JP2004197884A - Inner case structure of belt-type continuously variable transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inner case structure of a belt type continuously variable transmission capable of preventing the impairing of supporting rigidity of each rotating shaft. <P>SOLUTION: A primary pulley 2 and a secondary pulley 3 holding a V belt 9 are mounted in a transmission case 20 faced to an opening at its bottom part, and shafts of the primary pulley 2 and a counter shaft 7 are supported by the inner case 10. As the shafts are supported by the common member, the supporting rigidity of the shafts can be improved. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an inner case structure that supports each rotating shaft in a belt-type continuously variable transmission.
[0002]
[Prior art]
Conventionally, a primary pulley, a secondary pulley, a forward / reverse switching clutch, and the like are housed in a transmission case having a bottom surface facing the opening, and the opening of the transmission case is conventionally closed. There is a belt-type continuously variable transmission configured to be covered with a case cover having a converter housing. In such a belt-type continuously variable transmission, one end of a shaft of a primary pulley is supported by a case bottom facing an opening of a transmission case. The forward / reverse switching clutch is disposed in a drum-shaped inner case having a bottom at one end, and the other end of the shaft of the primary pulley is supported by a bearing formed by partially opening the bottom of the inner case. . Thereby, the shaft of the primary pulley is supported by the case bottom and the inner case.
[0003]
Furthermore, one end of the shaft of the secondary pulley is supported by the case bottom, the other end is supported by the case cover, and one end of the shaft of the counter shaft to which the rotational force from the secondary pulley is transmitted is supported by the transmission case, and the other end is supported by the case cover. are doing.
[0004]
A flange provided on the outer periphery of the opening edge of the drum-shaped inner case is fixed near the opening of the transmission case, and is arranged so that the axes of the torque converter, the forward / reverse switching clutch and the primary pulley are on the same axis. Have been.
Such a conventional belt-type continuously variable transmission is disclosed in, for example, Japanese Patent Application Laid-Open No. H10-274319.
[0005]
[Problems to be solved by the invention]
As described above, in a conventional belt-type continuously variable transmission formed by using a transmission case in which the surface facing the opening is the bottom, one end of the shaft of the primary pulley and one end of the shaft of the secondary pulley are connected to the transmission. Supported by case. The other end of the shaft of the primary pulley is supported by an inner case, which is a member separate from the transmission case, and the other end of the shaft of the secondary pulley is supported by a case cover. As described above, since the support members of the respective shafts are formed of different members, there is a problem that the support rigidity between the respective shafts is reduced.
[0006]
Accordingly, an object of the present invention is to provide an inner case structure for a belt-type continuously variable transmission in which a reduction in support rigidity of each shaft is prevented in view of such conventional problems.
[0007]
[Means for Solving the Problems]
According to the present invention, the output of the primary pulley and the secondary pulley, the primary pulley shaft and the secondary pulley shaft, and the output of the secondary pulley shaft are held in a transmission case in which the surface facing the opening is a bottom portion, which holds the endless belt. A belt-type motor that accommodates a multi-shaft transmission having a counter shaft that transmits to a differential shaft, and rotatably supports one end of a shaft of a primary pulley and a shaft of a secondary pulley by an inner bottom of a transmission case. The step transmission includes an inner case mounted inside a transmission case that rotatably supports the other end of the primary pulley shaft and rotatably supports one end of another shaft of the multi-shaft structure.
[0008]
【The invention's effect】
According to the present invention, by supporting one end of the other shaft of the multi-shaft structure by using the inner case that supports one end of the shaft of the primary pulley, a plurality of shafts are supported by a common member, thereby supporting each shaft. The rigidity can be improved.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to examples.
An inner case structure in which the present invention is applied to a belt-type continuously variable transmission mounted on a vehicle will be described with reference to FIGS.
FIG. 1 shows the internal structure of the inner case in the belt-type continuously variable transmission when viewed from the axial direction, and FIG. 2 shows a cross section taken along line AA in FIG.
A primary pulley 2 and a secondary pulley 3 as variable pulleys are accommodated in an inner bottom of a transmission case 20 having a bottom facing the opening, and a V-belt 9 as an endless belt is stretched over the pulleys 2 and 3. I have.
[0010]
A primary shaft bearing 40 and a secondary shaft bearing 41 are attached to the inner bottom wall of the transmission case 20. One end of the shaft of the primary pulley 2 is supported by the primary shaft bearing 40, and the shaft of the secondary pulley 3 is supported by the secondary shaft bearing 41. Is supported at one end.
The other end of the primary pulley 2 is connected to an engine (not shown) via a forward / reverse switching clutch 4 and a torque converter 5 having a lock-up clutch.
[0011]
The hydraulic pressure generated by the oil pump 26 using the rotational force of the engine as a power source is supplied to a primary pulley cylinder chamber 2A and a secondary pulley cylinder chamber 3A provided in each of the pulleys 2 and 3 through an oil passage (not shown).
