JP3009834U - Valve seat processing tool - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the tool that processes the valve seat of the cylinder head part of the engine, improve the performance of the tool, facilitate manufacturing, and reduce cost. [Structure] A slide guide of a slider 3 provided on the main body 1 at an angle of 45 ° is composed of a fixed plate 15 and a movable plate 16, and a guide V provided on each plate.
The side surface of the slider 3 is taper-fitted into the groove 18. Also,
One side surface 16a of the movable plate 16 and the seat groove 1 in contact therewith
The groove surface of No. 7 is inclined by θ so that when the movable plate 16 is moved in the longitudinal direction by the adjusting screw 20, the plate 16 moves in the direction perpendicular to the longitudinal direction. As a result, the precision of the taper fitting portion can be adjusted, the dimension correction due to the actual situation that requires skill is not necessary, and the purpose of the above is achieved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improved tool for highly accurately cutting a valve seat attached to a cylinder head of an engine of an automobile or the like.

[0002]

[Prior art]

Fig. 5 shows a magnified view of the valve seat installed on the cylinder head of the engine. This valve seat A is sucked at the time of casting of the cylinder head B and is integrally embedded in the opening end of the exhaust port P, and then chamfered on each of the 30 ° surface f ₁ , 45 ° surface f ₂ and 70 ° surface f _3. Go and make it a finished product. The 45 ° surface f ₂ is a surface with which the intake and exhaust poppet valves are in contact, and high processing accuracy is required from the viewpoint of hermetic sealing. Therefore, a tool with good precision is required to machine this surface.

6 to 8 show a conventional tool used for machining the surface. In the figure, 1 is the main body, 2 is a guide groove which is provided at the tip of the main body at a 45 ° inclination, 3 is a slider inserted in the guide groove, 4 is a slidable axial direction in the central axial hole of the main body 1, and A slider drive shaft 5 which is engaged in a relatively non-rotatable manner, 5 is a power transmission pin fixed to the slider 3, 6 is a cutting tool for processing a 30 ° surface, and 7 is a cutting tool for processing a 70 ° surface. The cutting tools 6 and 7 use a cutting tool here.

At the tip of the slider 3, a cutting tool (round tool) 8 and a screw 9 for finely adjusting the position of the cutting edge of the cutting tool in the axial direction are provided. The pin 5 is slidably inserted into a pin hole 10 provided in the slider drive shaft 4 with its tip inclined in the opposite direction to the slider.

This tool moves forward while rotating and contacts the work, and firstly, the cutting tools 6 and 7 machine the 30 ° surface and the 70 ° surface. After that, the tool is slightly retracted, and the 45 ° surface is machined by the cutting tool 8. When the drive shaft 4 is gradually retracted while the main body 1 is rotated at a fixed position, the blade 8 is guided by the groove 2 so that the slider 3 moves diagonally rearward and outward, and therefore the blade tip is displaced obliquely by 45 °. In the meantime, the 45 ° surface is cut from the small diameter side toward the large diameter side.

After this work is completed, a reamer 11 (a blade is omitted in the figure) passing through the center of the main body is used to finish a hole in a guide bush (C in FIG. 1) which supports the poppet valve.

[0007]

[Problems to be solved by the device]

 The conventional valve seat processing tool described above employs the T-slot shown in FIG. 8 as the guide groove 2. However, in the structure shown in the figure in which the slider 3 having a T-shaped cross section is fitted in the T slot, strict dimensional accuracy, which is impossible by machining, is required for each fitting portion in order to prevent rattling of the slider.

[0008] Therefore, although the wrapping work according to the current situation is performed to individually correct the dimensions, the quality is not constant in this method. If the mating is loose, the slider will rattle and the machining stability will deteriorate (so-called chattering will occur in the tool), and high machining accuracy cannot be expected. Also, if the fitting is tight, the slider may not move smoothly and the pin 5 may break. Therefore, the work requires skillful techniques, and the productivity and the product price are adversely affected.

An object of the present invention is to eliminate the above-mentioned problems and to improve the performance of a valve seat processing tool, to facilitate the manufacture, and to reduce the cost.

[0010]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention improves a slide guide of a slider which is interlocked with a backward movement of a drive shaft and is moved diagonally backward by 45 °. Specifically, the slide guide is composed of a fixed plate and a movable plate that face each other with a slider in between. A guide portion is formed on these two plates so as to taper-fit to the side surface of the slider, and the outer side surface of the movable plate and the groove surface of the main body in contact with this surface are gentle with respect to the slider axis. A sloped surface is provided, and means for adjusting the longitudinal position of the movable plate is provided between the main body and the movable plate.

The cutting tools 7 and 8 and the reamer 11 described above are preferable in terms of efficiency in processing, but are not essential elements. It is also possible to perform machining of the 30 ° surface and 70 ° surface of the valve seat and hole finishing of the guide bush with another tool.

Further, the guide portion provided on the plate is preferably a V-shaped groove shown in an embodiment described later because it is easy to process, but an arc groove may be used. Further, if the slider has a dimensional allowance, these grooves may be provided on the side surface of the slider, and the guide portion on the plate side may be a ridge that fits and fits into it.

[0013]

[Action]

 When the movable plate is moved in the longitudinal direction, the distance between the movable plate and the fixed plate changes due to the gradient of one side surface, and the size of the gap between the movable plate and the taper fitting surface of the slider changes. Therefore, by adjusting the position of the movable plate, the gap between the fitting surfaces can be made zero to eliminate the rattling of the slide, and the sliding resistance of the slider can be corrected to an optimum value.

Further, since the fitting dimension, which was conventionally performed by the lapping work, can be corrected by the position adjustment of the movable plate, the lapping work requiring skill is not required.

