JP5659917B2 - Multi-plate friction engagement device - Google Patents

Multi-plate friction engagement device Download PDF

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JP5659917B2
JP5659917B2 JP2011076633A JP2011076633A JP5659917B2 JP 5659917 B2 JP5659917 B2 JP 5659917B2 JP 2011076633 A JP2011076633 A JP 2011076633A JP 2011076633 A JP2011076633 A JP 2011076633A JP 5659917 B2 JP5659917 B2 JP 5659917B2
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plate
engagement
friction
engagement device
disc spring
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JP2012211613A (en
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晃 日比野
晃 日比野
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Toyota Motor Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D7/00Slip couplings, e.g. slipping on overload, for absorbing shock
    • F16D7/02Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
    • F16D7/024Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces
    • F16D7/025Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces with flat clutching surfaces, e.g. discs
    • F16D7/027Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces with flat clutching surfaces, e.g. discs with multiple lamellae
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D43/00Automatic clutches
    • F16D43/02Automatic clutches actuated entirely mechanically
    • F16D43/20Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure
    • F16D43/21Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure with friction members
    • F16D43/213Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure with friction members with axially applied torque-limiting friction surfaces
    • F16D43/215Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure with friction members with axially applied torque-limiting friction surfaces with flat friction surfaces, e.g. discs
    • F16D43/216Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure with friction members with axially applied torque-limiting friction surfaces with flat friction surfaces, e.g. discs with multiple lamellae
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D43/00Automatic clutches
    • F16D43/02Automatic clutches actuated entirely mechanically
    • F16D43/20Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure
    • F16D43/21Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure with friction members
    • F16D43/213Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure with friction members with axially applied torque-limiting friction surfaces
    • F16D43/218Automatic clutches actuated entirely mechanically controlled by torque, e.g. overload-release clutches, slip-clutches with means by which torque varies the clutching pressure with friction members with axially applied torque-limiting friction surfaces with conical friction surfaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D7/00Slip couplings, e.g. slipping on overload, for absorbing shock
    • F16D7/02Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
    • F16D7/024Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces
    • F16D7/028Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces with conical friction surfaces

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)

Description

本発明は、多板摩擦係合装置に関する。   The present invention relates to a multi-plate friction engagement device.

回転軸まわりに回転可能であり軸線方向に並設された環状の複数の第1プレートと、これら第1プレートの間に対向して配設された第2プレートとを軸線方向に押圧して、第1プレートと第2プレートとを摩擦係合させる多板摩擦係合装置に関する技術として、例えば特許文献1が挙げられる。   A plurality of annular first plates that can rotate around the rotation axis and are arranged in parallel in the axial direction, and a second plate disposed opposite to the first plates in the axial direction, As a technique related to the multi-plate friction engagement device that frictionally engages the first plate and the second plate, for example, Patent Document 1 is cited.

特許文献1には、複数枚の外歯プレート(第1プレート)の厚さを内歯プレート(第2プレート)の厚さより大きくして、外歯プレートの熱容量を増大させ、放熱性を向上させる技術について開示されている。   In Patent Document 1, the thickness of the plurality of external tooth plates (first plate) is made larger than the thickness of the internal tooth plate (second plate) to increase the heat capacity of the external tooth plate and improve heat dissipation. The technology is disclosed.

特開2008−138821号公報JP 2008-138821 A

特許文献1に記載されるような従来の多板摩擦係合装置では、プレート同士の摩擦係合によって発生する熱を外部に逃がす放熱性を向上させるため、外歯プレートと内歯プレートとの接触面を軸線方向と直交したまま、外歯プレート全体の厚みが増大されている。また、外歯プレートを厚くした分、内歯プレートの厚みは縮小される。しかしながら、装置の耐久性を考慮すると内歯プレートを薄くすることには限界があるので、トルク容量を低下させずに放熱性を向上させるべく外歯プレートの厚みを増大させた場合、第1プレートと第2プレートとのなす軸線方向の全長が長くなる虞がある。第1プレートと第2プレートとのなす軸線方向の全長が長くなると、設置スペースなどで制約を受けやすくなる。   In the conventional multi-plate frictional engagement device as described in Patent Document 1, contact between the external tooth plate and the internal tooth plate is improved in order to improve heat dissipation to release heat generated by frictional engagement between the plates to the outside. The thickness of the entire external tooth plate is increased while the surface is orthogonal to the axial direction. Further, the thickness of the inner tooth plate is reduced by the thickness of the outer tooth plate. However, considering the durability of the device, there is a limit to reducing the thickness of the inner tooth plate. Therefore, if the thickness of the outer tooth plate is increased to improve heat dissipation without reducing the torque capacity, the first plate There is a possibility that the total length in the axial direction formed by the second plate becomes longer. If the total length in the axial direction formed by the first plate and the second plate is increased, the installation space is likely to be restricted.

本発明は、上記の事情に鑑みてなされたものであって、トルク容量を低下させることなく、全長が長くなることを抑制することができ、かつ、放熱性を向上させることができる多板摩擦係合装置を提供することを目的とする。   The present invention has been made in view of the above circumstances, and can reduce the increase in the total length without reducing the torque capacity, and can improve the heat dissipation. An object is to provide an engagement device.

本発明は、上記課題を解決するために、回転軸まわりに回転可能であり軸線方向に並設された環状の複数の第1プレートと、前記複数の第1プレートの間に対向して配設された第2プレートと、前記第1プレートにより前記第2プレートを押圧するための軸線方向の押圧力を付加する押圧部材と、を備え、前記押圧部材による押圧力によって前記第1プレートと前記第2プレートとがそれぞれの接触面を介して摩擦係合される多板摩擦係合装置において、前記接触面における前記押圧部材と接触する径方向位置での前記第1プレートの厚みが、径方向内側端面の位置での厚みより大きく、前記第2プレートの前記接触面の軸線方向断面は、該接触面が対向する前記第1プレートの前記接触面に沿った形状であり、前記第1プレートとは反対に径方向外側に向けて厚みが減少する形状であることを特徴とする。 In order to solve the above-mentioned problems, the present invention is arranged to face each other between a plurality of annular first plates that are rotatable around a rotation axis and are arranged in parallel in the axial direction, and the plurality of first plates. And a pressing member for applying an axial pressing force for pressing the second plate by the first plate, and the first plate and the first plate by the pressing force by the pressing member. In the multi-plate frictional engagement device in which two plates are frictionally engaged with each other through respective contact surfaces, the thickness of the first plate at the radial position in contact with the pressing member on the contact surface is radially inward. rather greater than the thickness at the position of the end face, axial section of the contact surface of the second plate has a shape in which the contact surface along the contact surface of the first plate facing, said first plate On the contrary Characterized in that it is a shape that decreases in thickness toward the outward.

また、上記の多板摩擦係合装置において、前記第1プレートは、前記第2プレートとの前記接触面の軸線方向断面がテーパ状であることが好ましい。   In the multi-plate friction engagement device, the first plate preferably has a tapered axial cross section of the contact surface with the second plate.

同様に、上記の多板摩擦係合装置において、前記第1プレートは、前記第2プレートとの前記接触面の軸線方向断面が段差状であることが好ましい。   Similarly, in the multi-plate friction engagement device described above, it is preferable that the first plate has a stepped shape in an axial cross section of the contact surface with the second plate.

