One-way dimension measuring mechanism for differential case

Abstract

The present invention provides a one-way dimension measuring mechanism for a differential case, comprising a support seat, a rotary positioning plate, a center hole measuring mechanism, and an end face measuring mechanism. The rotary positioning plate is rotatably arranged on the top of the support seat, and is provided with a measuring position and a transfer position for fixing a workpiece. The center hole measuring mechanism is arranged on the top of the support seat through a mounting plate, and is used to measure the displacement of the center hole on both sides of the differential case. The end face measuring mechanism is arranged on the support seat, and is used to measure the upper and lower end face positions of the differential case. A rotary rocker arm cylinder is provided on the top of the support seat, and the rotary positioning plate is provided at the output end of the rotary rocker arm cylinder. Through the above-mentioned mechanism, the present invention realizes one-way dimension measurement from the center of the horizontal hole of the differential case to the upper and lower inner end faces of the case; and the overall structure is modularly designed, and maintenance and disassembly are simple; in addition, the mechanism also meets the requirements of high precision and high beat of the production line, and is particularly suitable for high-capacity assembly lines, which can greatly improve measurement accuracy and product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of differential production, and in particular to a one-way dimension measuring mechanism for a differential housing. Background Art

[0002] When installing the differential housing and its upper gear, it is necessary to first determine the size of the upper and lower adjustment gaskets. Generally, by measuring the distances H1 and H2 from the center of the hole to the upper and lower end faces, and then combining the theoretical size S after the half-shaft gears and planetary gears are engaged, the theoretical values ​​T1 and T2 of the upper and lower adjustment gaskets can be directly obtained, namely: upper adjustment gasket value: T1 = H1-S ± system correction value; lower adjustment gasket value: T2 = H2-S ± system correction value. Because the S value is the value after the gears are engaged, it can be guaranteed by gear processing. Therefore, the upper and lower adjustment gaskets can be selected in advance without pre-installing the differential gears, and installed in place at one time. This can greatly reduce the time and manpower for repeated disassembly and assembly of the differential and gears, and correspondingly reduce product quality problems caused by human damage during the pre-disassembly process. At the same time, this method can also reduce the machining dimensional accuracy of the horizontal hole and the two inner end faces of the differential housing, directly greatly reducing the processing cost and scrap rate of the differential housing. The effect is very obvious for the current high-capacity and high-automation assembly lines in the industry. Its structure is novel and simple, and its application prospects are broad. Figure 1 、 Figure 2 The figure shows the product structure of the differential assembly. In the figure, number 1 is the differential housing, 2 is the horizontal center shaft, 3 is the planetary gear * 2, 4 is the half-shaft gear * 2, and 5 is the adjustment gasket * 2. Figure 3 The diagram of the measurement target described in this application. The existing technology is generally divided into two types when measuring the upper and lower end faces: one is to directly measure the upper and lower inner end faces, and the horizontal center is assumed to be the size center. After dividing by 2, two equal size values ​​are obtained, such as Figure 4 As shown, this method has a large error. Since the dimensions from the upper and lower inner end faces to the center are different during the actual processing, the final upper and lower adjustment gaskets will be larger on one side and smaller on the other side, resulting in low consistency in final product performance. It may also cause the gasket to be too large and the torque to be too large. Another method is to pre-install the gears and dummy shafts in the differential, and then use a mechanism to measure the play clearance of the upper and lower half-shaft gears, as shown in the figure. Figure 5 As shown, by adjusting the clearance value and selecting the corresponding adjustment shim specifications, the pre-installed gear and dummy shaft are then removed, and the selected adjustment shims, real shaft and gear are installed and reassembled. The biggest problem with this method is repeated disassembly and assembly, which increases the process steps. In addition, the clearance error and wear error caused by the dummy shaft during measurement will cause significant errors in the measured value, which will ultimately still lead to differences in product quality and performance. Therefore, it is necessary to design a method that can solve the above problems of poor measurement accuracy and high assembly times. Summary of the Invention

[0003] The present invention provides a one-way dimension measuring mechanism for a differential case that can solve the problem of measurement accuracy and avoid the problem of secondary assembly after pre-installation in a general manner. The mechanism can greatly improve the degree of automation and reduce the labor cost of the product while improving the final product qualification rate.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A one-way dimension measuring mechanism for a differential case includes a support seat and:

[0006] A rotary positioning plate, which is rotatably arranged on the top of the support seat and is provided with a measuring position and a transfer position for fixing the workpiece;

[0007] A center hole measuring mechanism, which is arranged on top of the support seat through a mounting plate and is used to measure the displacement of the center holes on both sides of the differential housing; and

[0008] The end surface measuring mechanism is arranged on the support seat and is used to measure the upper and lower end surface positions of the differential housing.

