Tool for measuring effective length of external spline

Abstract

The utility model provides a tool for measuring the effective length of an external spline. The tool comprises a centering ring, a measuring head screw and a measuring rod, the centering ring is coaxially sleeved on the detected external spline, the side wall of the centering ring body is provided with a threaded hole, and the center of the threaded hole is vertical to the center of the detected external spline; a measuring head screw rod is screwed into the threaded hole, and a tip measuring head at the inner side of the measuring head screw rod is propped against the bottom of the groove of the external spline to be measured; the displacement centering ring is axially pulled down until the centering ring cannot move, a locking measuring head screw rod is tightened to enable a tip measuring head of the locking measuring head screw rod to abut against the root circle position of the bottom of the groove of the external spline to be measured, and the measuring tool is locked; the centering ring body is vertically and fixedly provided with the measuring rod, and the initial zero position of the bottom end of the measuring rod is horizontally aligned with the lower end face of the measuring head of the measuring head screw; the scale position of the top shaft end face of the measured external spline aligned with the measuring rod is the effective length of the measured external spline. The device can accurately and reliably measure the effective length of the external spline, and is simple in structure, simple and convenient to operate and suitable for popularization.

Description

TECHNICAL FIELD

[0001] The utility model belongs to physical measurement, measuring tool technical field for physical measurement, specifically relates to a kind of outer spline effective length measuring tool. BACKGROUND

[0002] As a kind of widely used mechanical connection structure, spline is used to transmit torque and motion, and its precision and quality have a crucial influence on the performance and reliability of the entire mechanical system. As a common type of spline, the effective length of the outer spline is one of the key parameters for measuring quality. With the rapid development of manufacturing industry, the precision and production efficiency of mechanical products are increasingly required. Especially in the precision machining industry of aerospace, automobile manufacturing and other industries, the quality and precision of the outer spline have reached an unprecedented height. Measurement is also an important part of the production process. Currently, when measuring the effective length of the outer spline, the main method is "observation cutter method", that is, observing the position of the spline root cut by the hob, and then measuring. However, this method is limited by the experience and skill level of the operator, and the results obtained by different personnel are quite different, and consistency and reliability are difficult to guarantee. Therefore, the following improved technical scheme is proposed. SUMMARY

[0003] The utility model solves the technical problems of providing a kind of outer spline effective length measuring tool, and solving the technical problems of inconvenient measurement of outer spline effective length.

[0004] The utility model discloses the technical scheme: a kind of outer spline effective length measuring tool, including centering ring, measuring head screw rod and measuring rod;Centering ring coaxially covers the outer spline to be measured, and the side wall of the ring body of centering ring is provided with threaded hole, and the center of threaded hole is perpendicular to the axis of the outer spline to be measured;Threaded hole is screwed into measuring head screw rod, and the inside tip of measuring head screw rod is on the groove bottom of the outer spline to be measured;Axially pull down displacement centering ring until centering ring cannot be displaced, tighten measuring head screw rod to make its tip measuring head tightly pack the tooth root circle position of groove bottom of the outer spline to be measured, so as to lock the measuring tool;The ring body of centering ring is vertically fixed and installed measuring rod, and the initial zero position of the bottom end of measuring rod is horizontally aligned with the lower end surface of measuring head of measuring head screw rod;The effective length of the outer spline to be measured is that the scale position of the top end axis end surface of the outer spline to be measured is aligned with the scale position of the measuring rod.

[0005] In the above technical scheme, further: it further includes lock nut, lock nut is installed on the outside end of measuring head screw rod, and the inner end surface of lock nut is tightly packed with the outer end surface of the ring body of centering ring for locking the position of measuring head screw rod.

[0006] In the above technical scheme, further: the position of the ring body of centering ring, where measuring head screw rod is installed, is provided with a horizontal section.

