Internal spiral raceway hand-held measuring instrument

Abstract

The present invention discloses an internally spiral raceway hand-held measuring instrument, belonging to the technical field of measuring devices, and characterized in that: it includes a main housing, a measuring mechanism and a positioning mechanism; the measuring mechanism is installed in the guiding groove of the main housing, and the positioning mechanism is installed on the measuring mechanism; the measuring mechanism includes a slider, a measuring arm and a dial indicator, and the slider is slidably matched with the main housing; a dial indicator is installed at the upper end of the main housing, and the measuring rod of the dial indicator passes through the through hole on the main housing and abuts against the upper end of the slider; the positioning mechanism includes a cage and a ball, cages are respectively installed on the outer surface of the measuring arm, the placement cavities on the two cages are distributed along a spiral line, an opening communicating with the placement cavity is provided on the outer surface of the cage, balls are installed in the placement cavities of the cage, the balls are exposed from the openings of the placement cavities, and the opening area of the placement cavity is smaller than the diameter of the ball. Compared with the prior art, it has the characteristics of realizing rapid positioning and reducing measurement errors.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring devices, and particularly to a handheld measuring instrument for an internal spiral raceway. Background Art

[0002] The steering gear is an important component in an automobile and plays a crucial role in the vehicle's handling performance and safe driving. The rack piston is one of the key parts of the steering gear, integrating the nut and the rack and acting as a hydraulic piston within the steering gear housing. The coaxiality between the outer circle of the rack piston and the internal thread raceway must be within 0.025 mm; otherwise, the hydraulic steering gear will not operate properly, thus affecting driving safety. Therefore, during the current detection process of the internal spiral raceway, it is a very important task to improve the detection quality and efficiency of the internal spiral raceway.

[0003] For the existing measuring devices for spiral raceways, due to the difficulty in accurately centering and positioning with the center of the internal spiral raceway, there are relatively large errors in the measurement results. Summary of the Invention

[0004] The purpose of the present invention is to address the above deficiencies in the prior art and provide a handheld measuring instrument for an internal spiral raceway, achieving the purpose of rapid positioning and reducing measurement errors.

[0005] A handheld measuring instrument for an internal spiral raceway provided by the present invention is characterized in that it includes a main housing, a measuring mechanism, and a positioning mechanism; a guiding groove with one end open is provided on the main housing, the measuring mechanism is installed within the guiding groove of the main housing, and the positioning mechanism is installed on the measuring mechanism; the measuring mechanism includes a slider, a measuring arm, and a dial indicator, and the slider is slidably matched with the guiding groove of the main housing; a dial indicator is installed at the upper end of the main housing, and the measuring rod of the dial indicator passes through a through hole on the main housing and abuts against the upper end of the slider; the positioning mechanism includes a cage and a ball, cages are respectively installed on the outer surface of the measuring arm, the two cages are arranged oppositely, a placement cavity is provided on the cage, the placement cavities on the two cages are distributed along a spiral, an opening communicating with the placement cavity is provided on the outer surface of the cage, a ball is installed within the placement cavity of the cage, the ball is exposed from the opening of the placement cavity, and the opening area of the placement cavity is smaller than the diameter of the ball.

[0006] A guiding rod is installed within the guiding groove of the above-mentioned main housing, a guiding through hole corresponding to the guiding rod is provided on the slider, and the guiding rod is matched with the guiding through hole of the slider.

[0007] The lower end of the above-mentioned slider is connected to the lower end wall of the guiding groove of the main housing through a compression spring.

[0008] A long strip through-hole is provided on the back plate of the guiding groove of the main housing described above. The upper handle passes through the long strip through-hole on the back plate of the main housing and is connected to the slider. The lower half of the main housing is connected to the lower handle, and the lower handle is located below the upper handle.

[0009] The above-mentioned cage and the measuring arm are detachably connected.

[0010] The above-mentioned measuring arm includes an upper measuring arm and a lower measuring arm. One end of the upper measuring arm is connected to the slider, and one end of the lower measuring arm is connected to the main housing.

[0011] The cage installed on the above-mentioned upper measuring arm is an upper cage, and the cage installed on the lower measuring arm is a lower cage. One ball is installed on the upper cage, and four balls are installed on the lower cage. The five balls form a section of spiral line. The four balls installed on the lower cage are distributed in two sections of thread lines in pairs and are spaced apart by a lead distance.

