CN102338207A

CN102338207A - Case of transmission

Info

Publication number: CN102338207A
Application number: CN2011101893147A
Authority: CN
Inventors: 河合优
Original assignee: JATCO Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2010-07-20
Filing date: 2011-07-07
Publication date: 2012-02-01
Anticipated expiration: 2031-07-07
Also published as: JP5108921B2; CN102338207B; KR101302342B1; KR20120009402A; JP2012026468A

Abstract

The invention provides a construction of a case of transmission, the construction can improve rigidity of a case and reduce sound vibration. The case (22) of a transmission receives a speed-changing mechanism (30), wherein, the case (22) is provided with a first bearing part (61) of a first rotary shaft (31) supporting the speed-changing mechanism (30) and a second bearing part (62) of a second rotary shaft (32) supporting the speed-changing mechanism (30), the case construction is provided with a reinforcing rib (66a), the reinforcing rib (66a) is disposed on a line connecting the center of the first rotary shaft (31) and the center of the second rotary shaft (32), and is installed at the outer wall apart from the case (22) between the first bearing part (61) and the second bearing part (62) and facing the outer wall.

Description

The casing of speed changer

Technical field

The present invention relates to be equipped on the casing of the speed changer of vehicle.

Background technique

The speed changer that is equipped on vehicle is that the gear that is made up of gear mechanism etc. is accommodated in casing and constitutes.Casing has the bearing of the axle of supporting gear mechanism.

In recent years, speed changer is being realized reducing fuel consumption and miniaturization, lightweight, and casing with this end in view has the trend that forms thin-walled through lightweight alloy such as aluminium.Such structure reduces the rigidity of bearing part.The reduction of casing rigidity becomes the reason that causes the gear engagement variation because of reversing of axle, becomes the acoustical vibration that brings because of the variation of engagement and increases the reason that commodity is reduced.

For the reduction of such gear housing rigidity, be well known that the load direction of axle supporting portion periphery along the engagement reaction force acts that partly produces in gear meshing in supporting portion be formed with muscle gear-box add competent structure.(with reference to patent documentation 1)

Patent documentation 1: (Japan) spy opens flat 2-266150 communique

The casing of existing speed changer has improved the rigidity of supporting portion through the muscle that extends along square with the axis direction.This muscle becomes the required shape of this torque of tolerance according to the torque of motor and speed changer.

But, in order to improve the rigidity of casing, need to increase and form more muscle, because the volume of muscle, thereby the volume of casing, weight are increased.Thus, there are the lift-launch property of relative vehicle or the problem of fuel consume variation.

In addition, if pass through the rigidity that muscle improves casing, then the gear meshing rate improves, and the acoustical vibration that produces because of speed changer reduces.On the other hand, under the situation of the rigidity that has improved casing, there is the problem that effect dies down that reduces of acoustical vibration in vibration easily in the tank surface transmission.

Summary of the invention

The present invention sets up in view of such problem, and its purpose is to provide a kind of raising casing rigidity and improves the gear meshing rate, and reduces the case construction of speed changer of the acoustical vibration of casing.

According to an embodiment of the present invention; A kind of casing of speed changer is provided; It takes in gear, it is characterized in that, is formed with the clutch shaft bearing portion of first running shaft that supports gear and the second bearing portion of supporting second running shaft of gear at casing; And possessing stiffening rib, this stiffening rib is assembled away from the outer wall of casing and with outer wall between the clutch shaft bearing portion and the second bearing portion on the line at the center of the center that links first running shaft and second running shaft in opposite directions.

According to the present invention; Owing between the clutch shaft bearing portion and the second bearing portion, having, therefore, can improve the rigidity between first running shaft and second running shaft away from the outer wall of casing and the stiffening rib that is assembled in opposite directions with cabinet exterior; The acoustical vibration that reduction is produced by speed changer; And, can weaken transfer of vibration through outer wall and stiffening rib, reduce to pass to the vibration of casing.

Description of drawings

Fig. 1 is the explanatory drawing of the speed changer of embodiment of the present invention;

Fig. 2 is the front elevation of the speed change shell of embodiment of the present invention;

Fig. 3 is the sectional drawing of the speed change shell of embodiment of the present invention;

Fig. 4 is the sectional drawing of the speed change shell of embodiment of the present invention;

Fig. 5 is the stereogram of the speed change shell of embodiment of the present invention.

Symbol description

10 speed changers

20 casings

21 transducer shells

22 transmission case

30 gears

31 input shafts (first running shaft)

32 output shafts (second running shaft)

40 actuating force source

41 bent axles

50 fluid torque converters

60 outer walls

61 through holes (clutch shaft bearing portion)

62 through holes (the second bearing portion)

66 add competent structure

The 66a stiffening rib

Embodiment

Below, with reference to accompanying drawing mode of execution of the present invention is described.

Fig. 1 is the explanatory drawing of the speed changer 10 of embodiment of the present invention.

Speed changer 10 is made up of casing 20, the gear 30 that is accommodated in casing 20 and fluid torque converter 50.

Speed changer 10 carries out speed change through 30 pairs of rotations from actuating force source 40 inputs of gear, and the rotation behind the output variable speed.Actuating force source 40 is made up of internal-combustion engines such as for example motor or motor.

Fluid torque converter 50 is crossed the action fluid with the rotating tee of live axle and is carried out torque and amplify or directly link through locking, is passed to the input shaft 31 of gear 30.Gear 30 carries out speed change and output with this rotation.The rotation of output is delivered to vehicle from output shaft 32, thus powered vehicle.Promptly, output shaft 32 is terminal transmission shaft.

Casing 20 is made up of the transducer shell 21 of taking in fluid torque converter, the transmission case 22 of taking in gear.

Transducer shell 21 is accommodated in inside with fluid torque converter 50, and, the bent axle 41 of rotatably mounted actuating force source 40 and the input shaft 31 of gear 30.

Transmission case 22 is accommodated in inside with gear 30, and, running shaft such as rotatably mounted input shaft 31, output shaft 32.

The structure of the transmission case 22 that constitutes so then, is described.

Fig. 2 is for from representing the front elevation of transmission case 22 with the involutory surface of transducer shell 21.Fig. 3 is the A-A sectional drawing of Fig. 2, and Fig. 4 is the B-B sectional drawing of Fig. 2.In addition, Fig. 5 be from the observed stereogram of involutory surface of the transducer shell 21 of transmission case 22.

Transmission case 22 is by being positioned at the outer wall 60 of transducer shell 21 opposition sides, around this outer wall 60, erecting the perisporium 65 that is formed at transducer shell 21 sides and constitute.Recess in that outer wall 60 and perisporium 65 surround is taken in gear 30.Provided a plurality of bolt hole 65a at perisporium 65, under the state of taking in gear 30, it is tightened through bolt etc. and transducer shell 21 1.

Gear 30 also has the 3rd running shaft 33 and the 4th running shaft 34 except having above-mentioned input shaft 31 (first running shaft) and output shaft 32 (second running shaft).The 3rd running shaft 33 and input shaft 31 engagements rotate along with the rotation of input shaft 31.The 4th running shaft 34 and the engagement of the 3rd running shaft are rotated along with the rotation of the 3rd running shaft 33.

Output shaft

32 and 34 engagements of the 4th running shaft are rotated along with the rotation of the 4th running shaft 34.

Transmission case 22 is formed with the through

hole

61,62,63 and 64 that these input shafts 31, output shaft 32, the 3rd running shaft 33 and the 4th running shaft 34 connect respectively.After input shaft 31, output shaft 32, the 3rd running shaft 33 and the 4th running shaft 34 connect through

hole

61,62,63 and 64 respectively, they are fixed via bearing etc.Thus, through

hole

61,62,63 and 64 is as the bearing portion of input shaft 31, output shaft 32, the 3rd running shaft 33 and the 4th running shaft 34 and bring into play function.

Gear 30 is accepted the rotation from actuating force source 40, through pitch wheel etc. with this rotational delay, therefore, the direction generation power of repelling each other along axle and axle between each (below be called " between centers power ").In addition, between each, along an axle and a directive effect power of reversing.The through

hole

61,62,63 of

transmission case

22 and 64 suppresses these and the between centers power of axle and reversing of axle, supports each simultaneously.

On the other hand, the between centers that rotates being meshing with each other since these with axle between the power that acts on the between centers power that acts on and the torsional direction, thereby make gear meshing rate variation, ringing etc. because of gear produces noise.In order to prevent generation of noise, it is effective improving these through

hole

61,62,63 and the rigidity of 64 periphery of supporting.

In the existing speed changer; The periphery of the through hole 62 that connects at the maximum output shaft 32 of torque, from outer wall 60 to output shaft 32 axially (with the direction of outer wall vertical on) erect and form and be configured to radial longitudinal rib, utilize the rigidity of this longitudinal rib; Suppress between centers power, prevented reversing of axle.

