において、油圧モータに油圧を供給するとともにハウジングの近傍に配置される油圧ポンプ用の凹状部を、当該ハウジングに形成したものである。
【００１０】
さらに、請求項４に係る車輪駆動部構造は、請求項１乃至３のいずれかに記載の構造におけるハウジングに油圧モータを取り付けた際に、当該油圧モータの一部がハウジングから突出するように、モータ取付用台座部をハウジングに形成したものである。
【００１１】
上記の構成によると、車輪駆動部を収容するハウジングを筒状に形成したので、従来のように、ハウジングをＴ字形状に構成したものに比べて、形状が簡単になり、したがって機械加工を容易に行うことができるので、安価に製作し得る。
【００１２】
また、油圧ポンプをハウジングの外部に設置するようにしたので、従来のように、ハウジングをＴ字形状に構成して油圧ポンプを一体的に収容させたものに比べて、その保守点検を容易に行うことができるとともに、車体における各構成機器の配置の自由度を大幅に向上させ得る。
【００１３】
【発明の実施の形態】
以下、本発明の実施の形態に係る車輪駆動部構造を、産業車両、例えばフォークリフトに適用した場合について、図１〜図６に基づき説明する。
【００１４】
まず、フォークリフトの概略構成を図１および図２に基づき説明する。
このフォークリフト１は、車体２の前部の左右に前車輪（以下、前輪という）３が設けられるとともに、後部の左右に後車輪（以下、後輪という）４が設けられ、また車体２の前端側には、荷物保持用のフォーク部５を有し且つ上下方向で伸縮自在にされた支柱体（マストともいう）６が前輪３の車軸に対して回動自在に設けられるとともに、この支柱体６は傾動用シリンダ装置（チルト用シリンダ装置ともいう）７により鉛直面内で所定角度でもって前方に傾動自在にされている。
【００１５】
そして、このフォークリフト１における駆動方式は、前輪駆動方式にされており、後輪については、例えば非駆動でハンドルにより換向されるものであるが、本発明の要旨は、前輪駆動部にあるため、以下の説明においては、この部分に着目して説明する。
【００１６】
すなわち、図３〜図５に示すように、フォークリフト１の車体２の前方下部には、前輪駆動軸系（フロントアクスル）１１を収容する筒状ハウジング１２が取付部材１３を介して取り付けられている。
【００１７】
そして、このハウジング１２の左右両端部には、直接、前輪３に連結されて当該前輪３を回転駆動するための油圧モータ（ＨＳＴモータともいう）１４が配置され、またその中間部（中央部）で且つ後方側面には、これら両油圧モータ１４に油圧を供給するとともに当該ハウジング１２とは異なる位置で且つハウジング１２に接近した位置で車体側に取り付けられる油圧ポンプ１５を接近して配置させ得る（案内させ得る）凹状部１２ａが形成されている。
【００１８】
上記油圧モータ１４については、図３に示すように、そのケーシング１６の中間部に突設されたフランジ部１６ａにより、上記ハウジング１２の端部（フランジ部で、モータ取付用台座部の一例でもある）１２ｂにボルト１７により取り付けられている。すなわち、油圧モータ１４は、その一部がハウジング１２から突出するように、当該ハウジング１２に取り付けられている。
【００１９】
また、図３および図６に示すように、上記油圧モータ１４の出力軸部１４ａの外側の一端部には、車輪すなわち前輪３の取付用ディスク部３ａにボルト・ナット１８により連結される連結板部１４ｂが形成されるとともに、この出力軸部１４ａの他端部には、油圧の供給によりその制動状態が解除されるブレーキ装置１９が設けられており、このブレーキ装置１９には、例えば油圧ポンプ１５が故障した際に、その制動状態を手動にて解除し得る制動解除手段２０が具備されている。
【００２０】
すなわち、上記ブレーキ装置１９は、出力軸部１４ａの他端部に取り付けられた湿式ブレーキディスク部２１と、このブレーキディスク部２１をブレーキ状態および制動解除状態にさせる油圧シリンダ部［そのピストンがブレーキディスク部に連動するようにされた（係合された）］２２と、この油圧シリンダ部２２におけるピストン２２ａを常時押圧してブレーキディスク部２１を制動状態にさせるためのスプリング２３とから構成されており、そして停止時においては、スプリング２３の付勢力により制動状態に維持されているが、運転時においては、油圧シリンダ部２２への油圧の供給により、当該スプリング２３の付勢力に抗してピストン２２ａが移動させられて解除状態にされる。
【００２１】
また、上記制動解除手段２０は、ピストン２２ａの中央部に形成されためねじ部２４と、そのケーシング１６に形成された穴部１６ｂを介して挿脱自在に設けられて上記めねじ部２４に係脱自在にされたボルト（図示しないが、解除用操作具ともいう）とから構成されている。
【００２２】
例えば、油圧ポンプ１５が故障した場合には、スプリング２３の付勢力により制動状態が維持されることになるが、ケーシング１６に形成された穴部１６ｂからボルトを挿入し（図６の矢印ａ参照）ピストン２２ａのめねじ部２４に係合させて回転させることにより、ピストン２２ａを強制的にスプリング２３の付勢力に抗して移動させれば、その制動状態を解除することができる。
【００２３】
したがって、解除用操作具であるボルトを挿入するためのアクセスホール（穴部または切欠部）１２ｃが、当該油圧モータ１４の穴部１６ｂに対応する位置のハウジング１２に形成されている（図３参照）。
【００２４】
なお、上記ハウジング１２の左右位置には環状の凹状部１２ｄが形成されるとともに、これら両凹状部１２ｄに支柱体６に連結された環状支持部材２５が回動自在に設けられている（図２参照）。
【００２５】