[0007] In the above technical solution, preferably, the measuring head screw rod has a pointed head at one end and a threaded part at the other end, the pointed head is an inner side pointed end head of the measuring head screw rod, the threaded part is screwed into a threaded hole of the centering ring, the threaded part has a plurality of square counterbores on an axial end face, and an outer side end of the threaded part extends out of the threaded hole.

[0008] In the above technical solution, further, when the measuring head screw rod is two, the measuring head screw rods are arranged in axial symmetry on the centering ring body and used for measuring the measured external spline with an even number of grooves.

[0009] In the above technical solution, further, when the measuring head screw rod is three, the measuring head screw rods are arranged in central symmetry on the centering ring body and used for measuring the measured external spline with an odd number of grooves.

[0010] Compared with the prior art, the utility model has the advantages of:

[0011] 1. The utility model discloses a solution to the problem of large deviation of detection results of different persons, and can accurately, reliably and stably measure the effective length of the external spline, has simple structure and is easy to operate, and is suitable for promotion.

[0012] 2. The utility model discloses that the centering ring is clamped at the tooth root circle position of the measured external spline by the measuring head screw rod, and the scale position of the alignment rod at the top end of the measured external spline is read to obtain the effective length of the measured external spline. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a longitudinal section schematic view during measurement of the utility model;

[0014] Figure 2 It is a perspective view during measurement of the utility model;

[0015] Figure 3 It is a transverse section schematic view during measurement of the utility model;

[0016] Figure 4 It is an enlarged assembly view of the measuring head screw rod and the lock nut of the utility model;

[0017] In the drawing, 1 is a measured external spline, 2 is a centering ring, 201 is a threaded hole, 202 is a horizontal section, 3 is a measuring head screw rod, 301 is a pointed head, 302 is a threaded part, 303 is a plurality of square counterbores, 4 is a lock nut, and 5 is a measuring rod. DETAILED DESCRIPTION

[0018] The utility model will be described below in combination with the drawings of the embodiments of the utility model. Figures 1-4The technical solutions of the embodiments of the utility model are clearly and completely described, obviously, the described embodiments are only some of the embodiments of the utility model, not all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the scope of the utility model protection.

[0019] (As Figure 1 , Figure 2 , Figure 3 An outer spline effective length measuring tool (as shown in the figure) comprises a centering ring 2, a measuring head screw rod 3 and a measuring rod 5. The centering ring 2 is coaxially sleeved on the measured outer spline 1. Threaded holes 201 are formed in the side wall of the ring body of the centering ring 2, and the center of the threaded holes 201 is perpendicular to the axis of the measured outer spline 1. The threaded holes 201 are screwed into the measuring head screw rod 3, and the inner side tip of the measuring head screw rod 3 is on the groove bottom of the measured outer spline 1. The centering ring 2 is axially pulled down until it cannot be displaced, and the measuring head screw rod 3 is tightened to lock the tip of the measuring head on the tooth root circle position of the groove bottom of the measured outer spline 1, so as to lock the measuring tool. The ring body of the centering ring 2 is vertically fixedly installed with the measuring rod 5. It should be understood that the rod body of the measuring rod 5 is provided with a scale, and the starting zero position of the bottom end of the measuring rod 5 is horizontally aligned with the lower end surface of the measuring head of the measuring head screw rod 3. The top end axial end surface of the measured outer spline 1 is aligned with the scale position of the measuring rod 5, which is the effective length of the measured outer spline 1.

[0020] The bottom end starting zero position of the measuring rod 5 is horizontally aligned with the lower end surface of the measuring head of the measuring head screw rod 3 (in combination with Figure 1 The top end axial end surface of the measured outer spline 1 is aligned with the scale position of the measuring rod 5, which is the effective length of the measured outer spline (in combination with Figure 2 This design makes the reading intuitive and accurate, and facilitates quick acquisition of measurement results. Since the centering ring 2 and the measuring head screw rod 3 have a certain universality, the measuring tool can be applied to the measurement of outer splines of different specifications and sizes. When used, only different specifications of the centering ring 2 and the measuring head screw rod 3 need to be replaced.

