CN101806245A - Power transmission mechanism - Google Patents
Power transmission mechanism Download PDFInfo
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- CN101806245A CN101806245A CN201010120073A CN201010120073A CN101806245A CN 101806245 A CN101806245 A CN 101806245A CN 201010120073 A CN201010120073 A CN 201010120073A CN 201010120073 A CN201010120073 A CN 201010120073A CN 101806245 A CN101806245 A CN 101806245A
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- gear
- gear shaft
- idling
- input gear
- shaft
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Abstract
The invention provides a kind of power transmission mechanism, this power transmission mechanism is formed on the plane vertical with the axle center of idling gear shaft, with respect to first line parallel that is connected second contact points that idler gear and input first contact points of gear engagement and idler gear and output gear mesh and pass second line in the axle center of idling gear shaft, the length of the notch of the sense of rotation side of the input gear on first contact points is less than the length of the notch of the opposition side of this sense of rotation.
Description
The cross reference of related application
The present invention is based on the Japanese patent application of submitting on February 16th, 2009 (the special 2009-032817 of hope), this with reference to and quoted its content.
Technical field
The present invention relates to supporting structure by the gear shaft in the power transmission mechanism of idler gear transferring power between two gears.
Background technique
The present known motor that has trunnion shaft in order to reduce vibration that has.This motor has the trunnion shaft that rotates synchronously with bent axle, thereby offsets the vibration of following reciprocating motion of the pistons.Especially torque variation motor greatly as diesel engine is correctly synchronous in order to make bent axle and trunnion shaft, uses gear transmission power sometimes between these axles.In this case, be provided with idler gear (patent documentation 1) sometimes being arranged on the crankshaft gear on the bent axle and being arranged between the balance gear on the trunnion shaft.
In the motor shown in patent documentation 1 with idler gear, its structure is generally: the two ends that are used to support the pony axle of idler gear are fixed on cylinder body (cylinder block) and gear-box, on idling gear shaft and idler gear, bearing etc. is set, makes idler gear rotatable.And, form following structure in order to improve assembling performance, that is, an end (outboard end) of idling gear shaft is by being bolted on the gear-box, and the other end (inner end) inserts the bearing hole that is arranged at cylinder body.And, in order to prevent the sintering of idler gear, thrust plate (thrust brake) is set between idler gear and cylinder body.The D cutting part of the other end of this thrust plate by being arranged on idling gear shaft carries out spline.And the other end that is provided with the idling gear shaft of D cutting part inserts bearing hole.
But said structure is owing to the direction that acts on the power of idling gear shaft changes, and the inwall of the bight of D cutting part and the bearing hole of cylinder body collides repeatedly, and the inwall of bearing hole weares and teares gradually, finally might produce convex shoulder (step).
Patent documentation 1: Japanese patent application publication No. 2007-239521 number
Summary of the invention
An advantage aspect of the present invention provides the power transmission mechanism that suppresses the wearing and tearing of D cutting part and bearing hole in the spline structure of the gear shaft with D cutting part.
The present invention relates to a kind of power transmission mechanism, have:
The input gear shaft is used for supporting the input gear;
Output gear shaft is used to support the output gear that is arranged with above-mentioned input gear branch; And
Idling gear shaft, the axle center is set to depart from the line in the axle center of axle center that is connected above-mentioned input gear shaft and above-mentioned output gear shaft, the rotatable shape pivot of above-mentioned idling gear shaft props up idler gear, the engagement of above-mentioned idler gear and above-mentioned input gear and output gear and from above-mentioned input gear to above-mentioned output gear transferring power, and be formed with the D cut portion that section is the D font that is cut in an end of above-mentioned idling gear shaft
This D cut portion inserts in the bearing hole that is arranged on the supporting part, and this bearing hole is not supported revolvably relatively,
Above-mentioned D cutting part is characterised in that, with respect to first line parallel of second contact points of first contact points that is connected above-mentioned idler gear and above-mentioned input gear engagement and above-mentioned idler gear and the engagement of above-mentioned output gear and pass second line in the axle center of above-mentioned idling gear shaft, the length of the above-mentioned notch of the front side of the sense of rotation side of the above-mentioned input gear on above-mentioned first contact points is less than the length of the above-mentioned notch of the opposition side of this sense of rotation.