上記構成において、フォークリフト１にて荷役作業を行う場合には、油圧ポンプ１５より供給される油圧がハウジング１２の両端部に設けられた油圧モータ１４に供給されて、前輪３が回転されて走行が行われ、またハウジング１２に支持された支柱体６についても、荷役用油圧ポンプ（図示せず）から油圧が傾動用シリンダ装置７に供給されて傾動動作が行われる。なお、説明していないが、伸縮用シリンダ装置により支柱体６の伸縮が行われて、フォーク部５の昇降が行われる。勿論、油圧が供給されている限り、各油圧モータ１４に設けられたブレーキ装置１９は制動解除状態であり、走行を自由に行い得る。
【００２６】
ところで、油圧ポンプ１５が故障により停止した場合、油圧の供給が停止されるため、当然に、ブレーキ装置１９が制動状態となり、当該フォークリフト１が走行することができなくなるが、制動状態を解除したい場合には、アクセスホール２ｃから解除用操作具であるボルトを、油圧モータ１４のケーシング１６内のピストン２２ａに形成されためねじ部２４に螺合させて油圧シリンダ部２２のピストン２２ａを強制的に移動させればよい。
【００２７】
このように、前輪駆動軸系１１を収容するハウジング１２を筒状に形成するとともに、その両端部に前輪駆動用の油圧モータ１４だけを配置するようにしたので、従来のように、ハウジングをＴ字形状に構成するとともに油圧モータおよび油圧ポンプを収容させるようにしたものに比べて、形状が簡単になり、したがって機械加工を非常に容易に行うことができるので、安価に製作することができる。
【００２８】
また、油圧ポンプ１５をハウジング１２の外部に設置するようにしたので、従来のように、ハウジングをＴ字形状に構成して油圧ポンプを一体的に収容させたものに比べて、その保守点検を容易に行うことができるとともに、車体２における各構成機器の配置の自由度を大幅に向上させることができる。したがって、油圧ポンプの他に、当該油圧ポンプを駆動するエンジンの配置についても、設計の自由度が大きくなる。
【００２９】
ところで、上記実施の形態においては、本発明の車輪駆動部の構造をフォークリフトに適用した場合について説明したが、勿論、フォークリフト以外の産業車両にも適用し得るものである。
【００３０】
【発明の効果】
以上のように本発明の車輪駆動部構造によると、車輪駆動部を収容するハウジングを筒状に形成したので、従来のように、ハウジングをＴ字形状に構成したものに比べて、形状が簡単になり、したがって機械加工を非常に容易に行うことができるので、安価に製作することができる。
【００３１】
また、油圧ポンプをハウジングの外部に設置するようにしたので、従来のように、ハウジングをＴ字形状に構成して油圧ポンプを一体的に収容させたものに比べて、その保守点検を容易に行うことができるとともに、車体における各構成機器の配置の自由度を大幅に向上させることができる。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る車輪駆動部構造を有するフォークリフトの側面図である。
【図２】同フォークリフトの要部側面図である。
【図３】同車輪駆動部構造を示す要部切欠平面図である。
【図４】図３のＡ−Ａ矢視図である。
【図５】図４のＢ−Ｂ矢視図である。
【図６】同車輪駆動部構造における油圧モータの概略側面図である。
【図７】従来例の車輪駆動部構造を示す要部切欠平面図である。
【符号の説明】
１ フォークリフト
２ 車体
３ 前車輪
１１ 前輪駆動軸系
１２ 筒状ハウジング
１２ａ 凹状部
１２ｃ アクセスホール
１２ｄ 凹状部
１４ 油圧モータ
１４ａ 出力軸部
１４ｂ 連結板部
１５ 油圧ポンプ
１９ ブレーキ装置
２０ 制動解除手段
２１ ブレーキディスク部
２２ 油圧シリンダ部
２２ａ ピストン
２３ スプリング
２４ めねじ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wheel drive unit structure in an industrial vehicle such as a forklift.
[0002]
[Prior art]
Conventionally, in a forklift, as shown in FIG. 7, a housing 52 that accommodates a drive shaft system that rotates a wheel 51 has a T shape in plan view, and the wheel 51 is driven in the housing 52. And a hydraulic pump 54 for supplying hydraulic pressure to both the hydraulic motors 53 and 53 are accommodated.
[0003]
That is, the housing 52 includes a cylindrical main housing portion 52a in which a drive shaft portion 61 to which the wheels 51 are connected and a hydraulic motor 53 for rotating the drive shaft portion 61 are housed on both sides, and the main housing portion 52a. A sub-housing portion 52b that protrudes in a T-shape from the intermediate portion and accommodates the hydraulic pump 54 (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
