GB2461869A - Pinion mounting and pretensioning of traction means - Google Patents
Pinion mounting and pretensioning of traction means Download PDFInfo
- Publication number
- GB2461869A GB2461869A GB0812799A GB0812799A GB2461869A GB 2461869 A GB2461869 A GB 2461869A GB 0812799 A GB0812799 A GB 0812799A GB 0812799 A GB0812799 A GB 0812799A GB 2461869 A GB2461869 A GB 2461869A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drive
- drive pinion
- traction
- pinion
- traction means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
- F16H7/14—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of a driving or driven pulley
- F16H7/16—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of a driving or driven pulley without adjusting the driving or driven shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/24—Equipment for mounting belts, ropes, or chains
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
Traction drive, comprising a drive shaft 10, a drive pinion 12 mountable to the drive shaft 10 and a traction means 14, preferably a belt or chain, mountable to the drive pinion 12, whereas the rotational axis of the drive pinion 12 is eccentrically arranged to the rotational axis of the drive shaft 10 during the mounting of the traction means 14 to the drive pinion 12, whereas the mounted traction means 14 is pretensioned by centering the rotational axis of the drive pinion 12 to the rotational axis of the drive shaft 10. This traction drive assembly provides an easier fitting and/or changing of the traction means 14 without the need of using any kind of special tool. In a preferred embodiment the pinion 12 has conical recesses 22, and is centered and tensioned by conical matching parts 24 cooperating with the conical recesses 22 when the mounting means 18 is tightened into the thread 20.
Description
Traction Drive
Description
The invention relates to the field of traction drive assemblies.
Traction drive assemblies used in motor vehicles provide a coupling between an engine, especially a combustion engine, and auxiliaries like power generation, cooling or air conditioning.
It is known that tension devices are arranged in the route of the traction means of the traction drive assemblies which care for a secure power transmission between drive system and auxiliaries.
The tension devices may be deflection pulleys whose attachment may provide spring pretension for balancing the expansion of the traction means. Moreover, tension devices shaped as screw-type gearings are known, whereas the expansion of the traction means may be balanced by manual adjustment.
These tension devices are additional devices in a motor vehicle which need additional space. This causes problems since the space in an engine compartment is limited.
No tension devices are needed if the expansion of the traction means is insignificant. But a problem is the mounting of these traction means at the traction drive.
Especially when fitting or changing these traction means a lot of effort or special tool is needed.
It is the object of the invention to provide a traction drive and a method for mounting a traction drive, whereas the traction means may easier be fitted and/or changed without the need of using any kind of special tool.
The solution of the object is achieved by the features of claim 1 and claim 7. Preferred embodiments are given by the dependent claims.
The traction drive according to the invention comprises a drive shaft, a drive pinion mountable to the drive shaft and a traction means mountable to the drive pinion, whereas the rotational axis of the drive pinion is eccentrically arranged to the rotational axis of the drive shaft during the mounting of the traction means to the drive pinion, whereas the mounted traction means is pretensioned by centering the rotational axis of the drive pinion to the rotational axis of the drive shaft.
The traction means may be a belt or a chain. When mounting the traction means to the drive pinion the drive pinion is disengaged from the drive shaft, whereas the rotational axis of the drive pinion is eccentrically arranged to the rotational axis of the drive shaft. The drive pinion is radially movable in a defined area. Due to the radial movability of the drive pinion the traction means may easily be positioned at the drive pinion without much effort and without the need of any kind of special tool. This improves the serviceability. Having mounted the traction means to the drive pinion the drive pinion is fixed to the drive shaft, whereas the rotational axis of the drive pinion is centered to the rotational axis of the drive shaft. By centering the drive pinion to the drive shaft the movability of the drive pinion is eliminated, form and/or force closure of the traction drive is achieved and furthermore the traction means is automatically pretensioned without the need of any additional components like tension devices.
The package is optimized and costs are reduced.
Preferably, the drive pinion provides a through hole along its rotational axis for mounting the drive pinion to the drive shaft with mounting means, whereas the cross section of the through hole is bigger than the cross section of the mounting means, so that the traction means can be assembled due to radial tolerance of the drive pinion when the mounting means is disengaged. A screw may be used as mounting means. The drive shaft provides a thread in which the mounting means is fastened when centering the drive pinion to the drive shaft. For mounting the traction means to the drive pinion the mounting means is disengaged. Due to the fact that the cross section of the through hole of the drive pinion is bigger than the cross section of the mounting means the drive pinion is radially movable about the difference between the cross section of the through hole and the cross section of the mounting means. The difference between the cross section of the through hole and the cross section of the mounting means determine the maximum of the possible radial movement of the drive pinion. If the mounting means is disengaged and therefore the drive pinion is radially movable the traction means may easily be mounted to the drive pinion.
According to the invention the drive pinion, the drive shaft and the mounting means preferably provide means for self alignment when mounting to each other.
