JP6016534B2

JP6016534B2 - Electric lift device and forklift using this electric lift device

Info

Publication number: JP6016534B2
Application number: JP2012192731A
Authority: JP
Inventors: 修司河上; 克彦串岡; 弘幸山田
Original assignee: ユニキャリア株式会社
Priority date: 2012-09-03
Filing date: 2012-09-03
Publication date: 2016-10-26
Anticipated expiration: 2032-09-03
Also published as: JP2014047057A

Description

本発明は、ねじ軸とローラゲージを備えた回転−直線運動変換機構からなる電動式リフト装置およびこの電動式リフト装置を使用したフォークリフトに関する。 The present invention relates to an electric lift device including a rotation-linear motion conversion mechanism provided with a screw shaft and a roller gauge, and a forklift using the electric lift device.

たとえば従来の電動式フォークリフトは、電動モータにより油圧ポンプを駆動して油圧を発生させ、この油圧をリフト装置の駆動源としており、油圧を油圧シリンダに送って荷役用フォークを昇降駆動している。 For example, in a conventional electric forklift, a hydraulic pump is driven by an electric motor to generate a hydraulic pressure, and this hydraulic pressure is used as a drive source of the lift device, and the hydraulic pressure is sent to a hydraulic cylinder to drive the lifting / lowering fork.

しかしながら、近年のエネルギの有効利用促進の観点から、油圧アクチュエータから電動アクチュエータ（回転−直線運動変換機構）を使用することが、たとえば特許文献１や特許文献２などに提案されている。 However, from the viewpoint of promoting effective use of energy in recent years, for example, Patent Document 1 and Patent Document 2 propose using an electric actuator (rotation-linear motion conversion mechanism) from a hydraulic actuator.

特許文献１には、電動アクチュエータであるリニアアクチュエータに、ねじ軸で相対する２つのフランク面をそれぞれ転動する周方向に３対で上下２組のローラを有するローラゲージ（変換駆動体）を具備している。また特許文献２には、荷役用フォークからローラゲージを介してねじ軸に加わる偏荷重を防止するための接触力均等化機構を設けることが提案されている。 In Patent Document 1, a linear actuator, which is an electric actuator, is provided with a roller gauge (conversion drive body) having two pairs of upper and lower rollers in the circumferential direction, each rolling two flanks facing each other with a screw shaft. doing. Patent Document 2 proposes to provide a contact force equalizing mechanism for preventing an unbalanced load applied to the screw shaft from a cargo handling fork via a roller gauge.

なお、特許文献１および特許文献２におけるリフト装置は、従来と同様に、外枠と内枠とを昇降自在に配置するとともに、内枠に荷役用フォークを支持するキャリッジを昇降自在に配置し、外枠とキャリッジとを連結したチェーンを、内枠の上部に設けたスプロケットホイールに巻回した巻き掛け伝動機構からなる倍速機構が採用されている。そしてローラゲージと内枠とが連結されて、リニアアクチュエータのねじ軸を回転駆動することにより、内枠を昇降駆動し、スプロケットホイールを介してキャリッジを倍速で昇降させることができる。 In addition, the lift device in Patent Document 1 and Patent Document 2 arranges the outer frame and the inner frame so that they can be raised and lowered, and arranges the carriage that supports the cargo handling fork on the inner frame so that they can be raised and lowered. A double speed mechanism comprising a winding transmission mechanism in which a chain connecting an outer frame and a carriage is wound around a sprocket wheel provided on the upper portion of the inner frame is employed. Then, the roller gauge and the inner frame are connected, and the screw shaft of the linear actuator is rotationally driven, whereby the inner frame can be driven up and down, and the carriage can be moved up and down at a double speed via the sprocket wheel.

ＷＯ２０１０／１５０７３２Ａ１（図１２）WO2010 / 150732A1 (FIG. 12) 特開２０１１−６９４４９（図１２）JP2011-69449A (FIG. 12)

ところで、上記従来構造では、荷搭載状態で車両が路面段差を乗り越える際に、ローラゲージに上方および下方への衝撃力がそれぞれ発生する。また、ねじ軸を回転させてローラゲージを上昇させ、荷を載せた荷役用フォークを持ち上げる際に、ローラゲージに上方への衝撃力が発生する。またねじ軸を回転させてローラゲージを上昇させ、着地された荷を、荷役用フォークにより持ち上げる際に、ローラゲージに下方への衝撃力が発生する。これらの衝撃力は、ローラケージやねじ軸に負荷を与えて、その寿命を短縮するおそれがあった。 By the way, in the above conventional structure, when the vehicle gets over the road surface step in the loaded state, an upward and downward impact force is generated on the roller gauge. Further, when the screw shaft is rotated to raise the roller gauge and lift the cargo handling fork loaded with a load, an upward impact force is generated on the roller gauge. Further, when the screw shaft is rotated to raise the roller gauge and the landed load is lifted by the handling fork, a downward impact force is generated on the roller gauge. These impact forces may impose a load on the roller cage or screw shaft and shorten its life.

本発明は、上記問題点を解決して、回転−直線運動する変換駆動体に加わる衝撃力を吸収して緩衝し、リフト装置への負荷を軽減することができる電動式リフト装置およびこの電動式リフト装置を用いたフォークリフトを提供することを目的とする。 The present invention solves the above-described problems, absorbs and cushions the impact force applied to the conversion drive body that rotates and linearly moves, and reduces the load on the lift device and the electric lift device. An object of the present invention is to provide a forklift using a lift device.

請求項１記載の発明は、
昇降用ガイド部材に沿って配置されたリフト用ねじ軸と、リフト用ねじ軸を回転駆動するリフト用電動モータと、前記リフト用ねじ軸に外嵌されて昇降駆動される変換駆動体とを具備し、この変換駆動体により昇降用ガイド部材に沿って荷役部材を昇降駆動可能な電動式リフト装置であって、
変換駆動体に支持された駆動部材と、荷役部材に連動連結された受動部材と、前記駆動部材および前記受動部材を連結する連結部に設けられて、リフト用ねじ軸から変換駆動体を介して前記駆動部材に加わる上方への衝撃力と、荷役部材から前記受動部材に加わる下方への衝撃とをそれぞれ緩衝可能な緩衝装置とを備え、
前記緩衝装置は、
上位の前記駆動部材と下位の前記受動部材とを互いに接して離間可能に配置するとともに、上位の前記駆動部材を下位の前記受動部材側に付勢する上弾性部材と、下位の前記受動部材を上位の前記駆動部材側に付勢する下弾性部材とを設けたものである。 The invention described in claim 1
A lift screw shaft disposed along the lifting guide member, a lift electric motor that rotationally drives the lift screw shaft, and a conversion drive body that is externally fitted to the lift screw shaft and driven to move up and down. An electric lift device capable of driving the cargo handling member up and down along the lifting guide member by the conversion driving body,
A drive member supported by the conversion drive body, a passive member interlocked with the cargo handling member, and a connecting portion that connects the drive member and the passive member are provided from the lift screw shaft via the conversion drive body. A shock absorber capable of buffering an upward impact force applied to the drive member and a downward impact applied to the passive member from the cargo handling member,
The shock absorber is
The upper drive member and the lower passive member are arranged in contact with each other and can be separated from each other, and an upper elastic member that biases the upper drive member toward the lower passive member, and the lower passive member. A lower elastic member that biases toward the upper drive member side is provided .