The groove width of each pulley is controlled by the hydraulic pressure supplied to each cylinder chamber, and by changing the contact radius ratio between each pulley 2, 3 and the V-belt 9, the engine speed input to the primary pulley 2 Is steplessly converted and transmitted to the secondary pulley 3. As described above, the primary pulley 2, the secondary pulley 3, and the V-belt 9 constitute the transmission mechanism unit 15 that continuously shifts the vehicle.
[0012]
The driving force from the engine whose rotation speed has been converted by the transmission mechanism unit 15 is transmitted to the secondary pulley 3, the counter shaft 7, and the differential 8. The driving force transmitted to the differential 8 is transmitted from a differential shaft through hole 25 provided in the transmission case 20 to a vehicle wheel via a drive shaft (not shown) inserted into the differential 8.
[0013]
An inner case 10 is fitted into the inner side wall of the transmission case 20 so as to cover the primary pulley 2, the secondary pulley 3, and the counter shaft 7 on the opening side of the transmission case 20 between the primary pulley 2 and the secondary pulley 3. In particular, on the line of action of the load that the inner case 10 receives from the primary pulley 2 and the like, the outer peripheral surface of the inner case 10 and the inner side wall of the transmission case 20 are inlaid and brought into close contact.
[0014]
The inner case 10 is provided with a primary through hole 17 for installing the forward / reverse switching clutch 4, and further has a secondary through hole 17 in order to avoid contact with the outer wall of the secondary pulley cylinder chamber 3 </ b> A provided in the secondary pulley 3. 18 are provided.
[0015]
Further, a part of the inner case 10 including a part of the opening edge of the primary through hole 17 and a part of the opening edge of the secondary through hole 18 is formed to be thin to form the thin part 11. In the thin portion 11, a bearing holding recess 16 and a countershaft support shaft insertion recess 19 are formed. Counter shaft bearings 43 and 44 for supporting the counter shaft 7 are attached to both ends of the counter shaft support shaft 6. By fitting one end of the countershaft support shaft 6 into the countershaft support shaft insertion recess 19 and the countershaft bearing 43 into the bearing holding recess 16, one end of the countershaft support shaft 6 is supported by the inner case 10.
[0016]
The primary shaft support member 12 formed in a drum shape and having a positioning flange 13 at a part of an opening edge is inserted into the primary through hole 17. At the time of this inlay, the positioning of the primary shaft support member 12 is performed by aligning the thin portion 11 formed at a part of the opening edge of the primary through hole 17 with the positioning flange 13. After fitting of the primary shaft support member 12, a mounting bolt (not shown) is inserted into a mounting bolt hole 24 </ b> A provided in the positioning flange 13, and the primary shaft support member 12 and the inner case 10 are fixed.
[0017]
A spline groove is formed on the inner side wall of the primary shaft support member 12 in the cylindrical axial direction of the drum. The forward / reverse switching clutch 4 has two sets of fastening structures each including a plurality of friction plates. Of the two sets of fastening structures, the teeth of the friction plate 45 of the fastening structure provided on the outer peripheral side are fitted into the primary shaft support member 12 so as to match the splines formed on the primary shaft support member 12.
Further, the friction plate 45 is pressed by the clutch piston 39 to be in a fastened state.
[0018]
A primary shaft bearing 28 is attached to the bottom center of the primary shaft support member 12 to support the shaft of the primary pulley 2. Thereby, the shaft of the primary pulley 2 is supported by the inner case 10 via the primary shaft support member 12.
[0019]
A mounting bolt hole 24B is provided around the primary through hole 17 of the inner case 10, and a mounting bolt hole 24C is provided around the countershaft support shaft insertion concave portion 19. The inner case 10 and the transmission case 20 are fixed by inserting the mounting bolt 29B into the mounting bolt hole 24B and further inserting the mounting bolt 29C into the mounting bolt hole 24C.
Around the primary through hole 17 and around the counter shaft support shaft insertion recess 19, knock pins 22 used for positioning are provided. Further, a circuit hole 23 for passing hydraulic pressure is provided around the primary through hole 17.
[0020]
The clutch cover 30 is arranged on the primary shaft support member 12 so as to cover the opening of the primary shaft support member 12, and is fixed together with the inner case 10 to the transmission case 20 by the above-mentioned mounting bolt 29B.
When the inner case 10 and the transmission case 20 are inserted, a gap is provided in a part between the outer peripheral wall of the inner case 10 and the inner side wall of the transmission case 20. In particular, as shown in FIG. 1, a valve assembly 14 for controlling the hydraulic pressure supplied to the primary pulley cylinder chamber 2A, the secondary pulley cylinder chamber 3A and the like is provided.
[0021]
The opening of the transmission case 20 is covered by a case cover 27 having a converter housing 21 for accommodating the torque converter 5, and the case cover 27 and the transmission case 20 are fixed with mounting bolts 46.