These means of self alignment guarantee that the drive shaft and the drive pinion are mounted to each other in an exactly defined position to reach an optimal centering of the drive shaft, the drive pinion and the mounting means. Due to the centering the traction means is automatically pretensioned by assembling the drive shaft, the drive pinion and the mounting means without additional tension devices.
In a preferred embodiment the means for self alignment is formed as such that the drive pinion provides recesses and the drive shaft and the mounting means provide suitable matching parts for the recesses.
The recesses are arranged opposite to each other at the longitudinal side of the drive pinion. Preferably, the recesses are arranged coaxial to the rotational axis of the drive pinion. The recesses and the suitable matching parts for the recesses, respectively, guarantee that the drive shaft and the drive pinion are mounted to each other in an exactly defined position by self alignment to reach an optimal centering of the drive shaft, the drive pinion and the mounting means.
The recesses are preferably conically shaped. The conical shape is easy to manufacture and it allows an optimal joining. The suitable matching parts for the recesses provide a conical protuberance formed with about the same size as the recesses are so that the recesses and the matching parts for the recesses exactly fit to each other. During pretensioning of the traction means strong forces occur due to the lengthwise expansion of the traction means. During pretensioning of the traction means strong fores occur due to the lengthwise expansion of the traction means when using a screw as mounting means.
But by reason of the inclined surface of the cone a form of lever transmission is set up so that only comparable low fastening forces are to be applied by the mounting means for pretensioning the traction means.
Preferably the mounting means is a screw that is seized by a wrench. Its maximum allowable diameter and hence the maximum applicable fastening force is given by the diameter of the drive shaft. So if a high fastening force can be applied it is sufficient for pretensioning the traction means if the angle of the cone is obtuse and the flank of the cone is precipitous. By using smaller screws resulting in less fastening force a lower slope of the flank providing more lever force is required for obtaining the needed pretension of the traction means. So the conical shape is preferably formed as such that the angle of the cone is adapted to the fastening force or torque that can be applied by the mounting means.
Furthermore, the invention relates to a method for mounting a traction drive as previously described whereas a traction means is mounted to a drive pinion which is mountable to a drive shaft. At a first step the drive pinion is arranged eccentrically with its rotational axis to the rotational axis of the drive shaft and the traction means is mounted on the drive pinion. At a second step the drive pinion together with the traction means is mounted to the drive shaft by centering the rotational axis of the drive pinion to the rotational axis of the drive shaft, whereas the traction means is automatically pretensioned.
When mounting the traction means to the drive pinion the drive pinion is disengaged from the drive shaft, whereas the rotational axis of the drive pinion is eccentrically arranged to the rotational axis of the drive shaft. The drive pinion is radially movable in a defined area. Due to the radial movability of the drive pinion the traction means may easily be positioned at the drive pinion without much effort and without the need of any kind of special tool. This improves the serviceability. Having mounted the traction means to the drive pinion the drive pinion is fixed to the drive shaft, whereas the rotational axis of the drive pinion is centered to the rotational axis of the drive shaft. By centering the drive pinion to the drive shaft the movability of the drive pinion is eliminated, form and/or force closure of the traction drive is achieved and furthermore the traction means is automatically pretensioned without the need of any additional components like tension devices. The package is optimized and costs are reduced.
Furthermore, preferably, at the first step a mounting means is inserted in a through hole of the drive pinion for mounting the drive pinion to the drive shaft, whereas the ratio of the cross section of the through hole to the cross section of the mounting means is formed in such a manner that the traction means can be assembled due to radial clearance when mounting means is disengaged. For mounting the traction means to the drive pinion the mounting means, for example a screw, is disengaged. The ratio of the cross section of the through hole of the drive pinion to the cross section of the mounting means is developed in such a manner that the drive pinion is radially movable about the difference between the cross section of the through hole and the cross section of the mounting means. The difference between the cross section of the through hole and the cross section of the mounting means determine the maximum of the possible radial movement of the drive pinion. If the mounting means is disengaged and therefore the drive pinion is radially movable the traction means may easily be mounted to the drive pinion.
Additionally, the invention relates to a motor vehicle comprising a traction drive and the mounting of the traction drive as previously described.
These and other aspects of the invention will be apparent from and elucidated with reference to a preferred embodiment described hereinafter.
In the drawings: Fig. 1 is a schematic sectional view of the steps of mounting a traction drive according to the invention, Fig. 2 is a schematic side view of a mounted traction drive according to the invention and Fig. 3 is a schematic sectional lateral view of the traction drive of Fig. 2.
Fig. 1 shows a schematic sectional view of a traction drive, especially of the steps of mounting a traction drive according to the invention. The traction drive according to the invention comprises a drive shaft 10, a drive pinion 12 mountable to the drive shaft 10 and a traction means 14 mountable to the drive pinion 12. The traction means 14 may be belt or a chain.