請求項２記載の発明は、
立設された外枠と、当該外枠に沿って昇降自在に案内される内枠と、当該内枠に昇降自在に案内されて荷役部材が設けられた昇降移動体と、一端が前記外枠に連結されるとともに他端が前記昇降移動体に連結された索体、および前記内枠に設けられたて前記索体の中間部を巻回する転向用輪体とを有する巻き掛け伝動機構と、前記外枠に沿って配置されたリフト用ねじ軸と、当該リフト用ねじ軸を回転駆動するリフト用電動モータと、前記リフト用ねじ軸に外嵌されて昇降駆動される変換駆動体と、を具備した電動式リフト装置であって、
変換駆動体に支持された駆動部材と、内枠に取り付けられた受動部材との連結部に、リフト用ねじ軸から変換駆動体を介して前記駆動部材に加わる上方への衝撃力と、荷役部材から昇降移動体、巻き掛け伝動機構および内枠を介して前記受動部材に加わる下方への衝撃力と、をそれぞれ緩衝可能な緩衝装置を設け、
前記緩衝装置は、
上位の前記駆動部材と下位の前記受動部材とを互いに接して離間可能に配置するとともに、上位の前記駆動部材を下位の前記受動部材側に付勢する上弾性部材と、下位の前記受動部材を上位の前記駆動部材側に付勢する下弾性部材とを設けたものである。 The invention according to claim 2
An outer frame that is erected, an inner frame that is guided so as to be movable up and down along the outer frame, a lifting and lowering body that is guided so as to be movable up and down along the inner frame and that is provided with a cargo handling member, and one end of which is the outer frame And a winding transmission mechanism having a cable body connected to the lifting and lowering body and the other end connected to the elevating and moving body and a turning ring body wound around an intermediate portion of the cable body provided on the inner frame. A lift screw shaft disposed along the outer frame, a lift electric motor that rotationally drives the lift screw shaft, a conversion drive body that is externally fitted to the lift screw shaft and is driven up and down, An electric lift device comprising:
An upward impact force applied to the drive member from the screw shaft for lift through the conversion drive body to the connecting portion of the drive member supported by the conversion drive body and the passive member attached to the inner frame, and a cargo handling member A shock absorber capable of buffering the downward impact force applied to the passive member via the lifting and lowering moving body, the winding transmission mechanism and the inner frame,
The shock absorber is
The upper drive member and the lower passive member are arranged in contact with each other and can be separated from each other, and an upper elastic member that biases the upper drive member toward the lower passive member, and the lower passive member. A lower elastic member that biases toward the upper drive member side is provided .

請求項３記載の発明は、
走行体に立設された外枠と、当該外枠に沿って昇降自在に案内される内枠と、当該内枠に昇降自在に案内されて荷役用フォークが設けられたキャリッジと、一端が前記外枠に連結されるとともに、他端が前記キャリッジに連結されたリフト用チェーンおよび前記内枠に設けられて前記リフト用チェーンの中間部を巻回する転向用輪体とを有する巻き掛け伝動機構と、前記外枠に沿って立設されたリフト用ねじ軸と、当該リフト用ねじ軸を回転駆動するリフト用電動モータと、前記リフト用ねじ軸に外嵌されて昇降駆動される変換駆動体とを具備した電動式リフト装置を備えたフォークリフトであって、
前記変換駆動体に支持された上位の駆動部材と、前記内枠に取り付けられた下位の受動部材とを連結する連結部に、リフト用ねじ軸から変換駆動体を介して前記駆動部材に加わる上方への衝撃力と、荷役用フォークから電動式リフト装置を介して前記受動部材に加わる下方への衝撃力とをそれぞれ緩衝可能な緩衝装置を設け、
前記緩衝装置は、
上位の前記駆動部材と下位の前記受動部材とを互いに接して離間可能に配置するとともに、上位の前記駆動部材を下位の前記受動部材側に付勢する上弾性部材と、下位の前記受動部材を上位の前記駆動部材側に付勢する下弾性部材とを設けたものである。 The invention described in claim 3
An outer frame erected on the traveling body, an inner frame guided so as to be movable up and down along the outer frame, a carriage provided so as to be movable up and down along the inner frame and provided with a cargo fork, and one end of the carriage A winding transmission mechanism having a lifting chain connected to the outer frame and having the other end connected to the carriage and a turning ring provided on the inner frame and winding an intermediate portion of the lifting chain. A lift screw shaft erected along the outer frame, a lift electric motor that rotationally drives the lift screw shaft, and a conversion drive body that is externally fitted to the lift screw shaft and driven to move up and down A forklift equipped with an electric lift device comprising:
An upper portion that is applied to the drive member from the lift screw shaft via the conversion drive member to a connecting portion that connects the upper drive member supported by the conversion drive member and the lower passive member attached to the inner frame. Shock absorbers capable of buffering the impact force on the lower side and the downward impact force applied to the passive member from the cargo handling fork via the electric lift device,
The shock absorber is
The upper drive member and the lower passive member are arranged in contact with each other and can be separated from each other, and an upper elastic member that biases the upper drive member toward the lower passive member, and the lower passive member. A lower elastic member that biases toward the upper drive member side is provided .

請求項４記載の発明は、
走行体に立設された外枠と、当該外枠に沿って昇降自在に案内される内枠と、当該内枠に昇降自在に案内されて荷役用フォークが設けられたキャリッジと、一端が前記外枠に連結されるとともに、他端が前記キャリッジに連結されたリフト用チェーンおよび前記内枠に設けられて前記リフト用チェーンの中間部を巻回する転向用輪体とを有する巻き掛け伝動機構と、前記外枠に沿って立設されたリフト用ねじ軸と、当該リフト用ねじ軸を回転駆動するリフト用電動モータと、前記リフト用ねじ軸に外嵌されて昇降駆動される変換駆動体とを具備した電動式リフト装置を備えたフォークリフトであって、
前記変換駆動体に支持された上位の駆動部材と、前記内枠に取り付けられた下位の受動部材とを連結する連結部に、リフト用ねじ軸から変換駆動体を介して前記駆動部材に加わる上方への衝撃力と、荷役用フォークから電動式リフト装置を介して前記受動部材に加わる下方への衝撃力とをそれぞれ緩衝可能な緩衝装置を設け、
前記緩衝装置は、
上位の前記駆動部材と下位の前記受動部材とを、互いに接して離間可能に配置するとともに、前記駆動部材および前記受動部材に互いに連通する貫通穴を形成し、
当該貫通穴に遊嵌された規制軸の上端部に上端規制部を設けるとともに、下端部に下端規制部を設け、
前記上端規制部と前記駆動部材との間に、前記規制軸に外嵌された上弾性部材を介装するとともに、前記下端規制部と前記受動部材との間に前記規制軸に外嵌された下弾性部材を介装したものである。 The invention according to claim 4
An outer frame erected on the traveling body, an inner frame guided so as to be movable up and down along the outer frame, a carriage provided so as to be movable up and down along the inner frame and provided with a cargo fork, and one end of the carriage A winding transmission mechanism having a lifting chain connected to the outer frame and having the other end connected to the carriage and a turning ring provided on the inner frame and winding an intermediate portion of the lifting chain. A lift screw shaft erected along the outer frame, a lift electric motor that rotationally drives the lift screw shaft, and a conversion drive body that is externally fitted to the lift screw shaft and driven to move up and down A forklift equipped with an electric lift device comprising:
An upper portion that is applied to the drive member from the lift screw shaft via the conversion drive member to a connecting portion that connects the upper drive member supported by the conversion drive member and the lower passive member attached to the inner frame. Shock absorbers capable of buffering the impact force on the lower side and the downward impact force applied to the passive member from the cargo handling fork via the electric lift device,
The shock absorber is
The upper drive member and the lower passive member are arranged so as to be in contact with each other and can be separated from each other, and a through hole communicating with the drive member and the passive member is formed.
While providing an upper end restriction portion at the upper end portion of the restriction shaft loosely fitted in the through hole, a lower end restriction portion is provided at the lower end portion,
An upper elastic member externally fitted to the restriction shaft is interposed between the upper end restriction portion and the drive member, and is fitted to the restriction shaft between the lower end restriction portion and the passive member. A lower elastic member is interposed .

請求項１記載の発明によれば、リフト用電動モータによりリフト用ねじ軸を回転駆動し、変換駆動体により駆動部材および受動部材を介して荷役部材を上昇させる。そして、荷が支持された荷役部材を起動して上昇させる時に、荷と荷役部材の荷重により、駆動部材および変換駆動体に上方への衝撃力が発生するが、緩衝装置によりこの衝撃力を吸収して効果的に緩衝することができる。さらに、荷役部材を上昇させて、着地された荷を持ち上げる時に、荷と荷役部材の荷重により、受動部材に下方への衝撃力が発生する。緩衝装置によりこの衝撃力を吸収して効果的に緩衝することができる。このように載荷による衝撃力を緩衝できることで、変換駆動体やリフト用ねじ軸などの磨耗や変形、損傷を未然に防止することができる。また、荷役部材が片持ち状に支持されて偏りのある衝撃力が加わるような構造であっても、磨耗や変形、損傷防止効果が高い。さらに緩衝装置がリフト用ねじ軸に介在されることがないので、リフト用ねじ軸の昇降ストロークを削減することもない。
また緩衝装置により、受動部材から離間する駆動部材への上方への衝撃力を、上弾性部材が圧縮されることにより吸収し、駆動部材から離間する受動部材への下方への衝撃力を、下弾性部材が圧縮されることにより吸収し、駆動部材および受動部材に加わる衝撃力を効果的に緩衝することができる。 According to the first aspect of the present invention, the lift screw shaft is rotationally driven by the lift electric motor, and the cargo handling member is raised by the conversion drive member via the drive member and the passive member. When the cargo handling member that supports the load is activated and raised, an upward impact force is generated in the drive member and the conversion drive body due to the load of the load and the cargo handling member, but this impact force is absorbed by the shock absorber. And can be effectively buffered. Further, when the cargo handling member is raised to lift the landed load, a downward impact force is generated on the passive member due to the load of the cargo and the cargo handling member. This shock force can be absorbed and effectively buffered by the shock absorber. Since the impact force due to loading can be buffered in this way, it is possible to prevent wear, deformation, and damage of the conversion drive body and the lift screw shaft. Further, even when the cargo handling member is supported in a cantilevered manner and a biased impact force is applied, the effect of preventing wear, deformation, and damage is high. Further, since the shock absorber is not interposed in the lift screw shaft, the lifting stroke of the lift screw shaft is not reduced.
Also, the shock absorber absorbs the upward impact force on the drive member that is separated from the passive member by compressing the upper elastic member, and reduces the downward impact force on the passive member that is separated from the drive member. The elastic member is absorbed by being compressed, and the impact force applied to the driving member and the passive member can be effectively buffered.

請求項２記載の発明によれば、リフト用電動モータを起動してリフト用ねじ軸を回転駆動し、変換駆動体により駆動部材および受動部材を介して内枠を昇降させ、巻き掛け伝動機構を介して昇降移動体および荷役部材を上昇させる。そして、荷が支持された荷役部材を起動して上昇させる時に、荷と荷役部材の荷重により、駆動部材および変換駆動体に上方への衝撃力が発生するが、緩衝装置によりこの衝撃力を吸収して効果的に緩衝することができる。さらに、荷役部材を上昇させ、着地された荷を持ち上げる時に、荷と荷役部材の荷重により、受動部材に下方への衝撃力が発生するが、緩衝装置によりこの衝撃力を吸収して効果的に緩衝することができる。このように衝撃力を緩衝できることで、変換駆動体やリフト用ねじ軸などの磨耗や変形、損傷を未然に防止することができる。また、荷役部材が片持ち状に支持されて、変換駆動体に偏りのある衝撃力が加わるような構造であっても、磨耗や変形、損傷防止効果が高い。さらに緩衝装置がリフト用ねじ軸に介在されることがないので、リフト用ねじ軸の昇降ストロークを削減することもない。 According to the second aspect of the invention, the lift electric motor is activated to rotationally drive the lift screw shaft, and the inner frame is moved up and down by the conversion drive member via the drive member and the passive member, so that the winding transmission mechanism is The lifting / lowering moving body and the cargo handling member are lifted through. When the cargo handling member that supports the load is activated and raised, an upward impact force is generated in the drive member and the conversion drive body due to the load of the load and the cargo handling member, but this impact force is absorbed by the shock absorber. And can be effectively buffered. Furthermore, when the cargo handling member is lifted and the landed load is lifted, a downward impact force is generated on the passive member due to the load of the load and the cargo handling member, but the impact force is effectively absorbed by the shock absorber. Can be buffered. Since the impact force can be buffered in this way, it is possible to prevent wear, deformation, and damage of the conversion driver and the lift screw shaft. Further, even when the cargo handling member is supported in a cantilever manner and a biased impact force is applied to the conversion drive body, the effect of preventing wear, deformation, and damage is high. Further, since the shock absorber is not interposed in the lift screw shaft, the lifting stroke of the lift screw shaft is not reduced.

また緩衝装置により、受動部材から離間する駆動部材への上方への衝撃力を、上弾性部材が圧縮されることにより吸収し、駆動部材から離間する受動部材への下方への衝撃力を、下弾性部材が圧縮されることにより吸収し、駆動部材および受動部材に加わる衝撃力を効果的に緩衝することができる。 Also , the shock absorber absorbs the upward impact force on the drive member that is separated from the passive member by compressing the upper elastic member, and reduces the downward impact force on the passive member that is separated from the drive member. The elastic member is absorbed by being compressed, and the impact force applied to the driving member and the passive member can be effectively buffered.

請求項３記載の発明によれば、リフト用電動モータを起動してリフト用ねじ軸を回転駆動し、変換駆動体により駆動部材および受動部材を介して内枠を昇降させ、巻き掛け伝動機構を介してキャリッジおよび荷役用フォークを昇降させる。そして、荷が支持された荷役部材を上昇させる起動時や走行中に段差を乗り越える時に、荷と荷役部材の荷重により、変換駆動体から駆動部材に上方への衝撃力が発生する。この衝撃力を緩衝装置により吸収して、効果的に緩衝することができる。さらに、リフト用ねじ軸を回転駆動して荷役部材を上昇させ、着地された荷を持ち上げる時や走行中に段差を乗り越える時に、荷と荷役部材の荷重により、受動部材に下方への衝撃力が発生する。この衝撃力を緩衝装置により吸収し、効果的に緩衝することができる。このようにリフト駆動時や走行時に生じる衝撃力を緩衝できることで、変換駆動体やリフト用ねじ軸などの磨耗や変形、損傷を未然に防止することができる。また、荷役部材が片持ち状に支持されて、変換駆動体に偏りのある衝撃力が加わるような構造であっても、磨耗や変形、損傷防止効果が高い。さらに緩衝装置がリフト用ねじ軸に介在されることがないので、リフト用ねじ軸の昇降ストロークを削減することもない。 According to the third aspect of the present invention, the lift electric motor is started to rotationally drive the lift screw shaft, and the inner frame is moved up and down by the conversion drive member via the drive member and the passive member, so that the winding transmission mechanism is The carriage and the cargo handling fork are moved up and down. Further, when the load handling member that supports the load is raised or when the vehicle climbs over a step during traveling, an upward impact force is generated from the conversion drive body to the drive member due to the load of the load and the load handling member. This impact force is absorbed by the shock absorber and can be effectively buffered. In addition, the lifting screw shaft is driven to rotate to raise the cargo handling member, and when the landing load is lifted or over a level difference during traveling, the load of the cargo and the cargo handling member causes a downward impact force on the passive member. Occur. This impact force is absorbed by the shock absorber and can be effectively buffered. Since the impact force generated during lift driving or traveling can be buffered in this way, it is possible to prevent wear, deformation, and damage to the conversion drive body and the lift screw shaft. Further, even when the cargo handling member is supported in a cantilever manner and a biased impact force is applied to the conversion drive body, the effect of preventing wear, deformation, and damage is high. Further, since the shock absorber is not interposed in the lift screw shaft, the lifting stroke of the lift screw shaft is not reduced.

また緩衝装置により、受動部材から駆動部材が上方に離間する方向の衝撃力を、上弾性部材が圧縮されることにより吸収し、受動部材が駆動部材から下方に離間する方向の衝撃力を、下弾性部材が圧縮されることにより吸収する。これにより、駆動部材および受動部材に加わる衝撃力を効果的に緩衝することができる。 The shock absorber absorbs the impact force in the direction in which the drive member is separated upward from the passive member by compressing the upper elastic member, and reduces the impact force in the direction in which the passive member is separated downward from the drive member. Absorbs when the elastic member is compressed. Thereby, the impact force applied to the drive member and the passive member can be effectively buffered.

