Special gauge for tooth back radius of forged VGR rack

Abstract

The utility model discloses a special gauge for the tooth back radius of a forged VGR rack, which comprises a bottom plate, a V-shaped supporting block fixedly arranged on the bottom plate, a linear rail positioned on the bottom plate, a comparison block connecting rod linearly moving in the linear rail, a V-shaped comparison block mounted on the comparison block connecting rod, and a dial indicator arranged in the V-shaped comparison block in a penetrating manner, the end portion of the dial indicator penetrates through the V-shaped comparison block and then abuts against a workpiece placed on the two V-shaped supporting blocks to detect the size of the workpiece, the gauge is short in assembly process and low in manufacturing cost, compared with a three-coordinate profilometer precision gauge, the professional requirement for operators is low, operation is simple, and the work efficiency is high. Products produced in a large scale can be efficiently and rapidly screened, and the testing fixture is low in manufacturing cost and suitable for mass production, application and popularization.

Description

Technical Field

[0001] The utility model relates to the field of gauge equipment characterized by adopting a mechanical method, in particular to a special gauge for forging a VGR rack tooth back radius. Background Art

[0002] With the development of emerging technologies, variable transmission ratio steering gears have been widely used abroad and are gradually being used in China. Traditional gear racks have a constant transmission ratio and the teeth are equidistant, which is called CGR racks. They are generally manufactured by cutting methods such as tooth drawing or milling. The rack pitch changes according to the transmission ratio curve, which is called a variable speed ratio rack or VGR rack. VGR rack is a steering system that combines a rack and a pinion. It has different gear ratios at the center and both ends of the rack. This rack with a variable speed ratio is mostly used in automobile steering systems. The variable speed ratio steering system is different from the traditional gear rack steering system. The rack on the steering linkage on the traditional gear rack steering system is uniformly dense, while the VGR rack achieves different speed ratios by adjusting the tooth profile parameters. Therefore, the VGR rack variable speed ratio tooth surface presents a curved surface.

[0003] The VGR rack processing methods in the prior art are generally organic machining and forging. Organic machining uses high-speed milling or five-axis precision carving. The machining efficiency during forging is low and the precision is high; forging has high efficiency but will cause deformation of the workpiece.

[0004] At present, the traditional detection method for VGR racks in the market mainly adopts three-coordinate detection, using a detection probe to detect the distance from the center of the tooth to the end face. However, there is no special inspection tool on the market for detecting the straightness of the back of the VGR rack (the distance from the center of the tooth to the end face) exceeding 0.15mm, and due to the high cost of three-coordinate detection, high professional requirements for detection personnel, complex detection process, difficult operation, high detection cost and other problems, VGR racks are not conducive to mass production detection.

[0005] For example, Chinese patent CN 114061401 A discloses a method for detecting the tooth height of a straight tooth face tooth: measuring the center height h1 of the face tooth of the gauge; measuring the axial height H3 at the outer circle of the tooth top after the face tooth top of the workpiece is fine-turned; calculating the theoretical center height h3 of the face tooth of the workpiece; after the face tooth of the workpiece is machined, meshing the gauge with the workpiece, measuring the distance H2 between the bottom surface of the gauge and the reference surface of the workpiece; calculating the actual center height h3' of the face tooth of the workpiece, comparing the actual value h3' of the center height of the tooth with the theoretical center height h3, and if it is within the allowable tolerance range, it is considered that the tooth height meets the requirements, and the actual center height h3' is the face tooth tooth height. This method uses the geometric relationship after the workpiece and the gauge mesh, the relationship between the associated dimensions of the workpiece and the parameters of the face tooth to obtain the actual tooth height of the face tooth on the workpiece. It can be seen from this that although this detection method can detect the relationship between the associated dimensions of the workpiece and the parameters of the end face teeth, this situation is detected in the case of straight tooth end face teeth. Since the VGR rack has different gear ratios at the center and both ends of the rack, this method cannot detect racks with different speed ratios achieved by adjusting the tooth profile parameters, nor can it detect the VGR rack tooth back radius size. Utility Model Content

[0006] Purpose of the utility model: In order to solve the deficiencies of the prior art, the utility model provides a special gauge for forging VGR rack tooth back radius, which is simple to operate, quick to use, and efficient for rapid screening of mass-produced products.

