1 / 12

HMC Theta 1:25:1 BSM M9 mounting Bolt Investigation

HMC Theta 1:25:1 BSM M9 mounting Bolt Investigation. 28 Nov 2007. Overview.

buck
Download Presentation

HMC Theta 1:25:1 BSM M9 mounting Bolt Investigation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. HMC Theta 1:25:1 BSMM9 mounting Bolt Investigation 28 Nov 2007

  2. Overview • Per the request on 22nd November 2007, Metaldyne has reviewed the impact of changing the engine mounting bolts to a M9 size bolt (Non threaded portion Ø8.16). It is our understanding that this change would be made to all dual pump (1.25:1) BSM’s shipped from Metaldyne Korea. • The M9 bolt design supplied by HMC shows a reduced body style bolt, with the body Ø8.16mm, compared to the current M8 bolt body Ø8.00 – 8.15mm. The washer design supplied by HMC would have an OD of 19.5 ± 0.2mm.

  3. Upper Housing Casting • Use of reduced body thickness bolt (8.16mm Ø on M9 bolt proposed from HMC) means current core pins are OK. • No changes are required to the upper housing casting.

  4. Lower Housing Casting • Use of reduced body thickness bolt (8.16mm Ø on M9 bolt proposed from HMC) means current core pins are OK. • No changes are required to the lower housing casting.

  5. Housing 1 Bolt Towers • Current Hsg 1 design has a weight saving feature on one of the front engine bolt towers – the tower is open. The other tower is closed. • The open bolt boss distorts more than the other 3 engine bolt bosses under current clamp load – a test was carried out for Asan QC. • Metaldyne feel that this open bolt tower should be filled in or strengthened, • See next two slides for test results. (Test carried out October 2005).

  6. Linear region 2% Proof 40 Nm 32 Nm Right Front Bolt Boss – Open Boss 33 KN load beyond plastic deformation

  7. Bolt Tower Deflection Under Compressive Load. The data in the table below was read off the cart on the previous slide. For comparison, under 2800 Kgf load, the other 3 (closed) module bolt towers showed 0.35mm deflection.

  8. Engine Mounting Dowels • Current engine mounting dowel dimensions were specified by HMC. Any design change to them has to also be accommodated in the ladder frame. • Current dowel • ID = 8.40 – 8.80 mm. Would need to increase by 1mm for M9 • OD = 10.890 – 11.000mm. Increase by 1mm to retain wall thickness.

  9. High Pressure Sealing Land - Hsg 1. • By increasing the OD of the engine mounting dowels, the sealing land for the high pressure discharge is reduced, also by 0.5mm. • This will reduce the sealing land to 3.5mm nominally. • 3.25 mm at worst case HMC must determine if this is acceptable.

  10. Line Bore Operation • New process bolts and nuts may be required. • New M9 bolt feeder required in addition to M8 bolt feeder. • Two additional nutrunners (required at assembly and disassembly stations). • MKL to review manufacturing process to make sure that new design would not have any negative effects on the fixturing.

  11. Cost & Timing • Cost, timing and logistics will need to be addressed after the manufacturing review has been completed. • Prototype modules would require sand-cast front housings due to timing of die cast tooling

  12. Rated Engine Speed • Metaldyne is confident that the module construction is capable of the 6600 rpm rated speed because it has been fully validated at this. • Metaldyne will need to review the shaft and bearing designs in much greater detail to determine if the 7150 rpm over speed is possible.

More Related