請求項６記載の発明によれば、リフト用電動モータを起動してリフト用ねじ軸を回転駆動し、変換駆動体により駆動部材および受動部材を介して内枠を昇降させ、巻き掛け伝動機構を介してキャリッジおよび荷役用フォークを昇降させる。そして、荷が支持された荷役部材を上昇させる起動時や走行中に段差を乗り越える時に、荷と荷役部材の荷重により、変換駆動体から駆動部材に上方への衝撃力が発生する。この衝撃力を緩衝装置により吸収して、効果的に緩衝することができる。さらに、リフト用ねじ軸を回転駆動して荷役部材を上昇させ、着地された荷を持ち上げる時や走行中に段差を乗り越える時に、荷と荷役部材の荷重により、受動部材に下方への衝撃力が発生する。この衝撃力を緩衝装置により吸収し、効果的に緩衝することができる。このようにリフト駆動時や走行時に生じる衝撃力を緩衝できることで、変換駆動体やリフト用ねじ軸などの磨耗や変形、損傷を未然に防止することができる。また、荷役部材が片持ち状に支持されて、変換駆動体に偏りのある衝撃力が加わるような構造であっても、磨耗や変形、損傷防止効果が高い。さらに緩衝装置がリフト用ねじ軸に介在されることがないので、リフト用ねじ軸の昇降ストロークを削減することもない。
また緩衝装置により、貫通穴に遊嵌された規制軸に、駆動部材を受動部材側に押し付ける上弾性部材と、受動部材を駆動部材側に押し付ける下弾性部材とを規制して設けたので、上弾性部材と下弾性部材とを安定して支持でき、駆動部材に加わる上方への衝撃と、受動部材に加わる下方への衝撃とを効果的に吸収して緩衝することができ、リフト装置を保護することができる。 According to the sixth aspect of the present invention, the lift electric motor is activated to rotationally drive the lift screw shaft, and the inner frame is moved up and down through the drive member and the passive member by the conversion drive body, so that the winding transmission mechanism is The carriage and the cargo handling fork are moved up and down. Further, when the load handling member that supports the load is raised or when the vehicle climbs over a step during traveling, an upward impact force is generated from the conversion drive body to the drive member due to the load of the load and the load handling member. This impact force is absorbed by the shock absorber and can be effectively buffered. In addition, the lifting screw shaft is driven to rotate to raise the cargo handling member, and when the landing load is lifted or over a level difference during traveling, the load of the cargo and the cargo handling member causes a downward impact force on the passive member. Occur. This impact force is absorbed by the shock absorber and can be effectively buffered. Since the impact force generated during lift driving or traveling can be buffered in this way, it is possible to prevent wear, deformation, and damage to the conversion drive body and the lift screw shaft. Further, even when the cargo handling member is supported in a cantilever manner and a biased impact force is applied to the conversion drive body, the effect of preventing wear, deformation, and damage is high. Further, since the shock absorber is not interposed in the lift screw shaft, the lifting stroke of the lift screw shaft is not reduced.
Further, the upper elastic member that presses the drive member toward the passive member side and the lower elastic member that presses the passive member toward the drive member side are regulated and provided on the restriction shaft loosely fitted in the through hole by the shock absorber. The elastic member and the lower elastic member can be stably supported, and the upward impact applied to the drive member and the downward impact applied to the passive member can be effectively absorbed and buffered to protect the lift device. can do.

本発明に係る電動式リフト装置を搭載したリーチ式フォークリフトの実施例１を示し、荷役装置の後方斜視図である。1 is a rear perspective view of a cargo handling device according to a first embodiment of a reach-type forklift equipped with an electric lift device according to the present invention. リーチ式フォークリフトを示す全体側面図である。It is a whole side view showing a reach type forklift. （ａ）〜（ｃ）は、電動式リフト装置を示し、（ａ）は背面視の部分断面図、（ｂ）は上撓み吸収部の拡大縦断面図、（ｃ）は下撓み吸収部の拡大縦断面図である。(A)-(c) shows an electric lift device, (a) is a partial sectional view in rear view, (b) is an enlarged vertical sectional view of an upper deflection absorbing portion, and (c) is a lower deflection absorbing portion. It is an enlarged vertical sectional view. 電動式リフト装置の平面視の断面図である。It is sectional drawing of planar view of an electric lift apparatus. 電動式リフト装置の平面図である。It is a top view of an electric lift device. 接触力均等化部材を示す斜視図である。It is a perspective view which shows a contact force equalization member. ローラゲージを示す縦断面図である。It is a longitudinal cross-sectional view which shows a roller gauge. （ａ）（ｂ）は、電動式リフト装置を搭載した簡易式の可動リフターを示し、（ａ）は側面図、（ｂ）は背面図である。(A) and (b) show the simple movable lifter carrying an electric lift device, (a) is a side view, and (b) is a back view. （ａ）（ｂ）は、緩衝装置の変形例を示し、（ａ）は正面図、（ｂ）は側面図である。(A) and (b) show the modification of a buffer, (a) is a front view and (b) is a side view.

［実施例１］
以下、本発明に係る電動式リフト装置を搭載したリーチ式フォークリフトの実施例を図１〜図７に基づいて説明する。 [Example 1]
Hereinafter, an embodiment of a reach forklift equipped with an electric lift device according to the present invention will be described with reference to FIGS.

このリーチ式フォークリフトは、図２に示すように、運転席１７やヘッドガード１８を有する車体（走行体）１１を具備し、車体１１の底部で、左側部に配置されたドライブホイール１２と、右側部に配置されて回転自在なキャスタホイール１３と、車体１１から前方に伸びる左右一対のアウトリガー１４にそれぞれ回転自在に支持された左右のトレールホイール１５により走行自在に構成され、前記ドライブホイール１２により車体１１が走行駆動および操舵される。さらにアウトリガー１４間に、本発明に係るリフト装置２３を有する荷役装置２１が出退自在に配置され、荷役装置２１に荷役用フォーク（荷役部材）１６が設けられている。 As shown in FIG. 2, the reach forklift includes a vehicle body (traveling body) 11 having a driver's seat 17 and a head guard 18, and a drive wheel 12 disposed on the left side at the bottom of the vehicle body 11 and a right side. The caster wheel 13 is disposed in a rotatable manner, and the left and right trail wheels 15 are rotatably supported by a pair of left and right outriggers 14 extending forward from the vehicle body 11. 11 is driven and steered. Further, a cargo handling device 21 having a lift device 23 according to the present invention is disposed between the outriggers 14 so as to be freely retractable, and a cargo handling fork (a cargo handling member) 16 is provided in the cargo handling device 21.

図１に示すように、荷役装置２１は、基台部２２と、この基台部２２に立設されたリフト装置２３とを具備し、基台部２２に、アウトリガー１４の内面に形成されたガイドレール１４ａに案内される左右一対で前後２組の出退ホイール２２ａが回転自在に支持されている。そして車体１１に、荷役装置２１をアウトリガー１４に沿って所定範囲で出退させる電動式のリーチ用ジャッキ（図示せず）が設けられている。 As shown in FIG. 1, the cargo handling device 21 includes a base portion 22 and a lift device 23 erected on the base portion 22, and is formed on the inner surface of the outrigger 14 on the base portion 22. A pair of left and right front and rear wheels 22a guided by the guide rail 14a are rotatably supported. The vehicle body 11 is provided with an electric reach jack (not shown) for moving the cargo handling device 21 in and out of the predetermined range along the outrigger 14.

