Timing transmission system structure
By improving the timing drive system structure, adopting sprocket stop positioning and optimizing the cam profile, the problem of integral machining of the positioning pin in the existing technology was solved, thereby achieving cost reduction and performance improvement of the engine.
Patent Information
- Application Number
- CN202520144805.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-21
AI Technical Summary
In the existing engine timing system, the phaser sprocket and the camshaft positioning pin are machined as a single unit, which leads to complicated machining, high scrap rate, high cost, low standardization, and the cam profile is not suitable for the N20TC turbocharged direct injection engine, thus limiting performance improvement.
The phaser sprocket and camshaft are positioned by the sprocket stop, the positioning pin is integrated with the sprocket, the camshaft and sprocket are fastened together by bolts, the camshaft is equipped with eight identical cam groups, the cam profile is optimized, and weight reduction holes are set on the phaser sprocket.
It reduces the machining scrap rate of camshafts, enables the use of multiple engine platforms, reduces costs, improves engine performance by 8%, reduces weight by 20%, and improves engine mechanical efficiency and intake efficiency.
Smart Images
Figure CN223767582U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automobile engines, and in particular to a timing transmission system structure. Background Technology
[0002] The engine timing system uses a chain to drive the phaser sprocket, which in turn drives the camshaft to achieve valve timing. In the existing structure, the phaser sprocket and camshaft are positioned using a camshaft stop, and a locating pin is integrally machined into the end of the camshaft, which is then used for positioning and connection with the phaser sprocket. Because the locating pin is integrally machined with the camshaft, the machining process is cumbersome, resulting in high scrap rates, high costs, and low standardization.
[0003] Furthermore, the cam profile of the camshaft is not suitable for the N20TC turbocharged direct injection engine, and the cam profile needs to be re-optimized to improve performance. Utility Model Content
[0004] The purpose of this invention is to solve the aforementioned problems in the background art and to provide a timing transmission system structure.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0006] A timing drive system structure includes a phaser sprocket, a camshaft, and a locating pin. One end face of the phaser sprocket has a coaxial circular boss with a through hole in the center. The other end face of the phaser sprocket has a locating pin integrally formed therewith, and a locating stop is located in the center of the other end face. One end of the camshaft has a threaded hole in the center and a pin hole. One end of the camshaft is fitted into the locating stop of the phaser sprocket. The phaser sprocket is fastened to the threaded hole of the camshaft by bolts, and the phaser sprocket and camshaft are positioned and connected by a locating pin fitted into the pin hole of the camshaft.
[0007] Furthermore, the camshaft is provided with eight cams, all of which have the same structural shape, and the maximum lift of the cam is t = 38.37 mm.
[0008] Furthermore, the eight cams, from one end of the camshaft to the other, are sequentially named cam one, cam two, cam three, cam four, cam five, cam six, cam seven, and cam eight. The convex ends of cam one and cam two face the same direction, as do the convex ends of cam three and cam four, cam five and cam six, and cam seven and cam eight. Cam one and cam two form cam group one, cam three and cam four form cam group two, and cam five and cam six form... Cam group three, cam seven and cam eight form cam group four. The line connecting the midpoint of the protruding end of cam one to the center of cam one is 180° different from the line connecting the midpoint of the protruding end of cam seven to the center of cam seven. The line connecting the midpoint of the protruding end of cam three to the center of cam three is 180° different from the line connecting the midpoint of the protruding end of cam five to the center of cam five. The line connecting the midpoint of the protruding end of cam one to the center of cam one is 90° different from the line connecting the midpoint of the protruding end of cam three to the center of cam three.
[0009] Furthermore, the diameter of the semicircular portion of the cam 4 is φ = 34 mm, and the cam thickness is w = 12 mm.
[0010] Furthermore, the phaser sprocket 1 is provided with a plurality of weight-reducing holes 5 evenly distributed along the circumference, and the weight-reducing holes are circular in shape.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] 1. In the timing transmission system structure of this utility model, the positioning of the phaser sprocket and the camshaft adopts sprocket stop positioning, and the positioning pin is integrated with the sprocket, which reduces the machining process of the camshaft, reduces the scrap rate, and enables the camshaft design to be shared by multiple machine platforms. The improvement of the overall machine generalization rate can significantly reduce costs.
[0013] 2. The cam profile has been optimized to better suit the performance requirements of the new N20TC platform.
[0014] 3. Multiple weight-reduction holes are evenly distributed along the circumference of the phaser sprocket. This lightweight design reduces the system's rotational inertia and mechanical losses, optimizing engine mechanical efficiency. While ensuring functional design requirements, structural layout requirements, and mechanical strength requirements, it can reduce weight by approximately 20% compared to the original model.
[0015] In summary, the timing drive system structure of this invention possesses good manufacturability and assemblability, while also improving engine intake efficiency. When used in the N20TC turbocharged direct injection engine, the optimized cam profile can improve engine performance (performance indicators improve by approximately 8%). Attached Figure Description
[0016] Figure 1This utility model relates to an isometric view of a timing transmission system structure. Figure 1 ;
[0017] Figure 2 This utility model relates to an isometric view of a timing transmission system structure. Figure 2 ;
[0018] Figure 3 This is a front view of a timing transmission system structure according to this utility model;
[0019] Figure 4 yes Figure 3 The left view;
[0020] Figure 5 yes Figure 3 The right view;
[0021] Figure 6 This is a schematic diagram of the cam structure.
