JP4316068B2 - Working vehicle - Google Patents

Working vehicle Download PDF

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Publication number
JP4316068B2
JP4316068B2 JP27988899A JP27988899A JP4316068B2 JP 4316068 B2 JP4316068 B2 JP 4316068B2 JP 27988899 A JP27988899 A JP 27988899A JP 27988899 A JP27988899 A JP 27988899A JP 4316068 B2 JP4316068 B2 JP 4316068B2
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JP
Japan
Prior art keywords
hydraulic
work
valve
assembly
pto
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JP27988899A
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JP2001097062A (en
Inventor
昭夫 大島
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MITSUBISHI NOUKI KABUSHIKI KAISHA
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MITSUBISHI NOUKI KABUSHIKI KAISHA
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Description

【0001】
【発明の属する技術分野】
本発明は、クローラトラクタ等の作業用走行車の技術分野に属するものである。
【0002】
【従来の技術】
一般に、この種クローラトラクタ等の作業用走行車のなかには、PTO変速ケース、走行用油圧ポンプ、作業用油圧ポンプ、PTO関連の油圧バルブ、走行関連の油圧バルブ等の機器を機体に設けるにあたり、これらの機器を、メンテナンス性に優れる運転席の下方スペースに配置したものがあるが、各機器を、運転席の下方スペースに個別に配置した場合には、機体に対する各機器の組付作業や、機体組付後の油圧配管作業が煩雑になる許りでなく、スペース不足が生じる不都合があった。
【0003】
【発明が解決しようとする課題】
そこで、前記PTO変速ケースに、予め走行用油圧ポンプおよび作業用油圧ポンプを一体的に組付けて変速・油圧アッシーを構成することにより、油圧ポンプ等の機体組付作業を容易にすると共に、スペース不足を解消することが提案されているが、油圧バルブにあっては、依然として個別配置されているため、機体に対する油圧バルブの組付作業や、機体組付後の油圧配管作業が煩雑であり、しかも、油圧バルブをメンテナンスする際に変速・油圧アッシー等が邪魔になる可能性があった。
【0004】
【課題を解決するための手段】
本発明は、上記の如き実情に鑑みこれらの課題を解決することを目的として創作されたものであって、請求項1の発明は、クローラ式走行部、キャビンで覆われ、運転席が設けられる操作部を備えて構成された作業用走行車において、アッシーベースとなる作業動力変速用のPTO変速ケースの上部に走行用油圧ポンプを、前部に作業用油圧ポンプをそれぞれ一体的に組付けて変速・油圧アッシーを構成し、該変速・油圧アッシーを前記運転席の下方スペースに配置したものに作業関連および走行関連の油圧バルブを設けるにあたり、該作業関連の油圧バルブは、作業用油圧ポンプからの油圧でPTO変速ケース内のPTOクラッチ機構を入切するPTOクラッチバルブであり、走行関連の油圧バルブは、走行用油圧ポンプの相反する斜板制御用油路を連通させるバイパスバルブであり、これら油圧バルブを前記変速・油圧アッシーの上部に一体的に組付けたことを特徴とする作業用走行車である。つまり、機体組付前の変速・油圧アッシーに油圧バルブや油圧配管を予め組付けておくことができるため、機体組付作業や油圧配管作業を簡略化することができ、しかも、油圧バルブは、変速・油圧アッシーの上部に組付けられているため、運転席側からのメンテナンスが容易になる許りでなく、変速・油圧アッシーの周囲に油圧配管等のレイアウトスペースを確保することができる。しかもPTOクラッチバルブは、変速・油圧アッシーを構成する作業用油圧ポンプおよびPTO変速ケースに接続されるものであるため、機体組付前に油圧配管の組付けを済ませておくことができ、その結果、機体組付後の油圧配管作業を軽減することができる。またバイパスバルブは、変速・油圧アッシーを構成する走行用油圧ポンプに接続されるものであるため、機体組付前に油圧配管の組付けを済ませておくことができ、その結果、機体組付後の油圧配管作業を軽減することができる。
【0005】
【発明の実施の形態】
次に、本発明の実施の形態の一つを図面に基づいて説明する。図面において、1はクローラトラクタの走行機体であって、該走行機体1は、クローラ式の走行部2、キャビン3で覆われた操作部4、各種の作業機(図示せず)を連結可能な作業機連結部5等を備えている。そして、作業機連結部5には、機体後部に上下揺動自在に連結される昇降リンク機構6、該昇降リンク機構6のロアリンク6aをリフトロッド7を介して吊持する左右一対のリフトアーム8、該リフトアーム8と機体後部との間に介設される左右一対の作業機昇降シリンダ9、左右何れかのリフトロッド7に介設される作業機傾斜シリンダ10等が設けられており、そのため、作業機昇降シリンダ9の油圧伸縮作動に応じて作業機が昇降する一方、作業機傾斜シリンダ10の油圧伸縮作動に応じて作業機が左右傾斜するが、これらの基本構成は何れも従来通りである。
【0006】
11は前記操作部4に設けられる運転席であって、該運転席11の下方には、後述する油圧機器等の機器を組込むためのスペースSが確保されているが、該スペースSの上方には、運転席11の着脱操作もしくは傾倒操作に応じて開放されるメンテナンス用の開口(図示せず)が確保されている。
【0007】
12は前記スペースSに組体として組込まれる変速・油圧アッシーであって、該変速・油圧アッシー12は、アッシーのベースとなるPTO変速ケース13、該PTO変速ケース13の上部に一体的に組付けられる走行用油圧ポンプ14、PTO変速ケース13の前部に一体的に組付けられる作業用油圧ポンプ15等で構成されている。そして、前記PTO変速ケース13は、機体前部に搭載されるエンジン16の動力をプロペラシャフト17を介して入力し、該動力を、PTO変速ケース13に内装されるPTOクラッチ機構やPTO変速機構を介してPTO軸(作業機動力取出軸)18に伝動すると共に、前記走行用油圧ポンプ14および作業用油圧ポンプ15に伝動するように構成されている。
【0008】
前記走行用油圧ポンプ14は、直列状に連結される一対の可変容量ポンプ19L、19R、該可変容量ポンプ19L、19Rの斜板制御をする斜板制御回路20L、20R等を組込んで構成されており、各可変容量ポンプ19L、19Rの吐出ポートには、それぞれ走行用油圧モータ21L、21Rが接続されている。
【0009】
一方、前記作業用油圧ポンプ15は、一対の定容量ポンプ22、23を直列状に連結して構成されており、そのうち定容量ポンプ22の吐出ポートには、外部油圧制御弁24および作業機制御弁25が直列状に接続されているが、作業機制御弁25には、定容量ポンプ22から供給される作動油を分流させる分流弁26、一方の分流油路に接続される作業機昇降制御弁27、他方の分流油路に接続される作業機傾斜制御弁28等が組み込まれている。そして、作業機昇降制御弁27は、前記作業機昇降シリンダ9(単動シリンダ)の伸縮作動を制御する一方、作業機傾斜制御弁28は、作業機傾斜シリンダ10(複動シリンダ)の伸縮作動を制御するが、作業機昇降制御弁27と作業機昇降シリンダ9との間には、作業機の降下速度を調整する降下速度調整弁29が介設されている。
【0010】
30は前記PTO変速ケース13内のPTOクラッチ機構を入切するPTOクラッチバルブであって、該PTOクラッチバルブ30のポンプポートは、前記作業用油圧ポンプ15を構成する定容量ポンプ23の吐出ポートに油圧配管31を介して接続される一方、タンクポートは、作動油タンクを兼ねるPTO変速ケース13に油圧配管32を介して接続されている。そして、図示しないPTOクラッチ操作具の操作に応じたバルブ切換作動によってPTOクラッチ機構を入切するように構成されるが、PTOクラッチバルブ30は、変速・油圧アッシー12(PTO変速ケース13)の上部に一体的に組付けられるようになっている。即ち、機体組付前の変速・油圧アッシー12にPTOクラッチバルブ30や油圧配管31、32を予め組付けておくことができるため、機体組付作業や、機体組付け後の油圧配管作業を簡略化することができ、しかも、PTOクラッチバルブ30を変速・油圧アッシー12の上部に組付けているため、運転席11側からのメンテナンスが容易になる許りでなく、変速・油圧アッシー12の左右側方(周囲)に油圧配管等のレイアウトスペースを確保することができるようになっている。
【0011】
さらに、33は前記斜板制御回路20L、20Rの相反する斜板制御用油路を所定の操作に応じて連通させるバイパスバルブであって、該バイパスバルブ33は、4本の油圧配管34、35、36、37を介して前記走行用油圧ポンプ14に接続されるものであるが、変速・油圧アッシー12の上部に一体的に組付けるようにしたため、機体組付前の変速・油圧アッシー12にバイパスバルブ33および油圧配管34、35、36、37を予め組付けておくことが可能になり、その結果、機体組付作業や、機体組付け後の油圧配管作業を簡略化することができ、しかも、バイパスバルブ33を変速・油圧アッシー12の上部に組付けることによって、運転席11側からのメンテナンスが容易になる許りでなく、変速・油圧アッシー12の左右側方(周囲)に油圧配管等のレイアウトスペースを確保できる利点がある。
【0012】
叙述の如く構成されたものにおいて、作業動力を変速するPTO変速ケース13に、走行用油圧ポンプ14および作業用油圧ポンプ15を一体的に組付けて変速・油圧アッシー12を構成すると共に、該変速・油圧アッシー12を運転席11の下方スペースSに配置した走行機体1において、作業関連もしくは走行関連の油圧バルブ30、33を設けるにあたり、該油圧バルブ30、33を、前記変速・油圧アッシー12の上部に一体的に組付けたため、機体組付前の変速・油圧アッシー12に油圧バルブ30、33や油圧配管31、32、34、35、36、37を予め組付けておくことが可能になり、その結果、機体組付作業や油圧配管作業を簡略化することができる。
【0013】
しかも、前記油圧バルブ30、31は、変速・油圧アッシー12の上部に組付けられているため、運転席11側からのメンテナンスが容易になる許りでなく、変速・油圧アッシー12の周囲に油圧配管等のレイアウトスペースを確保することができる。
【0014】
また、前記作業関連の油圧バルブは、変速・油圧アッシー12を構成する作業用油圧ポンプ15およびPTO変速ケース13に接続されるPTOクラッチバルブ30であるため、機体組付前に油圧配管31、32の組付けを済ませておくことができ、その結果、機体組付後の油圧配管作業を軽減することができる。
【0015】
また、前記走行関連の油圧バルブは、走行用油圧ポンプ14の相反する斜板制御用油路を連通させるバイパスバルブ33であるため、機体組付前に油圧配管31、32の組付けを済ませておくことができ、その結果、機体組付後の油圧配管作業を軽減することができる。
【図面の簡単な説明】
【図1】クローラトラクタの側面図である。
【図2】同上要部側面図である。
【図3】同上要部背面図である。
【図4】変速・油圧アッシーの平面図である。
【図5】同上側面図である。
【図6】走行系および作業系の油圧回路図である。
【符号の説明】
1 走行機体
4 操作部
11 運転席
12 変速・油圧アッシー
13 変速ケース
14 走行用油圧ポンプ
15 作業用油圧ポンプ
20 斜板制御回路
30 PTOクラッチバルブ
33 バイパスバルブ
[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of work vehicles such as crawler tractors.
[0002]
[Prior art]
In general, some of the working vehicles such as this type of crawler tractor are equipped with equipment such as PTO transmission case, traveling hydraulic pump, working hydraulic pump, PTO related hydraulic valve, traveling related hydraulic valve, etc. Are placed in the space below the driver's seat with excellent maintainability. However, if each device is placed separately in the space below the driver's seat, The hydraulic piping work after assembly is not allowed to be complicated, and there is a disadvantage that space shortage occurs.
[0003]
[Problems to be solved by the invention]
Therefore, the traveling hydraulic pump and the working hydraulic pump are integrally assembled in advance with the PTO transmission case to constitute a speed change / hydraulic assembly, thereby facilitating the assembly work of the machine body such as the hydraulic pump and the space. Although it has been proposed to eliminate the shortage, since the hydraulic valves are still individually arranged, the assembly work of the hydraulic valve to the aircraft and the hydraulic piping work after the installation of the aircraft are complicated, Moreover, there is a possibility that shifting, hydraulic assembly, etc. may become an obstacle when maintaining the hydraulic valve.
[0004]
[Means for Solving the Problems]
The present invention has been created in view of the above-described circumstances in order to solve these problems. The invention of claim 1 is covered with a crawler type traveling unit, a cabin, and provided with a driver's seat. the operating unit working vehicle configured with a, a traveling hydraulic pump on the top of the PTO transmission case of a working power transmission to the assembly base, respectively a working hydraulic pump to the front assembled integrally configure the transmission and hydraulic assemblies, per the speed change and hydraulic assembly to provide a work-related and the travel-related hydraulic valves to those located below the space of the driver's seat, the working-related hydraulic valves, from the work hydraulic pump Is a PTO clutch valve that turns on and off the PTO clutch mechanism in the PTO transmission case. A bypass valve for communicating the use oil passage, a working vehicle, characterized in that integrally assembled to these hydraulic valve on top of the shift-hydraulic assembly. In other words, since the hydraulic valve and hydraulic piping can be pre-assembled to the speed change / hydraulic assembly before the machine assembly, the machine assembly work and hydraulic piping work can be simplified. Since it is assembled at the upper part of the transmission / hydraulic assembly, maintenance from the driver's seat side is not permitted, and a layout space such as hydraulic piping can be secured around the transmission / hydraulic assembly. Moreover, since the PTO clutch valve is connected to the working hydraulic pump and the PTO speed change case that constitute the speed change / hydraulic assembly, it is possible to assemble the hydraulic piping before assembling the airframe. The hydraulic piping work after the machine assembly can be reduced. In addition, the bypass valve is connected to the traveling hydraulic pump that constitutes the speed change / hydraulic assembly, so the hydraulic piping can be assembled before assembling the airframe. The hydraulic piping work can be reduced.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, one embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of a crawler tractor. The traveling machine body 1 can be connected to a crawler type traveling unit 2, an operation unit 4 covered with a cabin 3, and various working machines (not shown). A work machine connecting portion 5 and the like are provided. The work machine connecting portion 5 includes a lift link mechanism 6 connected to the rear portion of the machine body so as to swing up and down, and a pair of left and right lift arms that suspends a lower link 6a of the lift link mechanism 6 via a lift rod 7. 8, a pair of left and right work machine lifting cylinders 9 interposed between the lift arm 8 and the rear part of the machine body, a work machine tilting cylinder 10 interposed between the left and right lift rods 7 and the like are provided. For this reason, the work implement moves up and down in accordance with the hydraulic expansion / contraction operation of the work implement elevating cylinder 9, while the work implement tilts left and right in accordance with the hydraulic expansion / contraction operation of the work implement tilting cylinder 10, but these basic configurations are all conventional. It is.
[0006]
Reference numeral 11 denotes a driver seat provided in the operation unit 4. A space S for assembling a device such as a hydraulic device to be described later is secured below the driver seat 11. Is provided with a maintenance opening (not shown) that is opened in response to the attaching / detaching operation or tilting operation of the driver's seat 11.
[0007]
Reference numeral 12 denotes a transmission / hydraulic assembly assembled as an assembly in the space S. The transmission / hydraulic assembly 12 is assembled integrally with the PTO transmission case 13 serving as the base of the assembly and the upper portion of the PTO transmission case 13. The traveling hydraulic pump 14 and the working hydraulic pump 15 assembled integrally with the front portion of the PTO transmission case 13 are configured. The PTO transmission case 13 receives the power of the engine 16 mounted on the front part of the machine body via the propeller shaft 17, and uses the PTO clutch mechanism or PTO transmission mechanism built in the PTO transmission case 13. To the PTO shaft (working machine power take-off shaft) 18 and to the traveling hydraulic pump 14 and the working hydraulic pump 15.
[0008]
The traveling hydraulic pump 14 includes a pair of variable displacement pumps 19L and 19R connected in series, and swash plate control circuits 20L and 20R for controlling the swash plate of the variable displacement pumps 19L and 19R. The traveling hydraulic motors 21L and 21R are connected to the discharge ports of the variable displacement pumps 19L and 19R, respectively.
[0009]
On the other hand, the working hydraulic pump 15 is configured by connecting a pair of constant capacity pumps 22 and 23 in series, and the discharge port of the constant capacity pump 22 includes an external hydraulic control valve 24 and a work machine control. Although the valve 25 is connected in series, the work implement control valve 25 includes a flow dividing valve 26 for diverting the hydraulic oil supplied from the constant capacity pump 22 and a work implement lift control connected to one diversion oil passage. A valve 27, a work implement inclination control valve 28 connected to the other branch oil passage, and the like are incorporated. The work implement elevating control valve 27 controls the expansion / contraction operation of the work implement elevating cylinder 9 (single-action cylinder), while the work implement inclination control valve 28 is an expansion / contraction operation of the work implement inclination cylinder 10 (double-action cylinder). However, a lowering speed adjusting valve 29 for adjusting the lowering speed of the work implement is interposed between the work implement lifting control valve 27 and the work implement lifting cylinder 9.
[0010]
Reference numeral 30 denotes a PTO clutch valve for turning on and off the PTO clutch mechanism in the PTO transmission case 13, and the pump port of the PTO clutch valve 30 is a discharge port of the constant capacity pump 23 constituting the working hydraulic pump 15. On the other hand, the tank port is connected via a hydraulic pipe 32 to a PTO transmission case 13 that also serves as a hydraulic oil tank. The PTO clutch mechanism 30 is configured to turn on and off the PTO clutch mechanism by a valve switching operation corresponding to an operation of a PTO clutch operating tool (not shown). The PTO clutch valve 30 is an upper part of the transmission / hydraulic assembly 12 (PTO transmission case 13). It is designed to be assembled in one piece. That is, since the PTO clutch valve 30 and the hydraulic pipes 31 and 32 can be assembled in advance to the transmission / hydraulic assembly 12 before assembling the airframe, the airframe assembling work and the hydraulic piping work after assembling the airframe are simplified. In addition, since the PTO clutch valve 30 is assembled to the upper part of the transmission / hydraulic assembly 12, not only is the maintenance easy from the driver's seat 11 side, but also the left / right of the transmission / hydraulic assembly 12 Layout space such as hydraulic piping can be secured on the side (periphery).
[0011]
Further, reference numeral 33 denotes a bypass valve for communicating opposite swash plate control oil passages of the swash plate control circuits 20L and 20R according to a predetermined operation. The bypass valve 33 includes four hydraulic pipes 34 and 35. , 36, 37, but connected to the traveling hydraulic pump 14 through the upper part of the transmission / hydraulic assembly 12, the transmission / hydraulic assembly 12 before assembling the machine body The bypass valve 33 and the hydraulic pipes 34, 35, 36, and 37 can be assembled in advance, and as a result, the machine assembly work and the hydraulic pipe work after the machine assembly can be simplified. Moreover, the assembly of the bypass valve 33 on the upper part of the transmission / hydraulic assembly 12 does not allow the maintenance from the driver's seat 11 side to be facilitated, but also the left / right of the transmission / hydraulic assembly 12. Square can be advantageously ensured layout space such as a hydraulic piping (ambient).
[0012]
In the structure configured as described above, the transmission hydraulic pump 14 and the working hydraulic pump 15 are integrally assembled to the PTO transmission case 13 for shifting the working power to constitute the shifting / hydraulic assembly 12, and the shifting is performed. In the traveling machine body 1 in which the hydraulic assembly 12 is disposed in the lower space S of the driver's seat 11, when the work-related or travel-related hydraulic valves 30, 33 are provided, the hydraulic valves 30, 33 are connected to the shift / hydraulic assembly 12. Since the upper part is integrally assembled, the hydraulic valves 30, 33 and the hydraulic pipes 31, 32, 34, 35, 36, 37 can be assembled in advance to the transmission / hydraulic assembly 12 before the airframe is assembled. As a result, the body assembly work and the hydraulic piping work can be simplified.
[0013]
In addition, since the hydraulic valves 30 and 31 are assembled to the upper part of the transmission / hydraulic assembly 12, not only the maintenance from the driver's seat 11 is easy, but also the hydraulic pressure around the transmission / hydraulic assembly 12. Layout space such as piping can be secured.
[0014]
The work-related hydraulic valves are the working hydraulic pump 15 constituting the speed change / hydraulic assembly 12 and the PTO clutch valve 30 connected to the PTO speed change case 13, so that the hydraulic pipes 31, 32 are installed before assembling the machine body. As a result, the hydraulic piping work after assembling the machine body can be reduced.
[0015]
In addition, the travel-related hydraulic valve is a bypass valve 33 that communicates the opposite swash plate control oil passages of the travel hydraulic pump 14, so that the hydraulic pipes 31, 32 have been assembled prior to assembly of the machine body. As a result, the hydraulic piping work after assembling the machine body can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a crawler tractor.
FIG. 2 is a side view of the main part of the same.
FIG. 3 is a rear view of the main part of the same.
FIG. 4 is a plan view of a transmission / hydraulic assembly.
FIG. 5 is a side view of the same.
FIG. 6 is a hydraulic circuit diagram of a traveling system and a working system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Traveling machine body 4 Operation part 11 Driver's seat 12 Shifting / hydraulic assembly 13 Shifting case 14 Traveling hydraulic pump 15 Working hydraulic pump 20 Swash plate control circuit 30 PTO clutch valve 33 Bypass valve

Claims (1)

クローラ式走行部、キャビンで覆われ、運転席が設けられる操作部を備えて構成された作業用走行車において、アッシーベースとなる作業動力変速用のPTO変速ケースの上部に走行用油圧ポンプを、前部に作業用油圧ポンプをそれぞれ一体的に組付けて変速・油圧アッシーを構成し、該変速・油圧アッシーを前記運転席の下方スペースに配置したものに作業関連および走行関連の油圧バルブを設けるにあたり、該作業関連の油圧バルブは、作業用油圧ポンプからの油圧でPTO変速ケース内のPTOクラッチ機構を入切するPTOクラッチバルブであり、走行関連の油圧バルブは、走行用油圧ポンプの相反する斜板制御用油路を連通させるバイパスバルブであり、これら油圧バルブを前記変速・油圧アッシーの上部に一体的に組付けたことを特徴とする作業用走行車。 In a working vehicle configured to include a crawler type traveling unit, an operation unit that is covered with a cabin and provided with a driver's seat , a traveling hydraulic pump is provided on the upper part of a PTO transmission case for working power transmission serving as an assembly base . each working hydraulic pump to the front constitute the transmission and hydraulic assemblies are assembled integrally, the speed change and hydraulic assemblies providing work-related and the travel-related hydraulic valves to those located below the space of the driver's seat In this case, the work-related hydraulic valve is a PTO clutch valve that turns on and off the PTO clutch mechanism in the PTO transmission case with the hydraulic pressure from the work hydraulic pump, and the travel-related hydraulic valve conflicts with the travel hydraulic pump. a bypass valve for communicating the swash plate control oil passage, that the integrally assembled these hydraulic valve on top of the shift and hydraulic assemblies Work for the traveling vehicle and features.
JP27988899A 1999-09-30 1999-09-30 Working vehicle Expired - Fee Related JP4316068B2 (en)

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JP4316068B2 true JP4316068B2 (en) 2009-08-19

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Publication number Priority date Publication date Assignee Title
JP4643160B2 (en) * 2004-03-16 2011-03-02 ヤンマー株式会社 Control valve device for work vehicle
EP1757834A4 (en) 2004-03-16 2008-07-16 Yanmar Co Ltd Hydraulic valve device for working vehicle
JP4521234B2 (en) * 2004-08-24 2010-08-11 ヤンマー株式会社 Work vehicle

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