図３〜図５に示すように、このリフト装置２３は、昇降ガイド部材２３Ａとリフト駆動部２３Ｂとを具備している。昇降ガイド部材２３Ａは、基台部２２に立設された門形状の外枠２４と、この外枠２４のポスト部内に複数の内枠案内ローラ２６Ａ，２６Ｂを介して昇降自在に案内される内枠２５と、この内枠２５のポスト部内にキャリッジ案内ローラ２７Ａを介して昇降自在に案内されるキャリッジ（昇降移動体）２７とが設けられている。リフト駆動部２３Ｂは、内枠２５の上部に設けられた転向スプロケットホイール２９と、一端が外枠２４に取り付けられたチェーン連結部（連結部）２４ａに連結され、他端がキャリッジ２７のチェーンブラケット（連結部）２７ａに連結されるリフト用チェーン（索体）２８と、を有する巻き掛け式伝動機構３０が設けられている。２９ａは、キャリッジ２７側に駆動電源を送るためのケーブルシーブである。この巻き掛け式伝動機構３０では、リフト用チェーン２８が前記転向スプロケットホイール（転向用輪体）２９に巻回されることにより、内枠２５の昇降ストロークに対して２倍のストローク（または速度）でキャリッジ２７を昇降させる倍速機構が構成されている。
また外枠２４のポスト部の後部に沿って配置されたリフト用ねじ軸３１と、リフト用ねじ軸３１に昇降自在に外嵌されてフランク面を転動する複数（たとえば周方向等角度ごとに３個１組で上下２組）のローラを有する回転−直線運動変換駆動体であるローラゲージ（変換駆動体）３２と、ギヤ機構３３を介してリフト用ねじ軸３１を回転駆動する減速機３４ａ付リフト用電動モータ３４とを具備している。また、荷役用フォーク１６による偏荷重に対応するために、左右のローラゲージ３２上でリフト用ねじ軸３１に外嵌された接触力均等化部材３５がそれぞれ配置されており、左右の接触力均等化部材３５上に駆動ビーム材３６が掛け渡されている。この駆動ビーム材３６は、左右端縁にそれぞれ開口されたＵ形の切り欠き部３６ａがそれぞれ形成され、これら切り欠き部３６ａにリフト用ねじ軸３１に遊嵌されて、接触力均等化部材３５上に載置されている。 As shown in FIGS. 3 to 5, the lift device 23 includes a lift guide member 23 </ b> A and a lift drive unit 23 </ b> B. The elevating guide member 23A is an inner frame which is guided up and down freely through a gate-shaped outer frame 24 standing on the base 22 and a plurality of inner frame guide rollers 26A and 26B in a post portion of the outer frame 24. A frame 25 and a carriage (lifting / lowering body) 27 guided in a freely moving manner through a carriage guide roller 27A are provided in a post portion of the inner frame 25. The lift drive unit 23 </ b> B is connected to a turning sprocket wheel 29 provided on the upper portion of the inner frame 25, one end connected to a chain connecting unit (connecting unit) 24 a attached to the outer frame 24, and the other end connected to a chain bracket of the carriage 27. A winding type transmission mechanism 30 having a lift chain (cord) 28 connected to the (connecting portion) 27a is provided. Reference numeral 29a denotes a cable sheave for sending drive power to the carriage 27 side. In this winding transmission mechanism 30, the lift chain 28 is wound around the turning sprocket wheel (turning wheel body) 29, so that the stroke (or speed) is twice as high as the lifting stroke of the inner frame 25. Thus, a double speed mechanism for raising and lowering the carriage 27 is configured.
Also, a lift screw shaft 31 disposed along the rear portion of the post portion of the outer frame 24, and a plurality of (for example, circumferentially equiangular angles) that are externally fitted to the lift screw shaft 31 and roll on the flank surface. A roller gauge (conversion drive body) 32 that is a rotation-linear motion conversion drive body having three rollers (two sets in the upper and lower pairs), and a speed reducer 34a that rotationally drives the lift screw shaft 31 via a gear mechanism 33. And an electric motor 34 for lifting. Further, in order to cope with the uneven load caused by the cargo handling fork 16, contact force equalizing members 35 fitted on the lift screw shafts 31 on the left and right roller gauges 32 are respectively arranged, and the left and right contact force equalization is provided. A drive beam material 36 is stretched over the activating member 35. The drive beam member 36 is formed with U-shaped cutouts 36a that are respectively opened at the left and right edges, and is loosely fitted to the lift screw shaft 31 in the cutouts 36a, so that the contact force equalizing member 35 is formed. It is placed on top.

ローラゲージ３２は、図７に示すように、ゲージ本体３２ｃに、上方からの負荷に対して下方のフランク面を転動自在に支持する３個の支持ローラ３２ａが一定角度ごとに配置され、上方のフランク面を転動自在に支持する３個のガイドローラ３２ｂが一定角度ごとに配置されている。 As shown in FIG. 7, in the roller gauge 32, three support rollers 32a that rotatably support the lower flank surface with respect to a load from above are arranged on the gauge body 32c at every predetermined angle. The three guide rollers 32b that rotatably support the flank surface are arranged at fixed angles.

また接触力均等化部材３５は、図８に示すように、中間リング体３５ａの底面で、軸心に垂直で直交交差する方向に凹部を介して半円形断面の下部滑動部材３５ｂがそれぞれ回動自在に配置されている。また中間リング体３５ａの天面で、軸心に略垂直で下部滑動部材３５ｂに交差する対称位置に凹部を介して半円形断面の上部滑動部材３５ｃがそれぞれ回動自在に配置されている。 In addition, as shown in FIG. 8, the contact force equalizing member 35 is rotated by a lower sliding member 35b having a semicircular cross section through a recess in a direction perpendicular to the axis and orthogonal to the bottom surface of the intermediate ring body 35a. Arranged freely. Further, on the top surface of the intermediate ring body 35a, an upper sliding member 35c having a semicircular cross section is rotatably disposed via a recess at a symmetrical position substantially perpendicular to the axis and intersecting the lower sliding member 35b.

さらに、荷役用フォーク１６を片持ち支持するために発生する偏荷重によるリフト用ねじ軸３１の撓みを吸収するために、図３（ａ）に示すように、リフト用ねじ軸３１の上端部に、上撓み吸収部３７が設けられ、リフト用ねじ軸３１の下端部に下撓み吸収部３９が設けられている。 Further, in order to absorb the deflection of the lift screw shaft 31 due to the unbalanced load generated for cantilever support of the cargo handling fork 16, as shown in FIG. An upper deflection absorbing portion 37 is provided, and a lower deflection absorbing portion 39 is provided at the lower end portion of the lift screw shaft 31.

前記上撓み吸収部３７は、図３（ｂ）に示すように、外枠２４の上端部間を連結する連結材４２の両側に左右一対の軸支持部材２４ｂがそれぞれ取り付けられている。軸支持部材２４ｂには、リフト用ねじ軸３１の上端部が嵌合される支持穴２４ｃが形成され、軸支持部材２４ｂ上に調心座金付スラスト軸受３８が取り付けられている。このスラスト軸受３８は、軸受体３８ａの下軸受部３８ｂと、調心座金３８ｃとが球面部を介して摺動自在に重ねて配置され、リフト用ねじ軸３１の上端部が軸受体３８ａの上軸受部３８ｄにねじ機構３８ｅを介して固定されている。したがって、この調心座金付スラスト軸受３８により、リフト用ねじ軸３１の上端部における傾動が所定範囲で許容されて、リフト用ねじ軸３１の周方向の撓みを吸収することができる。４３は、上撓み吸収部３７を覆うカバー体である。 As shown in FIG. 3 (b), the upper deflection absorbing portion 37 has a pair of left and right shaft support members 24 b attached to both sides of a connecting member 42 that connects the upper ends of the outer frame 24. A support hole 24c into which the upper end of the lift screw shaft 31 is fitted is formed in the shaft support member 24b, and a thrust bearing 38 with a centering washer is attached on the shaft support member 24b. The thrust bearing 38 is configured such that a lower bearing portion 38b of a bearing body 38a and a centering washer 38c are slidably overlapped via a spherical surface portion, and an upper end portion of the lift screw shaft 31 is located above the bearing body 38a. It is fixed to the bearing portion 38d via a screw mechanism 38e. Therefore, the thrust bearing 38 with the aligning washer allows tilting at the upper end of the lift screw shaft 31 within a predetermined range, and can absorb the bending of the lift screw shaft 31 in the circumferential direction. Reference numeral 43 denotes a cover body that covers the upper deflection absorbing portion 37.

前記下撓み吸収部３９は、図３（ｃ）に示すように、減速機を介して駆動されるリフト用電動モータ３４の出力軸に、ギヤ機構３３を介して駆動される駆動軸４０が設けられており、この駆動軸４０に設けられた駆動ヨーク４１ａと、リフト用ねじ軸３１の下端部に設けられた受動ヨーク４１ｂとを、リフト用ねじ軸３１の軸心に垂直な平面上に配置され、かつ互いに直交するクロスピン４１ｃ，４１ｄを介して連結したユニバーサルジョイント４１により構成されている。 As shown in FIG. 3C, the lower deflection absorbing portion 39 is provided with a drive shaft 40 driven through a gear mechanism 33 on the output shaft of a lift electric motor 34 driven through a speed reducer. The drive yoke 41 a provided on the drive shaft 40 and the passive yoke 41 b provided on the lower end of the lift screw shaft 31 are arranged on a plane perpendicular to the axis of the lift screw shaft 31. And a universal joint 41 connected through cross pins 41c and 41d orthogonal to each other.

一方、図３,図４に示すように、内枠２５の左右のポストの下部間に受動ビーム材５２が連結されており、受動ビーム材５２と駆動ビーム材３６とが、緩衝装置５１を具備した連結部５０により連動連結されている。 On the other hand, as shown in FIGS. 3 and 4, the passive beam material 52 is connected between the lower portions of the left and right posts of the inner frame 25, and the passive beam material 52 and the drive beam material 36 include the buffer device 51. The connecting portion 50 is interlocked and connected.