[0021] In the above embodiment, further comprising a lock nut 4, the lock nut 4 is rotatably installed on the outer side end of the measuring head screw rod 3, and the inner end surface of the lock nut 4 abuts against the outer end surface of the ring body of the centering ring 2 to lock the position of the measuring head screw rod 3.

[0022] The anti-loose nut 4 is rotatably installed on the outer end of the measuring head screw 3, and the inner end face of the anti-loose nut 4 abuts against the outer end face of the ring body of the centering ring 2, so as to further effectively lock the position of the measuring head screw 3. This design ensures that the measuring head screw 3 will not loosen or displace due to vibration or external force during the measurement process, thereby ensuring the accuracy and stability of the measurement. Due to the presence of the anti-loose nut 4, the position of the measuring head screw 3 is further reliably fixed, which helps to reduce the measurement error caused by the loosening of the measuring head screw 3, thereby improving the accuracy and reliability of the measurement. During long-term use, if the measuring head screw 3 or the centering ring 2 is worn or damaged, the operator can conveniently loosen the anti-loose nut 4 to replace or repair the parts.

[0023] In the above embodiment, further: the position where the ring body of the centering ring 2 installs the measuring head screw 3 is provided with a horizontal section 202. The horizontal section 202 provides an accurate reference plane, not only making it easier to center the measuring head screw 3 during installation, but also increasing the contact area between the anti-loose nut 4 and the centering ring 2, thereby improving the stability of the structure and helping to prevent loosening or displacement due to vibration or external force during the measurement process.

[0024] In the above embodiment, preferably: (as shown) Figure 4 The measuring head screw 3 is provided with a sharp head 301 at one end and a threaded portion 302 at the other end. The sharp head 301 is the inner side sharp end head of the measuring head screw 3. The threaded portion 302 is screwed into the threaded hole 201 of the centering ring 2. The threaded portion 302 is provided with a multi-sided counterbore 303 at the axial end face, and the outer end of the threaded portion 302 protrudes out of the threaded hole 201.

[0025] The sharp head 301 as the inner side sharp end head of the measuring head screw 3 can achieve accurate abutting measurement of small size or complex shape workpieces, and performs well when deep into the interior of the workpiece or measuring narrow space. The threaded portion 302 is screwed into the threaded hole 201 of the centering ring 2, and the threaded connection makes the installation and removal of the measuring head screw 3 simple and fast, and the operator can easily screw the measuring head screw 3 into or out of the threaded hole 201 for replacement or maintenance. The multi-sided counterbore 303 can be used to install the measuring head screw 3 with the help of installation tools. The outer end of the threaded portion 302 protrudes out of the threaded hole 201, which facilitates the installation of the anti-loose nut 4 and further ensures the locking effect.

[0026] In the above embodiment, further: when the measuring head screw 3 is two, the measuring head screws 3 are arranged in axial symmetry on the ring body of the centering ring 2 and are used to measure the measured external spline 1 with an even number of grooves.

[0027] The two measuring head screws 3 are arranged in axial symmetry, the centering effect is excellent, and the accuracy and reliability of measurement are improved.

[0028] In the above embodiment, further: when the measuring head screw 3 is three, the measuring head screw 3 is arranged in central symmetry on the ring body of the centering ring 2 and is used for measuring the measured external spline 1 with an odd number of grooves.

[0029] Similarly, for the measured external spline 1 with an odd number of grooves, the three measuring head screws 3 can correspond to three different groove positions of the measured external spline 1 with an odd number of grooves, respectively, the centering effect is excellent, and the comprehensiveness and accuracy of measurement are ensured.

