CN210321526U

CN210321526U - Camshaft cam lift detecting tool

Info

Publication number: CN210321526U
Application number: CN201921557845.5U
Authority: CN
Inventors: 邓贤森; 罗刚; 莫艳梅; 黄翃修; 覃国杰; 宁琨; 马慧斌; 谢日东
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-04-14
Anticipated expiration: 2029-09-19

Abstract

The utility model discloses a camshaft cam lift gauge, which belongs to the technical field of detection tools and solves the problem of lower precision of detecting camshaft cam lift by using a vernier caliper or a micrometer; the detecting tool comprises a dial indicator, a guide shaft and a guide sleeve which are coaxially arranged, wherein the guide shaft is a stepped shaft, a stepped hole matched with the guide shaft is formed in the guide sleeve, the dial indicator is fixed in an opening in the top end of the guide sleeve and is connected with the top end of the guide shaft, the guide shaft is inserted in the guide sleeve in a sliding mode, a spring is sleeved on the upper portion of the guide shaft, one end of the spring tightly abuts against the stepped surface of the guide shaft, the other end of the spring tightly abuts against the stepped surface of the guide sleeve, rollers are arranged at the bottom end of the guide shaft, a limiting groove is further formed in the guide shaft, and a limiting screw matched with the limiting groove is arranged at the bottom of the guide sleeve. The utility model discloses can realize the accurate measurement of camshaft cam lift.

Description

Camshaft cam lift detecting tool

Technical Field

The utility model relates to a detection tool technical field, more specifically say, especially relate to an utensil is examined in camshaft cam lift.

Background

The camshaft is a component in a piston engine, and the cam lift refers to the distance difference between the highest point and the lowest point of the central surface of the camshaft. Its function is to control the opening and closing action of the valve. Because the valve motion law is related to the power and the running characteristics of an engine, the cam lift is required to be very accurate in the manufacturing process of the engine. The detection of the cam lift is obtained by the detection and conversion of a vernier caliper or an external micrometer, and the lift detection of the specific cam profile is obtained by the detection of the maximum distance of the vernier caliper or the external micrometer and subtracting the circular diameter. The detection mode has low repetition precision and higher requirement on the skills of a detector, and is not beneficial to realizing the measurement of the cam lift of the cam shaft in batch and with high precision.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an utensil is examined to camshaft cam lift utilizes this to examine the utensil and can realize adjusting well and show the dial indicator with camshaft surface shape change in real time with the vertical of camshaft, has reduced the precision error of artifical detection.

The utility model adopts the technical scheme as follows:

the utility model provides an utensil is examined in camshaft cam lift, includes the percentage table, still includes the guiding axle and the uide bushing of coaxial arrangement, the guiding axle is the shoulder shaft, set up in the uide bushing with the shoulder hole of guiding axle looks adaptation, the percentage table is fixed in the uide bushing top opening and with the guiding axle top links to each other, the guiding axle slides and alternates in the uide bushing, the upper portion cover of guiding axle is equipped with the spring, spring one end top is tight the ladder face of guiding axle, other end top is tight the ladder face of uide bushing, the guiding axle bottom is provided with the gyro wheel, still be provided with the spacing groove on the guiding axle, the uide bushing bottom be provided with the stop screw of spacing groove looks adaptation.

Further, the length of the limiting groove is larger than the cam lift of the camshaft.

Furthermore, the top end of the guide shaft is provided with an opening matched with the bottom end of the dial indicator probe.

Furthermore, the top end of the guide sleeve is provided with a locking screw for locking the dial indicator.

Furthermore, a fixed block is arranged at the top of the guide sleeve, and a plurality of fixed holes on the same distribution circle are symmetrically formed in the fixed block.

Further, the cam shaft device further comprises a V-shaped block which is positioned below the roller and used for supporting the cam shaft.

Compared with the prior art, the utility model discloses the beneficial effect who has does:

(1) the utility model discloses a camshaft cam lift examines utensil utilizes the gyro wheel can realize this examine utensil and the rolling contact of camshaft to reduce the friction between this examine utensil and the camshaft, prevent to scrape colored camshaft, and reduce the shake when the friction of the two rotates, can effectively improve and detect the precision; the coaxial guide shaft and the guide sleeve can transmit the surface shape change of the camshaft to the dial indicator probe, so that the cam lift measurement is realized, and the spring can ensure that the roller is always contacted with the detected surface of the camshaft.

(2) In addition, a limiting screw is arranged at the bottom of the guide sleeve, the inserting position and the sliding direction of the guide shaft in the guide sleeve are limited through the matching of the limiting screw and a limiting groove in the guide shaft, and meanwhile, the accurate measurement of the cam lift of the camshaft is ensured.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

fig. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic diagram of the application structure of the present invention;

fig. 3 is a schematic sectional structure of the present invention;

FIG. 4 is a cross-sectional structural view of the guide shaft of FIG. 1;

in the figure, the dial indicator comprises a dial indicator 1, a dial indicator 2, a guide sleeve 3, a guide shaft 31, a limiting groove 32, an opening 4, a roller 5, a spring 6, a fixing block 61, a fixing hole 7, a limiting screw 8, a locking screw 9, a cam shaft 10, a V-shaped block 11 and a rotating shaft.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the following detailed description, but the present invention is not limited thereto.