[0022] The component names and reference numerals in the above figures are summarized below:
[0023] Phaser sprocket 1, camshaft 2, locating pin 3, cam 4, weight reduction hole 5, circular boss 6. Detailed Implementation
[0024] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.
[0025] Specific implementation method one: as follows Figures 1-3 As shown, this embodiment describes a timing transmission system structure, including a phaser sprocket 1, a camshaft 2, and a locating pin 3. One end face of the phaser sprocket 1 has a coaxial circular boss 6, with a through hole in the center of the circular boss 6. The other end face of the phaser sprocket 1 has a locating pin 3 integrally formed therewith, and a locating stop is located in the center of the other end face of the phaser sprocket 1. One end of the camshaft 2 has a threaded hole in the center and a pin hole. One end of the camshaft 2 is fitted into the locating stop of the phaser sprocket 1. The phaser sprocket 1 is fastened to the threaded hole of the camshaft 2 by bolts, and the phaser sprocket 1 and the camshaft 2 are positioned and connected by the locating pin 3 fitted into the pin hole of the camshaft 2.
[0026] Specific implementation method two: such as Figure 2 , Figure 3 and Figure 6As shown, this embodiment is a further explanation of the first specific embodiment. The camshaft 2 is provided with eight cams 4. The eight cams 4 have the same structural shape, and the maximum lift of the cam 4 is t = 38.37 mm.
[0027] Specific implementation method three: such as Figure 2 , Figure 3 and Figure 6 As shown, this embodiment is a further explanation of specific embodiment two. The eight cams 4, from one end of the camshaft 2 to the other, are sequentially named cam one, cam two, cam three, cam four, cam five, cam six, cam seven, and cam eight. The convex ends of cam one and cam two are in the same direction, the convex ends of cam three and cam four are in the same direction, the convex ends of cam five and cam six are in the same direction, and the convex ends of cam seven and cam eight are in the same direction. Cam one and cam two form cam group one, and cam three and cam four form cam group two. Second, cam five and cam six form cam group three, and cam seven and cam eight form cam group four. The line connecting the midpoint of the protruding end of cam one to the center of cam one and the line connecting the midpoint of the protruding end of cam seven to the center of cam seven are 180° apart. The line connecting the midpoint of the protruding end of cam three to the center of cam three and the line connecting the midpoint of the protruding end of cam five to the center of cam five are 180° apart. The line connecting the midpoint of the protruding end of cam one to the center of cam one and the line connecting the midpoint of the protruding end of cam three to the center of cam three are 90° apart.
[0028] Specific implementation method four: such as Figure 3 and Figure 6 As shown, this embodiment is a further explanation of specific embodiment one and specific embodiment two. The diameter of the semicircular part of the cam 4 is φ = 34mm and the cam thickness is w = 12mm.
[0029] Specific implementation method five: such as Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, this embodiment is a further explanation of the first specific embodiment. The phaser sprocket 1 is provided with a plurality of weight reduction holes 5 evenly distributed along the circumference. The weight reduction holes 5 are circular in shape.
[0030] In use, the timing transmission system structure of this utility model is arranged inside the cylinder head valve chamber cover.
[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A timing drive system architecture, characterized by: It includes phase chain wheel (1), camshaft (2) and positioning pin (3), one side end face of phase chain wheel (1) is equipped with coaxial circular boss (6), middle part of circular boss (6) of phase chain wheel (1) is equipped with through hole, the other side end face of phase chain wheel (1) is equipped with positioning pin (3) made as a whole, middle part of the other side end face of phase chain wheel (1) is equipped with positioning stop; Middle part of one end of camshaft (2) is equipped with screw hole, the one end of camshaft (2) is equipped with pin hole; One end of camshaft (2) is matched and installed in the positioning stop of phase chain wheel (1), phase chain wheel (1) is fastened and connected with the screw hole of camshaft (2) through bolt, phase chain wheel (1) and camshaft (2) are positioned and connected through the positioning pin (3) matched and inserted in the pin hole of camshaft (2).
2. A timing drive system arrangement according to claim 1, characterised in that: Eight cams (4) are arranged on the camshaft (2), and the eight cams (4) are identical in structure and shape, and the maximum lift of the cam (4) is t=38.37mm.
3. A timing drive system arrangement according to claim 2, characterised in that: The eight cams (4) are sequentially arranged from one end to the other end of the camshaft (2) as cam one, cam two, cam three, cam four, cam five, cam six, cam seven and cam eight, the protruding end directions of the cam one and the cam two are consistent, the protruding end directions of the cam three and the cam four are consistent, the protruding end directions of the cam five and the cam six are consistent, and the protruding end directions of the cam seven and the cam eight are consistent; The cam one and the cam two form a cam group one, the cam three and the cam four form a cam group two, the cam five and the cam six form a cam group three, the cam seven and the cam eight form a cam group four, the connecting line between the protruding end middle point of the cam one and the center of the cam one is different from the connecting line between the protruding end middle point of the cam seven and the center of the cam seven by 180°, the connecting line between the protruding end middle point of the cam three and the center of the cam three is different from the connecting line between the protruding end middle point of the cam five and the center of the cam five by 180°, and the connecting line between the protruding end middle point of the cam one and the center of the cam one is different from the connecting line between the protruding end middle point of the cam three and the center of the cam three by 90°.
4. A timing drive system arrangement according to claim 1 or 2, characterised in that: The diameter of the semicircular part of the cam (4) is φ=34mm, and the thickness of the cam is w=12mm.
5. The timing drive system structure of claim 1, wherein: A plurality of lightening holes (5) are arranged on the phase chain wheel (1) along the circumference.