A secondary shaft bearing 42 is attached to the case cover 27, and a counter shaft support shaft insertion recess 47 is provided. The end of the shaft of the secondary pulley 3 that is not supported by the secondary shaft bearing 41 is supported by the secondary shaft bearing 42, and the counter shaft support shaft 6 of the counter shaft support shaft 6 is further supported by the counter shaft support shaft insertion recess 47. The end that is not supported by the insertion recess 19 is supported. Thus, the counter shaft 7 is supported by the counter shaft support shaft 6 and the counter shaft bearings 43 and 44.
In this embodiment, the transmission mechanism 15, the counter shaft 7, the differential 8, and the forward / reverse switching clutch 4 constitute a transmission unit in the present invention.
[0022]
This embodiment is configured as described above. One end of the primary pulley 2 and one end of the counter shaft support shaft 6 that supports the counter shaft 7 is supported by the inner case 10. In this way, by supporting a plurality of shafts by the inner case 10 of the common member, the support rigidity of each shaft can be increased. Thus, the phenomenon that the shaft of the primary pulley 2 and the countershaft 7 is displaced due to the tension applied to the primary pulley 2 and the countershaft 7 by the V-belt 9 and the like does not occur.
In addition, by supporting each shaft with a common member, capacity design such as durability can be facilitated.
[0023]
Furthermore, by bending the inner case 10 and the transmission case 20 in close contact with each other on the line of action of the load received by the inner case 10, the bending of the inner case 10 can be prevented even when a load is applied to the inner case 10. Thus, the rigidity of the inner case 10 can be improved.
[0024]
Further, by lowering the inner case 10 and the transmission case 20 at predetermined positions, the inner case 10 can be fixed to the transmission case 20 without rattling, and at the same time, when the inner case 10 is fixed to the transmission case 20. A centering function can be provided.
[0025]
The present invention is not limited to the belt-type continuously variable transmission described in the above embodiment, but may be applied to other continuously variable transmissions as long as a plurality of shafts can be supported by the inner case 10. .
Further, in the above-described embodiment, the shaft of the primary pulley 2 and the counter shaft support shaft 6 are supported by the inner case 10, but other shafts such as the shaft of the differential 8 and the shaft of the secondary pulley 3 are supported. It may be.
[0026]
Further, an oil passage is provided in the inner case 10, and the hydraulic pressure generated by the oil pump 26 is transmitted to the transmission mechanism portion 15 as the transmission portion, the forward / reverse switching clutch 4, the countershaft 7, and the differential 8 at locations where the hydraulic pressure is required (for example, primary (A pulley cylinder chamber 2A, a secondary pulley cylinder chamber 3A, a fastening structure in the forward / reverse switching clutch 4, a bearing portion of each shaft, or the like).
As a result, the hydraulic pressure can be easily delivered to a part that requires the hydraulic pressure.
[Brief description of the drawings]
FIG. 1 is an internal structural diagram showing an embodiment of the present invention.
FIG. 2 is a diagram showing an AA cross section in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Belt-type continuously variable transmission 2 Primary pulley 3 Secondary pulley 4 Forward / reverse switching clutch 5 Torque converter 6 Counter shaft support shaft 7 Counter shaft 8 Differential 9 V belt 10 Inner case 11 Thin portion 12 Primary shaft support member 13 Positioning flange 15 Speed change Mechanism 17 Primary through hole 18 Secondary through hole 19, 47 Counter shaft support shaft insertion recess 20 Transmission case 24A, 24B, 24C Mounting bolt hole 26 Oil pump 27 Case covers 29B, 29C Mounting bolt 30 Clutch cover

Claims (4)

A primary pulley and a secondary pulley for holding an endless belt in a transmission case having a bottom facing the opening;
A multi-shaft transmission having a shaft of the primary pulley, a shaft of the secondary pulley, a counter shaft to which the output of the shaft of the secondary pulley is transmitted, and a differential shaft to which the output of the counter shaft is transmitted. Contain,
In a belt-type continuously variable transmission configured to rotatably support one end of a shaft of the primary pulley and one end of a shaft of the secondary pulley by an inner bottom portion of the transmission case,
An inner case for rotatably supporting the other end of the primary pulley shaft and at least one end of at least one of the shafts forming the multi-shaft structure except the primary pulley shaft is mounted inside the transmission case. An inner case structure in a belt-type continuously variable transmission characterized by the following. The transmission unit has a forward / reverse switching clutch,
2. An inner case structure in a belt-type continuously variable transmission according to claim 1, wherein a forward / reverse switching clutch is housed inside the inner case. When attaching the transmission case and the inner case,
2. An inner wall which rises from a bottom of the transmission case and an outer peripheral wall of the inner case are spouted at least on a line of action of a load when the inner case receives a load from the shaft rotatably supported by the inner case. Or an inner case structure in the belt-type continuously variable transmission according to 2. The belt-type continuously variable transmission has an oil pump that generates hydraulic pressure,
4. The inner case structure of the belt-type continuously variable transmission according to claim 1, wherein the hydraulic pressure generated by the oil pump is supplied to the transmission unit through an oil passage provided in the inner case. 5. .

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