[0009] Preferably, a rotary rocker arm cylinder is provided on the top of the support seat, and the rotary positioning plate is arranged at the output end of the rotary rocker arm cylinder.

[0010] Preferably, the mounting plate is fixed on the top of the rotary positioning plate through a support column, and the center hole measuring mechanism includes a hole measuring assembly disposed on both sides of the measuring position, and the hole measuring assembly includes a side driving cylinder disposed at the bottom of the mounting plate and a side displacement sensor disposed at the output end of the side driving cylinder and capable of extending into the center hole to measure the displacement change of the center of the hole.

[0011] Preferably, the end face measuring mechanism includes a horizontal slide that can slide along the top of the mounting plate, an end face measuring assembly arranged on the horizontal slide for measuring the positions of the upper and lower end faces of the differential case, and the end face measuring assembly includes a vertical drive cylinder and a measuring head arranged at the output end of the vertical drive cylinder for contacting the upper and lower end faces of the differential case, and a vertical displacement sensor for measuring the displacement change of the upper and lower end faces of the differential case.

[0012] Preferably, the vertical displacement sensor includes an upper end surface displacement sensor provided on the mounting plate for measuring the displacement change of the upper end surface of the differential case and a lower end surface displacement sensor provided on the support seat for measuring the displacement change of the lower end surface of the differential case.

[0013] Preferably, the bottom of the support seat is also provided with a lifting telescopic shaft for driving the vertical displacement of the lower end surface displacement sensor.

[0014] Preferably, it also includes a lifting cylinder arranged on the support seat for lifting the differential housing on the measuring position to the measuring height.

[0015] Preferably, a guide rail is provided on the top of the mounting plate, a slider matching the guide rail is provided on the bottom of the horizontal slide, and a horizontal driving cylinder for driving the horizontal slide to slide is also provided on the top of the mounting plate.

[0016] It can be seen from the above technical solution that the present invention has the following beneficial effects: in the present invention, after the differential housing reaches the measuring position with the rotary positioning plate, the differential housing is fixed, and the center hole measuring mechanism is used to measure the position of the center holes on both sides of the differential housing, and the actual horizontal center axis position of the two points is obtained after comparison with the calibration parts. After the actual center axis is determined, the position of the upper and lower end faces of the differential housing is measured by the end face measuring mechanism, and the actual upper and lower end face positions are obtained after comparison with the calibration parts. Subsequently, the terminal equipment, such as a computer, automatically compares and calculates to obtain the upper and lower adjustment gasket values, and then feeds back to the subsequent gasket material library system to select the corresponding size gasket to complete the automatic measurement and gasket selection process. The present invention realizes the one-way dimension measurement from the center of the horizontal hole of the differential housing to the upper and lower inner end faces of the housing through the above-mentioned mechanism; and the overall structure is modularly designed, and maintenance and disassembly are simple; in addition, the mechanism also meets the requirements of high precision and high beat of the production line, and is particularly suitable for high-capacity assembly lines, which can greatly improve measurement accuracy and product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the differential assembly product structure;

[0018] Figure 2 for Figure 1 Schematic diagram of the structure of part A;

[0019] Figure 3 Schematic diagram of measurement targets H1 and H2;

[0020] Figure 4 This is a schematic diagram of bisecting the upper and lower end face dimensions;

[0021] Figure 5 Schematic diagram for measuring the up and down clearance;

[0022] Figure 6 It is a front view of the present invention;

[0023] Figure 7 for Figure 6 Side view of

[0024] Figure 8 A perspective view of the present invention;

[0025] Figure 9 for Figure 8 Top view of .

[0026] In the figure: 10, support base; 110, rotary rocker cylinder; 20, rotary positioning plate; 30, center hole measuring mechanism; 310, side drive cylinder; 320, side displacement sensor; 40, mounting plate; 410, guide rail; 420, horizontal drive cylinder; 50, end face measuring mechanism; 510, horizontal slide; 520, vertical drive cylinder; 530, measuring head; 541, upper end face displacement sensor; 542, lower end face displacement sensor; 60, support column; 70, lifting and telescopic shaft; 80, lifting cylinder. DETAILED DESCRIPTION