Poewr transmission mechanism of the present invention also can be set at above-mentioned D cut section in the circumferential locations of above-mentioned idling gear shaft: on the plane vertical with the axle center of above-mentioned idling gear shaft; In the excircle except the above-mentioned idling gear shaft of above-mentioned D cut section, make the part of front side of the above-mentioned direction of rotation of the above-mentioned input gear on above-mentioned first meshing point of relatively above-mentioned second line be projected in the distance of first on above-mentioned second line and be projected in second distance on above-mentioned second line greater than the part of the opposition side of the above-mentioned direction of rotation of the above-mentioned input gear on above-mentioned first meshing point of relatively above-mentioned second line.
Power transmission mechanism of the present invention carries out positive and negative variation to above-mentioned idler gear torque transmitted with respect to above-mentioned sense of rotation from above-mentioned input gear, and above-mentioned D cut portion is set in the circumferential locations of above-mentioned idling gear shaft: the ratio that makes above-mentioned first distance and above-mentioned second distance with from above-mentioned input gear to above-mentioned idler gear torque transmitted the maximum value of the above-mentioned sense of rotation side of above-mentioned input gear and peaked in the opposite direction side of the above-mentioned sense of rotation of above-mentioned input gear than consistent.
The bent axle that the above-mentioned input gear shaft of power transmission mechanism of the present invention is a motor, above-mentioned output gear shaft is the trunnion shaft of above-mentioned motor.。
The part that the above-mentioned notch of power transmission mechanism of the present invention can be cut into the outer peripheral surface of above-mentioned idling gear shaft is plane.
The above-mentioned axle center of the above-mentioned idling gear shaft of power transmission mechanism of the present invention is arranged on the position after the direction displacement vertical with this first line of above-mentioned first alignment.
The whole above-mentioned notch of power transmission mechanism of the present invention is arranged on the opposition side of the above-mentioned sense of rotation of the above-mentioned input gear on above-mentioned first contact points of above-mentioned relatively second line.
According to power transmission mechanism of the present invention, in input gear rotation during, on first contact points and the equidirectional power of the sense of rotation input gear are arranged in effect on the idling gear shaft then to the idler gear transferring power.The notch that the notch that the position of the sense of rotation front side on this first contact points forms forms less than the position at above-mentioned sense of rotation rear side, thus the minimizing of bearing hole lifting surface area prevented, can suppress surface pressure to bearing hole.The inner wall abrasion that therefore, can suppress the bearing hole of idling gear shaft and supporting part.
According to power transmission mechanism of the present invention, set the circumferential locations of notch for first distance greater than second distance, thus can be really during to the idler gear transferring power from the input gear and the force direction that is subjected to of idling gear shaft suppress surface pressure accordingly to bearing hole.
Power transmission mechanism according to third aspect present invention, because the torque of input gear changes, positive and negative upset, even act on the direction upset of the power of idling gear shaft, also can set so that the surface pressure unanimity during positive and negative each maximum value, maximally utilise the whole circumference of idling gear shaft, will be suppressed to inferior limit the surface pressure of bearing hole.
According to power transmission mechanism of the present invention, can suppress the surface pressure of the supporting part of the idling gear shaft on the power transfering part of trunnion shaft, suppress the wearing and tearing of supporting part, improve durability.
Description of drawings
Fig. 1 is the stereogram of structure that the trunnion shaft drive portion of the motor that present embodiment relates to is shown;
Fig. 2 is the front view that the structure of above-mentioned trunnion shaft drive portion is shown;
Fig. 3 is the sectional drawing that the structure of above-mentioned trunnion shaft drive portion is shown;
Fig. 4 is the explanatory drawing that the circumferential locations of the D cutting part on the idling gear shaft of above-mentioned trunnion shaft drive portion is shown; And
Fig. 5 relates to the chart that the torque of the crankshaft gear of above-mentioned trunnion shaft drive portion changes.
Embodiment
Below based on accompanying drawing embodiments of the present invention are described.
As shown in Figure 1 to Figure 3, be provided with the trunnion shaft 2 that be arranged in parallel with bent axle 4 in the bottom of the crankcase (crankcase) 3 of the motor 1 of present embodiment.
Trunnion shaft 2 is formed the deviation of gravity center axle center.Because connecting rod tilts, and vibrates along with the reciprocating motion of the pistons of motor 1.In order to offset this vibration, synchronously rotate driven equilibrium axle 2 with bent axle 4.