[0012] Compared with the prior art, the present invention has the following prominent beneficial effects:

[0013] 1. The present invention has a positioning mechanism, and the positioning mechanism is balls distributed in a spiral shape. When measuring the pitch diameter of the internal spiral raceway, the balls can quickly reach the tooth wall of the internal spiral raceway to achieve quick positioning.

[0014] 2. The cage of the present invention is detachably connected to the upper measuring arm and the lower measuring arm respectively. When measuring internal spiral raceways with different leads, only the corresponding cage needs to be replaced, achieving the effect of multi-purpose of one machine and improving adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of Embodiment 1.

[0016] Figure 2 is a schematic internal structural diagram of Embodiment 1.

[0017] Figure 3 is a schematic structural diagram of Embodiment 2.

[0018] Figure 4 is a top view of Embodiment 2.

[0019] Figure 5 is a schematic internal structural diagram of Embodiment 2.

[0020] Figure 6 is Figure 5 a partial enlarged view of part A in

[0021] Figure 7 is a schematic structural diagram of the lower measuring arm part in Embodiment 3. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0023] As Figure 1 and 2 shown, Embodiment 1 includes a main housing 1, a measuring mechanism 2, and a positioning mechanism 3.

[0024] A guiding groove with one end open is provided on the main housing 1. The measuring mechanism 2 is installed in the guiding groove of the main housing 1, and the positioning mechanism 3 is installed on the measuring mechanism 2.

[0025] The measuring mechanism 2 includes a slider 22, a measuring arm 23, and a dial indicator 21. The slider 22 is slidably engaged with the guiding groove of the main housing 1. The specific engagement method is as follows: A plurality of guiding rods 24 are installed in the guiding groove of the main housing 1. The slider 22 is provided with guiding through holes corresponding to the guiding rods 24, and the guiding rods 24 are engaged with the guiding through holes of the slider 22.

[0026] The lower end of the slider 22 is connected to the lower end wall of the guiding groove of the main housing 1 through a compression spring. The measuring arm 23 includes an upper measuring arm 231 and a lower measuring arm 232. One end of the upper measuring arm 231 is fixedly connected to the slider 22, and one end of the lower measuring arm 232 is fixedly connected to the main housing 1. The lower measuring arm 232 is located directly below the upper measuring arm 231.

[0027] A through hole is provided on the upper end wall of the guiding groove of the main housing 1. The dial indicator 21 is installed at the upper end of the main housing 1, and its measuring rod passes through the through hole on the main housing 1 and abuts against the upper end of the slider 22.

[0028] A long through hole is provided on the back plate of the guiding groove of the main housing 1. The upper handle 25 passes through the long through hole on the back plate of the main housing 1 and is connected to the slider 22. The lower half of the main housing 1 is connected to the lower handle 26. The lower handle 26 is located below the upper handle 25. The upper handle 25 and the lower handle 26 facilitate the holding and operation of the device.

[0029] The positioning mechanism 3 includes a cage 32 and balls 31. Cages 32 are respectively installed on the outer surfaces of the upper measuring arm 231 and the lower measuring arm 232. The two cages 32 are arranged oppositely. The cage 32 is provided with a placement cavity. The placement cavities on the two cages 32 are distributed along a spiral. An opening communicating with the placement cavity is provided on the outer surface of the cage 32. Balls 31 are installed in the placement cavity of the cage 32. The balls 31 are exposed from the opening of the placement cavity, so as to be able to abut against the tooth wall of the inner spiral raceway. The opening area of the placement cavity is smaller than the diameter of the balls 31, so as to prevent the balls 31 from being exposed from the opening of the placement cavity.

[0030] The balls 31 on the cages 32 of the upper measuring arm 231 and the lower measuring arm 232 are located on the same spiral line.

[0031] In this embodiment, the cage 32 is detachably connected to the upper measuring arm 231 and the lower measuring arm 232 respectively. The detachable connection method is that the cage 32 is connected to the upper measuring arm 231 and the lower measuring arm 232 through pins or bolts respectively.

[0032] In an optimized solution, the cage 32 is provided with multiple convex platforms distributed in a spiral shape, and placement cavities are provided on the convex platforms.

[0033] In this embodiment, the cage 32 installed on the upper measuring arm 231 is the upper cage 321, and the cage 32 installed on the lower measuring arm 232 is the lower cage 322. One ball 31 is installed on the upper cage 321, and four balls 31 are installed on the lower cage 322. The five balls 31 form a section of spiral line. The four balls 31 installed on the lower cage 322 are distributed in two sections of thread lines in pairs and are separated by a lead distance. When measuring the internal spiral raceway, the five balls 31 are made to abut against the tooth wall of the internal spiral raceway. Since the pitch and helix angle of the spiral line formed by the five balls 31 are the same as those of the internal spiral raceway. Therefore, the axis of the spiral line where the five balls 31 are located coincides with the axis of the internal spiral raceway, enabling rapid positioning.