緩衝装置５１は、図３（ａ）に示すように、上位に駆動ビーム材３６が配置され、下位に受動ビーム材５２が配置される。そして、駆動ビーム材３６の下面に、所定間隔をあけて左右一対の連結筒体５３が垂設され、これら連結筒体５３の底部に、駆動板（駆動部材）５４が取り付けられている。受動ビーム材５２の後部に、左右の駆動板５４の下方に対向する左右一対の受動板（受動部材）５５がサポート部材に支持されて突出され、これら駆動板５４と受動板５５が接するように配置される。さらにこれら駆動板５４と受動板５５に、互いに連通する貫通穴５６, ５６がそれぞれ形成されており、各貫通穴５６にそれぞれ規制軸５７が遊嵌される。規制軸５７は、上端部にボルト固定された上鍔部（規制部）５７Ｕが取り付けられ、この上鍔部５７Ｕと駆動板５４との間に、複数の皿ばねからなる上緩衝ばね（上緩衝部材）５８Ｕが規制軸５７に外嵌されて介装されている。また規制軸５７は、下端部にボルト固定された下鍔部（規制部）５７Ｄが取り付けられ、下鍔部５７Ｄと受動板５５との間に、複数の皿ばねからなる下緩衝ばね（緩衝部材）５８Ｄが規制軸５７に外嵌されて介装されている。５９は、受動板５５から下方に垂設されて下緩衝ばね（下緩衝部材）５８Ｄを覆うカバー筒である。 As shown in FIG. 3A, the shock absorber 51 has the driving beam material 36 disposed at the upper level and the passive beam material 52 disposed at the lower level. A pair of left and right connecting cylinders 53 are suspended from the lower surface of the driving beam member 36 at a predetermined interval, and a driving plate (driving member) 54 is attached to the bottom of the connecting cylinders 53. A pair of left and right passive plates (passive members) 55 facing the lower side of the left and right drive plates 54 are supported by the support members and protrude from the rear portion of the passive beam member 52 so that the drive plates 54 and the passive plates 55 are in contact with each other. Be placed. Further, through holes 56 are formed in the drive plate 54 and the passive plate 55 so as to communicate with each other, and the regulation shafts 57 are loosely fitted in the through holes 56, respectively. The restriction shaft 57 is attached with an upper flange portion (restriction portion) 57U which is bolted to the upper end portion, and an upper buffer spring (upper buffer spring) composed of a plurality of disc springs between the upper flange portion 57U and the drive plate 54. Member) 58U is externally fitted to the restriction shaft 57 and interposed. The restriction shaft 57 is provided with a lower flange part (restriction part) 57D which is bolted to the lower end part, and a lower buffer spring (buffer member) comprising a plurality of disc springs between the lower flange part 57D and the passive plate 55. 58D is externally fitted to the restriction shaft 57 and interposed. Reference numeral 59 denotes a cover cylinder that is suspended downward from the passive plate 55 and covers the lower buffer spring (lower buffer member) 58D.

上記構成において、リフト用電動モータ３４が起動されてリフト用ねじ軸３１が回転され、ローラゲージ３２を介して駆動板５４が上昇される。そして、駆動板５４に緩衝装置５１を有する連結部５０を介して受動板５５が従動され、内枠２５が上昇される。さらに巻き掛け式伝動機構３０を介してキャリッジ２７が上昇され、荷役用フォーク１６が持ち上げられる。 In the above configuration, the lift electric motor 34 is activated to rotate the lift screw shaft 31, and the drive plate 54 is raised via the roller gauge 32. And the passive plate 55 is driven by the drive plate 54 via the connection part 50 which has the buffer device 51, and the inner frame 25 is raised. Further, the carriage 27 is raised via the winding transmission mechanism 30 and the cargo handling fork 16 is lifted.

この荷役用フォーク１６に荷が載置されている場合、荷搭載の荷役用フォーク１６を上方に起動する際には、リフト用ねじ軸３１によりローラゲージ３２を介して駆動板５４が上昇されると、荷搭載の荷役用フォーク１６の負荷がかかる受動板５５との間で、駆動板５４に上方への衝撃力が発生し、ローラゲージ３２に伝達される。しかし、上緩衝ばね５８Ｕの作用により、駆動板５４に加わる上方への衝撃力が吸収されて緩衝される。 When a load is placed on the cargo handling fork 16, when the cargo loading fork 16 is started upward, the drive plate 54 is lifted by the lift screw shaft 31 via the roller gauge 32. Then, an upward impact force is generated on the drive plate 54 between the load loaded fork 16 and the passive plate 55 to which the load is applied, and is transmitted to the roller gauge 32. However, the upward impact force applied to the drive plate 54 is absorbed and buffered by the action of the upper buffer spring 58U.

また荷役用フォーク１６により、着地された荷を持ち上げる際、持ち上げようとする駆動板５４に対して、荷役用フォーク１６から巻き掛け式伝動機構３０を介して受動板５５に下方への衝撃力が発生する。しかし、上緩衝ばね５８Ｕの作用により、駆動板５４に加わる上方への衝撃力が吸収されて緩衝される。 Further, when the landed load is lifted by the cargo handling fork 16, a downward impact force is applied to the passive plate 55 from the cargo handling fork 16 via the winding transmission mechanism 30 to the drive plate 54 to be lifted. Occur. However, the upward impact force applied to the drive plate 54 is absorbed and buffered by the action of the upper buffer spring 58U.

これにより、ローラゲージ３２を含む周辺部材への衝撃を減少させて磨耗や変形、破損を効果的に防止して、リフト装置の長寿命化をはかることができる。
また、荷役用フォーク１６は、キャリッジ２７に片持ち支持されており、内枠２５および連結材４２を介して受動板５５に偏荷重が加わることになるが、受動板５５と駆動板５４とが固定されておらず、上下緩衝ばね５８Ｕ，５８Ｄにより互いに圧接されるだけであり、規制軸５７から貫通穴５６に遊嵌されているので、受動板５５の位置ずれを許容することができ、ローラゲージ３２に加わる偏荷重を大幅に減少させることができる。 As a result, the impact on the peripheral members including the roller gauge 32 can be reduced to effectively prevent wear, deformation, and breakage, thereby extending the life of the lift device.
In addition, the cargo fork 16 is cantilevered by the carriage 27, and an offset load is applied to the passive plate 55 via the inner frame 25 and the connecting member 42, but the passive plate 55 and the drive plate 54 are separated from each other. It is not fixed, and is merely pressed against each other by the upper and lower buffer springs 58U and 58D, and is loosely fitted into the through hole 56 from the restriction shaft 57, so that the displacement of the passive plate 55 can be allowed, and the roller Uneven load applied to the gauge 32 can be greatly reduced.

なお、ここで上緩衝ばね５８Ｕに、同一弾性力の２枚一組で３組の皿ばねを使用し、下緩衝ばね５８Ｄに２枚一組の皿ばねを使用し、下緩衝ばね５８Ｄの弾性力より、上緩衝ばね５８Ｕの弾性力を大きくしたのは、載荷走行中に段差を乗り越える時に、駆動板（駆動板）５４から受動板（変換駆動体）５５に加わる下方への振動や衝撃力［または受動板（変換駆動体）５５から駆動板（駆動板）５４に下方に加わる衝撃力］が、その逆方向に生じる振動や衝撃力より大きいためである。 Here, three sets of disc springs are used for the upper buffer spring 58U, and two sets of disc springs are used for the lower buffer spring 58D, and the elasticity of the lower buffer spring 58D is used. The reason why the elastic force of the upper buffer spring 58U is made larger than the force is that the downward vibration and impact force applied from the drive plate (drive plate) 54 to the passive plate (conversion drive body) 55 when climbing over the step during loading travel. This is because [or the impact force applied downward from the passive plate (conversion drive body) 55 to the drive plate (drive plate) 54] is larger than the vibration or impact force generated in the opposite direction.

