CN204165479U - Deep hole diameter run-out cubing in axle - Google Patents

Abstract

The utility model discloses a deep hole radial runout inspection tool in a shaft, which comprises a base, a fixed support, a shaft sleeve, a measuring rod, a mandrel and a movable support. The mandrel is inserted into the inner hole of the workpiece, one end of the mandrel is supported by a fixed center point, and the other end is supported by an inner center point, and the two ends of the workpiece to be tested are coaxially supported by a fixed support and a movable support respectively. A measuring rod with clearance fit is installed in the built-in axial blind hole of the mandrel, and one end of the measuring rod is in contact with a probe with clearance fit in the radial hole of the mandrel. The measuring head is composed of a spring and a screw and radially elastically extends out to measure the structure. During the relative rotation of the measuring head that contacts the inner hole wall of the workpiece, it will produce a corresponding radial displacement with the actual measurement results. The ejector rod moved by the measuring rod drives the head of the dial indicator to deflect the pointer, and the value shows the radial runout value of the inner hole of the target section of the measured workpiece. In the utility model, the two ends of the workpiece and the mandrel are coaxially supported together, and this structure realizes the coincidence of the positioning reference and the design reference, avoids the error of the detection reference, and is beneficial to improve the detection accuracy.

Description

Radial runout inspection tool for deep hole in shaft

technical field

The utility model relates to a checking tool for measuring the processing quality of the inner hole of a mechanical part, in particular, the utility model relates to a checking tool for measuring the radial runout of the inner hole of a hollow shaft.

Background technique

The hollow shaft is a common mechanical part, and the design basis and measurement basis of this type of parts are the central axis according to the convention. Under the condition of existing technical equipment, by coaxially supporting the inner holes at both ends of the hollow shaft, it is possible to accurately measure the length and radial runout of each part of the outer wall of the hollow shaft. In reality, many devices are equipped with hollow shaft inner hole positioning and installation kits, so this type of shaft hole has both dimensional tolerance requirements and positional accuracy requirements. Since the inner holes at both ends of this type of parts are blocked by supports when testing such parts, general-purpose measuring tools cannot Directly measure the radial runout of the inner hole, so it is difficult to effectively control the quality during the manufacturing process, especially for hollow shafts with inner hole diameters less than 35mm, it is even more difficult to achieve online detection position accuracy. For example, the inner hole of the drive shaft in a car transmission is only Φ23mm, and the multi-section shaft gears in the inner hole have radial runout restrictions. Due to the lack of universal measuring tools for on-line inspection at the production site, its manufacturing quality is difficult to control. It is easy to cause batch out-of-tolerance accidents.

Utility model content

The utility model mainly aims at the current situation that the radial runout detection of the inner hole of the hollow shaft lacks an online inspection tool, and proposes a inspection tool suitable for measuring the radial runout of the deep hole in the shaft at the production site. The inspection tool has simple structure, convenient detection and accurate measurement.

The utility model realizes the technical goal through the following technical solutions.

The deep hole radial runout inspection tool in the shaft includes a base, a fixed support, a shaft sleeve, a measuring rod, a mandrel and a movable support. The base is a rectangular plate, one end in the length direction of the plate is fixedly connected to a fixed support, and the other end plate is evenly distributed with three longitudinal and parallel upward opening grooves, the groove in the middle is a rectangular groove, and the T The groove is used for locking the movable support. The movable support is an angular component, and the bottom plate is provided with a key protruding downward, and the key cooperates with the rectangular groove of the base to form a movable support straight track structure. The top assembly of the movable support is an axially adjustable structure composed of a coaxial movable center, an inner center, a shaft sleeve and a locking screw. The top of the fixed support is equipped with a dial gauge installed coaxially with the fixed top as the carrier, a compression spring, and a push rod to form an axial measurement structure. The two ends of the workpiece are coaxially supported by the fixed support and the movable support respectively. The improvement is that the mandrel is a multi-section straight rod shaft with built-in axial blind holes, and one end of the mandrel inserted into the inner hole of the workpiece is supported by a fixed center. One end of the mandrel facing the movable support is a solid shaft section, and the center hole provided on the end surface of the shaft section is supported by the inner top. A loose-fit measuring rod is installed in the built-in axial blind hole of the mandrel. The two ends of the slender measuring rod are provided with tips. Contact, the probe is composed of a spring and a screw, and the radial elastic extension measurement structure, the probe that contacts the inner hole wall of the workpiece, in the process of relative rotation, produces a corresponding radial displacement with the actual measurement results, and the radial displacement drives the thrust rod axially Displacement, the ejector rod that moves with the measuring rod drives the head of the dial gauge to make the pointer shift, and the value shows the radial runout value of the inner hole of the target section of the measured workpiece.

In the above structure, the contact between the measuring head and the measuring rod is a cone shaft section, and its cone angle is 90 ⁰ . The apexes at both ends of the measuring rod are cones with a cone angle of 60 ⁰ .

Compared with the prior art, the utility model has the following positive effects:

1. The built-in measurement structure is simple, easy to manufacture and easy to operate;

2. Both ends of the workpiece and the mandrel are coaxially supported. This structure achieves the same positioning reference as the design reference, ensuring accurate positioning, convenient loading and unloading, and no special requirements for testing conditions. It is especially suitable for the inner diameter of the shaft at the production site. detection of jumping;

3. Quantitative measurement results are intuitive, with high measurement accuracy and high efficiency.

Description of drawings

Fig. 1 is the structural representation of the utility model.

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a schematic cross-sectional view at A-A of Fig. 1 .

Fig. 4 is an enlarged schematic diagram of the local structure at B in Fig. 1, showing the radial elastic extension measurement structure.

Detailed ways

Below according to accompanying drawing and in conjunction with embodiment, the utility model is further described.

The embodiment of the deep hole radial runout tester shown in Figure 1 is used to measure the radial runout of the transmission shaft inner hole of a high-end car transmission. The tester includes a base 1, a fixed support 2, a shaft sleeve 3, and a measuring rod 4 , mandrel 5 and movable support 6. The base 1 is a basic component. In this embodiment, the base 1 is a rectangular plate, one end of the plate surface is fixedly connected to the fixed support 2, and the other end plate is evenly distributed with three vertical and parallel upward opening grooves. The slot in the middle is a rectangular slot, and the T-shaped slots on both sides are used to lock the movable support 6. This adjustable structure is convenient for adjusting the distance between the movable support 6 and the fixed support 2 according to the length of the workpiece 7. The movable support 6 is an angular component, and the bottom plate is provided with a key 6.5 protruding downwards. The key 6.5 with a rectangular cross section cooperates with the rectangular groove of the base 1 to form a straight track structure of the movable support 6 . The top of the movable support 6 is equipped with an axially adjustable structure consisting of a coaxial movable top 6.1, an inner top 6.2, a shaft sleeve 6.3 and a locking screw 6.4. After loosening the vertical screw 6.4, the movable center 6.1 can be adjusted in the axial direction, and the position of the inner center 6.2 relative to the movable center 6.1 can be adjusted by loosening the horizontal locking screw 6.4. Afterwards, just can rotate flat locking screw 6.4 for positioning installation. After the detection is completed, the locking screw 6.4 can be unscrewed, and the movable top 6.1 and the inner top 6.2 are displaced to the left, so that the workpiece 7 can be withdrawn. The fixed support 2 is a positioning support relative to the movable support 6 in the utility model, and it is also the carrier of the built-in measurement structure. The top of the fixed support 2 is provided with a dial indicator 2.1 coaxially installed with the fixed top 2.2 as the carrier, a compression spring 2.3, and a push rod 2.4 to form an axial measurement structure. The compression spring 2.3 in this structure applies a leftward thrust to the push rod 2.4, forcing the left end surface of the push rod 2.4 to always be in contact with the top of the right end of the measuring rod 4, which is beneficial for the measuring rod 4 to transmit axial displacement information. The mandrel 5 is a multi-section straight rod shaft with built-in axial blind holes, and the right end of the mandrel 5 inserted into the inner hole of the workpiece 7 is supported by the fixed top 2.2. The two ends of the workpiece 7 to be detected are coaxially supported by the axial fixed support 2 and the movable support 6 respectively. The left end of the mandrel 5 is a solid shaft section facing the movable support 6 one end, and the center hole provided on the end surface of the shaft section is supported by the inner top 6.2. One end of the mandrel 5 facing the fixed support 2 is provided with an axial blind hole, and the end of the blind hole is provided with a radial through hole penetrating the mandrel 5, and the position of the radial through hole is the measurement position of the inner hole of the target section of the workpiece 7. A measuring rod 4 with a clearance fit is installed in the blind hole. The two ends of the slender measuring rod 4 are provided with tips. The head 5.1 is in contact, and the measuring head 5.1 is composed of a spring 5.2 and a screw 5.3, which is radially and elastically stretched out to measure the structure. The measuring head 5.1, which is elastically tensioned, leans against the inner hole wall of the workpiece 7, and when the workpiece 7 is rotated, the slight radial displacement of the measuring head 5.1 pushes the head of the dial indicator 2.1 axially through the measuring rod 4 and the ejector rod 2.4, so that the percentage The pointer of Table 2.1 is deflected. In the actual measurement, first set the position as zero, and rotate the workpiece 7 for one circle, the arithmetic sum of the deflection of the pointer of the dial indicator 2.1 relative to the zero position is the radial runout value of the inner hole of the target segment of the workpiece 7. In order to intuitively and more accurately display the radial runout of the inner hole of the workpiece 7, the contact ends of the measuring head 5.1 and the measuring rod 4 in the utility model are all cone-shaped, and the bottom section of the measuring head 5.1 is a cone shaft section. The cone angle is 90 ⁰ , and the tips at both ends of the measuring rod 4 are cones, and the cone angle is also 90 ⁰ . This structure converts the radial displacement of the probe 5.1 into the axial displacement of the measuring rod 4 at 1:1, so that the measurement result displayed by the dial indicator 2.1 is the radial runout of the measured inner hole, which can be done without conversion Collect, and use this data to determine whether the tolerance of the inner hole position of the workpiece 7 is qualified.

In the utility model, the two ends of the workpiece 7 and the mandrel 5 are coaxially supported together. This structure achieves coincidence of the positioning reference and the design reference, avoids detection reference errors, and is beneficial to improving detection accuracy. On the other hand, although the two ends of the workpiece 7 are blocked by supports, the built-in measuring structure of the mandrel 5 can design the radial elastic protruding probe 5.1 as required, so that the measurement of the radial runout of the inner hole of the hollow shaft becomes a reality, and the measurement operation is very convenient. Simple, high measurement efficiency, especially suitable for the detection of radial runout in the shaft at the production site.

Claims (3)

1. A radial runout inspection tool for deep holes in a shaft, which includes a base (1), a fixed support (2), a shaft sleeve (3), a measuring rod (4), a mandrel (5) and a movable support (6) The base (1) is a rectangular plate, one end in the length direction of the plate is fixedly connected to the fixed support (2), and the other end plate is evenly distributed with three vertical and parallel upward opening slots, and the slot in the middle is a rectangular slot , the T-shaped slots on both sides are used to lock the movable support (6); the movable support (6) is an angular member, and the bottom plate is provided with a key (6.5) protruding downward, and the key (6.5) and The rectangular groove of the base (1) cooperates to form the straight track structure of the movable support (6); the top of the movable support (6) is equipped with a movable top (6.1), an inner top (6.2), and a shaft sleeve (6.3) coaxially nested and the locking screw (6.4) form an axially adjustable structure; the top of the fixed support (2) is equipped with a dial indicator (2.1) coaxially installed with the fixed top (2.2) as the carrier, a compression spring (2.3), a top The rod (2.4) forms an axial measuring structure, and the two ends of the workpiece (7) are coaxially supported by the fixed support (2) and the movable support (6); the feature is that the mandrel (5) is a built-in axial The multi-section straight rod shaft with blind holes, one end of the mandrel (5) inserted into the inner hole of the workpiece (7) is supported by the fixed top (2.2); the end of the mandrel (5) facing the movable support (6) is a solid shaft section, The central hole provided on the end face of the shaft section is supported by the inner top (6.2); the mandrel (5) is equipped with a measuring rod (4) with clearance fit in the built-in axial blind hole, and the two ends of the slender measuring rod (4) are provided with The tip, one end facing the fixed tip (2.2) is positioned by the sleeve (3), and the other end is in contact with the probe (5.1) that fits in the radial hole of the mandrel (5), and the probe (5.1) is supported by the spring (5.2) and The screw (5.3) forms a radially elastic measuring structure, and the measuring head (5.1) that contacts the inner hole wall of the workpiece (7) produces a corresponding radial displacement with the actual measurement results during the relative rotation process, and the radial displacement drives the momentum rod (4) Axial displacement, the ejector rod (2.4) moving with the measuring rod (4) drives the head of the dial indicator (2.1) to make the pointer shift, and the value shows the inner diameter of the target section of the measured workpiece (7) to the jump value. 2 . The radial runout inspection tool for deep holes in shafts according to claim 1 , characterized in that: the contact point between the measuring head ( 5.1 ) and the measuring rod ( 4 ) is a cone shaft section, and its cone angle is 90 ⁰ . 3 . The deep hole radial runout inspection tool according to claim 1 , characterized in that: the tips at both ends of the measuring rod ( 4 ) are cones, and the cone angle is 60 ⁰ .