Camshaft apparatus
A camshaft and bearing technology, which is applied to valve devices, valve drive devices, shafts, etc., can solve problems such as large frictional resistance, increased camshaft rotational torque, and poor engine fuel consumption performance.
Inactive Publication Date: 2012-08-15
JTEKT CORP
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Problems solved by technology
[0003] The conventional camshaft device in which all the bearings are sliding bearings uses sliding bearings, so the frictional resistance is large, so the rotational torque of the camshaft increases, and there is a problem that the fuel consumption performance of the engine deteriorates.
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[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013] figure 1 It is a partial cross-sectional view showing a camshaft device according to an embodiment of the present invention. The camshaft device C is a device for operating the intake and exhaust valves of an automobile engine, and is assembled in a housing H (cylinder head) made of an aluminum block. The camshaft device C includes: a camshaft 1 having a plurality of cams 2 ; a plurality of (four in this embodiment) sliding bearings 3 that rotatably support the camshaft 1 ; and a single rolling bearing 4 .
[0014] The camshaft 1 has: a linear shaft main body 11; figure 1 The shaft member 12 on the left side of the shaft body 11; a plurality of substantially oval cams 2 fitted on the outer periphery of the shaft main body 11. The outer diameter of the shaft member 12 is set to, for example, 18 to 20 mm, and the shaft member 12 is press-fitted into one end of...
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Disclosed is a camshaft apparatus in which a plurality of bearings rotatably support a cam shaft (1), the bearing closest to a pulley (P) being a rolling bearing (4), and the rest of the plurality of bearings being sliding bearings (3). The rolling bearing (4) comprises a roller bearing part (5) and a ball bearing part (6). The roller bearing part (5) has a first outer ring raceway surface (51), and a plurality of tube-shaped rollers (53) which roll on the first outer ring raceway surface (51). The ball bearing part (6) is disposed adjacent to the roller bearing part (5) in the axial direction, and has a second outer ring raceway surface (61) and a plurality of balls (63) which roll on the second outer ring raceway surface (61). The first outer ring raceway surface (51) and the second outer ring raceway surface (61) are formed on an inner circumferential surface (7a) of a single outer ring (7).
Description
technical field [0001] The present invention relates to a camshaft device that is rotationally driven synchronously with the rotation of an engine. Background technique [0002] In a conventional camshaft device used in an automobile engine, a camshaft having a plurality of cams for operating intake and exhaust valves is rotatably supported by a plurality of bearings (for example, refer to Patent Document 1). The support structure is as image 3 As shown, all the bearings are used as sliding bearings 41 , and between the cams 43 of the camshaft 42 are respectively supported by the sliding bearings 41 . [0003] A conventional camshaft device in which all bearings are sliding bearings has a large frictional resistance due to the use of sliding bearings, so that the rotational torque of the camshaft increases and the fuel efficiency of the engine deteriorates. In order to solve this problem, it is proposed to use rolling bearings for all bearings (for example, refer to Patent...
Claims
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IPC IPC(8): F01L1/04F02F1/24F16C17/02F16C19/28F16C19/49F16C33/58
CPCF01L1/047F01L1/053F01L2001/0476F16C17/02F16C19/49F16C21/00F16C2360/18F01L2301/00
Inventor 滨田和生上野弘臼杵功雄平冈宽规山下康太郎佐藤宽池田尚明大西良
Owner JTEKT CORP