In addition, although the conventional tool cannot correct the wear of the slider sliding surface, the tool of the present invention can absorb the wear amount by adjusting the position of the movable plate, so that the accuracy can be maintained for a long period of time. Is.

[0016]

【Example】

 1 to 4 show an example of a valve seat processing tool of the present invention.

In the figure, 1 is a tapered main body, 3 is a slider which is inclined by 45 ° and is provided on a conical surface at the tip of the main body, and 4 is an axially slidable but non-rotatable insertion member in a shaft hole at the rear of the main body. Combined slider drive shaft, 6 is a cutting tool for processing a 30 ° surface, 7 is a cutting tool for processing a 70 ° surface, 8 is a cutting tool for 45 ° surface processing attached to the slider tip, and 9 is a cutting edge position of cutting tool 8. 11 is a screw for finely adjusting the hole, and 11 is a reamer for finishing the hole of the guide bush C which is provided through the center of the body. Here, a throw-away tip is used as the cutting tools 6 and 7, and a round cutting tool is used as the cutting tool 8.

Reference numeral 12 in FIG. 1 is a power transmission guide bar provided in place of the pin 5 in FIG. The guide bar 12 is bolted to the drive shaft 4 and loosely engaged with a key groove 13 provided on the inner surface of the shaft hole of the main body 1, and also serves as a relative rotation preventing means for the main body 1 and the drive shaft 4. . The bent tip of the guide bar 12 is slidably inserted into a hole 14 provided in the slider 3, and therefore, the slider 3 moves when the drive shaft 4 moves forward and backward, and the above-mentioned 45 ° by the cutting tool 8 is moved. The surface can be processed.

The slide guide of the slider 3 is composed of a fixed plate 15 and a movable plate 16 shown in FIGS. These plates are housed in seat grooves 17 provided in the main body 1 and supported by the main body 1, and further, as shown in FIG. The groove 3 is fitted in the groove 18, and the slider 3 is guided in the groove 18.

The movable plate 16 has an insertion hole for the mounting bolt 19 (see FIGS. 2 and 4) as an elongated hole having a diameter larger than the bolt diameter so that the fixing position can be changed in the longitudinal direction and the longitudinal right-angle direction. . The outer side surface 16a of the movable plate 16 and the groove surface of the seat groove 17 in contact with the outer side surface 16a are surfaces having a slope of θ (preferably 5 ° or less) with respect to the slider axial center. The distance between the plate 16 and the fixed plate 15 also changes with the movement of the plate in the longitudinal direction.

Further, an adjusting screw 20 is screwed into the outer peripheral portion of the main body 1 in a direction parallel to the slider axis, and a part of the head of the screw 20 is inserted into a locking groove provided on the movable plate 16. It is inserted loosely.

In the machining tool configured as described above, when the bolt 19 is loosened and the adjusting screw 20 is tightened or loosened, the movable plate 16 engaged with the bolt 19 is lengthened along the groove surface of the seat groove 17. Direction, and at the same time a slight lateral displacement due to the gradient of θ changes the gap between the slider 3 and the tapered fitting surfaces of the plates 16 and 17. Therefore, the best fitting accuracy can be obtained without the correction of the working dimension, which achieves the object of the present invention.

[0023]

[Effect of device]

 As described above, the valve seat machining tool of the present invention improves the slide guide of the slider and enables the adjustment of the fitting accuracy of the mating part, so that the process of correcting the working dimension is not required. , Facilitating manufacturing and reducing costs.

Also, since the optimum sliding clearance and sliding resistance that the slider slides smoothly and is held stably can be secured, tool performance is improved and high machining accuracy is obtained, and the slider Problems such as damage to parts due to sliding failure are also reduced.

Furthermore, since the gap caused by the abrasion of the slider sliding surface can be eliminated by adjusting the position of the movable plate, it is possible to obtain the effect of maintaining high machining accuracy for a long period of time.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a valve seat processing tool of the present invention.

FIG. 2 is a view on arrow II in FIG.

FIG. 3 is a partially broken end view of the slide guide portion.

FIG. 4 is a perspective view of a plate that constitutes a slide guide.

FIG. 5 is a cross-sectional view of a valve seat to be processed.

FIG. 6 is a sectional view of a conventional tool

FIG. 7 is a front view of the same tool as above.

FIG. 8 is a sectional view showing a slide guide portion of a conventional tool.

[Explanation of symbols]

 1 Main Body 3 Slider 4 Slider Drive Shaft 6, 7, 8 Cutting Tool 9 Blade Edge Position Adjustment Screw 11 Reamer 12 Guide Bar 15 Fixed Plate 16 Movable Plate 17 Seat Groove 18 V-Groove for Guide 19 Fixing Bolt 20 Position Adjusting Screw of Movable Plate

Claims (1)

[Scope of utility model registration request] 1. A slider provided at the tip of a tapered main body at an angle of 45 °, a slide guide for this slider, a blade provided at the front end of the slider, and an axial slidable relative to a shaft hole at the rear of the main body. A non-rotatably inserted and engaged slider drive shaft, and a power transmission means for changing the forward / backward movement of the shaft and transmitting the same to the slider. The slider is interlocked with the drive shaft to move diagonally rearward outward.
In a valve seat processing tool that scrapes the poppet valve contact surface of the valve seat with the blade that moves integrally with the slider,
The slide guide is composed of a fixed plate and a movable plate that face each other with a slider in between, and a guide portion that is taper-fitted to the side surface of the slider is formed on these two plates. The groove surface of the main body that touches should be a surface with a gentle slope with respect to the slider axis,
A valve seat processing tool, characterized in that a movable plate longitudinal position adjusting means is provided between the main body and the movable plate.