また、上記の多板摩擦係合装置において、当該多板摩擦係合装置がトルクリミッタであり、前記押圧部材が環状の皿バネであり、前記皿バネの径方向移動を係止する係止手段を備えることが好ましい。   In the multi-plate friction engagement device, the multi-plate friction engagement device is a torque limiter, the pressing member is an annular disc spring, and a locking means for locking the radial movement of the disc spring. It is preferable to provide.

また、上記の多板摩擦係合装置において、前記係止手段は、前記第1プレートの外周側に配置され前記第1プレートが並設されたドラムの側壁に設けられる、前記皿バネの内周端面と接触する突起であることが好ましい。   Further, in the multi-plate friction engagement device, the locking means is disposed on the outer peripheral side of the first plate and is provided on a side wall of a drum on which the first plate is arranged side by side. The protrusion is preferably in contact with the end face.

同様に、上記の多板摩擦係合装置において、前記係止手段は、前記第1プレートの外周側に配置され前記第1プレートが並設されたドラムの側壁に設けられる、前記皿バネの内周端面と係合する溝であることが好ましい。   Similarly, in the multi-plate frictional engagement device, the locking means is disposed on the outer peripheral side of the first plate and is provided on the side wall of the drum on which the first plate is juxtaposed. The groove is preferably engaged with the peripheral end surface.

本発明に係る多板摩擦係合装置では、押圧部材と接触する径方向位置での第1プレートの厚みが、径方向内側端面の位置での厚みより大きいため、低面圧部(径方向内側端面の位置など第2プレートとの接触面の面圧が低くなる領域)に比べて高面圧部(押圧部材と接触する径方向位置の近傍で第2プレートとの接触面の面圧が高くなる領域)の熱容量を増大させ、高面圧部においてより多く発生した発熱量を第1プレートに十分に吸収させることが可能となり、放熱性を向上させることができる。また、第1プレートの径方向内側端面の位置での厚みが薄いため、上記のように高面圧部の厚みを増やしても、第1プレート及び第2プレートによる軸線方向の全長が長くなるのを抑制することができる。さらに、第1プレートの厚みが径方向位置によって変化しているため、従来のように第1プレートと第2プレートの接触面を軸線方向と直交させた場合と比べて、第1プレートと第2プレートとの接触面積は増大し、これにより、トルク容量の低下を回避することができる。この結果、本発明に係る多板摩擦係合装置は、トルク容量を低下させることなく、全長が長くなることを抑制することができ、かつ、放熱性を向上させることができるという効果を奏する。   In the multi-plate friction engagement device according to the present invention, since the thickness of the first plate at the radial position in contact with the pressing member is larger than the thickness at the position of the radially inner end face, Compared with the area where the surface pressure of the contact surface with the second plate is low, such as the position of the end surface, the surface pressure of the contact surface with the second plate is high in the vicinity of the radial position in contact with the pressing member. The heat capacity generated in the high surface pressure portion can be sufficiently absorbed by the first plate, and the heat dissipation can be improved. Moreover, since the thickness at the position of the radially inner end surface of the first plate is thin, even if the thickness of the high surface pressure portion is increased as described above, the total axial length of the first plate and the second plate is increased. Can be suppressed. Further, since the thickness of the first plate changes depending on the radial position, the first plate and the second plate are compared with the case where the contact surface between the first plate and the second plate is orthogonal to the axial direction as in the prior art. The contact area with the plate is increased, so that a reduction in torque capacity can be avoided. As a result, the multi-plate friction engagement device according to the present invention has an effect that it is possible to suppress an increase in the total length without reducing the torque capacity and to improve heat dissipation.

図1は、本発明の第1実施形態に係る多板摩擦係合装置の一例としてのトルクリミッタの概略構成を示す図である。FIG. 1 is a diagram showing a schematic configuration of a torque limiter as an example of a multi-plate friction engagement device according to a first embodiment of the present invention. 図2は、本発明の第2実施形態に係る多板摩擦係合装置の一例としてのトルクリミッタの概略構成を示す図である。FIG. 2 is a diagram showing a schematic configuration of a torque limiter as an example of the multi-plate friction engagement device according to the second embodiment of the present invention. 図3は、第1実施形態及び第2実施形態の変形例に係る多板摩擦係合装置の一例としてのトルクリミッタの概略構成を示す図である。FIG. 3 is a diagram illustrating a schematic configuration of a torque limiter as an example of a multi-plate friction engagement device according to a modification of the first embodiment and the second embodiment.

以下に、本発明に係る多板摩擦係合装置の実施形態を図面に基づいて説明する。なお、以下の図面において、同一または相当する部分には同一の参照番号を付し、その説明は繰り返さない。   Embodiments of a multi-plate friction engagement device according to the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

[第1実施形態]
まず、図1を参照して、本発明の第1実施形態について説明する。図1は、本発明の第1実施形態に係る多板摩擦係合装置の一例としてのトルクリミッタ1の概略構成を示す図である。図1に示すトルクリミッタ1は、例えばハイブリッド車両のトランアスクル内に内蔵される、湿式または乾式の摩擦材を使用するタイプのトルクリミッタである。
[First Embodiment]
First, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a schematic configuration of a torque limiter 1 as an example of a multi-plate friction engagement device according to a first embodiment of the present invention. A torque limiter 1 shown in FIG. 1 is a torque limiter of a type that uses a wet or dry friction material, which is built in, for example, a hybrid vehicle.

図1に示すように、トルクリミッタ1は、ドラム2とハブ3とを備える。ドラム2及びハブ3は、図1では図示しない下方にある同一の回転軸まわりに配置されている。また、ドラム2は、入力軸(図示せず)と一体回転可能に連結されて、ハブ3は、出力軸(図示せず)と一体回転可能に連結されている。つまり、入力軸、ドラム2、ハブ3、及び出力軸は、同一の回転軸上で回転することができるよう構成されている。   As shown in FIG. 1, the torque limiter 1 includes a drum 2 and a hub 3. The drum 2 and the hub 3 are arranged around the same rotational axis below (not shown in FIG. 1). The drum 2 is connected to an input shaft (not shown) so as to be integrally rotatable, and the hub 3 is connected to an output shaft (not shown) so as to be integrally rotatable. That is, the input shaft, the drum 2, the hub 3, and the output shaft are configured to be able to rotate on the same rotation shaft.

ドラム2は、回転軸まわりに配置される円盤部2aと、円盤部2aの外周側から立設させた筒部2bとを有する。入力軸は円盤部2aの内周側にスプライン嵌合や溶接により連結される。ハブ3は、筒状の部材であって、ドラム2の筒部2bより回転軸に近い位置に、その外周面3aがドラム2の筒部2bの内周面と対向するよう配置されている。   The drum 2 has a disk part 2a disposed around the rotation axis and a cylinder part 2b erected from the outer peripheral side of the disk part 2a. The input shaft is connected to the inner peripheral side of the disk portion 2a by spline fitting or welding. The hub 3 is a cylindrical member, and is disposed at a position closer to the rotation shaft than the cylindrical portion 2 b of the drum 2 so that the outer peripheral surface 3 a faces the inner peripheral surface of the cylindrical portion 2 b of the drum 2.

ドラム2には、その筒部2bの内周面2cよりも径方向の内側で且つハブ3の外周面3aに向けて延在する、複数の環状の係合プレート(第1プレート)4が、回転軸の軸線方向に並設されている。図1に示す例では、3つの係合プレート4a,4b,4cが(図1の左方から順に)配設されている。それぞれの係合プレート4a,4b,4cは、筒部2bの内周面2cに連結された環状のフランジの如きものであり、ドラム2と一体になって回転軸まわりに回転可能である。   The drum 2 has a plurality of annular engagement plates (first plates) 4 extending radially inward from the inner peripheral surface 2c of the cylindrical portion 2b and toward the outer peripheral surface 3a of the hub 3. They are juxtaposed in the axial direction of the rotary shaft. In the example shown in FIG. 1, three engagement plates 4a, 4b, 4c are arranged (in order from the left in FIG. 1). Each of the engagement plates 4a, 4b, 4c is like an annular flange connected to the inner peripheral surface 2c of the cylindrical portion 2b, and is rotatable integrally with the drum 2 around the rotation axis.

一方、ハブ3には、その外周面3aよりも径方向の外側で且つドラム2の筒部2bの内周面2cに向けて延在させた環状の摩擦体(第2プレート)5が、係合プレート4の間に係合プレート4と対向するよう配設される。図1に示す例では、3つの係合プレート4a,4b,4cに合わせて2つの摩擦体5a,5bが、回転軸の軸線方向に沿って(図1の左方から順に)並設され、摩擦体5aが係合プレート4a,4bの間に、また摩擦体5bが係合プレート4b,4cの間に配置されている。それぞれの摩擦体5a,5bは、ハブ3と一体になって回転軸まわりに回転可能である。   On the other hand, the hub 3 has an annular friction body (second plate) 5 extending radially outward from the outer peripheral surface 3a and extending toward the inner peripheral surface 2c of the cylindrical portion 2b of the drum 2. The mating plate 4 is disposed so as to face the engagement plate 4. In the example shown in FIG. 1, two friction bodies 5 a and 5 b are arranged in parallel along the axial direction of the rotating shaft (in order from the left in FIG. 1) in accordance with the three engagement plates 4 a, 4 b and 4 c, The friction body 5a is disposed between the engagement plates 4a and 4b, and the friction body 5b is disposed between the engagement plates 4b and 4c. Each of the friction bodies 5a and 5b is integrated with the hub 3 and can rotate around the rotation axis.

回転軸の軸線方向でドラム2側に位置する(つまり円盤部2a側に配設された)摩擦体5aは、ハブ3に連結された環状プレート6aと、この環状プレート6aの両面に固設された環状の摩擦材7a,8aとを有する。これと同様に、摩擦体5bについても、ハブ3に連結された環状プレート6bと、この環状プレート6bの両面に固設された環状の摩擦材7b,8bとを有する。摩擦体5aの両面の摩擦材7a,8aは、係合プレート4a,4bに挟まれており、摩擦体5bの両面の摩擦材7b,8bは、係合プレート4b,4cに挟まれている。   The friction body 5a located on the drum 2 side in the axial direction of the rotation shaft (that is, disposed on the disk portion 2a side) is fixed to the annular plate 6a connected to the hub 3 and both surfaces of the annular plate 6a. Ring-shaped friction materials 7a and 8a. Similarly, the friction body 5b also includes an annular plate 6b connected to the hub 3, and annular friction members 7b and 8b fixed to both surfaces of the annular plate 6b. The friction materials 7a and 8a on both surfaces of the friction body 5a are sandwiched between the engagement plates 4a and 4b, and the friction materials 7b and 8b on both surfaces of the friction body 5b are sandwiched between the engagement plates 4b and 4c.

なお、係合プレート4a,4b,4cと、摩擦体5a,5bの環状プレート6a,6bは、熱伝導性の高い鉄系材料等の金属により形成されることが好ましい。   The engagement plates 4a, 4b, 4c and the annular plates 6a, 6b of the friction bodies 5a, 5b are preferably made of a metal such as an iron-based material having high thermal conductivity.

また、このトルクリミッタ1は、係合プレート4aを摩擦材7aに押し付け、係合プレート4bを摩擦材8a,7bに押し付け、係合プレート4cを摩擦材8bに押し付けるべく、これらに対して回転軸の軸線方向へ押圧力を付加する環状の皿バネ(押圧部材)9と、その押圧力を受け止める環状のスナップリング10とを備える。   Further, the torque limiter 1 has a rotating shaft for pressing the engagement plate 4a against the friction material 7a, the engagement plate 4b against the friction materials 8a and 7b, and the engagement plate 4c against the friction material 8b. Are provided with an annular disc spring (pressing member) 9 for applying a pressing force in the axial direction, and an annular snap ring 10 for receiving the pressing force.

皿バネ9は、ドラム2の円盤部2aと、この円盤部2aに対向する係合プレート4aとの間に配置され、係合プレート4aに対して円盤部2a側から軸線方向の押圧力を付加するものである。組み付け後のトルクリミッタ1においては、停止中(静的状態)であると動作中(動的状態)であるとに拘わらず、皿バネ9の外周端面9bの一方の角部が係合プレート4aと当接し、皿バネ9の弾発力を係合プレート4aと円盤部2aとに作用させる。なお、軸線方向の押圧力を付加することができる押圧部材として、皿バネ9は安価のため好適であるが、押圧力を付加できさえすれば皿バネ9以外のものを用いてもよい。   The disc spring 9 is disposed between the disc portion 2a of the drum 2 and the engagement plate 4a facing the disc portion 2a, and applies a pressing force in the axial direction to the engagement plate 4a from the disc portion 2a side. To do. In the torque limiter 1 after assembly, one corner of the outer peripheral end surface 9b of the disc spring 9 is engaged with the engagement plate 4a regardless of whether it is stopped (static state) or in operation (dynamic state). And the elastic force of the disc spring 9 is applied to the engagement plate 4a and the disk portion 2a. The disc spring 9 is suitable as a pressing member that can apply a pressing force in the axial direction because it is inexpensive, but a member other than the disc spring 9 may be used as long as the pressing force can be applied.

一方、スナップリング10は、係合プレート4a,4b,4cからみて皿バネ9とは軸線方向の反対側(図1では係号プレートの右方)から、係合プレート4a,4b,4c及び摩擦体5a,5bを皿バネ9と挟み込むよう配置され、係合プレート4cが押圧力の方向へ移動するのを係止するものである。組み付け後のトルクリミッタ1においては、停止中(静的状態)であると動作中(動的状態)であるとに拘わらず、そのスナップリング10の一方の環状の平面を係合プレート4cの環状の平面に当接させる。   On the other hand, the snap ring 10 is engaged with the engagement plates 4a, 4b, 4c and friction from the opposite side of the disc spring 9 in the axial direction as viewed from the engagement plates 4a, 4b, 4c (to the right of the engagement plate in FIG. 1). It arrange | positions so that the body 5a, 5b may be inserted | pinched with the disc spring 9, and it latches that the engagement plate 4c moves to the direction of a pressing force. In the torque limiter 1 after assembly, regardless of whether the torque limiter 1 is stopped (static state) or in operation (dynamic state), one annular plane of the snap ring 10 is connected to the annular shape of the engagement plate 4c. It abuts on the flat surface.

このトルクリミッタ1には、過負荷の際に入力軸側と出力軸側との連結を切り離す限界トルク(トルク容量ともいう)が設定されている。この限界トルクは、摩擦材7a,8a,7b,8bの摩擦係数、摩擦材7a,8a,7b,8bと係合プレート4a,4b,4cとの接触面積、皿バネ9による摩擦材7a,8a,7b,8bと係合プレート4a,4b,4cとの間の押圧力等により決まる。   The torque limiter 1 is set with a limit torque (also referred to as torque capacity) that disconnects the connection between the input shaft side and the output shaft side in the event of an overload. This limit torque includes the friction coefficient of the friction materials 7a, 8a, 7b and 8b, the contact area between the friction materials 7a, 8a, 7b and 8b and the engagement plates 4a, 4b and 4c, and the friction materials 7a and 8a by the disc spring 9. , 7b, 8b and the pressing force between the engagement plates 4a, 4b, 4c.

例えば入力軸からトルクが入力されると、ドラム2が係合プレート4a,4b,4cと共に回転する。その際、入力トルクが限界トルク以下であれば、係合プレート4a,4b,4cと摩擦体5a,5bとがそれぞれとの接触面を介して皿バネ9による押圧力によって摩擦係合され、このように摩擦係合された摩擦体5a,5bと係合プレート4a,4b,4cとが一体となって回転する。従って、その際には、入力軸と出力軸とが連結され、一体になって回転する。一方、入力トルクが限界トルクを超えていれば、摩擦体5a,5bと係合プレート4a,4b,4cとが滑りながら回転するので、入力軸と出力軸とは、その連結が切り離されて滑りながら回転する。   For example, when torque is input from the input shaft, the drum 2 rotates together with the engagement plates 4a, 4b, and 4c. At this time, if the input torque is equal to or less than the limit torque, the engagement plates 4a, 4b, 4c and the friction bodies 5a, 5b are frictionally engaged by the pressing force of the disc spring 9 via the contact surfaces thereof. Thus, the friction bodies 5a, 5b and the engagement plates 4a, 4b, 4c frictionally engaged with each other rotate as a unit. Therefore, at that time, the input shaft and the output shaft are connected and rotate together. On the other hand, if the input torque exceeds the limit torque, the friction bodies 5a, 5b and the engagement plates 4a, 4b, 4c rotate while sliding, so that the input shaft and the output shaft are disconnected from each other and slipped. Rotate while.

そして、特に本実施形態のトルクリミッタ1では、図1に示すように、係合プレート4a,4b,4cと摩擦体5a,5bとの接触面において、皿バネ9と接触する径方向位置R1での係合プレート4a,4b,4cの厚みが、径方向内側端面の位置R2での厚みより大きくなるよう構成されている。より詳細には、係合プレート4a,4b,4cは、摩擦体5a,5bとの接触面の軸方向断面がテーパ状であるよう構成されている。   In particular, in the torque limiter 1 of the present embodiment, as shown in FIG. 1, at the contact surface between the engagement plates 4 a, 4 b, 4 c and the friction bodies 5 a, 5 b, at the radial position R 1 that contacts the disc spring 9. The engagement plates 4a, 4b, and 4c are configured to have a thickness greater than the thickness at the position R2 of the radially inner end face. More specifically, the engagement plates 4a, 4b, 4c are configured such that the axial cross section of the contact surface with the friction bodies 5a, 5b is tapered.

図1に示すように、係合プレート4a,4b,4cの軸方向断面をみると、係合プレート4a,4b,4cは、径方向内側の端面の位置R2において、軸線方向の厚みが最小となり、径方向外側にすすむにつれて連続的に厚みが増大し、皿バネ9と接触する径方向位置R1を経て、径方向外側の端面の位置R3において厚みが最大となる。図1に示す例では、左方から摩擦体5aのみと接触可能な係合プレート4aは、摩擦体5aと対向し接触する一面のみが、径方向外側に向けて厚みが増大するテーパ状とされ、同様に、右方から摩擦体5bのみと接触可能な係合プレート4cは、摩擦体5bと対向し接触する一面のみが、径方向外側に向けて厚みが増大するテーパ状とされる。摩擦体5a,5bの間に配置される係合プレート4bは、摩擦体5a,5bとそれぞれ対向し接触する両面が、径方向外側に向けて厚みが増大するテーパ状とされる。   As shown in FIG. 1, when the axial cross sections of the engagement plates 4a, 4b, and 4c are viewed, the engagement plates 4a, 4b, and 4c have the smallest axial thickness at the position R2 on the radially inner end face. The thickness increases continuously as it goes outward in the radial direction, and reaches the maximum at the position R3 on the radially outer end face through the radial position R1 in contact with the disc spring 9. In the example shown in FIG. 1, the engagement plate 4 a that can contact only the friction body 5 a from the left is tapered so that only one surface that faces and contacts the friction body 5 a increases in thickness radially outward. Similarly, the engagement plate 4c that can contact only the friction body 5b from the right side has a tapered shape in which only one surface that faces and contacts the friction body 5b increases in the radial direction. The engagement plate 4b disposed between the friction bodies 5a and 5b has a tapered shape in which both surfaces facing and contacting the friction bodies 5a and 5b increase in thickness toward the outside in the radial direction.

なお、図1に示すように、摩擦体5a,5bの摩擦材7a,8a,7b,8bも、係合プレート4a,4b,4cに対応して、係合プレート4a,4b,4cとの接触面の軸線方向断面が、係合プレート4a,4b,4cとは反対に径方向外側に向けて厚みが減少するテーパ状とされている。   As shown in FIG. 1, the friction members 7a, 8a, 7b, 8b of the friction bodies 5a, 5b are also in contact with the engagement plates 4a, 4b, 4c corresponding to the engagement plates 4a, 4b, 4c. The axial cross section of the surface is tapered so that the thickness decreases radially outward, opposite to the engagement plates 4a, 4b, 4c.

また、本実施形態のトルクリミッタ1は、皿バネ9の径方向移動を係止する係止手段を備える。具体的には、係合プレート4a,4b,4cの外周側に配置され係合プレート4a,4b,4cが並設されたドラム2の円盤部2a(側壁)に突起11が設けられ、この突起11が、皿バネ9の内周端面9aと径方向内側から接触して、皿バネ9の径方向移動を係止する係止手段として機能する。なお、突起11は、皿バネ9の径方向移動を係止することができればよく、回転軸からの径方向の所定位置における円弧軌道上に等間隔に複数個配設してもよいし、この軌道上に円環形状で設けてもよい。   Further, the torque limiter 1 of the present embodiment includes a locking unit that locks the radial movement of the disc spring 9. Specifically, the protrusion 11 is provided on the disk portion 2a (side wall) of the drum 2 that is arranged on the outer peripheral side of the engagement plates 4a, 4b, and 4c, and the engagement plates 4a, 4b, and 4c are arranged side by side. 11 functions as a locking means that contacts the inner peripheral end surface 9 a of the disc spring 9 from the radially inner side and locks the radial movement of the disc spring 9. The protrusions 11 need only be able to stop the radial movement of the disc spring 9, and a plurality of protrusions 11 may be arranged at equal intervals on a circular arc track at a predetermined radial position from the rotating shaft. An annular shape may be provided on the track.

なお、突起11の設置位置は、この突起11とドラム2の筒部2bの内周面2cとなす隙間に皿バネ9が配置されたときに、皿バネ9が潰された状態でこじらない程度にこの隙間が十分な広さをもつよう設定される。   In addition, the installation position of the projection 11 is such that the disc spring 9 is not crushed when the disc spring 9 is crushed when the disc spring 9 is disposed in the gap between the projection 11 and the inner peripheral surface 2c of the cylindrical portion 2b of the drum 2. The gap is set to have a sufficient width.

次に、本実施形態に係るトルクリミッタ1の作用効果について説明する。   Next, the function and effect of the torque limiter 1 according to this embodiment will be described.

一般に、トルクリミッタ1においては、係合プレート4a,4b,4cや摩擦体5a,5bは、皿バネ9により軸線方向の押圧力を付加されるため、この皿バネ9と係合プレート4aとが接触し押圧力を付加される径方向位置の近傍において局所的に面圧が高くなる(以下このように面圧が高くなる領域を「高面圧部」という)。一方、皿バネ9と係合プレート4aとの接触位置から離れた位置(例えば径方向の接触位置より軸心側)では、面圧が低くなる(以下このように面圧が低くなる領域を「低面圧部」という)。このように、係合プレート4a,4b,4cと摩擦体5a,5bとの接触面上での面圧分布は一定ではない。このため、トルクリミッタ1が作動する際には、係合プレート4a,4b,4cと摩擦体5a,5bの間で摺動抵抗による発熱が生じるが、その発熱量も、面圧と同様に一定とはならず、高面圧部において大きく、低面圧部において小さくなる。   In general, in the torque limiter 1, the engagement plates 4 a, 4 b, 4 c and the friction bodies 5 a, 5 b are applied with a pressing force in the axial direction by the disc spring 9. The surface pressure locally increases in the vicinity of the radial position where contact and pressure are applied (hereinafter, the region where the surface pressure increases is referred to as “high surface pressure portion”). On the other hand, at a position away from the contact position between the disc spring 9 and the engagement plate 4a (for example, on the axial center side from the radial contact position), the surface pressure becomes low (hereinafter, the region where the surface pressure becomes low is referred to as “ "Low contact pressure part"). Thus, the surface pressure distribution on the contact surface between the engagement plates 4a, 4b, 4c and the friction bodies 5a, 5b is not constant. For this reason, when the torque limiter 1 is operated, heat is generated by sliding resistance between the engagement plates 4a, 4b, 4c and the friction bodies 5a, 5b, but the amount of generated heat is also constant as with the surface pressure. However, it is large in the high surface pressure portion and small in the low surface pressure portion.

そこで、本実施形態のトルクリミッタ1では、係合プレート4a,4b,4cと摩擦体5a,5bとの接触面において、皿バネ9と接触する径方向位置R1での係合プレート4a,4b,4cの厚みが、径方向内側端面の径方向位置R2での厚みより大きくなるよう構成されている。すなわち、係合プレート4a,4b,4cの厚みを、低面圧部に比べて高面圧部でより厚くしている。このような構成により、低面圧部に比べて高面圧部の熱容量を増大させることができ、高面圧部においてより多く発生した発熱量を係合プレート4a,4b,4cに十分に吸収させることが可能となる。これにより、本実施形態のトルクリミッタ1は、放熱性を向上させることができる。   Therefore, in the torque limiter 1 of the present embodiment, the engagement plates 4a, 4b, and 4b at the radial position R1 that contacts the disc spring 9 on the contact surfaces of the engagement plates 4a, 4b, and 4c and the friction bodies 5a and 5b. The thickness of 4c is configured to be larger than the thickness at the radial position R2 of the radially inner end face. That is, the engagement plates 4a, 4b, and 4c are made thicker at the high surface pressure portion than at the low surface pressure portion. With such a configuration, the heat capacity of the high surface pressure portion can be increased as compared with the low surface pressure portion, and the generated heat generated more in the high surface pressure portion is sufficiently absorbed by the engagement plates 4a, 4b, 4c. It becomes possible to make it. Thereby, the torque limiter 1 of this embodiment can improve heat dissipation.

一方、高面圧部に比べて発熱量の低い低面圧部では、高面圧部ほどの熱容量は不要であるので、係合プレート4a,4b,4cの厚みを高面圧部に比べて薄くしている。また、このような係合プレート4a,4b,4cの形状に合わせて、摩擦体5a,5bの形状も、係合プレート4a,4b,4cとは反対に径方向外側に向けて厚みが減少するよう構成されている。このような構成により、係合プレート4a,4b,4cの高面圧部の厚みを増やしても、係合プレート4a,4b,4cと摩擦体5a,5bとが交互に摩擦係合される際の、係合プレート4a,4b,4c及び摩擦体5a,5bによる軸線方向の全長が長くなるのを抑制することができる。   On the other hand, in the low surface pressure portion where the calorific value is lower than that in the high surface pressure portion, the heat capacity as high as the high surface pressure portion is unnecessary. It is thin. Further, in accordance with the shape of the engagement plates 4a, 4b, 4c, the shape of the friction bodies 5a, 5b also decreases in thickness toward the radially outer side as opposed to the engagement plates 4a, 4b, 4c. It is configured as follows. With such a configuration, even when the thickness of the high surface pressure portion of the engagement plates 4a, 4b, 4c is increased, the engagement plates 4a, 4b, 4c and the friction bodies 5a, 5b are alternately frictionally engaged. It is possible to prevent the axial length of the engagement plates 4a, 4b, 4c and the friction bodies 5a, 5b from increasing.

さらに、係合プレート4a,4b,4c(および摩擦体5a,5b)の厚みが径方向位置によって変化しているため、従来のように係合プレートと摩擦体の接触面を軸線方向と直交させた場合と比べて、係合プレート4a,4b,4cや摩擦体5a,5bの径方向の長さが同一であっても、係合プレート4a,4b,4cと摩擦体5a,5bとの接触面積を増大させることができる。これにより、トルクリミッタ1の限界トルク(トルク容量)の低下を回避することができる。   Further, since the thickness of the engagement plates 4a, 4b, 4c (and the friction bodies 5a, 5b) varies depending on the radial position, the contact surface between the engagement plate and the friction body is made orthogonal to the axial direction as in the prior art. Compared with the case where the engagement plates 4a, 4b, 4c and the friction bodies 5a, 5b have the same radial length, the contact between the engagement plates 4a, 4b, 4c and the friction bodies 5a, 5b. The area can be increased. Thereby, the fall of the limit torque (torque capacity) of the torque limiter 1 can be avoided.

この結果、本実施形態のトルクリミッタ1は、トルク容量を低下させることなく、全長が長くなることを抑制することができ、かつ、放熱性を向上させることができる。   As a result, the torque limiter 1 of the present embodiment can suppress an increase in the overall length without reducing the torque capacity, and can improve heat dissipation.

また、本実施形態のトルクリミッタ1では、係合プレート4a,4b,4cは、摩擦体5a,5bとの接触面の軸方向断面がテーパ状であるよう構成されているので、係合プレート4a,4b,4cと摩擦体5a,5bとの接触面積を増やして、放熱性やトルク容量を向上させることができる。   Further, in the torque limiter 1 of the present embodiment, the engagement plates 4a, 4b, and 4c are configured such that the axial cross section of the contact surface with the friction bodies 5a and 5b is tapered. , 4b, 4c and the friction bodies 5a, 5b can be increased to improve heat dissipation and torque capacity.

また、従来のトルクリミッタでは、皿バネ9が径方向にずれて、係合プレート4aとの接触位置が変わる場合があった。これに対し、本実施形態のトルクリミッタ1では、係合プレート4a,4b,4cの外周側に配置され係合プレート4a,4b,4cが並設されたドラム2の円盤部2a(側壁)に突起11が設けられ、この突起11が、皿バネ9の内周端面9aと径方向内側から接触して、皿バネ9の径方向移動を係止する係止手段として機能する。この構成により、皿バネ9の径方向のズレが抑制されるので、係合プレート4aと皿バネ9との接触位置を径方向位置R1で一定に保持することができる。これにより、厚みが小さくなる径方向内側で皿バネ9が係合プレート4aと接触するのを回避して、係合プレート4a,4b,4cの厚みが大きい径方向位置にて常に皿バネ9を係合プレート4aと接触させ高面圧部とすることができる。   In the conventional torque limiter, the disc spring 9 may be displaced in the radial direction, and the contact position with the engagement plate 4a may change. On the other hand, in the torque limiter 1 of the present embodiment, the disk 2a (side wall) of the drum 2 is disposed on the outer peripheral side of the engagement plates 4a, 4b, 4c and the engagement plates 4a, 4b, 4c are arranged in parallel. A protrusion 11 is provided, and this protrusion 11 is in contact with the inner peripheral end surface 9 a of the disc spring 9 from the inside in the radial direction, and functions as a locking means that locks the radial movement of the disc spring 9. With this configuration, since the radial displacement of the disc spring 9 is suppressed, the contact position between the engagement plate 4a and the disc spring 9 can be held constant at the radial position R1. Thus, the disc spring 9 is prevented from coming into contact with the engagement plate 4a on the radially inner side where the thickness is reduced, and the disc spring 9 is always kept at the radial position where the thickness of the engagement plates 4a, 4b, 4c is large. It can be made to contact with the engagement plate 4a to form a high surface pressure portion.

[第2実施形態]
次に、図2を参照して、本発明の第2実施形態について説明する。図2は、本発明の第2実施形態に係る多板摩擦係合装置の一例としてのトルクリミッタ1aの概略構成を示す図である。本実施形態のトルクリミッタ1aは、図2に示すように、係合プレート12a,12b,12cの摩擦体13a,13bとの接触面の軸方向断面を段差状とされている点において、軸方向断面がテーパ状であった上記第1実施形態のトルクリミッタ1と異なるものである。
[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram showing a schematic configuration of a torque limiter 1a as an example of the multi-plate friction engagement device according to the second embodiment of the present invention. As shown in FIG. 2, the torque limiter 1a of the present embodiment has an axial direction in that the axial cross section of the contact surface of the engagement plates 12a, 12b, 12c with the friction bodies 13a, 13b is stepped. This is different from the torque limiter 1 of the first embodiment in which the cross section is tapered.

このトルクリミッタ1aでは、係合プレート12a,12b,12cは、径方向内側領域L1と径方向外側領域L2の2つの領域に区分され、径方向外側領域L2において係合プレート12aが皿バネ9と接触するよう、突起11により皿バネ9の径方向位置が固定されている。また、係合プレート12a,12b,12cの軸線方向の厚みは、径方向内側領域L1に比べて径方向外側領域L2を厚くするよう構成されている。そして、このような径方向内側領域L1と径方向外側領域L2の厚みの較差を実現するために、図2に示すように、左方から摩擦体13aのみと接触可能な係合プレート12aでは、摩擦体13aと対向する一面のみが、径方向内側領域L1と径方向外側領域L2との境界において、径方向外側領域L2側の厚みがステップ状に増大する段差状とされ、同様に、右方から摩擦体13bのみと接触可能な係合プレート12cでは、摩擦体13bと対向する一面のみが、径方向内側領域L1と径方向外側領域L2との境界において、径方向外側領域L2側の厚みがステップ状に増大する段差状とされる。摩擦体13a,13bの間に配置される係合プレート12bは、摩擦体13a,13bと対向する両面が、それぞれ径方向内側領域L1と径方向外側領域L2との境界において径方向外側領域L2側の厚みがステップ状に増大する段差状とされる。   In the torque limiter 1a, the engagement plates 12a, 12b, and 12c are divided into two regions, ie, a radially inner region L1 and a radially outer region L2, and the engagement plate 12a and the disc spring 9 are separated in the radially outer region L2. The radial position of the disc spring 9 is fixed by the protrusion 11 so as to come into contact. Moreover, the axial thickness of the engagement plates 12a, 12b, and 12c is configured such that the radially outer region L2 is thicker than the radially inner region L1. And in order to implement | achieve the difference of the thickness of such radial direction inner area | region L1 and radial direction outer area | region L2, as shown in FIG. 2, in the engagement plate 12a which can contact only the friction body 13a from the left, Only one surface facing the friction body 13a has a stepped shape in which the thickness on the radial outer region L2 side increases stepwise at the boundary between the radial inner region L1 and the radial outer region L2, and similarly to the right side. In the engagement plate 12c that can come into contact only with the friction body 13b, only one surface facing the friction body 13b has a thickness on the radial outer region L2 side at the boundary between the radial inner region L1 and the radial outer region L2. The step shape increases stepwise. The engaging plate 12b disposed between the friction bodies 13a and 13b has both surfaces facing the friction bodies 13a and 13b on the radial outer region L2 side at the boundary between the radial inner region L1 and the radial outer region L2, respectively. The thickness of the step is increased stepwise.

なお、図2に示すように、摩擦体13a,13bの摩擦材14a,15a,14b,15bも、係合プレート12a,12b,12cと対応して、係合プレート12a,12b,12cとの接触面の軸線方向断面が、係合プレート12a,12b,12cとは反対に径方向内側領域L1と径方向外側領域L2との境界において径方向外側領域L2側の厚みがステップ状に減少する段差状とされている。   As shown in FIG. 2, the friction members 14a, 15a, 14b, 15b of the friction bodies 13a, 13b are also in contact with the engagement plates 12a, 12b, 12c corresponding to the engagement plates 12a, 12b, 12c. The cross section in the axial direction of the surface is a stepped shape in which the thickness on the radial outer region L2 side decreases stepwise at the boundary between the radial inner region L1 and the radial outer region L2 opposite to the engagement plates 12a, 12b, 12c. It is said that.

次に、第2実施形態に係るトルクリミッタ1aの作用効果について説明する。   Next, the effect of the torque limiter 1a according to the second embodiment will be described.

このようなトルクリミッタ1aにおいては、係合プレート12a,12b,12cが、摩擦体13a,13bとの接触面において、皿バネ9と接触する径方向外側領域L2の高面圧部の厚みを、径方向内側領域L1の底面圧部に比べて厚くされている。このため、係合プレート12a,12b,12cも、図1に示す係合プレート4a,4b,4cと同様に、低面圧部に比べて高面圧部の熱容量を増大させることができ、高面圧部においてより多く発生した発熱量を係合プレート12a,12b,12cに十分に吸収させることが可能となる。   In such a torque limiter 1a, the engagement plates 12a, 12b, and 12c have the thickness of the high surface pressure portion of the radially outer region L2 in contact with the disc spring 9 on the contact surface with the friction bodies 13a and 13b. It is thicker than the bottom pressure portion of the radially inner region L1. For this reason, the engagement plates 12a, 12b, and 12c can increase the heat capacity of the high surface pressure portion as compared with the low surface pressure portion, similarly to the engagement plates 4a, 4b, and 4c shown in FIG. It becomes possible for the engagement plates 12a, 12b, and 12c to sufficiently absorb the heat generated more in the surface pressure portion.

また、係合プレート12a,12b,12cは、径方向内側領域L1の底面圧部の厚みを高面圧部に比べて薄くされているため、図1に示す係合プレート4a,4b,4cと同様に、係合プレート12a,12b,12c及び摩擦体13a,13bによる軸線方向の全長が長くなるのを抑制することができる。   Further, since the engagement plates 12a, 12b, and 12c have the bottom surface pressure portion of the radially inner region L1 thinner than the high surface pressure portion, the engagement plates 4a, 4b, and 4c shown in FIG. Similarly, it can suppress that the full length of the axial direction by engagement plate 12a, 12b, 12c and friction body 13a, 13b becomes long.

また、係合プレート12a,12b,12cの厚みが、径方向内側領域L1と径方向外側領域L2との境界において変化しているため、図1に示す係合プレート4a,4b,4cと同様に、係合プレート12a,12b,12cと摩擦体13a,13bとの接触面積を増大させることができ、トルクリミッタ1aのトルク容量の低下を回避することができる。   Further, since the thicknesses of the engagement plates 12a, 12b, and 12c change at the boundary between the radial inner region L1 and the radial outer region L2, similarly to the engagement plates 4a, 4b, and 4c shown in FIG. The contact area between the engagement plates 12a, 12b, and 12c and the friction bodies 13a and 13b can be increased, and a decrease in the torque capacity of the torque limiter 1a can be avoided.

このように、第2実施形態に係るトルクリミッタ1aも、上記第1実施形態のトルクリミッタ1と同様に、トルク容量を低下させることなく、全長が長くなることを抑制することができ、かつ、放熱性を向上させることができる。   Thus, the torque limiter 1a according to the second embodiment can suppress the increase in the total length without reducing the torque capacity, similarly to the torque limiter 1 of the first embodiment, and The heat dissipation can be improved.

また、このトルクリミッタ1aでは、係合プレート12a,12b,12cは、摩擦体13a,13bとの接触面の軸方向断面が段差状であるよう構成されているので、図1に示す係合プレート4a,4b,4cと同様に、係合プレート12a,12b,12cと摩擦体13a,13bとの接触面積を増やして、放熱性やトルク容量を向上させることができる。   Further, in the torque limiter 1a, the engagement plates 12a, 12b, and 12c are configured such that the axial cross section of the contact surface with the friction bodies 13a and 13b is stepped, so that the engagement plate shown in FIG. Similarly to 4a, 4b, and 4c, the contact area between the engagement plates 12a, 12b, and 12c and the friction bodies 13a and 13b can be increased to improve heat dissipation and torque capacity.

[変形例]
次に、図3を参照して、上記第1実施形態及び第2実施形態の変形例について説明する。図3は、第1実施形態及び第2実施形態の変形例に係る多板摩擦係合装置の一例としてのトルクリミッタ1bの概略構成を示す図である。なお、図3に示すトルクリミッタ1bは、第1実施形態のトルクリミッタ1をベースとして構成を例示しているが、第2実施形態のトルクリミッタ1aをベースとして構成してもよい。
[Modification]
Next, a modification of the first embodiment and the second embodiment will be described with reference to FIG. FIG. 3 is a diagram illustrating a schematic configuration of a torque limiter 1b as an example of a multi-plate friction engagement device according to a modification of the first embodiment and the second embodiment. In addition, although the torque limiter 1b shown in FIG. 3 has illustrated the structure based on the torque limiter 1 of 1st Embodiment, you may comprise based on the torque limiter 1a of 2nd Embodiment.

上記第1、第2実施形態では、皿バネ9の径方向移動を係止する係止手段としてドラム2の円盤部2aに突起11を設けたが、この代わりに、図3に示すように、係合プレート4a,4b,4cの外周側に配置され係合プレート4a,4b,4cが並設されたドラム2の円盤部2a(側壁)に溝16を設けてもよい。この溝16は、皿バネ9の内周端面9aの円環形状と対応するようドラム2の円盤部2a上に円環状に形成され、皿バネ9の内周端面9aの一方の角部と係合して、皿バネ9の径方向移動を係止する係止手段として機能する。   In the first and second embodiments, the projection 11 is provided on the disk portion 2a of the drum 2 as a locking means for locking the radial movement of the disc spring 9, but instead, as shown in FIG. A groove 16 may be provided in the disk portion 2a (side wall) of the drum 2 arranged on the outer peripheral side of the engagement plates 4a, 4b, 4c and provided with the engagement plates 4a, 4b, 4c. The groove 16 is formed in an annular shape on the disk portion 2a of the drum 2 so as to correspond to the annular shape of the inner peripheral end surface 9a of the disc spring 9, and is engaged with one corner of the inner peripheral end surface 9a of the disc spring 9. In combination, it functions as a locking means for locking the radial movement of the disc spring 9.

また、この溝16の他に、さらに皿バネ9の外周端面9bの一方の角部を係合させるための溝17を、係合プレート4aのドラム2の円盤部2aと対向する面に設けてもよい。   In addition to the groove 16, a groove 17 for engaging one corner of the outer peripheral end surface 9b of the disc spring 9 is provided on the surface of the engagement plate 4a facing the disk portion 2a of the drum 2. Also good.

なお、溝16,17の設置位置は、皿バネ9が配置されたときに、皿バネ9が潰された状態でこじらない程度に、溝16,17の径方向位置の間隔が設定される。   In addition, as for the installation positions of the grooves 16 and 17, the distance between the radial positions of the grooves 16 and 17 is set so that when the disk spring 9 is disposed, the grooves 16 and 17 are not twisted when the disk spring 9 is crushed.

このトルクリミッタ1bでは、溝16,17が、上記実施形態の突起11と同様に、皿バネ9の径方向移動を係止する係止手段として機能することができるので、係合プレート4aと皿バネ9との接触位置を一定に保持することが可能となり、係合プレート4a,4b,4cの厚みが大きい径方向位置にて常に皿バネ9を係合プレート4aと接触させ高面圧部とすることができる。   In the torque limiter 1b, the grooves 16 and 17 can function as locking means for locking the radial movement of the disc spring 9, similarly to the projection 11 of the above embodiment. The contact position with the spring 9 can be kept constant, and the disc spring 9 is always brought into contact with the engagement plate 4a at the radial position where the thickness of the engagement plates 4a, 4b, 4c is large. can do.