上記実施例１によれば、荷が支持された荷役用フォーク１６を上昇させる起動時に、荷と荷役用フォーク１６の荷重により、ローラゲージ３２から駆動板５４に上方への衝撃力が発生する。この衝撃力を緩衝装置５１の上緩衝ばね５８Ｕにより吸収して、効果的に緩衝することができる。また、リフト用ねじ軸３１を回転駆動して荷役用フォーク１６を上昇させ、着地された荷を持ち上げる時に、荷と荷役用フォーク１６の荷重により、受動板５５に下方への衝撃力が発生する。この衝撃力を緩衝装置５１により吸収し、効果的に緩衝することができる。さらに、荷役用フォーク１６に載荷状態の走行中に、路面段差を乗り越えると、受動板５５に上下方向の振動と衝撃力が発生する。これら振動や衝撃力を緩衝装置５１により吸収して、効果的に緩衝することができる。このように走行中の振動や衝撃力を緩衝できることで、ローラゲージ３２やリフト用ねじ軸３１などの磨耗や変形、損傷を未然に防止することができる。また、緩衝装置がリフト用ねじ軸に介在されることがないので、リフト用ねじ軸の昇降ストロークを削減することもない。 According to the first embodiment, an upward impact force is generated from the roller gauge 32 to the drive plate 54 due to the load and the load of the cargo handling fork 16 at the time of starting up the cargo handling fork 16 on which the load is supported. This impact force can be absorbed by the upper buffer spring 58U of the shock absorber 51 and effectively buffered. Further, when the lifting screw shaft 31 is rotationally driven to raise the cargo handling fork 16 and lift the landed load, a downward impact force is generated on the passive plate 55 by the load of the cargo and the cargo handling fork 16. . This impact force can be absorbed by the shock absorber 51 and effectively buffered. Further, when the vehicle passes over the road surface level while traveling on the loading fork 16, vertical vibration and impact force are generated on the passive plate 55. These vibrations and impact forces can be absorbed by the shock absorber 51 and effectively buffered. As described above, since vibration and impact force during running can be buffered, wear, deformation, and damage of the roller gauge 32 and the lift screw shaft 31 can be prevented. Further, since the shock absorber is not interposed in the lift screw shaft, the lifting stroke of the lift screw shaft is not reduced.

さらに、互いに接する駆動板５４と受動板５５とを、上下緩衝ばね５８Ｕ，５８Ｄにより互いに圧接する方向に付勢したので、駆動板５４に加わる上方への衝撃、受動板５５に加わる下方への衝撃や振動を吸収して効果的に緩衝することができる。また、荷役用フォーク１６が片持ち状に支持されて、受動板５５に変位することがあっても、駆動板５４からローラゲージ３２に偏りのある衝撃力が伝わることが防止されて、磨耗や変形、損傷防止効果が高い。 Further, since the drive plate 54 and the passive plate 55 that are in contact with each other are urged in the direction in which they are pressed against each other by the upper and lower buffer springs 58U and 58D, the upward impact applied to the drive plate 54 and the downward impact applied to the passive plate 55 And can absorb the vibration and effectively buffer it. Further, even if the cargo handling fork 16 is supported in a cantilevered manner and displaced to the passive plate 55, it is possible to prevent a biased impact force from being transmitted from the drive plate 54 to the roller gauge 32, thereby preventing wear and tear. Highly effective in preventing deformation and damage.

なお、上記実施例１では、リーチ式の電動フォークリフトを説明したが、カウンタウェイト式のフォークリフトであっても差し支えない。
［実施例２］
本発明に係る電動式リフト装置を備えた簡易型の可動リフターの実施例２を、図８を参照して説明する。なお、実施例１と同一部材には同一符号を付して説明を省略する。また車体１１や移動体６１に電動式リフト装置を設けたが、固定された基台に取り付けることもできる。 Although the reach type electric forklift has been described in the first embodiment, a counterweight type forklift may be used.
[Example 2]
Second Embodiment A simplified movable lifter equipped with an electric lift device according to the present invention will be described with reference to FIG. Note that the same members as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. Moreover, although the electric lift device is provided in the vehicle body 11 or the moving body 61, it can be attached to a fixed base.

走行車輪６２を有する自走式または手動式の移動体６１から前方に左右一対のアウトリガー１４が突設され、これらアウトリガー１４にそれぞれトレールホイール１５が回転自在に支持されている。移動体６１には、門方のガイド枠６３が立設され、ガイド枠６３のポスト部６３ａ内面に形成された昇降レール間に、案内ローラ６４ａを介してキャリッジ（昇降移動体）６４が昇降自在に案内されている。このキャリッジ６４から前方に、荷役具である左右一対の荷役用フォーク（荷役部材）１６が取り付けられている。 A pair of left and right outriggers 14 project forward from a self-propelled or manual moving body 61 having traveling wheels 62, and trail wheels 15 are rotatably supported by the outriggers 14, respectively. A guide frame 63 for the gate is erected on the moving body 61, and a carriage (elevating moving body) 64 can be raised and lowered via a guide roller 64a between elevating rails formed on the inner surface of the post portion 63a of the guide frame 63. It is guided to. A pair of left and right cargo handling forks (a cargo handling member) 16 as a cargo handling tool is attached in front of the carriage 64.

ガイド枠６３の背面に設けられた電動式のリフト装置６０は、リフト用ねじ軸３１が１本である点、および巻き掛け式伝動機構３０からなる倍速機構を有しない点で、実施例１のリフト装置２３と相違している。すなわち、ガイド枠６３の背面略中央部に、リフト用電動モータ３４によりギヤ機構３３を介して回転駆動されるリフト用ねじ軸３１が立設配置され、リフト用ねじ軸３１に、ローラゲージ３２と接触力均等化部材３５が嵌合されるとともに、その上端部に上撓み吸収部３７が、下端部に下撓み吸収部３９がそれぞれ介在されている。 The electric lift device 60 provided on the back surface of the guide frame 63 is different from that of the first embodiment in that the lift screw shaft 31 is one and the double speed mechanism including the winding transmission mechanism 30 is not provided. This is different from the lift device 23. That is, a lift screw shaft 31 that is rotationally driven by the lift electric motor 34 via the gear mechanism 33 is erected and arranged substantially at the center of the back surface of the guide frame 63. The contact force equalizing member 35 is fitted, and an upper deflection absorbing portion 37 is interposed at the upper end portion thereof, and a lower deflection absorbing portion 39 is interposed at the lower end portion thereof.

さらに、ガイド枠６３に、ポスト部６３ａの内面に形成されたガイドレールに、キャリッジ６４が案内ローラ６４ａを介して昇降自在に案内されている。このキャリッジ６４に左右一対の荷役用フォーク１６が取り付けられているが、荷役部材としてたとえば出退テーブルなどであってもよい。 Further, the carriage 64 is guided to the guide frame 63 by a guide rail formed on the inner surface of the post portion 63a through a guide roller 64a so as to be movable up and down. Although a pair of left and right cargo handling forks 16 is attached to the carriage 64, the cargo handling member may be, for example, an exit / retreat table.

接触力均等化部材３５の上部に、リフト用ねじ軸３１が遊嵌される穴部を有する駆動ビーム材３６が設置され、左右一対の連結筒体５３を介して駆動板５４がそれぞれ取り付けられている。そしてキャリッジ２７から後方に突出された受動板５５と、駆動板５４の連結部５０に、実施例１と同様の左右一対の緩衝装置５１が設けられている。 A drive beam member 36 having a hole portion in which the lift screw shaft 31 is loosely fitted is installed on the upper part of the contact force equalizing member 35, and a drive plate 54 is attached via a pair of left and right connecting cylinders 53. Yes. A pair of left and right shock absorbers 51 similar to those of the first embodiment are provided at the passive plate 55 protruding rearward from the carriage 27 and the connecting portion 50 of the drive plate 54.

以上のように、上記実施例２の電動式のリフト装置６０によれば、実施例１と同様の作用効果を奏することができ、倍速機構を採用しないものであっても、同様に適用することができる。
［緩衝装置の変形例］
緩衝装置５１の変形例を、図９を参照して説明する。すなわち、この緩衝装置７０は、駆動ビーム材３６から突設され上部に配置される駆動板７１と、受動ビーム材５２に突設されて駆動板７１の下部に接して配置される受動板７２の四隅部に、案内溝７１Ｃ,７５Ｃを形成する。そして、駆動板７１と受動板７２の四隅位置に、案内溝７２Ｃ,７１Ｃを介してそれぞれ相対する方向に延びるガイドロッド７１Ｒを取り付け、これらガイドロッド７１Ｒ,７２Ｒの端部に底部規制板７１Ｄ，天部規制板７２Ｄを取り付け、これにより、駆動板７１と受動板７２が接近離間可能に配置する。さらに駆動板７１と天部規制板７２Ｕの間に、駆動板７１を受動板７２側に付勢する上コイルばね（上緩衝部材）７３Ｕを介装し、受動板７２と底部規制板７１Ｄとの間に、受動板７２を駆動板７１側に付勢する下コイルばね（下緩衝部材）７３Ｄを介装する。これにより、駆動板７１に加わる上方への衝撃を吸収することができ、また受動板７２に加わる下方への衝撃を吸収することができる。 As described above, according to the electric lift device 60 of the second embodiment, the same effect as that of the first embodiment can be obtained, and even if the double speed mechanism is not employed, the same applies. Can do.
[Modification of shock absorber]
A modification of the shock absorber 51 will be described with reference to FIG. That is, the shock absorber 70 includes a driving plate 71 protruding from the driving beam member 36 and disposed at the upper portion, and a passive plate 72 protruding from the passive beam member 52 and disposed in contact with the lower portion of the driving plate 71. Guide grooves 71C and 75C are formed at the four corners. Then, guide rods 71R extending in opposite directions via guide grooves 72C and 71C are attached to the four corner positions of the drive plate 71 and the passive plate 72, and the bottom regulating plate 71D and the ceiling are attached to the ends of the guide rods 71R and 72R. The part regulating plate 72D is attached, and thereby, the driving plate 71 and the passive plate 72 are arranged so as to be able to approach and separate. Further, an upper coil spring (upper buffer member) 73U that urges the drive plate 71 toward the passive plate 72 is interposed between the drive plate 71 and the top restricting plate 72U, and the passive plate 72 and the bottom restricting plate 71D are interposed. A lower coil spring (lower buffer member) 73D for biasing the passive plate 72 toward the drive plate 71 is interposed therebetween. As a result, an upward impact applied to the drive plate 71 can be absorbed, and a downward impact applied to the passive plate 72 can be absorbed.

上記実施例１では、スタッカクレーンに搭載された電動式リフト装置を説明したが、この電動式リフト装置を具備したスタッカクレーンやピッキング装置などにも、適用することができる。 In the first embodiment, the electric lift device mounted on the stacker crane has been described. However, the present invention can also be applied to a stacker crane, a picking device, and the like equipped with the electric lift device.

１６荷役用フォーク
２１荷役装置
２３リフト装置
２３Ａ昇降ガイド部材
２３Ｂリフト駆動部
２４外枠
２５内枠
２７キャリッジ（昇降移動体）
３０巻き掛け式伝動機構
３１リフト用ねじ軸
３２ローラゲージ（変換駆動体）
３４リフト用電動モータ
３５接触力均等化部材
３６駆動ビーム材
３７上撓み吸収部
３８調心座金付スラスト軸受
３９下撓み吸収部
４０駆動軸
５０連結部
５１緩衝装置
５２受動ビーム材
５３連結筒体
５４駆動板（駆動部材）
５５受動板（受動部材）
５６貫通穴
５７規制軸
５７Ｕ上鍔部（上端規制部）
５７Ｄ下鍔部（下端規制部）
５８Ｕ上緩衝ばね（上弾性部材）
５８Ｄ下緩衝ばね（上弾性部材）
６０リフト装置
６１移動体
６３ガイド枠
６４キャリッジ（昇降移動体）
７０緩衝装置
７１駆動板
７１Ｕ底部規制板
７２受動板
７２Ｄ天部規制板
７３Ｕ上コイルばね（上緩衝部材）
７３Ｄ下コイルばね（下緩衝部材） 16 fork 21 for cargo handling cargo handling device 23 lift device 23A lift guide member 23B lift drive unit 24 outer frame 25 inner frame 27 carriage (lifting and moving body)
30 Winding type transmission mechanism 31 Screw shaft for lift 32 Roller gauge (conversion drive)
34 Lifting electric motor 35 Contact force equalizing member 36 Driving beam material 37 Upper deflection absorbing portion 38 Thrust bearing with aligning washer 39 Lower deflection absorbing portion 40 Driving shaft 50 Connecting portion 51 Buffer device 52 Passive beam material 53 Connecting cylinder 54 Drive plate (drive member)
55 Passive plate (passive member)
56 Through hole 57 Restriction shaft 57U Upper collar part (upper end restriction part)
57D Lower collar part (lower end regulating part)
58U Upper buffer spring (Upper elastic member)
58D Lower shock absorber spring (upper elastic member)
60 Lifting device 61 Moving body 63 Guide frame 64 Carriage (lifting / lowering moving body)
70 shock absorber 71 drive plate 71U bottom restricting plate 72 passive plate 72D top restricting plate 73U upper coil spring (upper shock absorbing member)
73D Lower coil spring (lower shock absorber)

Claims

A lift screw shaft disposed along the lifting guide member, a lift electric motor that rotationally drives the lift screw shaft, and a conversion drive body that is externally fitted to the lift screw shaft and driven to move up and down. An electric lift device capable of driving the cargo handling member up and down along the lifting guide member by the conversion driving body,
A drive member supported by the conversion drive body, a passive member interlocked with the cargo handling member, and a connecting portion that connects the drive member and the passive member are provided from the lift screw shaft via the conversion drive body. A shock absorber capable of buffering an upward impact force applied to the drive member and a downward impact applied to the passive member from the cargo handling member,
The shock absorber is
The upper drive member and the lower passive member are arranged in contact with each other and can be separated from each other, and an upper elastic member that biases the upper drive member toward the lower passive member, and the lower passive member. An electric lift device comprising a lower elastic member for biasing toward the upper drive member side .

An outer frame that is erected, an inner frame that is guided so as to be movable up and down along the outer frame, a lifting and lowering body that is guided so as to be movable up and down along the inner frame, and a cargo handling member is provided; And a winding transmission mechanism having a cable body connected to the lifting and lowering body and the other end connected to the elevating and moving body and a turning ring body wound around an intermediate portion of the cable body provided on the inner frame. A lift screw shaft disposed along the outer frame, a lift electric motor that rotationally drives the lift screw shaft, a conversion drive body that is externally fitted to the lift screw shaft and is driven up and down, An electric lift device comprising:
An upward impact force applied to the drive member from the screw shaft for lift through the conversion drive body to the connecting portion of the drive member supported by the conversion drive body and the passive member attached to the inner frame, and a cargo handling member A shock absorber capable of buffering the downward impact force applied to the passive member via the lifting and lowering moving body, the winding transmission mechanism and the inner frame,
The shock absorber is
The upper drive member and the lower passive member are arranged in contact with each other and can be separated from each other, and an upper elastic member that biases the upper drive member toward the lower passive member, and the lower passive member. An electric lift device comprising a lower elastic member for biasing toward the upper drive member side .

An outer frame erected on the traveling body, an inner frame guided so as to be movable up and down along the outer frame, a carriage provided so as to be movable up and down along the inner frame and provided with a cargo fork, and one end of the carriage A winding transmission mechanism having a lifting chain connected to the outer frame and having the other end connected to the carriage and a turning ring provided on the inner frame and winding an intermediate portion of the lifting chain. A lift screw shaft erected along the outer frame, a lift electric motor that rotationally drives the lift screw shaft, and a conversion drive body that is externally fitted to the lift screw shaft and driven to move up and down A forklift equipped with an electric lift device comprising:
An upper portion that is applied to the drive member from the lift screw shaft via the conversion drive member to a connecting portion that connects the upper drive member supported by the conversion drive member and the lower passive member attached to the inner frame. Shock absorbers capable of buffering the impact force on the lower side and the downward impact force applied to the passive member from the cargo handling fork via the electric lift device,
The shock absorber is
The upper drive member and the lower passive member are arranged in contact with each other and can be separated from each other, and an upper elastic member that biases the upper drive member toward the lower passive member, and the lower passive member. A forklift characterized by comprising a lower elastic member for urging the upper drive member side .

An outer frame erected on the traveling body, an inner frame guided so as to be movable up and down along the outer frame, a carriage provided so as to be movable up and down along the inner frame and provided with a cargo fork, and one end of the carriage A winding transmission mechanism having a lifting chain connected to the outer frame and having the other end connected to the carriage and a turning ring provided on the inner frame and winding an intermediate portion of the lifting chain. A lift screw shaft erected along the outer frame, a lift electric motor that rotationally drives the lift screw shaft, and a conversion drive body that is externally fitted to the lift screw shaft and driven to move up and down A forklift equipped with an electric lift device comprising:
An upper portion that is applied to the drive member from the lift screw shaft via the conversion drive member to a connecting portion that connects the upper drive member supported by the conversion drive member and the lower passive member attached to the inner frame. Shock absorbers capable of buffering the impact force on the lower side and the downward impact force applied to the passive member from the cargo handling fork via the electric lift device,
The shock absorber is
The upper drive member and the lower passive member are arranged so as to be in contact with each other and can be separated from each other, and a through hole communicating with the drive member and the passive member is formed.
While providing an upper end restriction portion at the upper end portion of the restriction shaft loosely fitted in the through hole, a lower end restriction portion is provided at the lower end portion,
An upper elastic member externally fitted to the restriction shaft is interposed between the upper end restriction portion and the drive member, and is fitted to the restriction shaft between the lower end restriction portion and the passive member. A forklift characterized by interposing a lower elastic member .