JP5444080B2

JP5444080B2 - Crawler travel device

Info

Publication number: JP5444080B2
Application number: JP2010076230A
Authority: JP
Inventors: 和真石原; 基成稲岡; 小林　　孝
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2010-03-29
Filing date: 2010-03-29
Publication date: 2014-03-19
Anticipated expiration: 2030-03-29
Also published as: JP2011207316A

Description

本発明は、ゴム材からなるベルト本体に芯金をベルト周方向に一定ピッチで埋設するとともに、各芯金のベルト幅方向中間部位からベルト内周面側に転輪案内用の左右一対の芯金突起を突設してあるクローラベルトと、そのクローラベルトにベルト周方向での回転動力を付与する駆動スプロケットとを備えたクローラ走行装置に関する。 The present invention embeds a cored bar in a belt body made of a rubber material at a constant pitch in the circumferential direction of the belt, and a pair of left and right cores for rolling guide from the intermediate part in the belt width direction of each cored bar to the inner peripheral surface of the belt. The present invention relates to a crawler traveling device including a crawler belt provided with a gold protrusion and a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction.

この種のクローラ走行装置では、クローラベルトの周方向で一定ピッチで埋設された芯金同士の間におけるゴム製のベルト本体部分に、ベルト周方向よりもベルト幅方向に長く形成された係合用凹部を設け、前記クローラベルトを駆動する駆動スプロケットには、前記係合用凹部の長手方向と同じ方向に長く形成された駆動爪体を備えさせている。つまり、駆動爪体と係合用凹部との係合箇所における接触面積を大きくすることにより、クローラベルトのゴム製のベルト本体に対して駆動爪体側から大きな駆動力を伝えられるようにした構造のものが知られている（特許文献１参照）。 In this type of crawler travel device, a concave portion for engagement formed in a rubber belt main body portion between core bars embedded at a constant pitch in the circumferential direction of the crawler belt is longer in the belt width direction than in the belt circumferential direction. The drive sprocket that drives the crawler belt is provided with a drive claw body that is formed long in the same direction as the longitudinal direction of the recess for engagement. In other words, by increasing the contact area at the engagement location between the drive claw body and the engagement recess, a structure that allows a large drive force to be transmitted from the drive claw body side to the rubber belt body of the crawler belt. Is known (see Patent Document 1).

特開２００９−７８７９６号公報（段落〔００３１〕、〔００４１〕、図１、図２、図３、図５、図６）JP 2009-78796 A (paragraphs [0031], [0041], FIG. 1, FIG. 2, FIG. 3, FIG. 5, FIG. 6)

上記のクローラ走行装置では、クローラベルトのベルト幅方向で長く形成された係合用凹部、及び同じ方向に長く形成された駆動爪体を備えた駆動スプロケットを用いることによって、駆動爪体と係合用凹部との接触面積を大きくしている。このように、駆動爪体と係合用凹部との接触面積を大きくすることにより、ゴム製のベルト本体部分に形成される係合用凹部の接触面に作用する駆動爪体側からの面圧をできるだけ低減させられるように工夫しているが、この構造によれば次のような問題がある。 In the above crawler traveling device, the driving claw body and the engaging crevice are formed by using a driving sprocket provided with an engaging recess formed long in the belt width direction of the crawler belt and a driving claw body formed long in the same direction. The contact area is increased. Thus, by increasing the contact area between the drive claw body and the engagement recess, the surface pressure from the drive claw body acting on the contact surface of the engagement recess formed on the rubber belt main body portion is reduced as much as possible. However, this structure has the following problems.

すなわち、このように、ベルト本体部分に形成された係合用凹部に、その係合用凹部の長手方向と同じ方向に長く形成された駆動爪体を係合させて動力伝達を行う構造のものでは、クローラベルトと駆動スプロケットとのベルト幅方向での位置ずれを抑制する機能を備えていない。
このため、機体進行方向での左右方向が傾斜した路面である場合などに、クローラベルトと駆動スプロケットとのベルト幅方向での位置ずれが生じ、ベルト本体部分に形成された係合用凹部と駆動爪体とがうまく係合されない事態が生じる可能性がある。
これを回避するために、例えば駆動爪体の左右方向幅よりも係合用凹部のベルト幅方向での寸法を十分余裕のある大きさに設定して係合し易くすることが考えられる。しかしながら、そのように係合用凹部のベルト幅方向寸法を大きくすると、駆動爪体が係合用凹部内においてベルト幅方向でのどの位置で係合するかが安定せず、結局駆動爪体が係合用凹部の一端側に寄って外れやすくなったり、無用にベルト幅方向で長くなる係合用凹部の存在によってクローラベルトの強度が低減するという問題がある。 That is, in such a structure that transmits power by engaging a driving claw body formed long in the same direction as the longitudinal direction of the engaging recess with the engaging recess formed in the belt main body portion, The crawler belt and the drive sprocket are not provided with a function of suppressing the positional deviation in the belt width direction.
For this reason, when the left and right direction in the traveling direction of the airframe is an inclined road surface, the crawler belt and the drive sprocket are displaced in the belt width direction, and the engagement recesses and the drive claws formed in the belt main body portion. There may be situations where the body does not engage well.
In order to avoid this, for example, it is conceivable that the dimension of the engaging recess in the belt width direction is set to a sufficiently large size rather than the lateral width of the driving claw body to facilitate engagement. However, when the dimension in the belt width direction of the engaging recess is increased in this way, it is not stable at which position in the belt width direction the drive claw body is engaged in the engagement recess, and the drive claw body is eventually engaged. There is a problem that the strength of the crawler belt is reduced due to the presence of an engagement recess that becomes unnecessarily long in the width direction of the belt because it tends to come close to one end side of the recess.

本発明の目的は、クローラベルトと駆動スプロケットとのベルト幅方向での位置ずれを抑制して、クローラベルトの係合用凹部と駆動スプロケットの駆動爪体との係合を行い易くするとともに、駆動爪体と係合用凹部との噛み合い状態を良好に維持して駆動力の伝達が良好に行われるようにしたクローラ走行装置を提供することにある。 It is an object of the present invention to suppress the displacement of the crawler belt and the drive sprocket in the belt width direction so that the engagement recess of the crawler belt and the drive claw body of the drive sprocket can be easily engaged. It is an object of the present invention to provide a crawler traveling device that maintains a good meshing state between a body and a recess for engagement so that a driving force can be transmitted satisfactorily.

上記目的を達成するために講じた本発明の技術手段は、次の点に構成上の特徴、及び作用効果がある。
〔解決手段１〕
ゴム材からなるベルト本体に芯金をベルト周方向に一定ピッチで埋設するとともに、各芯金のベルト幅方向中間部位からベルト内周面側に転輪案内用の左右一対の芯金突起を突設してあるクローラベルトと、そのクローラベルトにベルト周方向での回転動力を付与する駆動スプロケットとを備え、
前記クローラベルトの内周面側に駆動スプロケットの駆動爪体と係合する係合用凹部を備え、この係合用凹部は、ベルト周方向での芯金同士の間に位置し、
前記駆動スプロケットは、左右の芯金突起との間に嵌り込む円盤状部材の外周側に、周方向での所定間隔毎に前記クローラベルトに形成された係合用凹部に係入する駆動爪体を備えたクローラ走行装置であって、
前記駆動スプロケットの円盤状部材は、左右の芯金突起の間に入り込む外周側に、左右方向での幅が左右の芯金突起の内端側の間隔よりも幅狭で、かつ芯金突起に対する駆動スプロケットの前記左右方向での所定以上の相対位置変化に伴って前記芯金突起の内端側の面に接当するように形成されたリブ部を備え、
前記リブ部の左右方向の端縁と前記芯金突起の内端側の面は、お互いに接当する接当箇所が前記円盤状部材の半径方向で点接触となるように構成してあり、
前記リブ部の外周面側には、その外周面側に付着する泥土を、リブ部の左右方向での外方側へ案内する傾斜面を形成してあることを特徴とする。 The technical means of the present invention taken in order to achieve the above object has the following structural features and operational effects.
[Solution 1]
The cored bar is embedded in the belt body made of rubber material at a constant pitch in the belt circumferential direction, and a pair of left and right cored bar projections for rolling guides project from the intermediate part in the belt width direction of each cored bar to the belt inner peripheral surface side. A crawler belt provided, and a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction,
The crawler belt has an engagement recess that engages with the drive claw of the drive sprocket on the inner peripheral surface side, and the engagement recess is located between the core bars in the belt circumferential direction,
The drive sprocket has drive claws that engage with engagement recesses formed in the crawler belt at predetermined intervals in the circumferential direction on the outer peripheral side of a disk-like member fitted between the left and right cored bar projections. A crawler traveling device equipped with,
The disk-shaped member of the drive sprocket has a width in the left-right direction narrower than an interval between the inner ends of the left and right cored bar projections on the outer peripheral side that enters between the left and right cored bar projections, and is against the cored bar projections. A rib portion formed so as to come into contact with the inner end surface of the cored bar projection in accordance with a change in the relative position of the drive sprocket in the left-right direction over a predetermined amount;
The edge part in the left-right direction of the rib part and the inner end side surface of the cored bar protrusion are configured such that contact points contacting each other are point contacts in the radial direction of the disk-shaped member,
An inclined surface is formed on the outer peripheral surface side of the rib portion to guide the mud adhering to the outer peripheral surface side to the outer side in the left-right direction of the rib portion.