[0027] A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Reference Figure 6 、 Figure 7 、 Figure 8 as well as Figure 9 A one-way dimension measuring mechanism for a differential case includes a support seat 10, a rotary positioning plate 20, a center hole measuring mechanism 30, and an end face measuring mechanism 50. The rotary positioning plate 20 is rotatably arranged on the top of the support seat 10, and is provided with a measuring position and a transfer position for fixing the workpiece. The center hole measuring mechanism 30 is arranged on the top of the support seat 10 through the mounting plate 40, and is used to measure the displacement of the center holes on both sides of the differential case. The end face measuring mechanism is arranged on the support seat, and is used to measure the upper and lower end face positions of the differential case. In this way, the differential case rotates After the positioning plate reaches the measuring position, the differential housing is fixed, and the center hole measuring mechanism is used to measure the position of the center holes on both sides of the differential housing, and the actual horizontal center axis position of the two points is obtained after comparison with the calibration parts. After the actual center axis is determined, the position of the upper and lower end faces of the differential housing is measured by the end face measuring mechanism, and the actual upper and lower end face positions are obtained after comparison with the calibration parts. Subsequently, the terminal equipment, such as a computer, automatically compares and calculates to obtain the upper and lower adjustment gasket values, which are then fed back to the subsequent gasket material library system to select the corresponding size gaskets to complete the automatic measurement and gasket selection process.

[0029] As a preferred technical solution of the present invention, a rotary rocker arm cylinder 110 is provided on the top of the support seat 10, and the rotary positioning plate 20 is arranged at the output end of the rotary rocker arm cylinder 110. In this way, the switching between the transfer position and the measuring position is realized by the rotational movement of the rotary rocker arm cylinder, and the differential housing to be measured at the transfer position can be transferred to the measuring position, and the differential housing after the measurement is completed can be transferred to the transfer position for easy unloading.

[0030] As a preferred technical solution of the present invention, in order to facilitate the fixing of the mounting plate 40 above the rotary positioning plate 20, a support column 60 is also vertically fixed on the top of the support seat 10, and the mounting plate 40 is fixed on the top of the support column 60. Furthermore, the center hole measuring mechanism 30 includes a hole measuring component disposed on both sides of the measuring position, and the hole measuring component includes a side driving cylinder 310 and a side displacement sensor 320. The side driving cylinder 310 is arranged at the bottom of the mounting plate 40, and the side displacement sensor 320 is arranged at the output end of the side driving cylinder 310 and can be extended into the center hole to measure the displacement change of the center of the hole. Specifically, in order to facilitate the distinction of the above-mentioned hole measuring components, the cylinders on both sides can be named as the left driving cylinder and the right driving cylinder, and the side displacement sensors can be named as the left displacement sensor and the right displacement sensor, respectively. The cylinders on the left and right sides drive the corresponding displacement sensors to enter the center holes on the left and right sides of the differential housing, thereby obtaining the displacement change on both sides of the center hole to determine the position of the horizontal center axis.

[0031] As a preferred technical solution of the present invention, the end face measuring mechanism 50 includes a horizontal slide 510 and an end face measuring assembly. The horizontal slide 510 can slide along the top of the mounting plate 40. The end face measuring assembly is arranged on the horizontal slide 510 for measuring the upper and lower end face positions of the differential case. Specifically, the end face measuring assembly includes a vertical driving cylinder 520, a measuring head 530 and a vertical displacement sensor. The measuring head 530 is arranged at the output end of the vertical driving cylinder 520 for contacting the upper and lower end faces of the differential case. The vertical displacement sensor is used to measure the displacement change of the upper and lower end faces of the differential case. Further, the vertical driving cylinders can be named as the upper driving cylinder and the lower driving cylinder, and the measuring heads can be named as the upper measuring head and the lower measuring head, respectively. The upper measuring head is arranged at the output end of the upper driving cylinder. The output end and the lower measuring head are arranged at the output end of the lower driving cylinder. The vertical displacement sensor can also be divided into an upper end face displacement sensor 541 and a lower end face displacement sensor 542. Specifically, the upper end face displacement sensor 541 is arranged on the mounting plate 40 to measure the displacement change of the upper end face of the differential case, and the lower end face displacement sensor 542 is arranged on the support seat 10 to measure the displacement change of the lower end face of the differential case. In this way, the upper measuring head is driven by the upper driving cylinder to contact the upper end face of the differential case, and the lower measuring head is driven by the lower driving cylinder to contact the lower end face. The different change values ​​generated by the compression of the upper end face displacement sensor and the lower end face displacement sensor are then combined to determine the positions of the upper and lower end faces, so as to realize the measurement of the positions of the upper and lower end faces of the differential case.

[0032] In order to facilitate the sliding of the horizontal slide 510 along the mounting plate 40, a guide rail 410 is provided on the top of the mounting plate 40, and a slider matching the guide rail is provided at the bottom of the horizontal slide 510. A horizontal driving cylinder 420 for driving the horizontal slide 510 to slide is also provided on the top of the mounting plate. In this way, driven by the horizontal driving cylinder 420, the slider is driven to move in a straight line along the guide rail, thereby realizing the movement of the horizontal slide 510 along the mounting plate 40, so that the upper and lower measuring heads on the horizontal plate 510 reach the measurement center position.

[0033] Furthermore, a lifting and telescopic shaft 70 is provided at the bottom of the support seat 10, and the lifting and telescopic shaft 70 is used to drive the vertical displacement of the lower end surface displacement sensor 542, so that the lower end surface displacement sensor is extended upward by the lifting and telescopic shaft 70 to contact the lower end surface of the differential case to measure the position of the lower end surface.

[0034] As a preferred technical solution of the present invention, it also includes a lifting cylinder 80 arranged on the support base 10 for lifting the differential housing on the measuring position to the measuring height. The lifting cylinder 80 is used to drive the differential housing to the measuring height and fix the differential housing up and down.

[0035] During use, after the differential housing reaches the measuring position along with the rotary positioning plate 20, the differential housing is lifted and fixed at the measuring height by the lifting cylinder 80. After the differential is fixed, the side drive cylinder 310 drives the side displacement sensor 320 to extend into the center holes on both sides of the differential housing, measures the center displacement change of the center holes on both sides, and obtains the actual horizontal center axis position after comparing with the calibration parts. After the actual center axis is determined, the upper drive cylinder is used to drive the upper measuring head to contact the upper end face of the differential housing, and the lower drive cylinder is used to drive the lower measuring head so that the lower measuring head contacts the lower end face. The different change values ​​generated by the compression upper end face displacement sensor 541 and the lower end face displacement sensor 542 are then combined to determine the positions of the upper and lower end faces, so as to measure the positions of the upper and lower end faces of the differential housing and obtain the actual upper and lower end face positions. The computer is then used to automatically compare and calculate to obtain the required upper and lower gasket values, which are then fed back to the gasket material library system to select the corresponding size gaskets to complete the automatic measurement and gasket selection process.

[0036] The above-described embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A one-way dimension measuring mechanism for a differential case, comprising a support seat (10), characterized in that: Also includes: A rotary positioning plate (20), the rotary positioning plate (20) being rotatably arranged on the top of the support seat (10), and having a measuring position and a transfer position for fixing a workpiece; A center hole measuring mechanism (30), the center hole measuring mechanism (30) being arranged on the top of the support seat (10) via a mounting plate (40) and being used for measuring the displacement of the center holes on both sides of the differential housing; and An end surface measuring mechanism (50), the end surface measuring mechanism (50) being arranged on a support seat and used for measuring the positions of the upper and lower end surfaces of the differential housing; The center hole measuring mechanism (30) includes a hole measuring assembly disposed on both sides of a measuring position, the hole measuring assembly including a side driving cylinder (310) disposed at the bottom of a mounting plate (40) and a side displacement sensor (320) disposed at an output end of the side driving cylinder (310) and capable of extending into the center hole to measure a displacement change of the center of the hole. The side driving cylinders (310) on the left and right sides drive the corresponding side displacement sensors (320) into the center holes on the left and right sides of the differential housing, thereby obtaining a displacement change on both sides of the center hole to determine the position of the horizontal center axis. The end surface measurement mechanism (50) comprises a horizontal slide (510) capable of sliding along the top of the mounting plate (40), and an end surface measurement component arranged on the horizontal slide (510) for measuring the positions of the upper and lower end surfaces of the differential housing; The end surface measurement assembly comprises a vertical drive cylinder (520), a measuring head (530) provided at the output end of the vertical drive cylinder (520) for contacting the upper and lower end surfaces of the differential case, and a vertical displacement sensor for measuring the displacement of the upper and lower end surfaces of the differential case; The vertical displacement sensor comprises an upper end surface displacement sensor (541) arranged on the mounting plate (40) for measuring the displacement variation of the upper end surface of the differential housing, and a lower end surface displacement sensor (542) arranged on the support seat (10) for measuring the displacement variation of the lower end surface of the differential housing. The bottom of the support seat (10) is also provided with a lifting telescopic shaft (70) for driving the vertical displacement of the lower end surface displacement sensor (542); The differential case one-way dimension measuring mechanism further comprises a lifting cylinder (80) provided on the support seat (10) for lifting the differential case at the measuring position to a measuring height; A guide rail (410) is provided on the top of the mounting plate (40), a slider matching the guide rail (410) is provided on the bottom of the horizontal slide plate (510), and a horizontal driving cylinder (420) for driving the horizontal slide plate (510) to slide is also provided on the top of the mounting plate (40).

2. The one-way dimension measuring mechanism for a differential case according to claim 1, characterized in that: A rotary rocker cylinder (110) is provided on the top of the support seat (10), and the rotary positioning plate (20) is arranged at the output end of the rotary rocker cylinder (110).

3. The one-way dimension measuring mechanism for a differential case according to claim 2, characterized in that: The mounting plate (40) is fixed on the top of the rotary positioning plate (20) via a support column (60).

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