[0034] The operation process is as follows: When using the present invention to measure the internal spiral raceway, select a cage 32 whose spiral line formed by the balls 31 on the cage 32 has the same pitch as the internal thread raceway. Press the slider 22 downward through the upper handle 25 to compress the compression spring, so that the upper measuring arm 231 and the lower measuring arm 232 are butted against each other. Place the upper measuring arm 231 and the lower measuring arm 232 into the internal spiral raceway, and release the upper handle 25 to make the balls 31 on the upper measuring arm 231 and the lower measuring arm 232 abut against the tooth wall of the internal spiral raceway. The middle diameter size of the internal spiral raceway is displayed through the dial indicator 21.

[0035] In Embodiment 1, when it is necessary to measure internal spiral raceways with different pitches, it is necessary to replace the corresponding cage 32 with a pitch placement cavity. This is not only cumbersome to operate, but also requires a series of matching cages 32, resulting in a high cost. In Embodiment 2, the distance between the balls 31 installed on the upper measuring arm 231 and the lower measuring arm 232 can be adjusted, so as to meet the requirements of internal spiral raceways with different pitches.

[0036] Such as Figures 4 - 6As shown, in Embodiment 2, an inner placement groove is provided on the measuring arm 23, and corresponding outer placement grooves are respectively provided on the cage 32. A long strip-shaped opening is provided on the outer surface of the cage 32 and communicates with the outer placement groove. The width of the long strip-shaped through hole of the cage 32 is smaller than the diameter of the ball 31. A chute is provided at the bottom of the inner placement groove of the measuring arm 23. A lead screw 33 is installed in the chute. One end of the lead screw 33 is rotatably fitted with the wall at one end of the chute, and the other end passes through the wall at the other end of the chute and is connected to the countersunk head. A guide block 35 is installed in the chute. Both ends of the guide block 35 are in contact with the chute wall. A threaded through hole is provided on the guide block 35. The threaded through hole of the guide block 35 is matched with the lead screw 33. The guide block 35 is fixedly connected to the ball cage 34. The ball 31 is installed on the ball cage 34. The ball 31 is installed in the cavity formed by the outer guide groove of the cage 32 and the inner guide groove of the measuring arm 23 and is exposed through the long strip-shaped opening of the cage 32.

[0037] By adjusting the rotation of the lead screw 33, the distance between different balls 31 can be adjusted, so as to meet the inner spiral raceways with different pitches.

[0038] In this embodiment, an inner placement groove is provided on the upper measuring arm 231, and a ball 31 is installed in the inner placement groove of the upper measuring arm 231. Two inner placement grooves are provided on the lower measuring arm 232. The three placement grooves are distributed in a circular shape. Two balls 31 are installed in each guide groove of the lower measuring arm 232. The lead screw 33 in the chute of the lower measuring arm 232 is a bidirectional lead screw. The two threads of the bidirectional lead screw are respectively matched with the threaded through holes of a guide block 35.

[0039] In Embodiment 2, the requirement of the inner spiral raceway with different pitches can be met by adjusting the distance between the balls 31, but the requirement of the inner spiral raceway with different thread lead angles cannot be met. In Embodiment 3, the requirements of the inner spiral raceways with different pitches and different thread lead angles can be met simultaneously.

[0040] As Figure 7 As shown, in Embodiment 3, two inner placement grooves are provided on the lower measuring arm 232. Two balls 31 are installed in each placement groove of the lower measuring arm 232. Two lead screws 33 and two guide blocks 35 are installed in each chute of the lower measuring arm 232. A threaded through hole and a guide through hole are respectively provided on the two guide blocks 35. The threaded holes of the two guide blocks 35 are respectively threadedly matched with different lead screws 33. The other lead screw 33 passes through the guide through hole of the guide block 35. Each guide block 35 is respectively connected to a ball cage 34. By adjusting each ball 31 separately, five balls 31 can form a spiral line with different pitches and helix angles.

[0041] It should be noted that specific embodiments of the present invention have been described in detail. For those skilled in the art, various obvious changes made without departing from the spirit and scope of the present invention are within the protection scope of the present invention.