German Patent Application No. 4405872
[Problems to be solved by the invention]
According to the wheel drive shaft structure, the housing 52 is formed in a T shape, and the drive shaft 61 and the hydraulic motor 53 connected to the wheel 51 and the hydraulic motors 53 and 53 are hydraulically connected to the housing 52. The housing 52 has a complicated shape, takes time for machining, increases the manufacturing cost, and the arrangement of the hydraulic pump 54 is inevitably limited. Therefore, for example, when designing a vehicle body such as a forklift, there is a problem that the degree of freedom is very narrow.
[0006]
Therefore, an object of the present invention is to provide a wheel drive unit structure that is low in manufacturing cost and has a high degree of freedom in designing a vehicle body.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the wheel drive unit structure according to claim 1 of the present invention has a cylindrical housing that is provided below the vehicle body and accommodates the wheel drive unit, and at both ends of the housing, A hydraulic motor for driving the wheel is arranged, and a wet brake device is provided at the other end of the hydraulic motor opposite to the one end to which the wheel of the output shaft is attached.
[0008]
According to a second aspect of the present invention, there is provided a wheel drive unit structure in which an access hole for operating a release means that can release the braking state of the wet brake device is formed in the housing of the structure according to the first aspect.
[0009]
According to a third aspect of the present invention, in the wheel drive unit structure according to the first or second aspect, the concave portion for the hydraulic pump that supplies hydraulic pressure to the hydraulic motor and is disposed in the vicinity of the housing is provided in the housing. Formed.
[0010]
Furthermore, the wheel drive unit structure according to claim 4 is configured such that when the hydraulic motor is attached to the housing in the structure according to any one of claims 1 to 3, a part of the hydraulic motor protrudes from the housing. A motor mounting base is formed on the housing.
[0011]
According to the above configuration, since the housing for housing the wheel drive unit is formed in a cylindrical shape, the shape is simpler than that in the conventional case where the housing is configured in a T shape, and therefore machining is easy. Can be manufactured inexpensively.
[0012]
In addition, since the hydraulic pump is installed outside the housing, it is easier to maintain and inspect as compared with the conventional case in which the housing is configured in a T-shape and the hydraulic pump is housed integrally. This can be performed and the degree of freedom of arrangement of each component device in the vehicle body can be greatly improved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the case where the wheel drive unit structure according to the embodiment of the present invention is applied to an industrial vehicle such as a forklift will be described with reference to FIGS.
[0014]
First, a schematic configuration of the forklift will be described with reference to FIGS. 1 and 2.
The forklift 1 is provided with front wheels (hereinafter referred to as front wheels) 3 on the left and right of the front portion of the vehicle body 2 and rear wheels (hereinafter referred to as rear wheels) 4 on the left and right of the rear portion. On the side, a column body (also referred to as a mast) 6 that has a fork portion 5 for holding a load and is extendable in the vertical direction is provided so as to be rotatable with respect to the axle of the front wheel 3. 6 is tilted forward by a predetermined angle within a vertical plane by a tilting cylinder device (also referred to as a tilting cylinder device) 7.
[0015]
The drive system in the forklift 1 is a front wheel drive system, and the rear wheels are, for example, non-driven and turned by a handle, but the gist of the present invention resides in the front wheel drive unit. In the following description, this part will be described.
[0016]
That is, as shown in FIGS. 3 to 5, a cylindrical housing 12 that accommodates a front wheel drive shaft system (front axle) 11 is attached to the front lower portion of the vehicle body 2 of the forklift 1 via an attachment member 13. .
[0017]
At both left and right end portions of the housing 12, hydraulic motors (also referred to as HST motors) 14 that are directly connected to the front wheels 3 and rotationally drive the front wheels 3 are disposed, and an intermediate portion (central portion) thereof. On the rear side surface, hydraulic pressure is supplied to both hydraulic motors 14 and a hydraulic pump 15 attached to the vehicle body at a position different from the housing 12 and close to the housing 12 can be disposed close to the rear side surface ( A concave portion 12a is formed which can be guided.
[0018]
As shown in FIG. 3, the hydraulic motor 14 is an example of an end portion of the housing 12 (a flange portion, which is an example of a motor mounting pedestal portion), by a flange portion 16 a protruding from an intermediate portion of the casing 16. ) It is attached to 12b with bolts 17. That is, the hydraulic motor 14 is attached to the housing 12 such that a part thereof protrudes from the housing 12.
[0019]
As shown in FIGS. 3 and 6, a connecting plate connected to a wheel, that is, a mounting disk portion 3 a of the front wheel 3 by bolts and nuts 18, at one end outside the output shaft portion 14 a of the hydraulic motor 14. A part 14b is formed, and the other end of the output shaft part 14a is provided with a brake device 19 that is released from the braking state by supplying hydraulic pressure. A brake releasing means 20 is provided which can manually release the braking state when 15 fails.
[0020]
That is, the brake device 19 includes a wet brake disc portion 21 attached to the other end portion of the output shaft portion 14a, and a hydraulic cylinder portion that causes the brake disc portion 21 to be in a brake state and a brake release state. 22] and a spring 23 for constantly pressing the piston 22a in the hydraulic cylinder portion 22 to bring the brake disc portion 21 into a braking state. When stopped, the brake is maintained by the urging force of the spring 23. During operation, the piston 22a is resisted by the urging force of the spring 23 by supplying hydraulic pressure to the hydraulic cylinder unit 22. Is moved to the released state.
[0021]
The brake release means 20 is formed at the central portion of the piston 22a, so that the brake release means 20 is detachably provided via a screw portion 24 and a hole portion 16b formed in the casing 16, and is engaged with the female screw portion 24. It is comprised from the detachable bolt (it is not shown, but is also called a release operating tool).
[0022]
For example, when the hydraulic pump 15 fails, the braking state is maintained by the urging force of the spring 23, but a bolt is inserted from the hole 16b formed in the casing 16 (see arrow a in FIG. 6). ) If the piston 22a is forced to move against the urging force of the spring 23 by engaging with the female thread portion 24 of the piston 22a and rotating, the braking state can be released.
