Hydraulic automatic tensioner for auxiliary device
A hydraulic and tensioner technology, applied in the direction of transmission, mechanical equipment, belt/chain/gear, etc., can solve problems such as hindering the damping function
Inactive Publication Date: 2015-06-24
NTN CORP
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Problems solved by technology
[0011] In the hydraulic automatic tensioner, the lower end surface of the sleeve is located above the lower surface of the valve seat of the check valve installed in the lower end of the sleeve, and the lower end surface of the sleeve is fitted with the sleeve fitting hole. There is a gap between the bottom surfaces of the hydraulic tensioner, so if the burr generated during the press fit falls off, it will flow through the oil passage from the gap and be mixed and floated in the hydraulic oil, buffering the pressing force applied to the hydraulic automatic tensioner. When, bite into the leakage gap, non-return valve, which may hinder the damping function
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Embodiment Construction
[0054] Embodiments of the present invention will be described below based on the drawings. Such as figure 1 As shown, the cylinder block 1 has a bottom, and a connecting piece 2 connected to the engine block is arranged on the lower surface of the bottom. The cylinder block 1 is made of aluminum alloy and formed by die-casting or forging. When die-casting, if a non-porous die-casting method (PF die-casting method) is adopted, a high-quality cylinder block 1 free of casting trachoma can be obtained.
[0055] The connecting piece 2 is provided with a shaft insertion hole 2a penetrating from one side to the other side, and a cylindrical fulcrum shaft 2b and a sliding bearing 2c that supports the fulcrum shaft 2b in a freely rotatable manner are inserted into the shaft insertion hole 2a. The fulcrum shaft 2b is fixed by tightening bolts inserted through the fulcrum shaft 2b and screwed into the engine block, so that the cylinder block 1 is attached so as to be able to swing aro...
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Abstract
A hydraulic automatic tensioner for an auxiliary device is configured in such a manner that a sleeve fitting hole (3) is provided in the upper surface of the bottom of a cylinder (1) in which hydraulic oil is contained, the lower end of a sleeve (4) is press-fitted into the sleeve fitting hole (3), and the lower end of a rod (5) is inserted in a slidable manner into the sleeve (4) to form a pressure chamber (6) within the sleeve (4). The lower end surface of the sleeve (4) is brought into contact with the divided bottom surfaces (3a) of the sleeve fitting hole (3), and burrs formed when press-fitting the lower end of the sleeve (4) into the sleeve fitting hole (3) are gripped between the divided bottom surfaces (3a) of the sleeve fitting hole (3) and the lower end surface of the sleeve (4). As a result, the burrs are prevented from mixing into the hydraulic oil.
Description
technical field [0001] The present invention relates to a hydraulic automatic tensioner for adjusting the tension of an auxiliary machine driving belt that drives an automobile auxiliary machine such as an alternator, a water pump, and an air conditioner compressor. Background technique [0002] In belt transmissions that transmit the rotation of the crankshaft of the engine to various automotive accessories such as alternators, such as Figure 23 As shown, on the slack side of the belt 81, a pulley arm 83 that can swing around the shaft 82 is provided, and the adjustment force of the hydraulic automatic tensioner A is applied to the pulley arm 83, and the pulley arm 83 is supported toward the A rotatable tension pulley 84 at the swing side end of the pulley arm 83 applies force in a direction to press the belt 81 to keep the tension of the belt 81 constant. [0003] As the hydraulic automatic tensioner A for auxiliary machinery used in the above-mentioned belt transmission,...
Claims
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IPC IPC(8): F16H7/12B22D17/00
CPCF16H7/0836F16H2007/0806F16H2007/0859F16H7/1236F16H2007/0814F16H2007/0893F16H7/0848
Inventor 北野聪深堀刚里村爱作山田政义
Owner NTN CORP