Claims

1. A handheld measuring instrument with an internal spiral raceway, characterized in that: It includes a main housing (1), a measuring mechanism (2) and a positioning mechanism (3); a guiding groove with one end open is provided on the main housing (1), the measuring mechanism (2) is installed in the guiding groove of the main housing (1), and the positioning mechanism (3) is installed on the measuring mechanism (2); the measuring mechanism (2) includes a slider (22), a measuring arm (23) and a dial indicator (21), and the slider (22) is in sliding fit with the guiding groove of the main housing (1); the dial indicator (21) is installed at the upper end of the main housing (1), and the measuring rod of the dial indicator (21) passes through the through hole on the main housing (1) and abuts against the upper end of the slider (22); the positioning mechanism (3) includes a cage (32) and balls (31), cages (32) are respectively installed on the outer surface of the measuring arm (23), the two cages (32) are arranged oppositely, a placement cavity is provided on the cage (32), the placement cavities on the two cages (32) are distributed along a spiral, an opening communicating with the placement cavity is provided on the outer surface of the cage (32), balls (31) are installed in the placement cavity of the cage (32), and the balls (31) are exposed from the opening of the placement cavity, and the opening area of the placement cavity is smaller than the diameter of the balls (31); an inner placement groove is provided on the measuring arm (23), outer placement grooves corresponding to the inner placement groove are respectively provided on the cage (32), a long strip-shaped opening communicating with the outer placement groove is provided on the outer surface of the cage (32), the width of the long strip-shaped through hole of the cage (32) is smaller than the diameter size of the balls (31), a chute is provided at the bottom of the inner placement groove of the measuring arm (23), a lead screw (33) is installed in the chute, one end of the lead screw (33) is rotationally matched with the wall at one end of the chute, and the other end passes through the wall at the other end of the chute and is connected with a countersunk head; a guiding block (35) is installed in the chute, both ends of the guiding block (35) are in fit with the chute wall, a threaded through hole is provided on the guiding block (35), the threaded through hole of the guiding block (35) is in cooperation with the lead screw (33), the guiding block (35) is fixedly connected with a ball cage (34), balls (31) are installed on the ball cage (34), the balls (31) are installed in the cavity formed by the outer guiding groove of the cage (32) and the inner guiding groove of the measuring arm (23), and are exposed from the long strip-shaped opening of the cage (32); an inner placement groove is provided on the upper measuring arm (231), and one ball (31) is installed in the inner placement groove of the upper measuring arm (231); two inner placement grooves are provided on the lower measuring arm (232), the three placement grooves are distributed in a circular shape, two balls (31) are installed in each guiding groove of the lower measuring arm (232), and the lead screw (33) in the chute of the lower measuring arm (232) is a bidirectional lead screw, and the two sections of threads of the bidirectional lead screw are respectively in cooperation with the threaded through holes of a guiding block (35).

2. The hand-held measuring instrument with an internal spiral raceway according to claim 1, wherein: A guiding rod (24) is installed in the guiding groove of the main housing (1), a guiding through hole corresponding to the guiding rod (24) is provided on the slider (22), and the guiding rod (24) is in cooperation with the guiding through hole of the slider (22).

3. The hand-held measuring instrument with an internal spiral raceway according to claim 1, characterized in that: The lower end of the slider (22) is connected with the lower end wall of the guiding groove of the main housing (1) through a compression spring.

4. The hand-held measuring instrument with an internal spiral raceway according to claim 1, wherein: A long strip through hole is provided on the back plate of the guiding groove of the main housing (1). The upper handle (25) passes through the long strip through hole on the back plate of the main housing (1) and is connected to the slider (22). The lower half of the main housing (1) is connected to the lower handle (26), and the lower handle (26) is located below the upper handle (25).

5. The hand-held measuring instrument with an internal spiral raceway according to claim 1, characterized in that: The cage (32) and the measuring arm (23) are detachably connected.

6. The handheld measuring instrument with an internal spiral raceway according to claim 1, characterized in that: The measuring arm (23) includes an upper measuring arm (231) and a lower measuring arm (232). One end of the upper measuring arm (231) is connected to the slider (22), and one end of the lower measuring arm (232) is connected to the main housing (1).

7. The handheld measuring instrument with an internal spiral raceway according to claim 6, characterized in that: The cage (32) installed on the upper measuring arm (231) is the upper cage (321), and the cage (32) installed on the lower measuring arm (232) is the lower cage (322). One ball (31) is installed on the upper cage (321), and four balls (31) are installed on the lower cage (322). The five balls (31) form a section of spiral line. The four balls (31) installed on the lower cage (322) are distributed in two sections of thread lines in pairs and are separated by a lead distance.

Images