CN221685383U - Detection tool for detecting spherical top to tooth back of VGR rack - Google Patents

Abstract

The utility model discloses a checking fixture for detecting the ball top to the tooth back of a VGR rack, which comprises: a bottom plate, a rack limit block, a V-shaped block and a dial indicator detection mechanism located on the bottom plate, wherein the rack limit block and the V-shaped block are used for limiting the position of a workpiece, and the dial indicator detection mechanism is used for detecting the workpiece. The checking fixture can efficiently detect the ball top to the tooth back of VGR racks produced in large quantities, and the checking fixture has low professional requirements for operators, is simple to operate, is quick to use, has low manufacturing cost, and is suitable for mass production and application promotion.

Description

A kind of inspection tool for VGR rack to detect ball top to tooth back

Technical Field

The utility model relates to the field of inspection tool equipment characterized by adopting a mechanical method, in particular to a special inspection tool used for VGR rack inspection from ball top to tooth back.

Background Art

Traditional gear racks have a constant transmission ratio and equidistant teeth, which are called CGR racks. They are generally manufactured by cutting methods such as tooth drawing or milling. With the development of emerging technologies, variable transmission ratio steering gears have been widely used abroad and are gradually being used in China. The rack pitch changes according to the transmission ratio curve, which is called a variable speed ratio rack or VGR rack.

The VGR rack is a variable speed ratio rack used in steering systems. The variable speed ratio (VGR) steering system is different from the traditional rack and pinion steering system. The racks on the steering linkage of the traditional rack and pinion steering system are uniformly dense, while the VGR rack achieves different speed ratios by adjusting the tooth profile parameters. Therefore, the VGR rack speed ratio tooth surface is a curved surface.

At present, the traditional inspection method for VGR racks on the market mainly adopts three-coordinate inspection, but there is no special inspection fixture for inspecting the ball top to the tooth back of VGR racks on the market. In addition, due to the high cost of three-coordinate inspection, high professional requirements for inspection personnel, complex inspection process, difficult operation, high inspection cost and other problems, VGR racks are not conducive to mass production inspection.

Utility Model Content

Purpose of the utility model: In order to solve the deficiencies of the prior art, the utility model provides a gauge for detecting the ball top to the tooth back of a VGR rack. The gauge is simple to operate, quick to use, and can efficiently detect VGR racks produced in large quantities.

Technical solution: In order to achieve the above purpose, the utility model is a kind of inspection tool for VGR rack detection ball top to tooth back, which includes: a bottom plate, a rack limit block, a V-block and a dial indicator detection mechanism located on the bottom plate, the rack limit block and the V-block are used to limit the workpiece, and the dial indicator detection mechanism is used to detect the workpiece;

The dial gauge detection mechanism comprises: a dial gauge, a dial gauge rotary base handle, a positioning shaft with a step, a dial gauge rotary base, a dial gauge rotary base limit pin, a dial gauge base and a cylindrical measuring rod block, the dial gauge base is fixed on the bottom plate, the positioning shaft with a step passes through the dial gauge rotary base to fix the dial gauge rotary base on the dial gauge base, a dial gauge rotary base limit pin is provided at the connection between the dial gauge rotary base and the dial gauge base, a protrusion is provided at the end of the dial gauge rotary base, the dial gauge is passed through the protrusion, and the dial gauge rotary base handle fixed on the protrusion drives the dial gauge rotary base to rotate relative to the dial gauge base;

The cylindrical measuring rod block is located below the dial indicator and opposite to the position of the dial indicator. When the workpiece needs to be inspected, the cylindrical measuring rod block is placed below the workpiece to perform axial positioning of the workpiece, and the dial indicator is placed above the workpiece to inspect the workpiece.

As a further preference of the utility model, multiple rack limit blocks located on the same straight line are fixed to the base plate by means of threaded connection to achieve fine adjustment. Since a waist-shaped hole is provided on the rack limit block, a bolt is passed through the waist-shaped hole on the limit block. When the rack limit block is manually adjusted to the desired position, the rack limit block is fixed to the base plate by tightening the bolt. Since the structure here is the prior art, the specific details of the waist-shaped hole are not described in detail.