Bent axle 4 and trunnion shaft 2 rotatably are supported on the crankcase 3, and an end separately is outstanding to foreign side from the sidewall 3a of crankcase 3.
Undertaken by gear to the transmission of power of trunnion shaft 2 from bent axle 4.Crankshaft gear 5 is fixed on an end of bent axle 4.Balance gear 6 is fixed on an end of trunnion shaft 2.And, between crankshaft gear 5 and balance gear 6, idler gear 7 is set.The outside of the sidewall 3a of crankshaft gear 5, balance gear 6 and idler gear 7 close crankcases 3 and setting are at grade.Crankshaft gear 5 is arranged to and idler gear 7 engagements, and balance gear 6 is arranged to and idler gear 7 engagements.
The gear cap 8 of blocking balance gear 6 and idler gear 7 is connected by the bottom of bolt 9 with crankcase 3.An end of balance support axle 2 rotatably when on the gear cap 8 bearing hole 10 being set so that being fixed on the crankcase 3.
Idler gear 7 quilts rotatably pivot prop up (pivot, pivotal support) on idling gear shaft 21.Idling gear shaft 21 be arranged in parallel with bent axle 4 and trunnion shaft 2.One end of idling gear shaft 21 is connected with gear cap 8 by bolt 22.The other end of idling gear shaft 21 seamlessly inserts in the bearing hole 23 on the sidewall 3a (supporting part) that is arranged on crankcase 3, and the mode that can not rotate with relative bearing hole 23 supports.
The discoid thrust plate 24 that the axle direction bear idler gear 7 moves is set between the sidewall 3a of idler gear 7 and crankcase 3a.And, in the end of insertion bearing hole 23 sides of idling gear shaft 21 D cutting part 25 (notch) is set, and D cutting part (with reference to Fig. 4) also is set accordingly on the bearing hole of thrust plate 24 with this D cutting part 25.At this, the part that also D cutting part 25 can be cut into the circumferential surface that makes idling gear shaft 21 is plane.Therefore, idling gear shaft 21 does not engage revolvably with thrust plate 24, carries out the spline of thrust plate 24.
As shown in Figure 4, at the axle center C1 that idling gear shaft 21 is set to the right side from the line L1 deflection figure of the axle center C3 of the axle center C2 that connects bent axle 4 and trunnion shaft 2.In this embodiment, crankshaft gear 5 is in the drawings to right rotation (clockwise).Like this under the situation of She Zhiing, the power that acts on the idling gear shaft 21 and extending direction effect of line L3 of passing the axle center C1 of idling gear shaft 21 vertical to the line L2 (first line) of the second contact points P2 that meshes with the first contact points P1 that is connected crankshaft gear 5 and idler gear 7 engagements and balance gear 6 and idler gear 7.Carry out at crankshaft gear 5 on the motor 1 of present embodiment of right rotation, the power that acts on idling gear shaft 21 along the left of line L3 in figure to strong effect (A among the figure).That is, with respect to parallel with line L2 and pass the line L4 (second line) of the axle center C1 of idling gear shaft 21, compare with right side among the figure, the outer circle wall of the idling gear shaft 21 in left side is subjected to the bigger reaction force from the inwall of bearing hole 23 among the figure.The axle center C1 of idling gear shaft 21 can be arranged on from the position of the first line L2 to the direction displacement vertical with the first line L2.
In Fig. 5, upside is the direct rotational direction (right rotation direction) of crankshaft gear 5 among the figure, downside is the negative rotation veer (anticlockwise direction) of crankshaft gear 5 among the figure, the maximum value (maximum value of direct rotational direction) and the minimum value (maximum value of negative rotation veer) of the torque in each rotational speed of expression motor.
As shown in Figure 5, on the crankshaft gear 5 of motor 1,, on the negative rotation veer, also produce the torque that is less than direct rotational direction not only in direct rotational direction.Therefore, by such torque upset, act on the idling gear shaft 21 power not only in Fig. 4 left also act on to (A direction) effect to right (B direction).In the motor 1 of present embodiment, the maximum value of the torque of crankshaft gear 5 (maximum value of direct rotational direction) is a, and minimum value (maximum value of negative rotation veer) is b.
And, as shown in Figure 4,, set the circumferential locations that is formed on the D cutting part 25 on the idling gear shaft 21 based on the maximum value a and the minimum value b of prior measurement.
Concrete shown in following formula (1), set the circumferential locations of D cutting part 25 as described below, promptly, in the excircle of the idling gear shaft 21 of removing D cutting part 25 (Fig. 4 bend portion), make with respect to line L4 the distance L a on the online L4 of part projection in left side (first distance) with the ratio of the maximum value a of the ratio of the distance L b (second distance) on the online L4 of part projection on right side and the torque of crankshaft gear 5 and minimum value b is consistent.
La∶Lb＝a∶b (1)
As mentioned above, set the circumferential locations of D cutting part 25, thus the surface pressure of idling gear shaft 21 under the situation of maximum value a with the situation of minimum value b (reciprocal maximum value) under identical.Therefore, the power relevant with the positive and negative upset of idling gear shaft 21 is evenly dispersed on the peripheral wall, can suppresses surface pressure.By like this, the inwall of the bight of may command D cutting part 25 and bearing hole 23 contact pressure, suppress the wearing and tearing of inwall.
And, need not can realize the power transfering part miniaturization for surface pressure being controlled at the diameter of increase idling gear shaft 21 in the allowed band.
In addition, the circumferential locations that present embodiment has been set D cutting part 25 based on the maximum value a and the minimum value b of the torque of crankshaft gear 5, but the present invention is not limited to this.
For example, also D cutting part 25 can be arranged on the right side of the line L4 among Fig. 4 in the above-described embodiment.And, also whole above-mentioned D cutting part 25 can be arranged on the opposition side of the sense of rotation of the crankshaft gear 5 on the relative second line L4, the first contact points P1.Like this, the torque of crankshaft gear 5 is under the situation of maximum value a during positive rotation, and idling gear shaft 21 can be used with the whole left circles side face of bearing hole 23 contacting sides stressed, therefore, and the surface pressure in the time of can reducing positive rotation to greatest extent.And, if make the circumferential locations of distance L a at least greater than the shape set D cutting part 25 of distance L b, in the time of then can reducing positive rotation to the surface pressure of bearing hole 23.Promptly, can be on the plane vertical with the axle center C1 of idling gear shaft 21, parallel and pass the second line L4 of the axle center C1 of idling gear shaft 21 with respect to the first line L2 of the second contact points P2 that meshes with the first contact points P1 that connects idler gear 7 and crankshaft gear 5 engagements and idler gear 7 and balance gear 6, the length of D cutting part of sense of rotation side that makes the crankshaft gear 5 on the first contact points P1 is less than the length of the D cutting part of the opposition side of this sense of rotation.
And, in the above embodiment, the supporting portion that the balance gear 6 and the idler gear 7 between the crankshaft gear 5 of motor 1 is arranged on the idling gear shaft 21 that is used to support, but the present invention is not limited to this, also can be widely used in timing gear system as motor etc., have other the power transmission mechanism as the D cutting part of the spline device of gear shaft.
Though with reference to specific mode of execution just the present invention have been described in detail, in the scope that does not exceed aim of the present invention, scope or purpose, can carry out various changes or correction, this point is concerning being conspicuous with the dealer.
Claims (7)
1. power transmission mechanism has:
The input gear shaft is used for supporting the input gear;
Output gear shaft is used to support the output gear that is arranged with described input gear branch; And
Idling gear shaft, the axle center is set to depart from the line in the axle center of axle center that is connected described input gear shaft and described output gear shaft, described idling gear shaft rotatably pivot props up idler gear, the engagement of described idler gear and described input gear and output gear and from described input gear to described output gear transferring power, and be formed with in an end of described idling gear shaft and be cut into the notch that section is the D font
This notch inserts in the bearing hole that is arranged on the supporting part, and this bearing hole is not supported revolvably relatively,
It is characterized in that, with respect to first line parallel of second contact points of first contact points that is connected described idler gear and described input gear engagement and described idler gear and the engagement of described output gear and pass second line in the axle center of described idling gear shaft, the length of the described notch of the sense of rotation side of the described input gear on described first contact points is less than the length of the described notch of the opposition side of this sense of rotation.
2. power transmission mechanism according to claim 1 is characterized in that,
Described notch is set in the circumferential locations of described idling gear shaft: on the plane vertical with the axle center of described idling gear shaft, in the excircle except the described idling gear shaft of described notch, described relatively second line projection of part of described sense of rotation side that makes the described input gear on described first contact points is at part relatively described second line projection the second distance on described second line of the distance of first on described second line greater than the opposition side of the described sense of rotation of the described input gear on described first contact points.
