Rack guide, and rack and pinion steering device with rack guide
A rack guide, rack rod technology, applied in belt/chain/gear, steering gear, steering mechanism, etc., can solve the problem of difficult to achieve molding with good dimensional accuracy, difficult to slide support rack rod smoothly, deformation, etc.
Inactive Publication Date: 2014-04-02
OILES CORP
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- Abstract
- Description
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- Application Information
AI Technical Summary
Problems solved by technology
In the case of the rack guide made of iron-based sintered metal, although it has sufficient mechanical strength against the impact load from the rack bar, it has the potential to reduce the efficiency of the steering system due to the large sliding frictional resistance. operational issues
As for the rack guide made of synthetic resin, although it can reduce the sliding frictional resistance on the contrary, it encounters the following problem: its mechanical strength against impact load is poor
It is subjected to dimensional changes due to such as molding shrinkage, so that it is difficult to achieve molding with good dimensional accuracy, and it is difficult to maintain dimensional accuracy after molding
In addition, after being placed in the housing, it is affected by the temperature rise of the steering gear and undergoes thermal expansion and contraction, which causes thermal deformation and creep, making it difficult to smoothly slide the support rack bar
Method used
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Experimental program
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Embodiment
[0048] exist Figures 1 to 8 Among them, the rack-and-pinion type steering device 1 according to this embodiment includes: a gear case 3 having a hollow portion 2; The axis is rotatably supported in the hollow portion 2 of the gearbox 3; the pinion 7, which is supported by being integrally provided on the shaft end of the steering shaft 6, and is rotatably in the R direction through the steering shaft 6 Provided in the hollow portion 2 of the gear case 3; a rack bar 10 having rack teeth 8 engaged with the pinion 7 and having a predetermined radius of curvature on its rear surface relative to the rack teeth 8 The arc-shaped outer peripheral surface 9; the rack guide 11, which is movably provided in the hollow portion 2 of the gear case 3 and guides and supports the rack bar 10 movably in the axial direction A; and A coil spring 12 serving as elastic means provided in the hollow portion 2 of the gear case 3 and elastically urges the rack teeth 8 of the rack bar 10 toward the pi...
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A rack and pinion steering device (1) is provided with a gear case (3), a steering shaft (6) which is supported in a rotatable manner in the hollow section (2) of the gear case (3), a pinion (7) which is provided integrally to an end of the steering shaft (6), a rack bar (10) which has rack teeth (8) meshing with the pinion (7), a rack guide (11) which guides and supports the rack bar (10) in a movable manner, and a coiled spring (12) which serves as the elastic means which elastically presses the rack teeth (8) toward the pinion (7) through the rack guide (11).
Description
technical field [0001] The present invention relates to a rack guide and a rack-pinion type steering device having the rack guide. Background technique [0002] A rack-and-pinion type steering device generally includes a gear case, a pinion gear, a rack bar, a rack guide, and a coil spring. A rack tooth, a rack guide is provided inside the gear case to slidably support the rack bar, and a coil spring is used to urge the rack guide toward the rack bar. [0003] In the rack-pinion type steering device, iron-based sintered metal or synthetic resin is used as a rack guide that slidably supports a rack bar. In the case of the rack guide made of iron-based sintered metal, although it has sufficient mechanical strength against the impact load from the rack bar, it has the potential to reduce the efficiency of the steering system due to the large sliding frictional resistance. operational issues. As for the rack guide made of synthetic resin, although it is conversely capable of ...
Claims
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Login to View More IPC IPC(8): B62D3/12
CPCF16H55/283B62D3/123
Inventor 山下英一中川昇金城雅也
Owner OILES CORP