[0007] Technical solution: In order to achieve the above purpose, the utility model provides a special forging VGR rack tooth back radius inspection tool, which includes: a bottom plate, a V-shaped support block fixed on the bottom plate and an adjustable inspection mechanism;

[0008] The adjustable detection mechanism includes: a linear rail located on the bottom plate, a comparison block connecting rod that moves linearly in the linear rail, a V-shaped comparison block installed on the comparison block connecting rod and a dial indicator inserted in the V-shaped comparison block. The end of the dial indicator passes through the V-shaped comparison block and then contacts the workpiece placed on the two V-shaped support blocks to perform size detection on the workpiece.

[0009] As a further preferred embodiment of the present invention, a U-shaped block is provided at one end of the V-shaped comparison block, and the U-shaped block is rotated on the comparison block connecting rod to drive the dial indicator to rotate relative to the comparison block connecting rod, and the U-shaped block is moved up and down on the comparison block connecting rod to drive the dial indicator to adjust its height position.

[0010] As a further preferred embodiment of the utility model, by adjusting and rotating the height of the U-shaped block relative to the comparison block connecting rod, the rotation of the dial indicator installed on the V-shaped comparison block relative to the comparison block connecting rod and the adjustment of the height position of the dial indicator relative to the workpiece are achieved.

[0011] As a further preference of the present invention, a bolt is provided at the end of the U-shaped block to fasten the V-shaped contrast block to the contrast block connecting rod, and the two-piece structure at the end of the U-shaped block is connected together by the bolt to fix the V-shaped contrast block on the contrast block connecting rod. When the bolt loosens the two-piece structure at the end of the U-shaped block, the height adjustment of the V-shaped contrast block on the contrast block connecting rod can be achieved.

[0012] As a further preference of the utility model, the linear rail is a T-slot or a dovetail slot, and the connecting block and the linear rail cooperate to realize the T-slot structure or the dovetail slot structure, so that the connecting block drives the comparison block connecting rod to move horizontally in the linear groove under the action of external force.

[0013] As a further preferred embodiment of the present invention, the comparison block connecting rod is vertically fixed to the connecting block.

[0014] As a further preferred embodiment of the present invention, the connection block and the linear rail are connected by a transition fit.

[0015] As a further preferred embodiment of the present invention, the pushing connecting block drives the connecting rod to move linearly in the linear rail.

[0016] As a further preference of the present invention, the trapezoidal groove provided on the V-shaped contrast block is clamped on the radial outer side of the workpiece, the number of the V-shaped support blocks is at least 2, and the radial position of the workpiece is limited by the cooperation of at least two V-shaped support blocks and one trapezoidal groove.

[0017] Beneficial effects: Compared with the prior art, the special gauge for forging VGR rack tooth back radius described in the utility model has few gauge components, a short assembly process and low cost. Compared with three-coordinate and profiler precision gauges, it has low professional requirements for operators and is simple to operate. It can efficiently and quickly screen mass-produced products. The gauge has low cost and is suitable for mass production and application promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the front view of the utility model after the workpiece is installed;

[0019] Figure 2 This is a top view of the utility model after the workpiece is installed;

[0020] Figure 3 This is a partial view of the dial indicator after installation;

[0021] Figure 4 It is a full cross-sectional view of the V-shaped support block;

[0022] Figure 5 It is a top view of the U-shaped block;

[0023] Figure 6 A partial view of the U-shaped block after it is installed on the comparison block connecting rod. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] As shown in the attached drawings, the utility model discloses a special gauge for forging VGR rack tooth back radius, which comprises: a dial indicator 2, a V-shaped comparison block 3, a bottom plate 4, a V-shaped support block 5, a linear rail 6 and a comparison block connecting rod 7.

