Pit-digging-free cam type door closer piston

Abstract

The utility model discloses a pit-digging-free cam type door closer piston which comprises a cylindrical body, and an avoiding groove is formed in the middle section of the cylindrical body. The middle section of the receding groove is provided with an oval hole position used for installing a cam shaft. A square concave hole for mounting a bearing is formed in the bottom of the cylindrical body, and the square concave hole is communicated with the avoiding groove; a bearing pin hole for fixing a bearing is formed in the surface of the cylindrical body, and the bearing pin hole is communicated with the square concave hole; a round hole used for installing a one-way valve is formed in the top of the receding groove, and an arc-shaped buffering boss used for buffering the cam shaft is integrally formed on one side of the edge of the receding groove in a cold extrusion mode. The die blank is reasonable in structural arrangement, the buffering boss is located on one side of the edge of the receding groove and is integrally formed through cold extrusion, the die blank obtained through cold extrusion is better in material compactness and more stable in size and is not formed through machining, and therefore machining efficiency can be improved, complexity of the machining technology is greatly reduced, and applicability is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of door closer, specifically relates to a kind of cam type door closer piston of pit-free. BACKGROUND

[0002] Door closer is a kind of common structure that realizes door closing operation by the cooperation of gear and the catch on piston, when using, door rotation drives the rotation of the rotating shaft of door closer, the rotating shaft drives the rotation of gear, thereby moving piston by the action of gear, by the action of piston and spring in door closer, realize the control and adjustment of opening and closing speed, for example, CN202120580610.9 patent name is: a kind of door closer piston, including body, the top of body is equipped with opening, U-shaped groove is equipped on body, U-shaped groove is located at the side of opening, the bottom of body is equipped with through hole, through hole is communicated with opening, the both ends of body are equipped with first oil port and second oil port respectively.

[0003] Although it can meet the general use demand, but it is not conducive to machining operation due to the limitation of structure, it needs to machine the two sides of piston, it is more time-consuming and laborious, greatly reduces the processing efficiency, so that the applicability is limited. SUMMARY

[0004] The utility model aims at providing a kind of pit-free cam type door closer piston with reasonable structure and convenient processing.

[0005] The technical scheme for realizing the utility model is a kind of pit-free cam type door closer piston, including cylindrical body, the middle section of cylindrical body is provided with position-avoiding recess groove;

[0006] The middle section of position-avoiding recess groove is provided with oval hole position for installing camshaft, and the end of oval hole position extends into position-avoiding recess groove;

[0007] The bottom of cylindrical body is provided with square recess hole for installing bearing, and the square recess hole is communicated with position-avoiding recess groove;

[0008] The surface of cylindrical body is provided with bearing pin hole for fixing bearing, and the bearing pin hole is communicated with the square recess hole;

[0009] The edge of position-avoiding recess groove is integrally formed with arc-shaped buffer boss for buffering camshaft by cold extrusion.

[0010] Further preferably, the major axis of the oval hole position is the same as the axial direction of the cylindrical body, and the top of the arc-shaped buffer boss is higher than the plane where the oval hole position is located.

[0011] Further preferably, a top of the cylindrical body is provided with a one-way valve hole for mounting a one-way valve.

[0012] A top end of the one-way valve hole extends into a bottom wall of the position-avoiding groove and is between the arc-shaped buffer boss and an inner wall of the position-avoiding groove.

[0013] Further preferably, the cylindrical body is a metal structure.

[0014] Further preferably, a middle line of the arc-shaped buffer boss coincides with a long diameter of the elliptical hole.

[0015] The utility model has the positive effect: the utility model discloses the structure is reasonably arranged, and the buffer boss is at the edge of the position-avoiding groove one side and is cold extrusion integrated, and the die blank materiality of cold extrusion is better, and the size is also more stable, and is not machined, thereby being favorable for improving the processing efficiency, greatly reducing the complexity of processing technology, and being strong in applicability. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to make the content of the utility model more easily be clearly understood, the following according to specific embodiment and combining with the drawings, the utility model is further detailed, wherein:

[0017] Figure 1 It is the structure schematic diagram of the utility model;

[0018] Figure 2 It is the side view structure schematic diagram of the utility model;

[0019] Figure 3 It is the top surface structure schematic diagram of the utility model;

[0020] Figure 4 It is the bottom surface structure schematic diagram of the utility model.

[0021] Reference signs: cylindrical body 1, position-avoiding groove 2, elliptical hole 3, square recess 4, bearing pin hole 5, arc-shaped buffer boss 6, one-way valve hole 7. DETAILED DESCRIPTION

[0022] The technical scheme in the utility model embodiment will be described clearly and completely below in combination with the drawings in the utility model embodiment, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model. EMBODIMENT

[0023] See Figures 1 to 4As shown in the figure, a kind of pit-free cam door closer piston, including cylindrical body 1, the middle section of the cylindrical body is provided with a position avoidance groove 2;In the embodiment, the cylindrical body is a metal structure, the depth of the position avoidance groove can be machined according to need, and the structure in the background art is the same, so it is not described in detail.

[0024] At the same time, in the embodiment, the top and bottom are only for convenient description, and are not limited thereto, and the specific Figure 1 The direction shown is the reference direction, the middle section of the position avoidance groove is provided with an oval hole 3 for installing camshaft, the bottom of the cylindrical body is provided with a square recess 4 for installing bearing, and the square recess is communicated with the position avoidance groove;In the embodiment, the square recess can be a rectangular hole or a square hole, and in the embodiment, it is a rectangular hole;

[0025] The surface of the cylindrical body is provided with a bearing pin hole 5 for fixing bearing, and the bearing pin hole is communicated with the square recess;The edge of the position avoidance groove is integrally formed with an arc-shaped buffer boss 6 for buffering camshaft by cold extrusion. The middle line of the arc-shaped buffer boss coincides with the long diameter of the oval hole. In the embodiment, the buffer boss is at the side edge of the position avoidance groove, and is integrally formed by cold extrusion, so as to improve the processing efficiency and reduce the machining difficulty.

[0026] Moreover, in the embodiment, the long diameter of the oval hole is the same as the axial direction of the cylindrical body, and the top of the arc-shaped buffer boss is higher than the plane where the oval hole is located.

[0027] And, in the embodiment, the top of the cylindrical body is provided with a one-way valve hole 7 for installing one-way valve;The one-way valve hole is communicated with the position avoidance groove.

[0028] The utility model has the positive effect: the structure of the utility model is reasonable, the buffer boss is at the side edge of the position avoidance groove and is integrally formed by cold extrusion, the material of the die blank extruded by cold extrusion is more dense, and the size is more stable, and it is not machined, so as to improve the processing efficiency, greatly reduce the complexity of processing technology, and have strong applicability.

[0029] The standard parts used in the embodiment can be directly purchased from the market, and the non-standard structure parts according to the description can also be directly machined according to the existing technical knowledge without doubt, and the connection mode of each part adopts the mature conventional means in the existing technology, and the machinery, parts and equipment adopt the conventional type in the existing technology, so the specific description is not made here.

[0030] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation manners of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to enumerate all the implementation manners. The obvious changes or variations extended from the essential spirit of the present application still belong to the protection scope of the present application.

Claims

1. A pit-free cammed door closer piston comprising a cylindrical body, characterised in that: The middle section of the cylindrical body is provided with a clearance groove; The middle section of the clearance groove is provided with an oval hole for mounting a camshaft, the end of the oval hole extending into the clearance groove; The bottom of the cylindrical body is provided with a square recess for mounting a bearing, the square recess being in communication with the clearance groove; The surface of the cylindrical body is provided with a bearing pin hole for fixing the bearing, the bearing pin hole being in communication with the square recess; The edge of the clearance groove is integrally formed with an arc-shaped buffer boss for buffering the camshaft by cold extrusion.

2. A pit-free cammed door closer piston according to claim 1, characterized in that: The long diameter of the oval hole is the same as the axial direction of the cylindrical body, and the top of the arc-shaped buffer boss is higher than the plane where the oval hole is located.

3. A pit-free cammed door closer piston according to claim 2, characterised in that: The top of the cylindrical body is provided with a one-way valve hole for mounting a one-way valve; The top end of the one-way valve hole extends into the bottom wall of the clearance groove and is between the arc-shaped buffer boss and the inner wall of the clearance groove.

4. A pit-free cammed door closer piston according to claim 1, characterized in that: The cylindrical body is a metal structure.

5. A dig-free cammed door closer piston according to claim 1, wherein: The middle line of the arc-shaped buffer boss coincides with the long diameter of the oval hole.

Images