以上、本発明について好適な実施形態を示して説明したが、本発明はこれらの実施形態により限定されるものではない。例えば、上記実施形態では、多板摩擦係合装置の一例としてトルクリミッタ1,1a,1bを挙げて説明したが、本発明は、トルクリミッタ1,1a,1bに限らず、摩擦クラッチなど他のタイプの多板摩擦係合装置にも同様に適用することができる。本発明を摩擦クラッチに適用する場合、上記実施形態では係合プレート4,12に軸方向の押圧力を付加する押圧手段として皿バネ9を適用したが、この代わりにピストンなどを適用することができる。ピストンは、係合プレート4,12への押圧力の付加の有無を適宜切り替えることができ、ピストンが係合プレート4,12へ押圧力を付加したときに係合プレート4,12は摩擦体5,13と摩擦係合され、ピストンが押圧力の付加を止めたときに係合が解除される。   As mentioned above, although preferred embodiment was shown and demonstrated about this invention, this invention is not limited by these embodiment. For example, in the above-described embodiment, the torque limiters 1, 1a, 1b have been described as an example of the multi-plate friction engagement device. However, the present invention is not limited to the torque limiters 1, 1a, 1b, but may be other types such as a friction clutch. The same applies to the type of multi-plate friction engagement device. When the present invention is applied to a friction clutch, the disc spring 9 is applied as a pressing means for applying an axial pressing force to the engagement plates 4 and 12 in the above embodiment, but a piston or the like may be applied instead. it can. The piston can appropriately switch whether or not the pressing force is applied to the engagement plates 4 and 12, and when the piston applies the pressing force to the engagement plates 4 and 12, the engagement plates 4 and 12 are connected to the friction body 5. , 13 and the engagement is released when the piston stops applying the pressing force.

また、上記実施形態では、摩擦体5a,5b,13a,13bが、係合プレート4,12と接触する2面に摩擦材7a,8a,7b,8b,14a,15a,14b,15bを備えて構成されていたが、係合プレート4,12と摩擦体5,13との接触面に摩擦材が配置されていればよく、係合プレート4,12の表面に摩擦材を備える構成としてもよいし、係合プレート4,12と摩擦体5,13のそれぞれ一面ずつに摩擦材を備える構成としてもよい。   In the above embodiment, the friction bodies 5a, 5b, 13a, 13b are provided with the friction materials 7a, 8a, 7b, 8b, 14a, 15a, 14b, 15b on the two surfaces that come into contact with the engagement plates 4, 12. However, the friction material may be disposed on the contact surface between the engagement plates 4 and 12 and the friction bodies 5 and 13, and the friction material may be provided on the surfaces of the engagement plates 4 and 12. And it is good also as a structure provided with a friction material on each one surface of the engagement plates 4 and 12 and the friction bodies 5 and 13, respectively.

1,1a,1b…トルクリミッタ(多板摩擦係合装置)
2…ドラム
2a…ドラムの円盤部(ドラムの側壁)
4(4a,4b,4c),12(12a,12b,12c)…係合プレート(第1プレート)
5(5a,5b),13(13a,13b)…摩擦体(第2プレート)
9…皿バネ(押圧部材)
9a…皿バネの内周端面
11…突起(係止手段)
16…溝(係止手段)
R1…皿バネと接触する径方向位置
R2…径方向内側端面の位置

1, 1a, 1b ... Torque limiter (multi-plate friction engagement device)
2 ... Drum 2a ... Drum disk (drum side wall)
4 (4a, 4b, 4c), 12 (12a, 12b, 12c) ... engagement plate (first plate)
5 (5a, 5b), 13 (13a, 13b) ... friction body (second plate)
9 ... Belleville spring (pressing member)
9a ... inner peripheral end surface of disc spring 11 ... projection (locking means)
16 ... Groove (locking means)
R1: Radial position in contact with the disc spring R2: Position of the radially inner end face

Claims (6)

回転軸まわりに回転可能であり軸線方向に並設された環状の複数の第1プレートと、前記複数の第1プレートの間に対向して配設された第2プレートと、前記第1プレートにより前記第2プレートを押圧するための軸線方向の押圧力を付加する押圧部材と、を備え、前記押圧部材による押圧力によって前記第1プレートと前記第2プレートとがそれぞれの接触面を介して摩擦係合される多板摩擦係合装置において、
前記接触面における前記押圧部材と接触する径方向位置での前記第1プレートの厚みが、径方向内側端面の位置での厚みより大きく、
前記第2プレートの前記接触面の軸線方向断面は、該接触面が対向する前記第1プレートの前記接触面に沿った形状であり、前記第1プレートとは反対に径方向外側に向けて厚みが減少する形状である
ことを特徴とする多板摩擦係合装置。
A plurality of annular first plates that are rotatable around a rotation axis and arranged in parallel in the axial direction; a second plate disposed oppositely between the plurality of first plates; and the first plate. A pressing member for applying an axial pressing force for pressing the second plate, and the first plate and the second plate are rubbed through the respective contact surfaces by the pressing force of the pressing member. In the engaged multi-plate friction engagement device,
Wherein the first plate thickness in the radial direction position in contact with the pressing member at the contact surface is rather greater than the thickness at the position of the radially inner end surfaces,
The axial cross section of the contact surface of the second plate has a shape along the contact surface of the first plate that the contact surface is opposed to, and has a thickness toward the radially outer side opposite to the first plate. The multi-plate friction engagement device is characterized in that the shape decreases .
前記第1プレートは、前記第2プレートとの前記接触面の軸線方向断面がテーパ状であることを特徴とする、請求項1に記載の多板摩擦係合装置。   2. The multi-plate friction engagement device according to claim 1, wherein the first plate has a taper-shaped cross section in the axial direction of the contact surface with the second plate. 前記第1プレートは、前記第2プレートとの前記接触面の軸線方向断面が段差状であることを特徴とする、請求項1または2に記載の多板摩擦係合装置。   3. The multi-plate friction engagement device according to claim 1, wherein the first plate has a step shape in an axial cross section of the contact surface with the second plate. 4. 当該多板摩擦係合装置がトルクリミッタであり、
前記押圧部材が環状の皿バネであり、
前記皿バネの径方向移動を係止する係止手段を備えることを特徴とする、請求項1〜3のいずれか1項に記載の多板摩擦係合装置。
The multi-plate friction engagement device is a torque limiter,
The pressing member is an annular disc spring;
The multi-plate friction engagement device according to any one of claims 1 to 3, further comprising locking means for locking the disc spring in a radial direction.
前記係止手段は、前記第1プレートの外周側に配置され前記第1プレートが並設されたドラムの側壁に設けられる、前記皿バネの内周端面と接触する突起であることを特徴とする、請求項4に記載の多板摩擦係合装置。   The locking means is a protrusion that is disposed on the outer peripheral side of the first plate and is provided on a side wall of a drum on which the first plate is arranged in parallel with the inner peripheral end surface of the disc spring. The multi-plate friction engagement device according to claim 4. 前記係止手段は、前記第1プレートの外周側に配置され前記第1プレートが並設されたドラムの側壁に設けられる、前記皿バネの内周端面と係合する溝であることを特徴とする、請求項4に記載の多板摩擦係合装置。   The locking means is a groove that is disposed on an outer peripheral side of the first plate and that is provided on a side wall of a drum on which the first plate is arranged side by side and that engages with an inner peripheral end surface of the disc spring. The multi-plate friction engagement device according to claim 4.
JP2011076633A 2011-03-30 2011-03-30 Multi-plate friction engagement device Expired - Fee Related JP5659917B2 (en)

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