3. power transmission mechanism according to claim 2 is characterized in that,
Carry out positive and negative variation to described idler gear torque transmitted with respect to described sense of rotation from described input gear,
Described notch is set in the circumferential locations of described idling gear shaft: the ratio that makes described first distance and described second distance with from described input gear to described idler gear torque transmitted the maximum value of the described sense of rotation of described input gear and reciprocal peaked in the described sense of rotation of described input gear than consistent.
4. power transmission mechanism according to claim 1 is characterized in that,
The part that described notch is cut into the outer peripheral surface that makes described idling gear shaft is plane.
5. power transmission mechanism according to claim 1 is characterized in that,
The described axle center of described idling gear shaft is arranged on the position after the direction displacement vertical with this first line of described first alignment.
6. power transmission mechanism according to claim 1 is characterized in that,
Described relatively second line of whole described notch is arranged on the opposition side of the described sense of rotation of the described input gear on described first contact points.
7. according to each described power transmission mechanism in the claim 1 to 6, it is characterized in that,
Described input gear shaft is the bent axle of motor, and described output gear shaft is the trunnion shaft of described motor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-032817 | 2009-02-16 | ||
| JP2009032817A JP4984093B2 (en) | 2009-02-16 | 2009-02-16 | Power transmission mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101806245A true CN101806245A (en) | 2010-08-18 |
| CN101806245B CN101806245B (en) | 2012-06-27 |
Family
ID=42608174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101200736A Expired - Fee Related CN101806245B (en) | 2009-02-16 | 2010-02-12 | Power transferring mechanism |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4984093B2 (en) |
| CN (1) | CN101806245B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909701A (en) * | 2011-08-06 | 2013-02-06 | 苏州宝时得电动工具有限公司 | Power tool |
| CN103119252A (en) * | 2010-10-22 | 2013-05-22 | 川崎重工业株式会社 | Power generation system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9732837B2 (en) | 2015-02-09 | 2017-08-15 | Hyundai Motor Company | Idle gear assembly |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2029515C3 (en) * | 1970-06-13 | 1975-04-24 | Fiat S.P.A., Turin (Italien) | Drive block for motor vehicles |
| JPS59110946A (en) * | 1982-12-14 | 1984-06-27 | Ricoh Co Ltd | Gear unit |
| JPS63123862U (en) * | 1987-02-03 | 1988-08-11 | ||
| JPH0976371A (en) * | 1995-09-12 | 1997-03-25 | Mitsubishi Electric Corp | Porous plastic bearing and its manufacture |
| JPH09242851A (en) * | 1996-03-07 | 1997-09-16 | Tec Corp | Power transmitting device |
| JP3961060B2 (en) * | 1997-03-19 | 2007-08-15 | 愛知機械工業株式会社 | Manual transmission reverse idler gear mounting structure |
| CN100366948C (en) * | 2002-02-20 | 2008-02-06 | 雅马哈发动机株式会社 | Balance device for engines |
| CN1981120B (en) * | 2004-07-08 | 2010-05-05 | 雅马哈发动机株式会社 | Power unit and saddle riding-type vehicle with the same |
| JP2008014351A (en) * | 2006-07-04 | 2008-01-24 | Hitachi Ltd | Engine balancer device |
| CN201100170Y (en) * | 2007-10-31 | 2008-08-13 | 郑凌 | Gas engine dynamic distribution system |
-
2009
- 2009-02-16 JP JP2009032817A patent/JP4984093B2/en not_active Expired - Fee Related
-
2010
- 2010-02-12 CN CN2010101200736A patent/CN101806245B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103119252A (en) * | 2010-10-22 | 2013-05-22 | 川崎重工业株式会社 | Power generation system |
| CN103119252B (en) * | 2010-10-22 | 2015-04-08 | 川崎重工业株式会社 | Power generation system |
| CN102909701A (en) * | 2011-08-06 | 2013-02-06 | 苏州宝时得电动工具有限公司 | Power tool |
| CN102909701B (en) * | 2011-08-06 | 2015-12-30 | 苏州宝时得电动工具有限公司 | Power tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4984093B2 (en) | 2012-07-25 |
| JP2010190260A (en) | 2010-09-02 |
| CN101806245B (en) | 2012-06-27 |
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