[0026] A plurality of V-shaped support blocks 5 are fixed on the base plate 4 for supporting the workpiece 1. The linear rail 6 located on the base plate 4 is used to cooperate with the connecting block 71 at the bottom of the comparison block connecting rod 7 to make the comparison block connecting rod 7 move linearly on the linear rail 6. The V-shaped comparison block 3 is sleeved on the upper end of the comparison block connecting rod 7. After the end of the dial indicator 2 passes through the V-shaped comparison block 3, it is abutted against the workpiece 1 placed on the two V-shaped support blocks 5 and the size of the workpiece 1 is detected.

[0027] The trapezoidal groove provided on the V-shaped comparison block 3 is clamped on the radial outer side of the workpiece 1, and cooperates with the multiple V-shaped support blocks 5 to realize the radial positioning of the workpiece 1;

[0028] When it is necessary to place the workpiece 1 on the V-shaped support block 5, the end of the U-shaped block 31 is loosened by the bolt 32, so that the U-shaped block 31 drives the dial indicator 2 installed on the V-shaped comparison block 3 to rotate, and the U-shaped block 31 can move vertically up and down on the comparison block connecting rod 7, so as to smoothly place the workpiece 1 on the V-shaped support block 5 to prevent interference between parts;

[0029] When the workpiece 1 needs to be inspected, the V-shaped comparison block 3 is manually pushed to a limited position, so that the U-shaped block 31 drives the dial gauge 2 installed on the V-shaped comparison block 3 to rotate, and then the U-shaped block 31 is tightened with bolts 32. At this time, if the pointer of the dial gauge 2 rotates to within the qualified line range, the product is judged to be qualified. If the dial gauge 2 rotates outside the qualified line range, the product is judged to be unqualified. When reading the data of the dial gauge 2, the pointer of the dial gauge 2 can also be rotated by the number of grids to read the value.

[0030] 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

1. A special gauge for forging VGR rack tooth back radius, characterized by: It includes: A bottom plate (4), a V-shaped support block (5) fixedly mounted on the bottom plate (4), and an adjustable detection mechanism; The adjustable detection mechanism comprises: a linear rail (6) located on a bottom plate (4), a comparison block connecting rod (7) which moves linearly in the linear rail (6), a V-shaped comparison block (3) mounted on the comparison block connecting rod (7), and a dial indicator (2) inserted into the V-shaped comparison block (3); the end of the dial indicator (2) passes through the V-shaped comparison block (3) and abuts against a workpiece (1) placed on two V-shaped support blocks (5) to perform dimensional detection on the workpiece (1).

2. A special gauge for forged VGR rack tooth back radius according to claim 1, characterized in that: A U-shaped block (31) is provided at one end of the V-shaped comparison block (3).

3. A special gauge for forged VGR rack tooth back radius according to claim 2, characterized in that: By adjusting and rotating the height of the U-shaped block (31) relative to the comparison block connecting rod (7), the rotation of the dial indicator (2) mounted on the V-shaped comparison block (3) relative to the comparison block connecting rod (7) and the adjustment of the height position of the dial indicator (2) relative to the workpiece (1) are achieved.

4. A special gauge for forged VGR rack tooth back radius according to claim 2, characterized in that: The bolts (32) provided at the end of the U-shaped block (31) enable the V-shaped comparison block (3) to be fastened to the comparison block connecting rod (7).

5. A special gauge for forged VGR rack tooth back radius according to claim 1, characterized in that: The linear rail (6) is a T-slot or a dovetail slot.

6. A special gauge for forged VGR rack tooth back radius according to claim 1, characterized in that: The comparison block connecting rod (7) is vertically fixed to the connecting block (71).

7. A special gauge for forged VGR rack tooth back radius according to claim 6, characterized in that: The connection block (71) and the linear rail (6) are connected by a transition fit.

8. A special gauge for forged VGR rack tooth back radius according to claim 1, characterized in that: The trapezoidal groove provided on the V-shaped comparison block (3) is clamped on the radial outer side of the workpiece (1).

9. A special gauge for forged VGR rack tooth back radius according to claim 1, characterized in that: The number of the V-shaped support blocks (5) is at least 2.

Images