[0030] The working principle of the utility model is: the principle that the circular arc generated when the cutter cuts the spline groove of the measured external spline 1 causes the diameter to increase, and the tooth root circle arc point position of the measured external spline 1 is the effective length end position of the measured external spline 1. First, the centering ring 2 is sleeved on the tooth root circle of the measured external spline 1, and the tooth root circle is used for centering. When centering, according to the processing mode of the spline, the position of the tooth root circle is the effective length position, and the diameter of the tooth root circle below the position of the tooth root circle gradually increases until the diameter of the spline reaches the maximum diameter. Therefore, when the measured external spline 1 is measured, the inner side tip of the measuring head screw 3 is on the groove bottom of the measured external spline 1, the axial displacement centering ring 2 is pulled down until the centering ring 2 cannot continue to be pulled down, that is, the measuring head screw 3 reaches the tooth root circle position of the measured external spline 1, then the locking measuring head screw 3 is locked to make the tip of the measuring head screw 3 tightly contact the groove bottom of the measured external spline 1, so that the measuring tool is locked. Since the initial zero position of the measuring rod 5 bottom end is horizontally aligned with the lower end surface of the measuring head screw 3, the top end surface of the measured external spline 1 is aligned with the scale position of the measuring rod 5, that is, the effective length of the measured external spline 1, and the effective length value of the measured external spline 1 can be directly and quickly read from the reading of the measuring rod 5.

[0031] It can be found from the above description that the utility model solves the problem of large deviation of detection results of different persons, can accurately, reliably and intuitively measure the effective length of the external spline, has simple structure, convenient operation and is suitable for promotion.

[0032] Each embodiment in the specification is described in a related manner, and the same and similar parts between each embodiment can be referred to each other, and each embodiment mainly explains the difference from other embodiments.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications and equivalent substitutions made within the spirit and principles of the present utility model are included within the scope of protection of the present utility model.

Claims

1. A tool for measuring the effective length of an external spline, characterized in that: The device includes a centering ring (2), a probe screw (3), and a measuring rod (5); the centering ring (2) is coaxially fitted onto the external spline (1) being measured, and the side wall of the centering ring (2) has a threaded hole (201), the center of which is perpendicular to the axis of the external spline (1) being measured; the threaded hole (201) is screwed into the probe screw (3), and the inner tip of the probe screw (3) is placed against the bottom of the groove of the external spline (1) being measured; the centering ring (2) is pulled down axially to displace the probe screw (2). Tighten the locking probe screw (3) until the centering ring (2) can no longer move, so that the tip of the probe is pressed against the bottom tooth root circle of the groove of the external spline (1) to lock the measuring tool; the centering ring (2) is vertically fixed to the measuring rod (5), and the bottom zero position of the measuring rod (5) is horizontally aligned with the lower end face of the probe screw (3); the effective length of the external spline (1) is when the top shaft end face of the external spline (1) is aligned with the scale position of the measuring rod (5).

2. The external spline effective length measuring tool according to claim 1, characterized in that: It also includes a locking nut (4), which is rotatably installed on the outer end of the probe screw (3), and the inner end face of the locking nut (4) abuts against the outer end face of the centering ring (2) to lock the position of the probe screw (3).

3. The external spline effective length measuring tool according to claim 1 or 2, characterized in that: The centering ring (2) has a horizontal cut surface (202) at the position where the probe screw (3) is installed.

4. The external spline effective length measuring tool according to claim 3, characterized in that: The probe screw (3) has a pointed head (301) at one end and a threaded part (302) at the other end. The pointed head (301) is the inner tip of the probe screw (3). The threaded part (302) is screwed into the threaded hole (201) of the centering ring (2). The end face of the threaded part (302) has a plurality of square countersunk holes (303), and the outer end of the threaded part (302) extends out of the threaded hole (201).

5. The external spline effective length measuring tool according to claim 4, characterized in that: When there are two probe screws (3), the probe screws (3) are axially symmetrically arranged on the centering ring (2) and used to measure the external spline (1) with an even number of grooves.

6. The external spline effective length measuring tool according to claim 4, characterized in that: When there are three probe screws (3), the probe screws (3) are symmetrically arranged on the centering ring (2) and used to measure the external spline (1) with an odd number of grooves.

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