〔解決手段２〕
上記目的を達成するために講じた本発明の技術手段は、ゴム材からなるベルト本体に芯金をベルト周方向に一定ピッチで埋設するとともに、各芯金のベルト幅方向中間部位からベルト内周面側に転輪案内用の左右一対の芯金突起を突設してあるクローラベルトと、そのクローラベルトにベルト周方向での回転動力を付与する駆動スプロケットとを備え、
前記クローラベルトの内周面側に駆動スプロケットの駆動爪体と係合する係合用凹部を備え、この係合用凹部は、ベルト周方向での芯金同士の間に位置し、
前記駆動スプロケットは、左右の芯金突起との間に嵌り込む円盤状部材の外周側に、周方向での所定間隔毎に前記クローラベルトに形成された係合用凹部に係入する駆動爪体を備えたクローラ走行装置であって、
前記駆動スプロケットの円盤状部材は、左右の芯金突起の間に入り込む外周側に、左右方向での幅が左右の芯金突起の内端側の間隔よりも幅狭で、かつ芯金突起に対する駆動スプロケットの前記左右方向での所定以上の相対位置変化に伴って前記芯金突起の内端側の面に接当するように形成されたリブ部を備え、
前記リブ部の外周面側には、その外周面側に付着する泥土を、リブ部の左右方向での外方側で且つ前記円盤状部材の半径方向内方側へ案内する傾斜面を形成してあり、
前記芯金突起は、ベルト周方向で下端側部位から上端側部位に向けて徐々に幅狭となる形状に形成してあり、
前記リブ部の外周面側に形成される傾斜面において前記円盤状部材の半径方向で最も外方側に位置する部位は、前記駆動爪体が前記係合用凹部に係合した状態において、前記左右の芯金突起の横外側箇所に形成された転輪軌道面よりも前記円盤状部材の半径方向で内方側に位置していることを特徴とする。
〔解決手段３〕
上記目的を達成するために講じた本発明の技術手段は、ゴム材からなるベルト本体に芯金をベルト周方向に一定ピッチで埋設するとともに、各芯金のベルト幅方向中間部位からベルト内周面側に転輪案内用の左右一対の芯金突起を突設してあるクローラベルトと、そのクローラベルトにベルト周方向での回転動力を付与する駆動スプロケットとを備え、
前記クローラベルトの内周面側に駆動スプロケットの駆動爪体と係合する係合用凹部を備え、この係合用凹部は、ベルト周方向での芯金同士の間に位置し、
前記駆動スプロケットは、左右の芯金突起との間に嵌り込む円盤状部材の外周側に、周方向での所定間隔毎に前記クローラベルトに形成された係合用凹部に係入する駆動爪体を備えたクローラ走行装置であって、
前記駆動スプロケットの円盤状部材は、左右の芯金突起の間に入り込む外周側に、左右方向での幅が左右の芯金突起の内端側の間隔よりも幅狭で、かつ芯金突起に対する駆動スプロケットの前記左右方向での所定以上の相対位置変化に伴って前記芯金突起の内端側の面に接当するように形成されたリブ部を備え、
前記リブ部の外周面側には、その外周面側に付着する泥土を、リブ部の左右方向での外方側へ案内する傾斜面を形成し、
前記リブ部は、前記円盤状部材の厚み方向での厚みが前記円盤状部材の半径方向で内方側の内方部位よりも肉厚に構成してあり、
前記係合用凹部の入り口側端部は、ベルト幅方向の右端部が右側の前記芯金突起の右下端よりも右横側に張り出し、ベルト幅方向の左端部が左側の前記芯金突起の左下端よりも左側に張り出し、
前記駆動爪体は、前記係合用凹部に係合した状態において、前記駆動爪体の左右方向の右端部が前記円盤状部材から前記芯金突起に重複する位置まで張り出し、前記駆動爪体の左右方向の左端部が前記円盤状部材から前記芯金突起に重複する位置まで張り出していることを特徴とする。 [Solution 2]
The technical means of the present invention devised to achieve the above object is to embed a core metal in a belt body made of a rubber material at a constant pitch in the belt circumferential direction, and from the belt width direction intermediate portion of each core metal to the belt inner periphery. A crawler belt having a pair of left and right cored bar projections for guiding a wheel on the surface side, and a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction,
The crawler belt has an engagement recess that engages with the drive claw of the drive sprocket on the inner peripheral surface side, and the engagement recess is located between the core bars in the belt circumferential direction,
The drive sprocket has drive claws that engage with engagement recesses formed in the crawler belt at predetermined intervals in the circumferential direction on the outer peripheral side of a disk-like member fitted between the left and right cored bar projections. A crawler traveling device equipped with,
The disk-shaped member of the drive sprocket has a width in the left-right direction narrower than an interval between the inner ends of the left and right cored bar projections on the outer peripheral side that enters between the left and right cored bar projections, and is against the cored bar projections. A rib portion formed so as to come into contact with the inner end surface of the cored bar projection in accordance with a change in the relative position of the drive sprocket in the left-right direction over a predetermined amount;
On the outer peripheral surface side of the rib portion, an inclined surface is formed that guides mud adhering to the outer peripheral surface side to the outer side in the left-right direction of the rib portion and to the inner side in the radial direction of the disk-shaped member. And
The core metal protrusion is formed in a shape that gradually becomes narrower from the lower end side portion toward the upper end side portion in the belt circumferential direction,
In the inclined surface formed on the outer peripheral surface side of the rib portion, the portion located on the outermost side in the radial direction of the disk-shaped member is the left and right sides in a state where the drive claw body is engaged with the engaging recess. It is characterized in that it is located on the inner side in the radial direction of the disk-like member with respect to the raceway surface formed on the laterally outer side of the core metal projection.
[Solution 3]
The technical means of the present invention devised to achieve the above object is to embed a core metal in a belt body made of a rubber material at a constant pitch in the belt circumferential direction, and from the belt width direction intermediate portion of each core metal to the belt inner periphery. A crawler belt having a pair of left and right cored bar projections for guiding a wheel on the surface side, and a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction,
The crawler belt has an engagement recess that engages with the drive claw of the drive sprocket on the inner peripheral surface side, and the engagement recess is located between the core bars in the belt circumferential direction,
The drive sprocket has drive claws that engage with engagement recesses formed in the crawler belt at predetermined intervals in the circumferential direction on the outer peripheral side of a disk-like member fitted between the left and right cored bar projections. A crawler traveling device equipped with,
The disk-shaped member of the drive sprocket has a width in the left-right direction narrower than an interval between the inner ends of the left and right cored bar projections on the outer peripheral side that enters between the left and right cored bar projections, and is against the cored bar projections. A rib portion formed so as to come into contact with the inner end surface of the cored bar projection in accordance with a change in the relative position of the drive sprocket in the left-right direction over a predetermined amount;
On the outer peripheral surface side of the rib portion, an inclined surface that guides the mud adhering to the outer peripheral surface side to the outer side in the left-right direction of the rib portion is formed,
The rib portion is configured such that the thickness in the thickness direction of the disc-shaped member is thicker than the inner portion on the inner side in the radial direction of the disc-shaped member,
As for the entrance side end of the engaging recess, the right end in the belt width direction protrudes to the right side of the right lower end of the right core metal projection, and the left end in the belt width direction is the lower left of the left core metal projection. Overhang to the left of the edge,
When the drive claw body is engaged with the engagement recess, the right end portion of the drive claw body protrudes from the disk-like member to a position overlapping the core metal protrusion, and the left and right sides of the drive claw body The left end portion of the direction protrudes from the disk-like member to a position overlapping the core metal protrusion.

〔解決手段１〜３にかかる発明の作用及び効果〕
そして、駆動スプロケットの円盤状部材は、左右の芯金突起の間に入り込む外周側に、左右方向での幅が左右の芯金突起の内端側の間隔よりも幅狭で、かつ芯金突起に対する駆動スプロケットの前記左右方向での所定以上の相対位置変化に伴って前記芯金突起の内端側の面に接当するように形成されたリブ部を備えている。これによって、駆動スプロケット側の駆動爪体とクローラベルト側の係合用凹部との、ベルト幅方向での所定以上の位置ずれを、前記リブ部の存在によって制限し、係合用凹部と駆動爪体とがベルト幅方向に大きく位置ずれして係合されなくなるような事態を回避することができる利点がある。 [ Operations and effects of the invention according to Solution 1 to 3 ]
The disk-shaped member of the drive sprocket has a width in the left-right direction narrower than an interval between the inner ends of the left and right core metal protrusions on the outer peripheral side that enters between the left and right core metal protrusions, and the core metal protrusions And a rib portion formed so as to come into contact with the inner end surface of the cored bar projection in accordance with a change in the relative position of the driving sprocket with respect to the left-right direction. Thus, the displacement of the driving sprocket side driving claw body and the crawler belt side engaging concave portion in the belt width direction is limited by the presence of the rib portion, and the engaging concave portion, the driving claw body, There is an advantage that it is possible to avoid a situation in which the belt is greatly displaced in the belt width direction and is not engaged.

上記のように駆動スプロケットの円盤状部材の外周側形成されたリブ部は、駆動爪体と係合用凹部との位置ずれを抑制できるようにするためには有用なものである。ところが、円盤状部材の外周側に左右方向幅の広いリブ部が形成されると、このリブ部の外周面側で、円盤状部材の周方向の前後に位置する駆動爪体との間に、走行路面の粘着質の泥土が付着してクローラベルトとの接触で圧縮され、容易に脱落しなくなって堆積することがある。
そうすると、駆動スプロケット側の円盤状部材の外周径が実質的に大きくなった状態となり、相対的に駆動爪体の外方側への突出量が小さくなって、係合用凹部との係合代が少なくなるため、大きな負荷が作用すると駆動爪体と係合用凹部との係合が外れて駆動力が伝わり難くなる虞がある。 As described above, the rib portion formed on the outer peripheral side of the disk-shaped member of the drive sprocket is useful in order to suppress the displacement between the drive claw body and the engagement recess. However, when a wide rib portion in the left-right direction is formed on the outer peripheral side of the disc-shaped member, between the driving claw bodies located on the outer peripheral surface side of the rib portion and the front and rear in the circumferential direction of the disc-shaped member, Adhesive mud on the road surface may adhere and be compressed by contact with the crawler belt, and may not easily fall off and accumulate.
As a result, the outer diameter of the disk-shaped member on the drive sprocket side is substantially increased, the amount of protrusion of the drive claw body toward the outer side is relatively reduced, and the engagement margin with the engagement recess is reduced. Therefore, when a large load is applied, the engagement between the drive claw body and the engagement recess may be disengaged and the drive force may not be transmitted.

この発明では、前記リブ部の外周面側に、その外周面側に付着する泥土を、リブ部の左右方向での外方側へ案内する傾斜面を形成したので、リブ部の外周面側に付着した泥土が、クローラベルトとの接触で圧縮されると、その傾斜面に沿って左右方向での外方側へ排出される。
したがって、リブ部の外周面側に泥土が付着堆積することを回避し、駆動爪体と係合用凹部との係合を確実に行わせて、駆動力の伝達が良好に行われるクローラ走行装置を得られる利点がある。 In this invention, an inclined surface is formed on the outer peripheral surface side of the rib portion to guide the mud adhering to the outer peripheral surface side to the outer side in the left-right direction of the rib portion. When the adhering mud is compressed by contact with the crawler belt, it is discharged to the outer side in the left-right direction along the inclined surface.
Therefore, a crawler traveling device that avoids adhesion and accumulation of mud on the outer peripheral surface side of the rib portion, reliably engages the driving claw body and the engaging concave portion, and transmits the driving force satisfactorily. There are benefits to be gained.

〔解決手段４〕
上記課題を解決するために講じた本発明の他の技術手段は、前記係合用凹部は、ベルト周方向に並設された前記芯金の左右それぞれのベルト周方向で前記芯金突起同士の間に位置してあり、ベルト幅方向において右側の前記芯金突起に隣接する右端面と左側の前記芯金突起に隣接する左端面との間隔が、ベルト周方向での端面同士の間隔よりも長く形成され、
前記駆動爪体は、前記円盤状部材の左右方向へ張り出し、前記円盤状部材の左右方向において前記円盤状部材から右横側に張り出した右端面と前記円盤状部材から左横側に張り出した左端面との間隔が前記円盤状部材の周方向での端面同士の間隔よりも長く形成されている点に特徴がある。 [Solution 4 ]
Another technical means of the present invention taken in order to solve the above-described problems is that the recess for engagement is between the core metal protrusions in the belt circumferential direction on each of the left and right sides of the core metal arranged side by side in the belt circumferential direction. The distance between the right end surface adjacent to the right core metal protrusion and the left end surface adjacent to the left core metal protrusion in the belt width direction is longer than the distance between the end surfaces in the belt circumferential direction. Formed,
The drive claw projects in the left-right direction of the disc-shaped member, and a right end surface that projects from the disc-shaped member to the right side in the left-right direction of the disc-shaped member and a left end that projects from the disc-shaped member to the left side It is characterized in that the distance from the surface is longer than the distance between the end faces in the circumferential direction of the disk-shaped member .

〔解決手段５〕
上記課題を解決するために講じた本発明の他の技術手段は、リブ部の外周面側に形成される傾斜面は、そのリブ部の左右両側へ振り分けて泥土を排出するように、リブ部の左右方向での中央側が円盤状部材の半径方向外方側に位置し、左右両側が半径方向内方側に位置する山形に形成されていることである。 [Solution 5 ]
Another technical means of the present invention taken to solve the above problems is that the inclined surface formed on the outer peripheral surface side of the rib portion is distributed to the left and right sides of the rib portion to discharge mud. Is formed in a mountain shape in which the center side in the left-right direction is located on the radially outer side of the disk-shaped member, and both left and right sides are located on the radially inner side.

〔解決手段５にかかる発明の作用及び効果〕
上記の解決手段５で示した構成によると、リブ部の外周面側に形成される傾斜面が、リブ部の左右方向での中央側が円盤状部材の半径方向外方側に位置し、左右両側が半径方向内方側に位置する山形に形成されているので、リブ部の外周面側に付着する泥土を左右方向へ排出するに際して、左右方向での排出距離が短く、左右両側へスムースな泥土の排出を行うことができる。 [Operation and effect of invention according to Solution 5 ]
According to the configuration shown in the solution means 5 described above, the inclined surface formed on the outer peripheral surface side of the rib portion is such that the center side in the left-right direction of the rib portion is located on the radially outer side of the disk-shaped member, Is formed in the shape of a mountain located on the inner side in the radial direction. Can be discharged.

トラクタの全体側面図である。It is the whole tractor side view. クローラ走行装置の全体側面図である。It is the whole crawler traveling device side view. クローラベルトの平面図である。It is a top view of a crawler belt. 図３におけるIV-IV線断面図である。It is the IV-IV sectional view taken on the line in FIG. クローラベルトのベルト周方向での部分断面図である。It is a fragmentary sectional view in the belt peripheral direction of a crawler belt. 芯金突起部分を示す概略斜視図である。It is a schematic perspective view which shows a core metal protrusion part. 駆動スプロケットの一部を示す斜視図である。It is a perspective view which shows a part of drive sprocket. 駆動スプロケットの外周部分を示す側面図である。It is a side view which shows the outer peripheral part of a drive sprocket. 図８におけるIX-IX線断面図である。It is the IX-IX sectional view taken on the line in FIG. 図８における矢視図である。It is an arrow view in FIG. 駆動爪体と係合用凹部及び芯金突起との関係を示す説明図であり、（ａ）は駆動爪体が係合用凹部の端部に位置する状態を示し、（ｂ）は駆動爪体のリブ部が芯金突起に接当した状態を示す。It is explanatory drawing which shows the relationship between a drive nail | claw body, the recessed part for engagement, and a metal core protrusion, (a) shows the state which a drive claw body is located in the edge part of the recessed part for engagement, (b) is a drive claw body. The rib part is in contact with the cored bar protrusion. 駆動爪体と係合用凹部及び芯金突起との関係を示す説明図である。It is explanatory drawing which shows the relationship between a drive nail | claw body, the recessed part for engagement, and a metal core protrusion. 駆動スプロケットのリブ部と芯金突起との関係を示す説明図である。It is explanatory drawing which shows the relationship between the rib part of a drive sprocket, and a core metal protrusion. 駆動スプロケットとクローラベルトとの係合部を示す側面図である。It is a side view which shows the engaging part of a drive sprocket and a crawler belt. 別実施形態における駆動スプロケットの一部を示す斜視図である。It is a perspective view which shows a part of drive sprocket in another embodiment. 別実施形態における駆動スプロケットの一部を示す断面図である。It is sectional drawing which shows a part of drive sprocket in another embodiment. 別実施形態における駆動スプロケットの一部を示す平面図である。It is a top view which shows a part of drive sprocket in another embodiment. 別実施形態における駆動スプロケットの一部を示し、（ａ）は斜視図、（ｂ）はｂ−ｂ線断面図である。A part of drive sprocket in another embodiment is shown, (a) is a perspective view and (b) is a bb line sectional view.

以下、本発明の実施の形態の一例を図面の記載に基づいて説明する。
〔トラクタの全体構成〕
図１は、本発明に係るクローラ走行装置２を機体後部側に設けたセミクローラ型トラクタを示す。このセミクローラ型トラクタは、４輪駆動型のトラクタをセミクローラ型に仕様変更したものであり、キャビン付きのトラクタ本機１の前部に操向可能な左右一対の前輪１０を備えるとともに、機体後部に主推進装置として左右一対のクローラ走行装置２を備えて構成されている。また、機体後部には、図示しない三点リンク機構を介して耕耘装置や収穫装置、あるいは各種の中間管理用の作業装置を連結するように構成されている。 Hereinafter, an example of an embodiment of the present invention will be described based on the drawings.
[Overall structure of tractor]
FIG. 1 shows a semi-crawler type tractor provided with a crawler traveling device 2 according to the present invention on the rear side of the machine body. This semi-crawler type tractor is a four-wheel drive type tractor with a specification change to a semi-crawler type, and includes a pair of left and right front wheels 10 that can be steered at the front of the tractor with a cabin 1 and at the rear of the fuselage. The main propulsion device includes a pair of left and right crawler traveling devices 2. Further, the rear portion of the machine body is configured to connect a tilling device, a harvesting device, or various intermediate management working devices via a three-point link mechanism (not shown).

〔クローラ走行装置〕
図１，２に示すように、前記クローラ走行装置２は、トラクタ本機１における後部ミッションケース１１に後輪駆動用として備えられた後車軸１２に連結した大径の駆動スプケット３を備えている。
この駆動スプロケット３と、トラックフレーム２０の前後に備えられたアイドラホィール４，４、およびトラックフレーム２０の長手方向に並列配備された複数の転輪５に亘ってクローラベルト６を巻回張設して、前記駆動スプロケット３が、前後のアイドラホィール４，４の中間位置で、かつ前記転輪５の上方側箇所に位置するように設けられている。
このクローラ走行装置２の左右方向のトレッドは、畑地における畝の間を走行するために前輪１０のトレッドとほぼ同一に設定されている。 [Crawler traveling device]
As shown in FIGS. 1 and 2, the crawler travel device 2 includes a large-diameter drive spcket 3 connected to a rear axle 12 provided for driving rear wheels in a rear transmission case 11 of the tractor main unit 1. .
The crawler belt 6 is wound around the drive sprocket 3, the idler wheels 4, 4 provided before and after the track frame 20, and a plurality of rollers 5 arranged in parallel in the longitudinal direction of the track frame 20. Thus, the drive sprocket 3 is provided at an intermediate position between the front and rear idler wheels 4 and 4 and at an upper position of the wheel 5.
The tread in the left-right direction of the crawler traveling device 2 is set to be substantially the same as the tread of the front wheel 10 in order to travel between the fences in the field.

図２に示すように、前記転輪５は前後方向に３個が並設され、最前端側の転輪５はトラックフレーム２０に対して固定ブラケット２１を介して位置固定状態に取り付けてある。
そして、その後方側の２個の転輪５，５は、前記トラックフレーム２０に取り付けられた支持ブラケット２２に対して、中間部を横軸心ｘ周りで上下揺動自在に枢着された天秤状部材２３の両端側に振り分け配置してあり、シーソー揺動自在に構成されている。 As shown in FIG. 2, three rolling wheels 5 are arranged in parallel in the front-rear direction, and the foremost rolling wheel 5 is attached to a track frame 20 via a fixing bracket 21 in a fixed position.
The two wheels 5 and 5 on the rear side of the balance 5 are pivotally attached to the support bracket 22 attached to the track frame 20 so that the middle part thereof is swingable up and down around the horizontal axis x. The members 23 are arranged at both ends of the member 23 so as to be able to swing the seesaw.

上記各転輪５とクローラベルト６とがベルト横幅方向で所定の位置関係を保ち、かつ転輪５からクローラベルト６が外れることを防止するための外れ止めガイド７が、前後２箇所で横向き支点ｐ周りで前後揺動自在に設けてある。
前側の外れ止めガイド７は、最前端の転輪５を固定支持する固定ブラケット２１の下端側に連設してあり、後側の外れ止めガイド７は、天秤状部材２３の下端側で、最後端位置の転輪５の前後にわたる状態で連設してある。 Each of the rolling wheels 5 and the crawler belt 6 maintains a predetermined positional relationship in the belt lateral width direction, and a detachment prevention guide 7 for preventing the crawler belt 6 from coming off from the rolling wheels 5 has two lateral fulcrums. It is provided so that it can swing back and forth around p.
The front-side locking guide 7 is connected to the lower end side of the fixing bracket 21 that fixes and supports the frontmost roller 5, and the rear-side locking guide 7 is the last side of the balance-like member 23. It is continuously provided in a state extending before and after the wheel 5 at the end position.

〔クローラベルト〕
前記クローラベルト６は、図３乃至図６に示すように構成されている。
このクローラベルト６は、ゴム材で無端帯状に成形されたベルト本体６０に芯金６１がベルト周方向に一定ピッチで埋設されているとともに、各芯金６１の間におけるベルト内周面側に、駆動スプロケット３の駆動爪体３１が係入してクローラベルト６側へ動力を伝えるための係合用凹部６２が形成されている。 [Crawler belt]
The crawler belt 6 is configured as shown in FIGS.
The crawler belt 6 has a core body 61 embedded in a belt body 60 formed in an endless belt shape with a rubber material at a constant pitch in the belt circumferential direction, and on the inner peripheral surface side of the belt between the core bars 61. An engaging recess 62 for engaging the driving claw body 31 of the driving sprocket 3 and transmitting power to the crawler belt 6 side is formed.

この係合用凹部６２は、図３、図５、及び図１１に示すように、ベルト周方向での芯金６１同士の間に位置して、かつベルト周方向よりもベルト幅方向に長く形成されている。そして、この係合用凹部６２のベルト幅方向での両端側の端面６２ａは、図１１（ａ）に示すように、クローラベルト６が水平面上に位置する状態で、その水平面に対して垂直ではなく、所定のベルト傾斜角度β（水平面に対する傾斜角度に相当）を有した傾斜面によって形成してある。
そして、このようにベルト傾斜角度βを有した傾斜面である端面６２ａがベルト幅方向の両端側に形成された係合用凹部６２は、その左右両側の端面６２ａによって内奥側（図中下方側）ほど幅狭となるテーパー面に形成されている。 As shown in FIGS. 3, 5, and 11, the engaging recess 62 is located between the core bars 61 in the belt circumferential direction and is formed longer in the belt width direction than in the belt circumferential direction. ing. The end surfaces 62a on both ends of the engaging recess 62 in the belt width direction are not perpendicular to the horizontal plane when the crawler belt 6 is positioned on the horizontal plane as shown in FIG. And an inclined surface having a predetermined belt inclination angle β (corresponding to an inclination angle with respect to a horizontal plane).
The engaging recesses 62 in which the end surfaces 62a, which are inclined surfaces having the belt inclination angle β, are formed on both end sides in the belt width direction as described above are formed on the inner back side (the lower side in the figure) by the end surfaces 62a on both the left and right sides. ) Is formed on a tapered surface that becomes narrower.

また、係合用凹部６２のベルト周方向での端面は、その係合用凹部６２に係入する駆動爪体３１の前向き面３１ｂ（接触面の一例）もしくは後向き面３１ｃ（接触面の一例）と係合して、駆動スプロケット３の駆動力をクローラベルト６へ伝達するための、駆動爪体３１との接触面としての前向き端面６２ｂ、及び後向き端面６２ｃを構成している。 Further, the end surface of the engaging recess 62 in the belt circumferential direction is engaged with the front surface 31 b (an example of a contact surface) or the rear surface 31 c (an example of a contact surface) of the drive claw body 31 engaged with the engagement recess 62. In combination, a forward end face 62b and a rearward end face 62c as contact surfaces with the drive claw body 31 for transmitting the driving force of the drive sprocket 3 to the crawler belt 6 are configured.

各芯金６１は、図３及び図４に示すように、ベルト幅方向中間部位からベルト内周面側に向けて転輪案内用の左右一対の芯金突起６３が突設され、この芯金突起６３の間を駆動スプロケット３および前後のアイドラホィール４，４が通過するよう構成されている。
また、各芯金突起６３の横外側箇所に位置するベルト本体６０の内周面には転輪５が転動移動する偏平な転輪軌道面６４が形成されるとともに、ベルト本体６０の外周面側には、ベルト周方向で前記係合用凹部６２と表裏で重複する位置に、芯金突起６３部分を除くベルト本体６０の厚さより厚い推進ラグ６５が一体に突出形成されている。 As shown in FIGS. 3 and 4, each cored bar 61 is provided with a pair of left and right cored bar projections 63 for guiding a wheel from the intermediate part in the belt width direction toward the inner peripheral surface of the belt. The drive sprocket 3 and the front and rear idler wheels 4, 4 are configured to pass between the protrusions 63.
In addition, a flat roller raceway surface 64 on which the rolling wheels 5 roll is formed on the inner peripheral surface of the belt main body 60 located at the laterally outer side of each cored bar protrusion 63, and the outer peripheral surface of the belt main body 60. On the side, a propulsion lug 65 thicker than the thickness of the belt main body 60 excluding the cored bar projection 63 is integrally formed at a position overlapping the engaging recess 62 in the belt circumferential direction.

前記芯金６１と前記係合用凹部６２との間におけるベルト本体６０の内周面側には、図３乃至図６に示すように、係合用凹部６２に係入した駆動スプロケット３の駆動爪体３１の駆動力を芯金６１に伝えるための受圧用ブロック部６６が設けられている。つまり、係合用凹部６２に入り込んだ金属製の駆動爪体３１によってゴム製の受圧用ブロック部６６が圧縮作用を受けながら金属製の芯金６１に駆動力を伝えるように構成されているものであり、駆動爪体３１と芯金６１との金属同士の直接の接触を避けて騒音の発生を回避できるようにしている。 On the inner peripheral surface side of the belt main body 60 between the core bar 61 and the engagement recess 62, as shown in FIGS. 3 to 6, the drive claw body of the drive sprocket 3 engaged in the engagement recess 62 A pressure receiving block 66 for transmitting the driving force of 31 to the cored bar 61 is provided. In other words, the rubber pressure receiving block portion 66 is configured to transmit a driving force to the metal core bar 61 while receiving a compression action by the metal driving claw body 31 entering the engaging recess 62. Yes, it is possible to avoid the occurrence of noise by avoiding direct contact between the metal of the driving claw body 31 and the cored bar 61.

前記芯金突起６３は、図４乃至図６に示すように、芯金６１の一部に一体形成されたベルト内周面側へ突出する金属製の突起部分６１ａを、ベルト本体６０を構成するゴム材からなる山形突起部６７で覆うことによって外形形状がほぼ山形状に形成されている。
つまり、芯金突起６３は、図４に示すベルト幅方向でも、図５に示すベルト周方向でも、断面視で山形状に形成されている。そして、図６に示すように、芯金突起６３のベルト幅方向での内方側に向く面が、アイドラホィール４や外れ止めガイド７に対する案内面Ｃとなる傾斜面によって形成されている。
また、この山形状の芯金突起６３は、その頂部６３ａが、ベルト周方向に沿う部分とその部分に直交するように内側に向けられた部分とで平面視Ｔ字状に形成され、かつ山形突起部６７の前記案内面Ｃにおける前記頂部６３ａ近くのベルト幅方向での内側に位置する箇所に凹部６３ｂを設けた形状に形成されている。 As shown in FIGS. 4 to 6, the metal core protrusion 63 constitutes a belt main body 60 by a metal protrusion 61 a that is integrally formed with a part of the metal core 61 and protrudes toward the inner peripheral surface of the belt. The outer shape is formed substantially in a mountain shape by covering with a mountain-shaped protrusion 67 made of a rubber material.
That is, the core metal protrusion 63 is formed in a mountain shape in a sectional view both in the belt width direction shown in FIG. 4 and in the belt circumferential direction shown in FIG. As shown in FIG. 6, the surface facing the inner side of the core metal protrusion 63 in the belt width direction is formed by an inclined surface that serves as a guide surface C for the idler wheel 4 and the detachment prevention guide 7.
Further, the mountain-shaped cored bar projection 63 is formed in a T-shape in plan view with a top portion 63a of a portion along the belt circumferential direction and a portion directed inward so as to be orthogonal to the portion. The protrusion 67 is formed in a shape in which a recess 63 b is provided at a position located on the inner side in the belt width direction near the top 63 a on the guide surface C.

〔駆動スプロケット〕
前記駆動スプロケット３は、図２、及び図７乃至図１２に示すように構成されている。
すなわち、後車軸１２に連結した大径の円盤状部材３０と、その円盤状部材３０の外周縁よりも径方向の外方へ突出するように設けられた複数の駆動爪体３１とを備えて構成されている。 (Drive sprocket)
The drive sprocket 3 is configured as shown in FIGS. 2 and 7 to 12.
That is, a large-diameter disk-shaped member 30 connected to the rear axle 12 and a plurality of drive claws 31 provided so as to protrude outward in the radial direction from the outer peripheral edge of the disk-shaped member 30 are provided. It is configured.

前記円盤状部材３０は、駆動軸である後車軸１２に固定されたハブ板１３と、そのハブ板１３の外周側にボルト連結された円環状の外周部材１４（外周側部分に相当）とで構成してあり、外周部材１４は、周方向で３等分された部分円弧状の分割円弧状部材１４ａ，１４ｂ，１４ｃの組み合わせで構成されている。 The disk-shaped member 30 includes a hub plate 13 fixed to the rear axle 12 as a drive shaft, and an annular outer peripheral member 14 (corresponding to an outer peripheral side portion) bolted to the outer peripheral side of the hub plate 13. The outer peripheral member 14 is configured by a combination of partial arc-shaped divided arc-shaped members 14a, 14b, and 14c that are equally divided into three in the circumferential direction.

図７乃至図１０に示すように、前記外周部材１４は、半径方向内方側のハブ板１３に対する取付箇所１５の近くよりも、半径方向で外方側の外周端縁１６の近くが厚肉となっていて、この外周端縁１６の近くが環状のリブ部３２となっている。
そして、この外周部材１４の外周端縁１６の半径方向での外方側に突出させて、かつ前記リブ部３２よりも左右方向での外側へ突出させて前記駆動爪体３１を一体に形成してある。 As shown in FIGS. 7 to 10, the outer peripheral member 14 is thicker in the radial direction near the outer peripheral edge 16 than in the vicinity of the mounting portion 15 on the radially inner hub plate 13. In the vicinity of the outer peripheral edge 16, an annular rib portion 32 is formed.
The drive claw body 31 is integrally formed by projecting outward in the radial direction of the outer peripheral edge 16 of the outer peripheral member 14 and projecting outward in the left-right direction from the rib portion 32. It is.

前記リブ部３２の左右方向での厚みｄ１は、クローラベルト６の左右の芯金突起６３同士の間における対向間隔よりも幅狭に形成されていて、前記芯金突起６３や、前記駆動爪体３１との相関で次のように設定されている。
つまり、図１１（ａ）に示すように、駆動爪体３１の左右方向での端面３１ａが係合用凹部６２の端面６２ａに接当した後に、前記係合用凹部６２の前記端面６２ａが駆動爪体３１の押圧力を受けて、図１１（ｂ）に示すように、ある程度の圧縮量δだけ変形されると、前記リブ部３２の端縁３２ａが芯金突起６３の内端側の面６３ｃに接当する。
このように、駆動爪体３１の左右方向での端面３１ａが係合用凹部６２の端面６２ａに接当してある程度弾性変形した後に、前記円盤状部材３０の左右方向での端面に相当するリブ部３２の左右方向の端縁３２ａが芯金突起６３の内端側の面６３ｃに接当するように、前記リブ部３２の左右方向の端縁３２ａと駆動爪体３１との相対的な左右方向位置を設定してある。 The thickness d1 of the rib portion 32 in the left-right direction is formed to be narrower than the facing distance between the left and right core metal protrusions 63 of the crawler belt 6, and the core metal protrusion 63 and the drive claw body are formed. The correlation is set as follows.
That is, as shown in FIG. 11A, after the end surface 31a in the left-right direction of the drive claw body 31 contacts the end surface 62a of the engagement recess 62, the end surface 62a of the engagement recess 62 is driven by the drive claw body. When the pressing force of 31 is applied and the rib 32 is deformed by a certain amount of compression δ as shown in FIG. 11B, the edge 32 a of the rib portion 32 is formed on the inner end surface 63 c of the core metal protrusion 63. Get in touch.
Thus, after the end surface 31a in the left-right direction of the driving claw body 31 abuts on the end surface 62a of the engaging recess 62 and is elastically deformed to some extent, the rib portion corresponding to the end surface in the left-right direction of the disk-shaped member 30 is obtained. The left and right end edges 32 a of the ribs 32 are in contact with the inner end surface 63 c of the core metal protrusion 63. The position is set.

すなわち、図１１（ａ）に示すように、駆動爪体３１の左右方向での端面３１ａと係合用凹部６２の端面６２ａとが接当する面の一部を便宜上接当箇所Ｐ１とした場合に、図１１（ｂ）に示すところの、リブ部３２の端縁３２ａと芯金突起６３の内端側の面６３ｃとの接当箇所Ｐ２が接当するまでの間にタイムラグを生じるように、前記駆動爪体３１の左右方向での端面３１ａと前記リブ部３２の左右方向の端縁３２ａとの相対的な左右方向位置を設定してある。 That is, as shown in FIG. 11A, when a part of a surface where the end surface 31a in the left-right direction of the driving claw body 31 abuts the end surface 62a of the engaging recess 62 is a contact location P1 for convenience. As shown in FIG. 11B, a time lag is generated until the contact point P2 between the end edge 32a of the rib portion 32 and the inner end surface 63c of the cored bar projection 63 contacts. A relative left-right position between the end face 31 a in the left-right direction of the drive claw body 31 and the end edge 32 a in the left-right direction of the rib portion 32 is set.

つまり、この位置関係を図１２に基づいて説明すると、次の通りである。
前記駆動爪体３１の左右方向での中心位置がベルト幅方向で係合用凹部６２の中心線ＣＬ上に位置している場合に、前記駆動爪体３１の左右方向での端面３１ａと係合用凹部６２の端面６２ａとの接当箇所Ｐ１、及び前記リブ部３２の端縁３２ａと芯金突起６３の内端側の面６３ｃとの接当箇所Ｐ２とは、それぞれ非接当状態にある。
このとき、接当箇所Ｐ１のうち、前記中心線ＣＬから係合用凹部６２の端面６２ａの接当箇所Ｐ１までの距離ＬＰ１−１と、前記中心線ＣＬから駆動爪体３１の左右方向での端面３１ａの接当箇所Ｐ１までの距離ＬＰ１−２との間に第１間隙ＬＰ１が存在している。
また、接当箇所Ｐ２のうち、前記中心線ＣＬから芯金突起６３の内端側の面６３ｃの接当箇所Ｐ２までの距離ＬＰ２−１と、前記中心線ＣＬから前記リブ部３２の端縁３２ａの接当箇所Ｐ２までの距離ＬＰ２−２との間に第２間隙ＬＰ２が存在している。
そして、前記第１間隙ＬＰ１よりも第２間隙ＬＰ２を、前記係合用凹部６２の前記端面６２ａが駆動爪体３１の押圧力を受けて圧縮変形した際の圧縮量δに相当する量だけ大きく設定してあるので、前述のように係合用凹部６２の端面６２ａが駆動爪体３１の押圧力を受けて圧縮変形して、リブ部３２の端縁３２ａが芯金突起６３の内端側の面６３ｃに接当するに必要な移動量に達するまでの間にタイムラグを生じる。 That is, this positional relationship will be described with reference to FIG.
When the center position of the drive claw body 31 in the left-right direction is positioned on the center line CL of the engagement recess 62 in the belt width direction, the end face 31a in the left-right direction of the drive claw body 31 and the engagement recess The contact point P1 with the end surface 62a of 62 and the contact point P2 with the end edge 32a of the rib portion 32 and the surface 63c on the inner end side of the cored bar 63 are in a non-contact state.
At this time, of the contact location P1, the distance LP1-1 from the center line CL to the contact location P1 of the end surface 62a of the engagement recess 62, and the end surface in the left-right direction of the drive claw body 31 from the center line CL. The first gap LP1 exists between the distance LP1-2 to the contact point P1 of 31a.
Further, in the contact location P2, the distance LP2-1 from the center line CL to the contact location P2 of the inner end surface 63c of the cored bar 63, and the edge of the rib portion 32 from the center line CL. A second gap LP2 exists between the distance LP2-2 to the contact point P2 at 32a.
Then, the second gap LP2 is set larger than the first gap LP1 by an amount corresponding to the compression amount δ when the end face 62a of the engaging recess 62 is compressed and deformed by the pressing force of the driving claw body 31. Therefore, as described above, the end surface 62 a of the engaging recess 62 is compressed and deformed by the pressing force of the driving claw body 31, and the end edge 32 a of the rib portion 32 is the surface on the inner end side of the core metal protrusion 63. There is a time lag until the amount of movement necessary to contact 63c is reached.

〔駆動爪体〕
駆動爪体３１は、図７乃至図１２に示すように、円盤状部材３０の板面に対して直交する横方向（左右方向）へ張り出すことにより、係合用凹部６２のベルト幅方向の長さよりもやや短く、かつ左右の芯金突起６３の両方にわたる長さと同程度の左右方向長さに形成されている。
この駆動爪体３１の左右方向の端面３１ａは、図９及び図１１に示すように、この駆動爪体３１の外端縁が水平面上に位置する状態で、その左右方向の端面３１ａは水平面に対して垂直ではなく、所定の爪傾斜角度α（水平面に対する傾斜角度に相当）を有した傾斜面によって形成してある。
そして、前記爪傾斜角度αを有した傾斜面である端面３１ａは駆動爪体３１の左右両端側に形成してあって、駆動爪体３１は、その左右両側の端面３１ａによって半径方向外方側が幅狭となるテーパー面に形成されている。
この爪傾斜角度αは、前記係合用凹部６２におけるベルト幅方向での端面６２ａに形成されたベルト傾斜角度βと同じ角度に設定してある。 [Driving claw body]
As shown in FIGS. 7 to 12, the drive claw body 31 projects in the lateral direction (left-right direction) perpendicular to the plate surface of the disk-shaped member 30, thereby causing the engagement recess 62 to extend in the belt width direction. The length is slightly shorter than that, and has the same length in the left-right direction as the length over both the left and right core metal protrusions 63.
As shown in FIGS. 9 and 11, the end surface 31a in the left-right direction of the driving claw body 31 is in a state in which the outer end edge of the driving claw body 31 is positioned on the horizontal plane. On the other hand, it is formed of an inclined surface having a predetermined claw inclination angle α (corresponding to an inclination angle with respect to a horizontal plane), not perpendicular to the surface.
End surfaces 31a, which are inclined surfaces having the claw inclination angle α, are formed on both left and right sides of the drive claw body 31, and the drive claw body 31 is located on the outer side in the radial direction by the end surfaces 31a on both the left and right sides. It is formed on a tapered surface that becomes narrow.
The claw inclination angle α is set to the same angle as the belt inclination angle β formed on the end surface 62a in the belt width direction of the engaging recess 62.

駆動爪体３１の周方向での前後に位置する前向き面３１ｂ（機体前進方向でのクローラベルト６に駆動力を付与する側の面）、及び後向き面３１ｃ（機体後進方向でのクローラベルト６に駆動力を付与する側の面）は、概ね円盤状部材３０の回転軌跡に対する法線に沿う方向ではあるが、やや回転中心側寄りの部位（付け根側）における周方向幅ｄ２が、回転中心から遠ざかる外方側の部位（爪先端側）の周方向幅ｄ３よりも広く構成してあり、駆動爪体３１の半径方向外方側ほど少し幅狭な先細り形状のテーパー面となっている。 A front-facing surface 31b (a surface on the side where the driving force is applied to the crawler belt 6 in the forward direction of the machine body) and a rearward surface 31c (a crawler belt 6 in the backward direction of the machine body) that are positioned forward and backward in the circumferential direction of the drive claw body 31. The surface on the side on which the driving force is applied) is generally in the direction along the normal to the rotation trajectory of the disk-shaped member 30, but the circumferential width d2 at the portion (base side) slightly closer to the rotation center side is less than the rotation center. The taper surface has a tapered shape that is wider than the circumferential width d3 of the outer side (nail tip side) that moves away, and is slightly narrower toward the radially outer side of the drive claw body 31.

この駆動爪体３１は、クローラベルト６の係合用凹部６２に対して、側面視で図１４に示すように係合してクローラベルト６を駆動するように構成されている。
つまり、図１４に示す係合点ａ１〜ａ９が、この図中で反時計回りに回動する駆動スプロケット３の駆動爪体３１と係合用凹部６２との噛み合い箇所を示しており、係合点ａ１よりも駆動スプロケット３の回転方向上手側では、駆動スプロケット３の駆動爪体３１と係合用凹部６２とは、まだ噛み合っていない。係合点ａ９よりも駆動スプロケット３の回転方向下手側では、駆動スプロケット３の駆動爪体３１と係合用凹部６２との係合は外れている。
このように、図１４に示す係合点ａ１〜ａ９のうち、係合点ａ１が噛み合い開始点であり、係合点ａ９が噛み合い終了点である。この各係合点ａ１〜ａ９のうち、係合点ａ８で駆動爪体３１による係合用凹部６２への押圧作用が最大となるように構成されている。駆動爪体３１の配設ピッチと、係合用凹部６２の配設ピッチとの関係が定められている。 The driving claw body 31 is configured to engage with the engaging recess 62 of the crawler belt 6 as shown in FIG. 14 in a side view to drive the crawler belt 6.
That is, the engagement points a1 to a9 shown in FIG. 14 indicate the meshing positions of the drive claw body 31 of the drive sprocket 3 that rotates counterclockwise and the engagement recess 62 in the drawing, and from the engagement point a1. However, on the upper side in the rotational direction of the drive sprocket 3, the drive claw body 31 of the drive sprocket 3 and the engaging recess 62 are not yet engaged with each other. On the lower side in the rotational direction of the drive sprocket 3 with respect to the engagement point a9, the engagement between the drive claw body 31 and the engagement recess 62 of the drive sprocket 3 is disengaged.
Thus, among the engagement points a1 to a9 shown in FIG. 14, the engagement point a1 is the engagement start point, and the engagement point a9 is the engagement end point. Among the engagement points a1 to a9, the pressing action of the drive claw body 31 on the engagement recess 62 is maximized at the engagement point a8. The relationship between the arrangement pitch of the drive claws 31 and the arrangement pitch of the engagement recesses 62 is determined.

〔リブ部〕
駆動スプロケット３のリブ部３２についてさらに詳述する。
図７乃至図９に示すように、駆動スプロケット３の円盤状部材３０の外周部に設けられるリブ部３２は、駆動スプロケット３の周方向で所定間隔おきに配設されている各駆動爪体３１の間に位置する外周面が、リブ部３２の左右方向での中央側が円盤状部材３０の半径方向外方側に位置し、左右両側が半径方向内方側に位置する山形の傾斜面３４に形成されている。
この山形の傾斜面３４において、円盤状部材３０を構成する外周部材１４の外周端縁１６は山形の頂部に位置することになる。
この傾斜面３４では、駆動スプロケット３がクローラベルト６と係合して駆動されている状態で、クローラベルト６との間で圧縮される泥土の反力受けとしての機能を備えており、その傾斜面３４とクローラベルト６との間に存在する泥土が圧縮作用を受けた際に、その泥土を左右方向への外方側へ逃がすための分力を与えることができるように傾斜している。 [Rib part]
The rib portion 32 of the drive sprocket 3 will be further described in detail.
As shown in FIG. 7 to FIG. 9, the rib portions 32 provided on the outer peripheral portion of the disk-shaped member 30 of the drive sprocket 3 are each drive claw bodies 31 arranged at predetermined intervals in the circumferential direction of the drive sprocket 3. The outer peripheral surface located between the rib portions 32 is a mountain-shaped inclined surface 34 in which the center side in the left-right direction of the rib portion 32 is located on the radially outer side of the disk-shaped member 30 and both the left and right sides are located on the radially inner side. Is formed.
In this angled inclined surface 34, the outer peripheral edge 16 of the outer peripheral member 14 constituting the disk-shaped member 30 is located at the top of the angled shape.
The inclined surface 34 has a function as a reaction force receiver for mud compressed between the crawler belt 6 and the drive sprocket 3 being engaged with the crawler belt 6. When the mud existing between the surface 34 and the crawler belt 6 is subjected to a compression action, the mud is inclined so as to give a component force for escaping the mud outward in the left-right direction.

リブ部３２の外周面側に形成される傾斜面３４は、図１１及び図１２に示すように、そのリブ部３２の端縁３２ａが前記芯金突起６３の内端側の面に設けられている接当箇所Ｐ２よりも、円盤状部材３０の半径方向での外方側に形成してあって、リブ３２と芯金突起６３との接当による位置規制機能を確保できるように構成してある。 As shown in FIGS. 11 and 12, the inclined surface 34 formed on the outer peripheral surface side of the rib portion 32 has an end edge 32 a of the rib portion 32 provided on the inner end surface of the core metal protrusion 63. It is formed on the outer side in the radial direction of the disc-like member 30 with respect to the contact point P2 that is present, and is configured so as to ensure a position regulating function by contact between the rib 32 and the core metal protrusion 63. is there.

また、各駆動爪体３１同士の間に位置する前記傾斜面３４の一部には、その駆動爪体３１同士の間に位置する傾斜面３４毎に、左右交互に切り欠き部３５が形成されている。この切り欠き部３５によって、外周面である傾斜面３４のうちの、頂部の一側で前記切り欠き部３５が存在する側の泥土を、その切り欠き部３５を通して円盤状部材３０の左右方向の一側で半径方向内方側へ排出できるように構成されている。前記切り欠き部３５は、駆動スプロケット３の周方向での両側部に傾斜面３５Ａが形成された半径方向視で台形状に形成されている。 Further, notches 35 are alternately formed on the left and right sides of the inclined surfaces 34 located between the drive claws 31 in a part of the inclined surfaces 34 located between the drive claws 31. ing. By this cutout portion 35, mud soil on the side of the top portion of the inclined surface 34 that is the outer peripheral surface is passed through the cutout portion 35 in the left-right direction of the disk-like member 30. It is configured to be able to discharge radially inward on one side. The notches 35 are formed in a trapezoidal shape when viewed in the radial direction in which inclined surfaces 35A are formed on both sides of the drive sprocket 3 in the circumferential direction.

ここでいう切り欠き部３５とは、リブ部３２の外周面側に付着する泥土が、前記外周面よりも半径方向での内方側へ移行することを許容するためのものである。つまり、前述した傾斜面３４のような、駆動スプロケット３がクローラベルト６と係合して駆動されている状態で、クローラベルト６との間で圧縮される泥土の反力受けとしての機能を備えて、泥土をリブ部３２の左右方向へ移行させる分力を生じさせるというものではなく、リブ部３２とクローラベルト６との間に挟まれた泥土が圧縮されると、その圧縮による押し出し作用で泥土を排出するための空間を形成するように切り欠かれた部分をいう。 The notch portion 35 here is for allowing the mud adhering to the outer peripheral surface side of the rib portion 32 to move inward in the radial direction from the outer peripheral surface. That is, a function as a reaction force receiver for mud soil compressed between the crawler belt 6 and the drive sprocket 3 engaged with the crawler belt 6 as in the inclined surface 34 described above is provided. Thus, it does not generate a component force that causes the mud to move in the left-right direction of the rib portion 32, but when the mud sandwiched between the rib portion 32 and the crawler belt 6 is compressed, A part cut out to form a space for discharging mud.

このリブ部３２に形成される切り欠き部３５は、円盤状部材３０の周方向で前後の駆動爪体３１同士の間に位置するリブ部３２の全範囲に亘るものではなく、図７に示すように、円盤状部材３０の周方向で、その切り欠き部３５の前後に位置する駆動爪体３１との間に間隔Ｓを隔てて形成されている。
このように、駆動爪体３１に近い位置でリブ部３２に間隔Ｓを残すことにより、リブ部３２による駆動爪体３１の支持強度を向上するとともに、その間隔Ｓに相当する残されたリブ部３２の左右方向の端縁が芯金突起６３との接当によって、駆動スプロケット３とクローラベルト６の位置ずれを規制する作用を残すことができる。 The notch portion 35 formed in the rib portion 32 does not extend over the entire range of the rib portion 32 positioned between the front and rear drive claws 31 in the circumferential direction of the disk-like member 30, and is shown in FIG. As described above, the disk-shaped member 30 is formed with a gap S between the drive claw bodies 31 positioned in front of and behind the notch 35 in the circumferential direction.
In this way, by leaving the gap S in the rib portion 32 at a position close to the drive claw body 31, the support strength of the drive claw body 31 by the rib portion 32 is improved and the remaining rib portion corresponding to the gap S is provided. By the contact of the end edge 32 in the left-right direction with the cored bar protrusion 63, it is possible to leave the effect of regulating the positional deviation between the drive sprocket 3 and the crawler belt 6.

〔別実施形態の１〕
実施の形態では、リブ部３２の外周面側に傾斜面３４と切り欠き部３５との両方を備えた例を示したが、このような構造に限らず、例えば、図１５に示すように、傾斜面３４だけを備えた構造であってもよい。この図１５では傾斜面３４は、リブ部３２の左右方向での中央部が円盤状部材３０の半径方向外方側に位置し、左右両側が半径方向内方側に位置することにより、リブ部３２の幅方向での中央部が頂部となる山形の形状に形成されたものを示している。
尚、この傾斜面３４の山形形状は、必ずしもリブ部３２の左右方向での中央位置が頂部となる形状に限らず、多少左右方向の一方側へ変位した位置に頂部が存在する形状であってもよく、あるいは、左右で傾斜角度の異なる形状であってもよい。
また、山形の形状としては、頂部が尖鋭なものである必要はなく、図示しないが、頂部が平坦で台形状に近い形状となるものであったり、頂部が円弧状に形成されたものであってもよい。要は、リブ部３２の左右両側へ振り分けて泥土を排出できるように左右両側に傾斜した面を有した形状であればよく、これらの形状を総称して山形と称する。 [Other Embodiment 1]
In the embodiment, an example in which both the inclined surface 34 and the cutout portion 35 are provided on the outer peripheral surface side of the rib portion 32 is shown, but not limited to such a structure, for example, as shown in FIG. The structure provided only with the inclined surface 34 may be sufficient. In FIG. 15, the inclined surface 34 is formed such that the center portion in the left-right direction of the rib portion 32 is located on the radially outer side of the disk-shaped member 30, and both left and right sides are located on the radially inner side. The figure shows that the central part in the width direction of 32 is formed in a mountain shape with the top part.
The angled shape of the inclined surface 34 is not necessarily limited to the shape in which the center position in the left-right direction of the rib portion 32 is the top, but is a shape in which the top is present at a position slightly displaced to one side in the left-right direction. Alternatively, the shape may be a shape with different inclination angles on the left and right.
In addition, the mountain shape does not need to have a sharp top, and although not shown, the top is flat and has a trapezoidal shape, or the top is formed in an arc shape. May be. In short, any shape having a surface inclined on both the left and right sides so that mud can be discharged by being distributed to the left and right sides of the rib portion 32 is collectively referred to as a mountain shape.

〔別実施形態の２〕
傾斜面３４の形態としては、実施の形態で示したような山形の形状のものに限らず、例えば、図１６（ａ）に示すような、リブ部３２の左右方向での一方側が円盤状部材３０の半径方向外方側に位置し、他方側が半径方向内方側に位置する傾斜面３４に形成されたものであってもよい。
そして、このような傾斜面３４を、円盤状部材３０の全周に亘って、左右方向での一方側から他方側へ向かう同じ傾斜の傾斜面３４であってもよく、また、各駆動爪体３２同士の間に位置するリブ部３２毎に、傾斜方向を異ならせて、左右交互にリブ部３２の一方側が円盤状部材３０の半径方向外方側に位置し、他方側が半径方向内方側に位置する傾斜面３４に形成してもよい。 [Second embodiment]
The form of the inclined surface 34 is not limited to the mountain shape as shown in the embodiment. For example, one side of the rib portion 32 in the left-right direction as shown in FIG. 30 may be formed on the inclined surface 34 located on the radially outer side and the other side on the radially inner side.
And such an inclined surface 34 may be the inclined surface 34 of the same inclination which goes to the other side from the one side in the left-right direction over the perimeter of the disk-shaped member 30, and each drive nail | claw body The rib portions 32 positioned between the ribs 32 have different inclination directions, and one side of the rib portions 32 is alternately positioned on the radially outer side of the disk-shaped member 30 and the other side is radially inward. You may form in the inclined surface 34 located in this.

〔別実施形態の３〕
傾斜面３４の形態としては、平らな面で形成されたものに限らず、例えば、図１６（ｂ）に示すような、湾曲面で形成されたものであってもよい。その湾曲面は、リブ部３２の左右方向での全体にわたって設けられたものに限らず、一部に形成されたものであってもよく、また、湾曲の曲率が途中で変化しているものであったり、扁平な面との組み合わせで構成されたものであってもよい。 [3 of another embodiment]
The form of the inclined surface 34 is not limited to a flat surface, and may be a curved surface as shown in FIG. The curved surface is not limited to the entire surface of the rib portion 32 provided in the left-right direction, and may be formed in part, and the curvature of the curve is changed in the middle. Or a combination with a flat surface.

〔別実施形態の４〕
傾斜面３４としては、リブ部３２の左右方向での全体にわたって一定の傾斜角度で設けられたものに限らず、例えば、図１６（ｃ）に示すように、リブ部３２の左右方向での一部にのみ傾斜面３４を形成し、残りは傾斜しない平坦状のリブ部３２であってもよく、あるいは、左右方向の全体に傾斜面３４が存在しても、その傾斜角度が複数段に異なるように形成されたものであってもよい。 [4 of another embodiment]
The inclined surface 34 is not limited to the inclined surface 34 provided at a constant inclination angle over the entire left and right direction of the rib portion 32. For example, as shown in FIG. The inclined surface 34 may be formed only at the portion, and the rest may be a flat rib portion 32 that is not inclined, or even if the inclined surface 34 exists in the entire left and right direction, the inclination angle differs in a plurality of stages. It may be formed as described above.

〔別実施形態の５〕
傾斜面３４と切り欠き部３５とを備えるにあたり、実施形態で示したように山形の傾斜面３４の左右何れか一方側の面に交互に切り欠き部３５を形成したものに限らず、図１７（ａ）に示すように、傾斜面３４が、リブ部３２の左右方向での一方側が円盤状部材３０の半径方向外方側に位置し、他方側が半径方向内方側に位置するように形成された傾斜面３４（図１６（ａ）参照）で、その傾斜面３４の左右に交互に切り欠き部３５を設けたものであってもよい。
この実施形態では、切り欠き部３５は、傾斜面３４のうちで、円盤状部材３０の半径方向外方側の位置と、円盤状部材３０の半径方向内方側の位置とに、交互に形成されることになるが、円盤状部材３０の周方向の前後に位置する駆動爪体３１同士の間におけるリブ部３２を、周方向で各駆動爪体３１同士の間のリブ部３２を交互に傾斜方向の異なる傾斜面３４に形成して、左右交互の各切り欠き部３５が全て円盤状部材３０の半径方向内方側の位置に形成されるように構成してもよい。 [5 of another embodiment]
The provision of the inclined surface 34 and the cutout portion 35 is not limited to the configuration in which the cutout portions 35 are alternately formed on either the left or right surface of the mountain-shaped inclined surface 34 as shown in the embodiment. As shown to (a), the inclined surface 34 is formed so that the one side in the left-right direction of the rib part 32 is located in the radial direction outer side of the disk-shaped member 30, and the other side is located in the radial direction inner side. The inclined surface 34 (see FIG. 16A) may be provided with notches 35 alternately on the left and right sides of the inclined surface 34.
In this embodiment, the cutout portions 35 are alternately formed on the inclined surface 34 at positions on the radially outer side of the disk-shaped member 30 and positions on the radially inner side of the disk-shaped member 30. However, the rib portions 32 between the drive claw bodies 31 positioned in the circumferential direction of the disk-like member 30 are alternately arranged, and the rib portions 32 between the drive claw bodies 31 are alternately arranged in the circumferential direction. It may be formed on the inclined surfaces 34 having different inclination directions so that the left and right alternate cutout portions 35 are all formed at positions on the radially inner side of the disk-shaped member 30.

〔別実施形態の６〕
傾斜面３４と切り欠き部３５とを備えるにあたり、実施形態で示したように山形の傾斜面３４の左右何れか一方側の面に交互に切り欠き部３５を形成したもの（図１７（ａ）参照）に限らず、図１７（ｂ）に示すように構成してもよい。
つまり、リブ部３２の左右方向での一方側が円盤状部材３０の半径方向外方側に位置し、他方側が半径方向内方側に位置するように形成された傾斜面３４で、全ての切り欠き部３５が前記傾斜面３４の円盤状部材３０の半径方向外方側、もしくは半径方向内方側に位置するように形成してもよい。 [6 of another embodiment]
When the inclined surface 34 and the notch 35 are provided, as shown in the embodiment, the notch 35 is alternately formed on the left or right surface of the angled inclined surface 34 (FIG. 17A). (Refer to FIG. 17B).
That is, all the notches are formed on the inclined surface 34 formed such that one side of the rib portion 32 in the left-right direction is located on the radially outer side of the disk-shaped member 30 and the other side is located on the radially inner side. The portion 35 may be formed so as to be located on the radially outer side or the radially inner side of the disk-shaped member 30 of the inclined surface 34.

〔別実施形態の７〕
傾斜面３４と切り欠き部３５とを備えるにあたり、実施形態で示したように山形の傾斜面３４の左右何れか一方側の面に交互に切り欠き部３５を形成したものに限らず、図１７（ｃ）に示すように、山形の傾斜面３４の左右両側に設けたものであってもよい。
この場合、左右の切り欠き部３５を円盤状部材３０の周方向で少し位置ずれさせて設けることにより、リブ部３２の左右方向幅が極端に狭くなることを避けられる。 [7 of another embodiment]
The provision of the inclined surface 34 and the cutout portion 35 is not limited to the configuration in which the cutout portions 35 are alternately formed on either the left or right surface of the mountain-shaped inclined surface 34 as shown in the embodiment. As shown in (c), it may be provided on both the left and right sides of the angled inclined surface 34.
In this case, by providing the left and right cutout portions 35 with a slight displacement in the circumferential direction of the disk-shaped member 30, it is possible to avoid the lateral width of the rib portion 32 from becoming extremely narrow.

〔別実施形態の８〕
リブ部３２に、傾斜面３４、あるいは切り欠き部３５を設けるにあたり、図１８（ａ）及び（ｂ）に示すように構成してもよい。
この実施形態の構造では、リブ部３２の外周面側に、円盤状部材３０の周方向での一方側が円盤状部材３０の半径方向外方側に位置し、他方側が半径方向内方側に位置するように形成された傾斜面部分３４ａと、その傾斜面部分３４に引き続いて、円盤状部材３０の周方向での一方側が円盤状部材３０の半径方向内方側に位置し、他方側が半径方向外方側に位置するように形成された傾斜面部分３４ｂと、リブ部３２の左右方向での一方側が円盤状部材３０の半径方向外方側に位置し、左右方向での他方側が半径方向内方側に位置するように形成された傾斜面部分３４ｃとで、傾斜面３４でもあり、切り欠き部３５でもある凹入部分を設けても良い。 [8 of another embodiment]
When providing the inclined surface 34 or the notch 35 in the rib part 32, you may comprise as shown to Fig.18 (a) and (b).
In the structure of this embodiment, on the outer peripheral surface side of the rib portion 32, one side in the circumferential direction of the disk-shaped member 30 is positioned on the radially outer side of the disk-shaped member 30, and the other side is positioned on the radially inner side. An inclined surface portion 34a formed so as to be formed, and subsequently to the inclined surface portion 34, one side in the circumferential direction of the disk-shaped member 30 is located on the radially inner side of the disk-shaped member 30, and the other side is in the radial direction. An inclined surface portion 34b formed so as to be located on the outer side, and one side of the rib portion 32 in the left-right direction is located on the radially outer side of the disk-shaped member 30, and the other side in the left-right direction is radially inward. A recessed portion that is also the inclined surface 34 and the notch 35 may be provided with the inclined surface portion 34c formed to be located on the side.

つまり、この凹入部分において、リブ部３２の外周面に近い部位、つまり円盤状部材３０の半径方向外方側に近い部分では、各傾斜面部分３４ａ，３４ｂ，３４ｃのそれぞれにおいて、クローラベルト６との間で挟圧される泥土を斜面に沿って移動させる分力が生じる傾向があるので、所謂傾斜面３４としての機能が備えられていることになる。
そして、それらの各傾斜面部分３４ａ，３４ｂ，３４ｃのそれぞれにおいて、リブ部３２の外周面から離れた部位、つまり円盤状部材３０の半径方向内方側に近い部分では、クローラベルト６との間に存在する泥土に対して、各傾斜面部分３４ａ，３４ｂ，３４ｃによる泥土を斜面に沿って移動させる分力が生じる傾向は失われるが、リブ部３２の外周面とクローラベルト６との間に存在する泥土を押し出すよう案内するので、切り欠き部３５としての機能が存在することになる。 That is, in this recessed portion, in the portion close to the outer peripheral surface of the rib portion 32, that is, in the portion close to the radially outer side of the disk-shaped member 30, the crawler belt 6 Since there is a tendency to generate a component force that moves the mud sandwiched between and along the slope, a function as a so-called inclined surface 34 is provided.
In each of the inclined surface portions 34 a, 34 b, 34 c, the portion away from the outer peripheral surface of the rib portion 32, that is, the portion close to the radially inner side of the disk-shaped member 30, is between the crawler belt 6. The tendency to generate a component force that moves the mud by the inclined surface portions 34 a, 34 b, 34 c along the slope is lost, but the mud soil existing between the rib portion 32 and the crawler belt 6 is lost. Since it guides to push out the existing mud, the function as the notch 35 exists.

このように、傾斜面３４と切り欠き部３５とは、互いの機能が複合した状態で作用する構造のものであってもよい。
尚、上記のように、傾斜面３４でもあり、切り欠き部３５でもある凹入部分をリブ部３２の外周面に設けるにあたり、図１８（ａ）に示すように、その凹入部分の周方向長さを、周方向での前後に位置する駆動爪体３１，３１同士の間で、前後に位置する駆動爪体３１，３１との間に間隔Ｓを隔てて形成するものに限らず、この間隔Ｓを無くしてもよい。つまり、前記各傾斜面部分３４ａ，３４ｂ，３４ｃのうち、前後の各傾斜面部分３４ａ，３４ｂが駆動爪体３１，３１の付け根位置から形成される構造のものであってもよい。 As described above, the inclined surface 34 and the cutout portion 35 may have a structure that acts in a state where their functions are combined.
As described above, when the recessed portion that is also the inclined surface 34 and the notch 35 is provided on the outer peripheral surface of the rib portion 32, as shown in FIG. The length is not limited to the one formed between the drive claw bodies 31 and 31 positioned at the front and rear in the circumferential direction and the distance between the drive claw bodies 31 and 31 positioned at the front and rear. The interval S may be eliminated. That is, of the inclined surface portions 34a, 34b, 34c, the front and rear inclined surface portions 34a, 34b may be formed from the base positions of the drive claws 31, 31.

本発明のクローラ走行装置は、実施形態で示したトラクタの他、コンバインや建設機械などの各種の車両の推進装置として用いることができる The crawler traveling device of the present invention can be used as a propulsion device for various vehicles such as a combine and a construction machine in addition to the tractor shown in the embodiment.

２クローラ走行装置
３駆動スプロケット
６クローラベルト
３０円盤状部材
３１駆動爪体
３２リブ部
３４傾斜面
３５切り欠き部
６０ベルト本体
６１芯金
６２係合用凹部
６３芯金突起 2 Crawler traveling device 3 Drive sprocket 6 Crawler belt 30 Disc-shaped member 31 Drive claw body 32 Rib part 34 Inclined surface 35 Notch part 60 Belt body 61 Core metal 62 Engaging recess 63 Core metal protrusion

Claims

The cored bar is embedded in the belt body made of rubber material at a constant pitch in the belt circumferential direction, and a pair of left and right cored bar projections for rolling guides project from the intermediate part in the belt width direction of each cored bar to the belt inner peripheral surface side. A crawler belt provided, and a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction,
The crawler belt has an engagement recess that engages with the drive claw of the drive sprocket on the inner peripheral surface side, and the engagement recess is located between the core bars in the belt circumferential direction,
The drive sprocket has drive claws that engage with engagement recesses formed in the crawler belt at predetermined intervals in the circumferential direction on the outer peripheral side of a disk-like member fitted between the left and right cored bar projections. A crawler traveling device equipped with,
The disk-shaped member of the drive sprocket has a width in the left-right direction narrower than an interval between the inner ends of the left and right cored bar projections on the outer peripheral side that enters between the left and right cored bar projections, and is against the cored bar projections. A rib portion formed so as to come into contact with the inner end surface of the cored bar projection in accordance with a change in the relative position of the drive sprocket in the left-right direction over a predetermined amount;
The edge part in the left-right direction of the rib part and the inner end side surface of the cored bar protrusion are configured such that contact points contacting each other are point contacts in the radial direction of the disk-shaped member,
The crawler travel device characterized in that an inclined surface is formed on the outer peripheral surface side of the rib portion to guide the mud adhering to the outer peripheral surface side to the outer side in the left-right direction of the rib portion.

The cored bar is embedded in the belt body made of rubber material at a constant pitch in the belt circumferential direction, and a pair of left and right cored bar projections for rolling guides project from the intermediate part in the belt width direction of each cored bar to the belt inner peripheral surface side. A crawler belt provided, and a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction,
The crawler belt has an engagement recess that engages with the drive claw of the drive sprocket on the inner peripheral surface side, and the engagement recess is located between the core bars in the belt circumferential direction,
The drive sprocket has drive claws that engage with engagement recesses formed in the crawler belt at predetermined intervals in the circumferential direction on the outer peripheral side of a disk-like member fitted between the left and right cored bar projections. A crawler traveling device equipped with,
The disk-shaped member of the drive sprocket has a width in the left-right direction narrower than an interval between the inner ends of the left and right cored bar projections on the outer peripheral side that enters between the left and right cored bar projections, and is against the cored bar projections. A rib portion formed so as to come into contact with the inner end surface of the cored bar projection in accordance with a change in the relative position of the drive sprocket in the left-right direction over a predetermined amount;
On the outer peripheral surface side of the rib portion, an inclined surface is formed that guides mud adhering to the outer peripheral surface side to the outer side in the left-right direction of the rib portion and to the inner side in the radial direction of the disk-shaped member. And
The core metal protrusion is formed in a shape that gradually becomes narrower from the lower end side portion toward the upper end side portion in the belt circumferential direction,
In the inclined surface formed on the outer peripheral surface side of the rib portion, the portion located on the outermost side in the radial direction of the disk-shaped member is the left and right sides in a state where the drive claw body is engaged with the engaging recess. A crawler traveling device , wherein the crawler traveling device is located on an inner side in a radial direction of the disk-shaped member with respect to a raceway surface formed on a laterally outer side of the core metal protrusion .

The cored bar is embedded in the belt body made of rubber material at a constant pitch in the belt circumferential direction, and a pair of left and right cored bar projections for rolling guides project from the intermediate part in the belt width direction of each cored bar to the belt inner peripheral surface side. A crawler belt provided, and a drive sprocket that applies rotational power to the crawler belt in the belt circumferential direction,
The crawler belt has an engagement recess that engages with the drive claw of the drive sprocket on the inner peripheral surface side, and the engagement recess is located between the core bars in the belt circumferential direction,
The drive sprocket has drive claws that engage with engagement recesses formed in the crawler belt at predetermined intervals in the circumferential direction on the outer peripheral side of a disk-like member fitted between the left and right cored bar projections. A crawler traveling device equipped with,
The disk-shaped member of the drive sprocket has a width in the left-right direction narrower than an interval between the inner ends of the left and right cored bar projections on the outer peripheral side that enters between the left and right cored bar projections, and is against the cored bar projections. A rib portion formed so as to come into contact with the inner end surface of the cored bar projection in accordance with a change in the relative position of the drive sprocket in the left-right direction over a predetermined amount;
On the outer peripheral surface side of the rib portion, an inclined surface that guides the mud adhering to the outer peripheral surface side to the outer side in the left-right direction of the rib portion is formed,
The rib portion is configured such that the thickness in the thickness direction of the disc-shaped member is thicker than the inner portion on the inner side in the radial direction of the disc-shaped member,
As for the entrance side end of the engaging recess, the right end in the belt width direction protrudes to the right side of the right lower end of the right core metal projection, and the left end in the belt width direction is the lower left of the left core metal projection. Overhang to the left of the edge,
When the drive claw body is engaged with the engagement recess, the right end portion of the drive claw body protrudes from the disk-like member to a position overlapping the core metal protrusion, and the left and right sides of the drive claw body A crawler traveling device characterized in that a left end portion in a direction extends from the disk-like member to a position overlapping with the cored bar protrusion .

The engaging recess is located between the core metal protrusions in the left and right belt circumferential directions of the metal cores arranged side by side in the belt circumferential direction, and is adjacent to the right metal core protrusion in the belt width direction. The interval between the right end surface and the left end surface adjacent to the left core metal protrusion is formed to be longer than the interval between the end surfaces in the belt circumferential direction,
The drive claw projects in the left-right direction of the disc-shaped member, and a right end surface that projects from the disc-shaped member to the right side in the left-right direction of the disc-shaped member and a left end that projects from the disc-shaped member to the left side The crawler traveling device according to any one of claims 1 to 3, wherein an interval between the surfaces is longer than an interval between end surfaces in the circumferential direction of the disk-shaped member .

The inclined surface formed on the outer peripheral surface side of the rib portion is located on the radially outer side of the disk-shaped member so that the mud soil is discharged by distributing to the left and right sides of the rib portion. The crawler travel device according to any one of claims 1 to 4, wherein the left and right sides are formed in a mountain shape positioned on the radially inner side .