Referring to fig. 1 to 4, the utility model discloses an utensil is examined in camshaft cam lift, including percentage table 1, still include coaxial arrangement's guiding axle 3 and uide bushing 2, guiding axle 3 is the shoulder shaft, set up the shoulder hole with 3 looks adaptations of guiding axle in the uide bushing 2, percentage table 1 is fixed at 2 tops of uide bushing, and its probe passes 2 top end openings of uide bushing and links to each other with 3 tops of guiding axle, utilizes the removal that the slip of guiding axle 3 in uide bushing 2 promoted percentage table 1 probe, and then shows camshaft 9 surface shape change in real time on percentage table 1. The guide shaft 3 is inserted into the guide sleeve 2 in a sliding mode, the spring 5 is sleeved on the upper portion of the guide shaft 3, one end of the spring 5 tightly pushes against the stepped surface of the guide shaft 3, the other end of the spring tightly pushes against the stepped surface of the guide sleeve 2, and the guide shaft 3 can be always in a compressed state through the spring 5. The bottom end of the guide shaft 3 is provided with a roller 4 through a rotating shaft 11, the roller 4 can rotate around the rotating shaft 11, and the bottom of the roller 4 is contacted with a cam shaft 9 horizontally arranged on a V-shaped block 10. Utilize gyro wheel 4 can realize with camshaft 9's rolling contact, reduce the resistance that camshaft 9 received at rotatory in-process, prevent to scrape colored camshaft 9 to chatter when reducing the friction rotation of the two. Meanwhile, the roller 4 is always in contact with the detected surface of the camshaft 9 under the action of spring force, and the detection precision of the cam lift of the camshaft 9 is ensured. Still be provided with spacing groove 31 on the guiding axle 3, the length of spacing groove 31 is greater than camshaft 9 cam lift for the displacement of guiding axle 3 in uide bushing 2 is greater than camshaft 9 cam lift, guarantees simultaneously that in the testing process, guiding axle 3 is located uide bushing 2 all the time. The bottom of the guide sleeve 2 is provided with a limit screw 7 matched with the limit groove 31, the penetrating position and the sliding direction of the guide shaft 3 in the guide sleeve 2 can be limited by the cooperation of the limit screw 7 screwed on the guide sleeve 2 and the limit groove 31 on the guide shaft 3, and the cam lift of the camshaft 9 can be accurately measured. The top end of the guide shaft 3 is provided with an opening 32 matched with the bottom end of the probe of the dial indicator 1, so that the coaxiality between the probe of the dial indicator 1 and the guide sleeve 2 can be ensured, and the detection precision is improved. The top of the guide sleeve 2 is provided with a fixing block 6, the fixing block 6 is fixed on a step surface on the periphery of the guide sleeve 2 through a fixing screw, and the horizontal fixing of the checking fixture can be realized by utilizing the fixing block 6.

Preferably, the top end of the guide sleeve 2 is provided with a locking screw 8 for locking the dial indicator 1 so as to fix and disassemble the dial indicator 1. Four fixing holes 61 which are positioned on the same distribution circle are symmetrically formed in the fixing block 6 and used for horizontally fixing the detection tool on the workbench.

When the detection tool is used, the detection tool is divided into an alignment process and a detection process. When adjusting well, should examine a vertical placing, make gyro wheel 4 under the effect of spring 5 with put the camshaft 9 cam contact on V type piece 10, finely tune the horizontal position of examining the utensil relative camshaft 9, find the biggest compression volume point of percentage table 1, examine a vertical center and adjust well with camshaft 9 vertical center promptly. During measurement, the camshaft 9 is rotated, and the maximum variation of the dial indicator 1 is recorded, namely the lift of the molded line of the camshaft 9. This examine utensil can transmit the position variation volume that gyro wheel 4 reciprocated for percentage table 1 through guiding axle 3, be about to the lift volume transmission of camshaft 9 cam for percentage table 1. Simultaneously this examine utensil can realize with camshaft 9 on vertical side adjusting well to on showing percentage table 1 with camshaft 9 surface variation in real time, reduced artifical measuring precision error.

The above description is only for the preferred embodiment of the present invention, and all modifications, equivalents, improvements and the like made within the spirit and scope of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a camshaft cam lift examines utensil, includes percentage table (1), its characterized in that: the device also comprises a guide shaft (3) and a guide sleeve (2) which are coaxially arranged, wherein the guide shaft (3) is a stepped shaft, a stepped hole matched with the guide shaft (3) is arranged in the guide sleeve (2), the dial indicator (1) is fixed in the opening at the top end of the guide sleeve (2) and is connected with the top end of the guide shaft (3), the guide shaft (3) is inserted in the guide sleeve (2) in a sliding way, a spring (5) is sleeved on the upper part of the guide shaft (3), one end of the spring (5) is tightly pressed against the stepped surface of the guide shaft (3), the other end of the spring is tightly pressed against the stepped surface of the guide sleeve (2), the bottom end of the guide shaft (3) is provided with a roller (4), the guide shaft (3) is also provided with a limit groove (31), and a limiting screw (7) matched with the limiting groove (31) is arranged at the bottom of the guide sleeve (2).

2. The utensil is examined in camshaft cam lift of claim 1, characterized by: the length of the limiting groove (31) is larger than the cam lift of the cam shaft (9).

3. The utensil is examined in camshaft cam lift of claim 1, characterized by: the top end of the guide shaft (3) is provided with an opening (32) matched with the bottom end of the probe of the dial indicator (1).

4. The utensil is examined in camshaft cam lift of claim 1, characterized by: and a locking screw (8) used for locking the dial indicator (1) is arranged at the top end of the guide sleeve (2).

5. The utensil is examined in camshaft cam lift of claim 1, characterized by: the top of the guide sleeve (2) is provided with a fixed block (6), and a plurality of fixed holes (61) located on the same distribution circle are symmetrically formed in the fixed block (6).

6. The tool for checking the cam lift of the camshaft according to any one of claims 1 to 5, wherein: and a V-shaped block (10) positioned below the roller (4) and used for supporting the camshaft (9).