As a further preferred embodiment of the present invention, the rotation angle of the dial indicator rotary base relative to the dial indicator base is 270°. After the dial indicator rotary base is driven by the dial indicator rotary base handle to rotate relative to the dial indicator base, the workpiece is smoothly placed on the V-block and abutted against the rack limit block. Then, the dial indicator rotary base handle is manually rotated to drive the dial indicator rotary base to rotate and reset relative to the dial indicator base until the dial indicator base abuts against the limit pin.

As a further preference of the utility model, the V-block is positioned on the base plate by a cylindrical pin. When the V-block needs to be fine-tuned, the cylindrical pin is removed from the base plate, and after manually adjusting the position of the V-block, the V-block is fixed to the base plate using the cylindrical pin again. The base plate is provided with a plurality of threaded holes for adapting the position adjustment of the V-block.

As a further preferred embodiment of the present invention, the "V"-shaped portion on the V-shaped block is used for radial support of the workpiece.

As a further preferred embodiment of the present invention, the rack limit block abuts against the radial outer side of the workpiece.

As a further preferred embodiment of the present invention, the shape of the end of the cylindrical measuring rod block is adapted to the shape of the tooth groove on the workpiece.

As a further preferred embodiment of the present invention, the detection portion on the dial gauge is located on the upper surface of the workpiece, and the cylindrical measuring rod block is located on the lower surface of the workpiece.

As a further preferred embodiment of the present invention, the detection portion and the cylindrical measuring rod block are on the same straight line, thereby ensuring the accuracy and stability of workpiece detection.

As a further preferred embodiment of the present invention, feet are provided below the bottom plate for shock absorption during the inspection of the workpiece.

Beneficial effect: Compared with the prior art, the inspection fixture for detecting the ball top to the tooth back of the VGR rack described in the utility model can efficiently detect the ball top to the tooth back of the VGR rack produced in large quantities, and the inspection fixture has low professional requirements for operators, is simple to operate, quick to use, and has low cost, so it is suitable for mass production and application promotion.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the structure of the utility model after the workpiece is installed;

Figure 2 is a schematic diagram of the limit position of the utility model after the workpiece is installed

FIG3 is a full cross-sectional view of the stepped positioning shaft and the dial indicator rotary base after installation;

FIG4 is a schematic diagram of the structure of the cylindrical measuring rod block;

Figure 5 is a front view of the utility model after the workpiece is installed;

Figure 6 is a left side view of the utility model after the workpiece is installed.

DETAILED DESCRIPTION

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the utility model is a kind of inspection fixture for VGR rack detection ball top to tooth back, which includes: rack limit block 2, dial indicator 3, dial indicator rotary base handle 4, stepped positioning shaft 5, dial indicator rotary base 6, dial indicator rotary base limit pin 7, dial indicator base 8, bottom plate 9, V-block 10 and cylindrical measuring rod block 11.

The rack limit block 2, the V-block 10 and the dial indicator detection mechanism are installed above the bottom plate 9. The rack limit block 2 and the V-block 10 are used to limit the workpiece 1.

The dial gauge base 8 is fixed on the bottom plate 9, the positioning shaft 5 with a step passes through the dial gauge rotary base 6 to fix the dial gauge rotary base 6 on the dial gauge base 8, the dial gauge rotary base handle 4 is manually rotated to drive the dial gauge rotary base 6 to rotate relative to the dial gauge base 8, the connection between the dial gauge rotary base 6 and the dial gauge base 8 is provided with a dial gauge rotary base limit pin 7, the end of the dial gauge rotary base 6 is provided with a convex block 61, the dial gauge 3 is penetrated on the convex block 61, and the cylindrical measuring rod block 11 is located below the dial gauge 3 and opposite to the position of the dial gauge 3;

Example

Step 1: Manually rotate the dial indicator rotary base handle 4 to drive the dial indicator rotary base 6 to rotate relative to the dial indicator base 8, and rotate the rotary base 6 equipped with the dial indicator 3 to one side, as shown in Figures 2 and 3;

Step 2, place the workpiece 1 above the V-block 10, support the workpiece 1 with the V-groove on the V-block 10, the rack limit block 2 abuts against the rotating surface of the workpiece 1 and is adjusted by the preset value of the margin, when fine-tuning the position of the rack limit block 2, first loosen the bolt from the waist-shaped hole on the rack limit block 2, and when the rack limit block 2 is adjusted to the preset value position, fix the rack limit block 2 on the bottom plate 9 with bolts;

Step 3: Place the right tooth surface of the workpiece 1 close to the rack limit block 2 to achieve radial limit, with the tooth surface of the workpiece 1 facing downward, and manually place the cylindrical measuring rod block 11 under the tooth groove to be measured to achieve axial limit, as shown in Figure 4;

Step 4: Manually rotate the dial indicator rotary base handle 4 to drive the rotary base 6 to the position of the dial indicator rotary limit pin 7 and fit it, as shown in Figures 5 and 6;

Step 5. Read the value on the digital dial indicator 3 and record it, then subtract the measured value of the standard workpiece for comparison. If the obtained value is within the tolerance range, it is qualified, otherwise it is unqualified.

The above implementation is only to illustrate the technical concept and features of the utility model, and its purpose is to enable technicians familiar with the technical field to understand the content of the utility model and implement it accordingly, and it cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims (10)

1. A examine utensil that is used for VGR rack to detect ball top to tooth back, its characterized in that: it comprises the following steps: the device comprises a bottom plate (9), a rack limiting block (2), a V-shaped block (10) and a dial indicator detection mechanism, wherein the rack limiting block (2), the V-shaped block (10) and the dial indicator detection mechanism are positioned on the bottom plate (9), the rack limiting block (2) and the V-shaped block (10) are used for limiting a workpiece (1), and the dial indicator detection mechanism is used for detecting the workpiece (1);

The dial indicator detection mechanism include: the dial indicator comprises a dial indicator base (3), a dial indicator rotary base handle (4), a positioning rotating shaft (5) with steps, a dial indicator rotary base (6), a dial indicator rotary base limiting pin (7), a dial indicator base (8) and a cylindrical measuring rod block (11), wherein the dial indicator base (8) is fixed on a bottom plate (9), the positioning rotating shaft (5) with steps passes through the dial indicator rotary base (6) to fix the dial indicator rotary base (6) on the dial indicator base (8), the dial indicator rotary base limiting pin (7) is arranged at the joint of the dial indicator rotary base (6) and the dial indicator base (8), a lug (61) is arranged at the end part of the dial indicator rotary base (6), the dial indicator (3) is arranged on the lug (61) in a penetrating mode, and the dial indicator rotary base handle (4) fixedly arranged on the lug (61) drives the dial indicator rotary base (6) to rotate relative to the dial indicator base (8);

The cylindrical measuring stick block (11) is positioned below the dial indicator (3) and opposite to the dial indicator (3).

2. The gauge for detecting the top-to-back of a ball for a VGR rack according to claim 1, wherein: a plurality of rack limiting blocks (2) positioned on the same straight line are fixed on the bottom plate (9) in a threaded connection mode to realize fine adjustment.

3. The gauge for detecting the top-to-back of a ball for a VGR rack according to claim 1, wherein: the rotation angle of the dial indicator rotary base (6) relative to the dial indicator base (8) is 270 degrees.

4. The gauge for detecting the top-to-back of a ball for a VGR rack according to claim 1, wherein: the V-shaped block (10) is positioned on the bottom plate (9) through a cylindrical pin.

5. The gauge for detecting a ball tip to a tooth back of a VGR rack according to claim 4, wherein: the V-shaped part on the V-shaped block (10) is used for radially supporting the workpiece (1).

6. The gauge for detecting the top-to-back of a ball for a VGR rack according to claim 1, wherein: the rack limiting block (2) is propped against the radial outer side of the workpiece (1).

7. The gauge for detecting the top-to-back of a ball for a VGR rack according to claim 1, wherein: the shape of the end part of the cylindrical measuring rod block (11) is matched with the shape of a tooth slot on the workpiece (1).

8. The gauge for detecting the top-to-back of a ball for a VGR rack according to claim 1, wherein: the detecting part (62) on the dial indicator (3) is positioned on the upper surface of the workpiece (1), and the cylindrical measuring rod block (11) is positioned on the lower surface of the workpiece (1).

9. The gauge for detecting the top-to-back of a ball for a VGR rack as claimed in claim 8, wherein: the detection part (62) and the cylindrical measuring stick block (11) are on the same straight line.

10. The gauge for detecting the top-to-back of a ball for a VGR rack according to claim 1, wherein: the lower part of the bottom plate (9) is provided with a foot margin (12).