Existing longitudinal rib like this through in the upper end of longitudinal rib and lower end (outer wall) utilize and stretch or the compressive stress supporting axle, thereby suppress between centers power, prevent reversing and improving rigidity of axle.But, because the volume of the intermediate portion of this longitudinal rib is neutral with respect to stress, so the effect of intermediate portion raising rigidity is less.

In addition, the structure of existing longitudinal rib for erecting at outer wall 60, therefore, only the height of longitudinal rib just makes transmission housing 22 increase, and weight also increases.Therefore, can make the lift-launch property variation of 10 pairs of vehicles of speed changer.

So the transmission case 22 of embodiment of the present invention is improved the volume of acoustical vibration, casing and weight aspect through the particular structure of following explanation.

As shown in Figure 2, between the through hole 62 that through hole 61 that input shaft 31 connects and output shaft 32 connect, possess the competent structure of adding 66.

In gear 30, the revenue and expenditure of the torque that the speed change of rotation produces is accomplished between by intermeshing input shaft 31, the 3rd running shaft 33, the 4th running shaft 34 and output shaft 32 area surrounded.What therefore, between input shaft 31 and output shaft 32, possess the rigidity that is used to improve these adds competent structure 66.

Adding competent structure 66 possesses from the outer wall 60 of transmission case 22 and separates the stiffening rib 66a of some distances with the peripheral bond of the periphery of through hole 61 and through hole 62.Stiffening rib 66a with input shaft 31 axially and the direction of the axial approximate vertical of output shaft 32 opposed away from the outer wall of transmission case 22.In addition, stiffening rib by with through hole 61 axially and the face that intersects of the axial approximate right angle direction of through hole 62 constitute.

Stiffening rib 66a be located at least the axle that links input shaft 31 center and output shaft 32 spool the line at center on.That is, in the plan view of Fig. 2, the position of line at center of axle of center and output shaft 32 that has linked the axle of input shaft 31 in projection possesses stiffening rib 66a at least, through the periphery of this stiffening rib 66a binding through hole 61 and the periphery of through hole 62.

In addition, the outer wall 60 of transmission case 22 differs and is decided to be planar, and therefore, outer wall 60 not necessarily needs parallel with stiffening rib 66a.With respect to the outer wall 60 that links through hole 61 and through hole 62, the stiffening rib 66a that links through hole 61 and through hole 62 is set in the position relative with it.

Show that with reference to Fig. 3 stiffening rib 66a and outer wall 60 link at upside (through hole 63 sides of stiffening rib 66a), be released at downside (stiffening rib 66a with opposition side through hole 63).That is, form the bag shape space of open lower side through stiffening rib 66a and outer wall 60.

In addition; Can show with reference to Fig. 4; With respect to the outer wall 60 of the periphery of periphery that links through hole 61 in the inboard of through hole 61 and through hole 62 (opposition side of transducer shell 21) and through hole 62, stiffening rib 66a forms with the mode in the periphery of the periphery of front side (transducer shell 21 sides) the binding through hole 61 of through hole 61 and through hole 62 and through hole 62.

Promptly, in adding competent structure 66, constitute the shape of bag shape that the outer wall 60 by the outer peripheral portion of the outer peripheral portion of stiffening rib 66a, through hole 61, through hole 62 and the position relative with stiffening rib 66a surrounds.Stiffening rib 66a links through the outer peripheral portion of through hole 61, the outer peripheral portion of through hole 62 and the outer wall of through hole 63 sides.Thus, be formed in the 3rd through hole 63 the opposition side opening the bag shape shape.

Can show that with reference to Fig. 5 this shape that adds the bag shape in the competent structure 66 is at downside (opposition side of through hole 63) opening.In addition, the dash area among Fig. 5 is represented interior all sides of shape of the bag shape of outer wall 60.

Below, the effect of the structure of the casing 20 of the speed changer 10 of the mode of execution of the present invention of formation like this is described.

32 effects have between centers power with output shaft at these input shafts 31 through between input shaft 31 and output shaft 32, carrying out torque that speed change produces, and effect is strong on the direction that axle and axle reverse.Therefore; Bear in supporting between the through hole 61 and through hole 62 of input shaft 31 and output shaft 32 of the power that acts on the torsional direction of this between centers power and axle and axle, possess the outer wall 60 through transmission case 22 and the stiffening rib 66a formation that is oppositely arranged with outer wall 60 add competent structure 66.

This adds competent structure 66 and stretches or compressive stress in the front side (transducer shell 21 sides) and the inboard supporting of through hole 61 and through hole 62; Therefore; The same between centers power that can suppress input shaft 31 and output shaft 32 with the existing longitudinal rib that uses, prevent axle with spool reverse, thereby can improve rigidity.

In addition, it is not solid adding competent structure 66, between outer wall 60 and stiffening rib 66a, forms the shape of marsupial shape, therefore, has suppressed the increase of the weight of transmission case 22.In addition, stiffening rib 66a is by constituting towards the axial face that reaches the direction that axially roughly meets at right angles of through hole 62 with through hole 61, and therefore, adding competent structure 66 can be outstanding to the outside, and transmission case 22 can not maximize.These are corresponding to the effect of first aspect present invention and second aspect.

In addition, add the periphery that competent structure 66 is arranged at the output shaft 32 of the torque maximum effect in the gear 30, therefore, the between centers power that can prevent output shaft 32 and axle with spool reverse, can improve the rigidity of transmission case 22.This is corresponding to the effect of fourth aspect present invention.

In addition, the acoustical vibration that competent structure 66 can reduce speed changer 10 that adds through this mode of execution.

As stated,, suppress the between centers power of input shaft 31 and output shaft 32 through adding the rigidity that competent structure 66 improves transmission case 22, prevent axle with spool reverse, thus, can improve the parallelism of between centers.Consequently, the gear meshing rate improves between input shaft 31 and output shaft 32, can suppress the acoustical vibration that is produced by gear 30.

In addition, as stated, in order to suppress between centers power; Suppress the reversing of axle of axle and axle,, can improve rigidity thus through the front side and the inboard of stiffening rib 66a and outer wall 60 binding through

holes

61 and 62; Therefore, stiffening rib 66a can for the thickness of outer wall 60 same levels.Thus, the independent separately rigidity of outer wall 60 and stiffening rib 66a is compared with the existing longitudinal rib that uses and is diminished.This just means through the competent structure 66 that adds of outer wall 60 and stiffening rib 66a formation compares with the existing longitudinal rib that uses, and transfer of vibration is less.

Therefore, promptly add competent structure 66, can bring into play the effect that can reduce the acoustical vibration that produces by gear 30 and these two effects of effect that can reduce the transfer of vibration on the transmission case 22 simultaneously through being equipped with hollow bag columnar structure in transmission case 22.Thus, can reduce the acoustical vibration of speed changer 10.This is corresponding to the effect of third aspect present invention.

In addition, gear 30 illustrations of this mode of execution through input shaft 31, four running shafts of output shaft 32, the 3rd running shaft 33 and the 4th running shaft 34 carry out the structure of speed change, but are not limited to this.As long as between input shaft 31 and output shaft 32, carry out speed change at least, the above-mentioned competent structure 66 that adds of outfit gets final product on the line at the center of center that links the through hole 61 that this input shaft 31 and output shaft 32 connect and through hole 62.

In addition, gear 30 also can be through will being with or chain roll hangs on the belt wheel, through changing that its volume is hung diameter and the formations such as Belt-type Adjustable-speed mechanism of speed change can also be constituting by a plurality of gears such as planetary gears.

The present invention is not limited to above-mentioned mode of execution, is also contained in various changes, the improvement carried out in its technological thought scope certainly.

Claims

1. the casing of a speed changer is taken in gear, it is characterized in that,

Be formed with the clutch shaft bearing portion of first running shaft that supports said gear and the second bearing portion of supporting second running shaft of said gear at said casing,

The casing of this speed changer possesses stiffening rib, and this stiffening rib is assembled away from the outer wall of said casing and with said outer wall on the line at the center of center that links said first running shaft and said second running shaft in opposite directions.

2. the casing of speed changer as claimed in claim 1 is characterized in that, said stiffening rib by with said clutch shaft bearing portion axially and the face that intersects of axial about right angle orientation of the said second bearing portion constitute.

3. according to claim 1 or claim 2 the casing of speed changer is characterized in that, said casing is formed with the shape of the bag shape that the outer wall by said stiffening rib, said clutch shaft bearing portion, the said second bearing portion and said casing surrounds.

4. like the casing of each described speed changer in the claim 1～3, it is characterized in that said second running shaft carries out the output shaft of the rotation after the speed change through said gear for output.