The view of the drive pinion 12 on the right side shows the drive pinion 12 in a disengaged position to the drive shaft 10. The drive pinion 10 is radially movable in a defined area. Due to the radial movability of the drive pinion 12 the traction means 14 may easily be positioned at the drive pinion 12. This shows a first step of mounting the traction drive, whereas the drive pinion 12 is arranged eccentrically with its rotational axis to the rotational axis of the drive shaft 10 and the traction means 14 is mounted on the drive pinion 12.
The drive pinion 12 provides a through hole 16 along its rotational axis for mounting the drive pinion 12 to the drive shaft 10 with a screw 18. The drive shaft 10 provides a thread 20 in which the screw 18 is fastened when mounting the drive pinion 12 to the drive shaft 10.
For mounting the traction means 14 to the drive pinion 12 the screw 18 is disengaged. The cross section of the through hole 16 is bigger than the cross section of the screw 18, so that the traction means 14 can be assembled due to radial tolerance of the drive pinion 12 when the screw 18 is disengaged. The maximum radial tolerance results from the difference between the cross section of the through hole 16 and the cross section of the screw 18.
The view of the drive pinion 12 on the left side shows a second step of mounting the traction drive, whereas the drive pinion 12 is in a mounted position to the drive shaft 10. There, the drive pinion 12 is mounted to the drive shaft 10 by centering the rotational axis of the drive pinion 12 to the rotational axis of the drive shaft 10 by fastening the screw 18. By centering the drive pinion 12 to the drive shaft 10 the movability of the drive pinion 12 is eliminated, form and/or force closure of the traction drive is achieved and the traction means 14 is automatically pretensioned. In this position all parts of the traction drive are joint with each other and the traction means is automatically pretensioned without additional means.
The drive pinion provides 12 two recesses 22 along its rotational axis, whereas the recesses 22 are arranged opposite to each other at the longitudinal side of the drive pinion 12. The recesses 22 are arranged in a centered position along the rotational axis of the drive pinion 12. The recesses 22 are conically shaped. The drive shaft 10 and the screw 18 provide suitable matching parts 24 for the recesses. Joining the matching parts 24 to the recesses 22 self alignment is achieved by mounting the drive pinion 12 to the drive shaft 10. The recesses 22 and the suitable matching parts 24 for the recesses, respectively, guarantee that the drive shaft 10 and the drive pinion 12 are mounted to each other in an exactly defined position by self alignment to reach an optimal centering of the drive shaft 10, the drive pinion 12 and the screw 18. Due to the centering the traction means 14 is automatically pretensioned by assembling the drive shaft 10, the drive pinion 12 and the screw 18 without additional tension devices.
Fig. 2 shows a schematic side view of a mounted traction drive according to the invention. The traction means 14 is mounted to the drive pinion 12, whereas the drive pinion 12 is mounted to the drive shaft by the fastened screw 18. The exact centered position of the screw 18 is achieved by the matching part 24.
Fig. 3 shows a schematic sectional lateral view of the traction drive of Fig. 2, whereas the traction drive is mounted. The rotational axis of the drive pinion 12 is centered to the rotational axis of the drive shaft 10 by the fastened screw 18 and the matching parts 24 are joint to the recesses 22. The traction means is mounted to the drive pinion 12 in a tensioned position by centering the drive pinion 12 to the drive shaft 10. When the screw 18 -10 -is fastened and the traction drive is mounted the driving power may be transmitted by form or force closure.
Reference signs 10 Drive shaft 12 Drive pinion 14 Traction means 16 Through hole 18 Mounting means 20 Thread 22 Recess 24 Matching part for the recess
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0812799A GB2461869A (en) | 2008-07-12 | 2008-07-12 | Pinion mounting and pretensioning of traction means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0812799A GB2461869A (en) | 2008-07-12 | 2008-07-12 | Pinion mounting and pretensioning of traction means |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0812799D0 GB0812799D0 (en) | 2008-08-20 |
| GB2461869A true GB2461869A (en) | 2010-01-20 |
Family
ID=39722205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0812799A Withdrawn GB2461869A (en) | 2008-07-12 | 2008-07-12 | Pinion mounting and pretensioning of traction means |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2461869A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1085200A (en) * | 1966-09-02 | 1967-09-27 | Koenig & Bauer Schnellpressfab | Means for fitting endless belts on pulleys at fixed distances apart |
| GB2197707A (en) * | 1986-11-20 | 1988-05-25 | Flender A F & Co | Belt drive tensioning arrangement |
-
2008
- 2008-07-12 GB GB0812799A patent/GB2461869A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1085200A (en) * | 1966-09-02 | 1967-09-27 | Koenig & Bauer Schnellpressfab | Means for fitting endless belts on pulleys at fixed distances apart |
| GB2197707A (en) * | 1986-11-20 | 1988-05-25 | Flender A F & Co | Belt drive tensioning arrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0812799D0 (en) | 2008-08-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S30Z | Assignments for licence or security reasons |
Free format text: APPLICANT GM GLOBAL TECHNOLOGY OPERATIONS, INC SECURITY TO THE UNITED STATES DEPARTMENT OF THE TREASURY |
|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |