JPS6132084Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a camshaft holding device in an engine.

Generally, a camshaft serving as a valve operating mechanism that rotates in synchronization with engine rotation, and a rocker arm shaft that swingably supports a rocker arm are fixedly supported on the cylinder head of an engine. Also,
The rocker arm shaft is hollow and has an oil passage formed in its center, and is configured to lubricate the support portion of the rocker arm and the cam sliding surface through the oil passage.

Therefore, in order to obtain stable sliding contact between the cam surface and the rocker arm, it is necessary to restrict the movement of the camshaft in the axial direction. A thrust plate that engages with the stepped portion of the camshaft is fixed to the cylinder head to restrict axial movement of the camshaft. On the other hand, it is necessary to close the end of the oil passage of the ROTSUKA armshaft. Conventionally, as in Utility Model Application Publication No. 49-23613, the end of the oil passage must be covered with a supporter that supports the ROTSUKA armshaft, or the end of the oil passage must be closed. A plug was fitted into the end opening of the passageway to close it off.

However, the structure for regulating the movement of the camshaft in the axial direction and the structure for blocking the oil passage of the rocker armshaft have conventionally been formed separately.
The positioning and assembly of these parts is also performed using separate parts, which is complicated and has low work efficiency.

In view of this, the present invention has been developed by screwing the bolt for attaching the thrust plate that restricts the axial movement of the camshaft to the end of the rocker arm shaft, and attaching the thrust plate to the end of the rocker arm shaft. The present invention provides an engine camshaft holding device in which the end of the oil passage of the rocker armshaft is closed with this bolt, thereby simplifying the structure and improving the ease of assembly.

Embodiments of the present invention will be described below with reference to the drawings. In the engine shown in FIGS. 1 to 3, 1 is a cylinder head, and 2 is a cylinder head 1.
3 is a camshaft installed on both sides of the upper part of camshaft 2 that rotates in synchronization with the engine rotation.
This is a rocker arm shaft fixed to the cylinder head 1 in parallel with the cylinder head.

The camshaft 2 has a bearing portion 2a at an end rotatably supported in a bearing hole 4a formed through a supporter 4 installed upright on the top of the cylinder head 1, and the rotation of the engine is controlled by a timing belt (not shown) or the like. It is configured to rotate in synchronization with the engine rotation.

The rocker arm shafts 3, 3 swingably support rocker arms 5 for intake or exhaust at predetermined intervals on their outer peripheries, and the rocker arm shafts 3, 3 support the rocker arms 5 for air intake or exhaust air at predetermined intervals on their outer peripheries.
It is attached and fixed to the upper part of the supporter 4 by fixing bolts 6, 6.

The rocker arm shaft 3 is hollow and has an oil passage 7 formed inside thereof, and the lubricating oil pumped from the lower cylinder head 1 is passed through the small hole 7.
a to the support part of the rocker arm 5, and the small hole 7
The lubricant is supplied from b to the sliding contact portion between the cam 2b and the rocker arm 5 to lubricate them. A female threaded portion 7c is formed at the end of the oil passage 7, that is, at the end opening of the rocker arm shaft 3 supported by the supporter 4.

Next, reference numeral 8 denotes a thrust plate that restricts the movement of the camshaft 2 in the axial direction. The lower end portion 8a (arc portion) of the camshaft 2 is configured to engage with a circumferential groove 2d formed between the bearing portion 2a and the flange portion 2c of the camshaft 2.

Further, the bolts 9, 9 for attaching the thrust plate 8 to the rocker arm shafts 3, 3 are connected to the female threaded portions 7c at the ends of the rocker arm shafts 3, 3.
By being screwed together, the end of the oil passage 7 is closed.

In addition, in FIG. 1, 10 is a bolt hole for inserting a head bolt, and in FIG. 2, 11 is a cooling water passage.

To explain the assembly of the above embodiment, the camshaft 2 is inserted into the bearing hole 4a of the supporter 4, and the bearing portion 2a is supported by the bearing hole 4a. Subsequently, the rocker arm shafts 3, 3 with the rocker arm 5 attached thereto are fixed to the upper part of the supporter 4 with the fixing bolts 6, 6, and then the lower end 8a of the thrust plate 8 is engaged with the circumferential groove 2d of the camshaft 2. The thrust plate 8 is attached to the end of the rocker arm shaft 3, 3 by screwing the bolts 9, 9 to the end of the rocker arm shaft 3, 3, and the camshaft is attached to the side of the supporter 4. 2
The bolts 9, 9 close off the ends of the oil passages 7, 7 of the rocker arm shafts 3, 3.

In addition, in the above assembly, the thrust plate 8 is attached to the rocker arm shaft 3, 3 with the bolts 9,
9, the two may be made into a unit, and then fixed to the supporter 4 with the fixing bolts 6. In this case, positioning can be performed more easily.

Therefore, according to the present invention as described above, the thrust plate is attached to the end of the rocker arm shaft with bolts, and the end of the oil passage of the rocker arm shaft is closed with the bolt, so that the oil passage is closed. This eliminates the need for a plug to close the end of the thrust plate, which can be done with the bolt that fixes the thrust plate, and has various practical advantages such as simplifying the structure, improving ease of assembly, and improving work efficiency. are doing.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view of the cylinder head with some parts omitted, Fig. 2 is a sectional side view of the main part, and Fig. 3 is a sectional front view of the main part at the end of the camshaft It is a diagram. 1...Cylinder head, 2...Camshaft,
3...Rotsuka armshaft, 4...Supporter,
7... Oil passage, 8... Thrust plate, 9
……bolt.

Claims (1)

[Scope of utility model registration request] A camshaft that is attached to the cylinder head of the engine and rotates in synchronization with the engine rotation, a hollow cutter arm shaft that is fixed to the cylinder head and has an oil passage formed therein, and a thrust that restricts the axial movement of the camshaft. The thrust plate is provided with a plate and a bolt for attaching the thrust plate, and the bolt is screwed to the end of the rocker arm shaft to attach the thrust plate to the end of the rocker arm shaft, and the bolt closes the end of the oil passage. An engine camshaft holding device characterized by: