CN203704848U

CN203704848U - Testing fixture for detecting timing angle of gear

Info

Publication number: CN203704848U
Application number: CN201420095480.XU
Authority: CN
Inventors: 何炳才; 钟建新
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2014-03-04
Filing date: 2014-03-04
Publication date: 2014-07-09
Anticipated expiration: 2024-03-04

Abstract

The utility model discloses a testing fixture for detecting time angle of a gear. The testing fixture comprises a workbench, an inner bore positioning round-pin, a keyway positioning round-pin and a detection round-pin, wherein the inner bore positioning round-pin and the keyway positioning round-pin are arranged on the workbench and are respectively used for fitting with an inner bore and a keyway of a gear to be detected; and the detection round-pin is disposed on the workbench overlapping the circumference of a reference circle of the gear to be detected. The diameter d of the detection round-pin satisfies the following condition: d=E-2r*sin theta, wherein r is radius of the reference circle of the gear to be detected; E is external diameter of the detection round-pin respectively tangent to corresponding gear sides; and theta is timing angle tolerance of the gear to be detected. The testing fixture can be used as a standard component, can be used to test whether timing angle of gears is qualified in batch, is simple to operate, and has high detection efficiency.

Description

The cubing of detection of gear timing angle

Technical field

The utility model relates to machine tool field, particularly a kind of cubing of detection of gear timing angle.

Background technology

Along with the continuous upgrading of engine draining technology, engine gear timing angle is had to higher accuracy requirement, the performance that affects engine is even damaged engine by the error of timing angle.As shown in Figure 1, engine gear timing angle refers to the angle (being labeled as α in Fig. 1) of the center line between gear keyway center line and two flank profils of gear face, correspondingly, on this flank profil end face, marks respective token.

At present, great majority adopt universal tool-measuring microscope or large tool microscope to detect engine gear timing angle, but, adopt and detect in this way inconvenience, time-consuming, can only be used for sampling observation, can not be on production line mass detection, and this detection method exists inevitable theoretical error.Simultaneously, in the time of machining, need carry out chamfered edge and gear two ends cylindricals (on point circle) chamfering on the involute urve of tooth top tip relief, flank profil to gear by product drawing designing requirement, make two measuring basiss on the tooth top of geared end become space imaginary point, checker need to increase straight pin in the time that reality detects between two flank profils, do relative measurement, easily cause measuring error.

Utility model content

The utility model is in order to overcome defect in above-mentioned prior art, and a kind of cubing of detection of gear timing angle is provided, can on-line quick detection gear timing angle, reduce production costs, and enhance productivity.

For achieving the above object, the utility model provides a kind of cubing of detection of gear timing angle, comprising: worktable; Internal hole positioning round pin and keyway location round pin, it is located on worktable and is used for respectively mating with endoporus and the keyway of gear to be detected; Detect round pin, it is located on worktable the position overlapping with the circumference of the reference circle of gear to be detected, its diameter d=E-2r*sin θ, wherein, r is the calibration radius of a circle of gear to be detected, E detects round pin and corresponding flank to distinguish the external diameter when tangent, and θ is gear timing angle tolerance to be detected.

Compared with prior art, the utlity model has following beneficial effect: the external diameter that detects round pin by the timing angle margin tolerance design of concrete gear, whether whether detect the corresponding teeth groove of round pin and gear to be detected by judgement interfere to check the timing angle of gear qualified, this cubing can be used as a kind of standard component, whether qualifiedly can realize batch detection gear timing angle, simple to operate, detection efficiency is high.

Accompanying drawing explanation

Fig. 1 is the timing angle mark schematic diagram of gear to be detected in the present embodiment;

Fig. 2 is the principle schematic of the cubing of detection of gear timing angle of the present utility model.

Embodiment

Below in conjunction with accompanying drawing, an embodiment of the present utility model is described in detail, but is to be understood that protection domain of the present utility model is not subject to the restriction of embodiment.

As shown in Figure 2, the cubing of detection of gear timing angle of the present utility model comprises worktable 1 and establishes three round pins (pin hole that three round pins are installed is only shown in figure) thereon, the present embodiment is illustrated as an example of pin hole that three round pins are installed example, particularly, comprise Internal hole positioning round pin, keyway location round pin and detection round pin (unmarked in figure), correspondingly, Internal hole positioning round pin is arranged on the first pin hole 13, keyway location round pin is arranged on the second pin hole 11, detect round pin and be arranged on the 3rd pin hole 12, the first pin hole 13 is mated with endoporus and the keyway of gear to be detected respectively with the second pin hole 11, its design parameter according to processing gear to be detected is processed, Internal hole positioning round pin is consistent with the diameter of bore of gear to be detected, the keyway location external diameter of round pin and the width of keyway of gear to be detected are consistent, endoporus and keyway that Internal hole positioning round pin and keyway location round pin are treated respectively detection of gear position.

Especially, describe detecting the installation site of round pin on worktable as an example of the 3rd pin-and-hole 12 of installation and measuring round pin example, first, be round D take the first pin hole 13 center as the center of circle and take the length of the radius r of the reference circle of gear to be detected as radius at the upper surface of worktable 1, the center of circle of the 3rd pin-and-hole 12 is on the circumference of circle D, secondly, the particular location of the 3rd pin-and-hole 12 on the circumference of circle D determined according to timing angle mark flank profil on gear face to be detected.In addition, detect the theoretical diameter d=E-2r*sin θ of round pin, wherein, r is the calibration radius of a circle of gear to be detected, the external diameter of E when to be described detection round pin tangent respectively with corresponding flank, θ is gear timing angle tolerance to be detected, can determine that the minimum diameter value of detection round pin is d according to the maximum magnitude value of gear timing angle tolerance to be detected _min, when the diameter that detects round pin is d _mintime, gear to be detected is placed on worktable 1 and detects round pin and can fall in the corresponding teeth groove of gear to be detected, and it is qualified that gear timing angle to be detected is.

Below for the detection principle of this cubing describes:

1. the reference radius of the detected gear of hypothesis is r, on the circumference of reference circle with flank respectively tangent diameter of a circle be E, be the maximum outside diameter that detects round pin;

2. as the gear anglec of rotation θ (θ=this gear timing angle tolerance) that turns left or turn right, its chord length on the circumference of reference circle is changed to L, sin θ=L/r, L=r*sin θ;

3. be designed to minimum value, i.e. d if detect the external diameter of round pin _min=E-2r*sin θ _max, gear to be detected can be placed in three round pins on worktable, illustrates that the rotation of gear changes between its timing angle technical requirement tolerance.

The cubing of making by above-mentioned principle can be used as a kind of standard component, can realize batch detection gear timing angle whether qualified, simple to operate, and detection efficiency is high.

Disclosed is above only specific embodiment of the utility model, and still, the utility model is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection domain of the present utility model.

Claims

1. a cubing for detection of gear timing angle, is characterized in that, comprising:

Worktable;

Internal hole positioning round pin and keyway location round pin, it is located on described worktable and is used for respectively mating with endoporus and the keyway of gear to be detected;

Detect round pin, it is located on described worktable the position overlapping with the circumference of the reference circle of gear to be detected, its diameter d=E-2r*sin θ, wherein, r is the calibration radius of a circle of gear to be detected, the external diameter of E when to be described detection round pin tangent respectively with corresponding flank, θ is gear timing angle tolerance to be detected.