[0023]
Therefore, an access hole (hole or notch) 12c for inserting a bolt as a release operating tool is formed in the housing 12 at a position corresponding to the hole 16b of the hydraulic motor 14 (see FIG. 3). ).
[0024]
An annular concave portion 12d is formed at the left and right positions of the housing 12, and an annular support member 25 connected to the column body 6 is rotatably provided on both concave portions 12d (FIG. 2). reference).
[0025]
In the above configuration, when the forklift 1 performs the cargo handling work, the hydraulic pressure supplied from the hydraulic pump 15 is supplied to the hydraulic motors 14 provided at both ends of the housing 12, and the front wheel 3 is rotated to travel. Also, the column body 6 supported by the housing 12 is also tilted by supplying hydraulic pressure from a cargo handling hydraulic pump (not shown) to the tilting cylinder device 7. Although not described, the column body 6 is expanded and contracted by the expansion and contraction cylinder device, and the fork unit 5 is moved up and down. Of course, as long as the hydraulic pressure is supplied, the brake device 19 provided in each hydraulic motor 14 is in a brake released state, and can travel freely.
[0026]
By the way, when the hydraulic pump 15 is stopped due to a failure, the supply of hydraulic pressure is stopped. Therefore, naturally, the brake device 19 is in a braking state and the forklift 1 cannot travel, but it is desired to release the braking state. In this case, a bolt, which is a release operating tool, is formed on the piston 22a in the casing 16 of the hydraulic motor 14 from the access hole 2c, so that it is screwed into the screw portion 24 to forcibly move the piston 22a of the hydraulic cylinder portion 22. You can do it.
[0027]
In this way, the housing 12 that accommodates the front wheel drive shaft system 11 is formed in a cylindrical shape, and only the front wheel drive hydraulic motor 14 is disposed at both ends thereof. Compared with a configuration in which a hydraulic motor and a hydraulic pump are accommodated in a letter shape, the shape is simple, and therefore machining can be performed very easily, so that it can be manufactured at low cost.
[0028]
In addition, since the hydraulic pump 15 is installed outside the housing 12, maintenance and inspection can be performed as compared with the conventional case in which the housing is configured in a T shape and the hydraulic pump is integrally accommodated. This can be easily performed, and the degree of freedom of arrangement of each component device in the vehicle body 2 can be greatly improved. Therefore, not only the hydraulic pump but also the arrangement of the engine that drives the hydraulic pump increases the degree of design freedom.
[0029]
By the way, in the said embodiment, although the case where the structure of the wheel drive part of this invention was applied to the forklift was demonstrated, of course, it can apply also to industrial vehicles other than a forklift.
[0030]
【The invention's effect】
As described above, according to the wheel drive unit structure of the present invention, since the housing for housing the wheel drive unit is formed in a cylindrical shape, the shape is simpler than that in the conventional case where the housing is configured in a T shape. Therefore, machining can be performed very easily, so that it can be manufactured at low cost.
[0031]
In addition, since the hydraulic pump is installed outside the housing, it is easier to maintain and inspect as compared with the conventional case in which the housing is configured in a T-shape and the hydraulic pump is housed integrally. In addition, the degree of freedom of arrangement of each component device in the vehicle body can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a side view of a forklift having a wheel drive unit structure according to an embodiment of the present invention.
FIG. 2 is a side view of a main part of the forklift.
FIG. 3 is a cutaway plan view of a main part showing the structure of the wheel drive unit.
4 is a view taken in the direction of arrows AA in FIG. 3;
5 is a BB arrow view of FIG. 4;
FIG. 6 is a schematic side view of a hydraulic motor in the wheel drive unit structure.
FIG. 7 is a cutaway plan view of a main part showing a conventional wheel drive unit structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Forklift 2 Car body 3 Front wheel 11 Front wheel drive shaft system 12 Cylindrical housing 12a Concave part 12c Access hole 12d Concave part 14 Hydraulic motor 14a Output shaft part 14b Connecting plate part 15 Hydraulic pump 19 Brake device 20 Brake release means 21 Brake disk part 22 Hydraulic cylinder 22a Piston 23 Spring 24 Female thread

Claims (4)

車体の下方に設けられて車輪駆動部を収容するハウジングを筒状に構成し、このハウジングの両端部に、車輪駆動用の油圧モータを配置するとともに、この油圧モータにおける出力軸の車輪が取り付けられる一端部とは反対側の他端部に、湿式ブレーキ装置を設けたことを特徴とする車輪駆動部構造。A housing that is provided below the vehicle body and accommodates the wheel drive unit is configured in a cylindrical shape, and a wheel drive hydraulic motor is disposed at both ends of the housing, and wheels of an output shaft of the hydraulic motor are attached. A wheel drive unit structure characterized in that a wet brake device is provided at the other end opposite to the one end. ハウジングに、湿式ブレーキ装置の制動状態を解除し得る解除手段を作動させるためのアクセスホールを形成したことを特徴とする請求項１に記載の車輪駆動部構造。The wheel drive unit structure according to claim 1, wherein an access hole for operating a release means capable of releasing the braking state of the wet brake device is formed in the housing. 油圧モータに油圧を供給するとともにハウジングの近傍に配置される油圧ポンプ用の凹状部を、当該ハウジングに形成したことを特徴とする請求項１または２に記載の車輪駆動部構造。The wheel drive unit structure according to claim 1 or 2, wherein a concave portion for a hydraulic pump that supplies hydraulic pressure to the hydraulic motor and is disposed in the vicinity of the housing is formed in the housing. ハウジングに油圧モータを取り付けた際に、当該油圧モータの一部がハウジングから突出するように、モータ取付用台座部をハウジングに形成したことを特徴とする請求項１乃至３のいずれかに記載の車輪駆動部構造。The motor mounting base is formed in the housing so that a part of the hydraulic motor protrudes from the housing when the hydraulic motor is mounted on the housing. Wheel drive part structure.
JP2003191547A 2003-07-04 2003-07-04 Wheel drive structure Expired - Fee Related JP4508561B2 (en)

Priority Applications (2)

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JP2003191547A JP4508561B2 (en) 2003-07-04 2003-07-04 Wheel drive structure
PCT/JP2004/009174 WO2005002896A1 (en) 2003-07-04 2004-06-30 Wheel drive section structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003191547A JP4508561B2 (en) 2003-07-04 2003-07-04 Wheel drive structure

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Publication number Priority date Publication date Assignee Title
DE102008032848A1 (en) * 2008-07-13 2010-01-14 Rögelberg Holding GmbH & Co. KG Truck and drive axle for a truck

Citations (5)

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JPS54155038U (en) * 1978-04-19 1979-10-27
JPH0735153U (en) * 1993-12-13 1995-06-27 東洋運搬機株式会社 Large forklift drive system
JPH0740239U (en) * 1993-12-28 1995-07-18 関東鉄工株式会社 Vehicle drive
JPH09221710A (en) * 1995-12-11 1997-08-26 Kawasaki Heavy Ind Ltd Drive device of roller compaction apparatus provided with tire rolling compaction wheel and tire roller
DE10034598A1 (en) * 2000-07-14 2002-01-24 Apis A S Wheel drive for motor vehicles with hydraulic motors and brakes has compact axle, connected to vehicle and carrying hydraulic motors, each with brake in front of it.

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Publication number Priority date Publication date Assignee Title
JP2002155504A (en) * 2000-11-17 2002-05-31 Sakai Heavy Ind Ltd Rolling compaction vehicle

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Publication number Priority date Publication date Assignee Title
JPS54155038U (en) * 1978-04-19 1979-10-27
JPH0735153U (en) * 1993-12-13 1995-06-27 東洋運搬機株式会社 Large forklift drive system
JPH0740239U (en) * 1993-12-28 1995-07-18 関東鉄工株式会社 Vehicle drive
JPH09221710A (en) * 1995-12-11 1997-08-26 Kawasaki Heavy Ind Ltd Drive device of roller compaction apparatus provided with tire rolling compaction wheel and tire roller
DE10034598A1 (en) * 2000-07-14 2002-01-24 Apis A S Wheel drive for motor vehicles with hydraulic motors and brakes has compact axle, connected to vehicle and carrying hydraulic motors, each with brake in front of it.

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